| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> |
| * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved. |
| * |
| * Authors: |
| * Paul Mackerras <paulus@au1.ibm.com> |
| * Alexander Graf <agraf@suse.de> |
| * Kevin Wolf <mail@kevin-wolf.de> |
| * |
| * Description: KVM functions specific to running on Book 3S |
| * processors in hypervisor mode (specifically POWER7 and later). |
| * |
| * This file is derived from arch/powerpc/kvm/book3s.c, |
| * by Alexander Graf <agraf@suse.de>. |
| */ |
| |
| #include <linux/kvm_host.h> |
| #include <linux/kernel.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/preempt.h> |
| #include <linux/sched/signal.h> |
| #include <linux/sched/stat.h> |
| #include <linux/delay.h> |
| #include <linux/export.h> |
| #include <linux/fs.h> |
| #include <linux/anon_inodes.h> |
| #include <linux/cpu.h> |
| #include <linux/cpumask.h> |
| #include <linux/spinlock.h> |
| #include <linux/page-flags.h> |
| #include <linux/srcu.h> |
| #include <linux/miscdevice.h> |
| #include <linux/debugfs.h> |
| #include <linux/gfp.h> |
| #include <linux/vmalloc.h> |
| #include <linux/highmem.h> |
| #include <linux/hugetlb.h> |
| #include <linux/kvm_irqfd.h> |
| #include <linux/irqbypass.h> |
| #include <linux/module.h> |
| #include <linux/compiler.h> |
| #include <linux/of.h> |
| |
| #include <asm/ftrace.h> |
| #include <asm/reg.h> |
| #include <asm/ppc-opcode.h> |
| #include <asm/asm-prototypes.h> |
| #include <asm/archrandom.h> |
| #include <asm/debug.h> |
| #include <asm/disassemble.h> |
| #include <asm/cputable.h> |
| #include <asm/cacheflush.h> |
| #include <linux/uaccess.h> |
| #include <asm/interrupt.h> |
| #include <asm/io.h> |
| #include <asm/kvm_ppc.h> |
| #include <asm/kvm_book3s.h> |
| #include <asm/mmu_context.h> |
| #include <asm/lppaca.h> |
| #include <asm/pmc.h> |
| #include <asm/processor.h> |
| #include <asm/cputhreads.h> |
| #include <asm/page.h> |
| #include <asm/hvcall.h> |
| #include <asm/switch_to.h> |
| #include <asm/smp.h> |
| #include <asm/dbell.h> |
| #include <asm/hmi.h> |
| #include <asm/pnv-pci.h> |
| #include <asm/mmu.h> |
| #include <asm/opal.h> |
| #include <asm/xics.h> |
| #include <asm/xive.h> |
| #include <asm/hw_breakpoint.h> |
| #include <asm/kvm_book3s_uvmem.h> |
| #include <asm/ultravisor.h> |
| #include <asm/dtl.h> |
| #include <asm/plpar_wrappers.h> |
| |
| #include "book3s.h" |
| |
| #define CREATE_TRACE_POINTS |
| #include "trace_hv.h" |
| |
| /* #define EXIT_DEBUG */ |
| /* #define EXIT_DEBUG_SIMPLE */ |
| /* #define EXIT_DEBUG_INT */ |
| |
| /* Used to indicate that a guest page fault needs to be handled */ |
| #define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1) |
| /* Used to indicate that a guest passthrough interrupt needs to be handled */ |
| #define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2) |
| |
| /* Used as a "null" value for timebase values */ |
| #define TB_NIL (~(u64)0) |
| |
| static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1); |
| |
| static int dynamic_mt_modes = 6; |
| module_param(dynamic_mt_modes, int, 0644); |
| MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)"); |
| static int target_smt_mode; |
| module_param(target_smt_mode, int, 0644); |
| MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)"); |
| |
| static bool one_vm_per_core; |
| module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires POWER8 or older)"); |
| |
| #ifdef CONFIG_KVM_XICS |
| static const struct kernel_param_ops module_param_ops = { |
| .set = param_set_int, |
| .get = param_get_int, |
| }; |
| |
| module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644); |
| MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization"); |
| |
| module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644); |
| MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core"); |
| #endif |
| |
| /* If set, guests are allowed to create and control nested guests */ |
| static bool nested = true; |
| module_param(nested, bool, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)"); |
| |
| static inline bool nesting_enabled(struct kvm *kvm) |
| { |
| return kvm->arch.nested_enable && kvm_is_radix(kvm); |
| } |
| |
| static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu); |
| |
| /* |
| * RWMR values for POWER8. These control the rate at which PURR |
| * and SPURR count and should be set according to the number of |
| * online threads in the vcore being run. |
| */ |
| #define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL |
| #define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL |
| #define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL |
| #define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL |
| #define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL |
| #define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL |
| #define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL |
| #define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL |
| |
| static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = { |
| RWMR_RPA_P8_1THREAD, |
| RWMR_RPA_P8_1THREAD, |
| RWMR_RPA_P8_2THREAD, |
| RWMR_RPA_P8_3THREAD, |
| RWMR_RPA_P8_4THREAD, |
| RWMR_RPA_P8_5THREAD, |
| RWMR_RPA_P8_6THREAD, |
| RWMR_RPA_P8_7THREAD, |
| RWMR_RPA_P8_8THREAD, |
| }; |
| |
| static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc, |
| int *ip) |
| { |
| int i = *ip; |
| struct kvm_vcpu *vcpu; |
| |
| while (++i < MAX_SMT_THREADS) { |
| vcpu = READ_ONCE(vc->runnable_threads[i]); |
| if (vcpu) { |
| *ip = i; |
| return vcpu; |
| } |
| } |
| return NULL; |
| } |
| |
| /* Used to traverse the list of runnable threads for a given vcore */ |
| #define for_each_runnable_thread(i, vcpu, vc) \ |
| for (i = -1; (vcpu = next_runnable_thread(vc, &i)); ) |
| |
| static bool kvmppc_ipi_thread(int cpu) |
| { |
| unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); |
| |
| /* If we're a nested hypervisor, fall back to ordinary IPIs for now */ |
| if (kvmhv_on_pseries()) |
| return false; |
| |
| /* On POWER9 we can use msgsnd to IPI any cpu */ |
| if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
| msg |= get_hard_smp_processor_id(cpu); |
| smp_mb(); |
| __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); |
| return true; |
| } |
| |
| /* On POWER8 for IPIs to threads in the same core, use msgsnd */ |
| if (cpu_has_feature(CPU_FTR_ARCH_207S)) { |
| preempt_disable(); |
| if (cpu_first_thread_sibling(cpu) == |
| cpu_first_thread_sibling(smp_processor_id())) { |
| msg |= cpu_thread_in_core(cpu); |
| smp_mb(); |
| __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); |
| preempt_enable(); |
| return true; |
| } |
| preempt_enable(); |
| } |
| |
| #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP) |
| if (cpu >= 0 && cpu < nr_cpu_ids) { |
| if (paca_ptrs[cpu]->kvm_hstate.xics_phys) { |
| xics_wake_cpu(cpu); |
| return true; |
| } |
| opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY); |
| return true; |
| } |
| #endif |
| |
| return false; |
| } |
| |
| static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu) |
| { |
| int cpu; |
| struct rcuwait *waitp; |
| |
| waitp = kvm_arch_vcpu_get_wait(vcpu); |
| if (rcuwait_wake_up(waitp)) |
| ++vcpu->stat.generic.halt_wakeup; |
| |
| cpu = READ_ONCE(vcpu->arch.thread_cpu); |
| if (cpu >= 0 && kvmppc_ipi_thread(cpu)) |
| return; |
| |
| /* CPU points to the first thread of the core */ |
| cpu = vcpu->cpu; |
| if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu)) |
| smp_send_reschedule(cpu); |
| } |
| |
| /* |
| * We use the vcpu_load/put functions to measure stolen time. |
| * Stolen time is counted as time when either the vcpu is able to |
| * run as part of a virtual core, but the task running the vcore |
| * is preempted or sleeping, or when the vcpu needs something done |
| * in the kernel by the task running the vcpu, but that task is |
| * preempted or sleeping. Those two things have to be counted |
| * separately, since one of the vcpu tasks will take on the job |
| * of running the core, and the other vcpu tasks in the vcore will |
| * sleep waiting for it to do that, but that sleep shouldn't count |
| * as stolen time. |
| * |
| * Hence we accumulate stolen time when the vcpu can run as part of |
| * a vcore using vc->stolen_tb, and the stolen time when the vcpu |
| * needs its task to do other things in the kernel (for example, |
| * service a page fault) in busy_stolen. We don't accumulate |
| * stolen time for a vcore when it is inactive, or for a vcpu |
| * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of |
| * a misnomer; it means that the vcpu task is not executing in |
| * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in |
| * the kernel. We don't have any way of dividing up that time |
| * between time that the vcpu is genuinely stopped, time that |
| * the task is actively working on behalf of the vcpu, and time |
| * that the task is preempted, so we don't count any of it as |
| * stolen. |
| * |
| * Updates to busy_stolen are protected by arch.tbacct_lock; |
| * updates to vc->stolen_tb are protected by the vcore->stoltb_lock |
| * lock. The stolen times are measured in units of timebase ticks. |
| * (Note that the != TB_NIL checks below are purely defensive; |
| * they should never fail.) |
| */ |
| |
| static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&vc->stoltb_lock, flags); |
| vc->preempt_tb = mftb(); |
| spin_unlock_irqrestore(&vc->stoltb_lock, flags); |
| } |
| |
| static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&vc->stoltb_lock, flags); |
| if (vc->preempt_tb != TB_NIL) { |
| vc->stolen_tb += mftb() - vc->preempt_tb; |
| vc->preempt_tb = TB_NIL; |
| } |
| spin_unlock_irqrestore(&vc->stoltb_lock, flags); |
| } |
| |
| static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu) |
| { |
| struct kvmppc_vcore *vc = vcpu->arch.vcore; |
| unsigned long flags; |
| |
| /* |
| * We can test vc->runner without taking the vcore lock, |
| * because only this task ever sets vc->runner to this |
| * vcpu, and once it is set to this vcpu, only this task |
| * ever sets it to NULL. |
| */ |
| if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) |
| kvmppc_core_end_stolen(vc); |
| |
| spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); |
| if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST && |
| vcpu->arch.busy_preempt != TB_NIL) { |
| vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt; |
| vcpu->arch.busy_preempt = TB_NIL; |
| } |
| spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); |
| } |
| |
| static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu) |
| { |
| struct kvmppc_vcore *vc = vcpu->arch.vcore; |
| unsigned long flags; |
| |
| if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) |
| kvmppc_core_start_stolen(vc); |
| |
| spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); |
| if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) |
| vcpu->arch.busy_preempt = mftb(); |
| spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); |
| } |
| |
| static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr) |
| { |
| vcpu->arch.pvr = pvr; |
| } |
| |
| /* Dummy value used in computing PCR value below */ |
| #define PCR_ARCH_31 (PCR_ARCH_300 << 1) |
| |
| static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) |
| { |
| unsigned long host_pcr_bit = 0, guest_pcr_bit = 0; |
| struct kvmppc_vcore *vc = vcpu->arch.vcore; |
| |
| /* We can (emulate) our own architecture version and anything older */ |
| if (cpu_has_feature(CPU_FTR_ARCH_31)) |
| host_pcr_bit = PCR_ARCH_31; |
| else if (cpu_has_feature(CPU_FTR_ARCH_300)) |
| host_pcr_bit = PCR_ARCH_300; |
| else if (cpu_has_feature(CPU_FTR_ARCH_207S)) |
| host_pcr_bit = PCR_ARCH_207; |
| else if (cpu_has_feature(CPU_FTR_ARCH_206)) |
| host_pcr_bit = PCR_ARCH_206; |
| else |
| host_pcr_bit = PCR_ARCH_205; |
| |
| /* Determine lowest PCR bit needed to run guest in given PVR level */ |
| guest_pcr_bit = host_pcr_bit; |
| if (arch_compat) { |
| switch (arch_compat) { |
| case PVR_ARCH_205: |
| guest_pcr_bit = PCR_ARCH_205; |
| break; |
| case PVR_ARCH_206: |
| case PVR_ARCH_206p: |
| guest_pcr_bit = PCR_ARCH_206; |
| break; |
| case PVR_ARCH_207: |
| guest_pcr_bit = PCR_ARCH_207; |
| break; |
| case PVR_ARCH_300: |
| guest_pcr_bit = PCR_ARCH_300; |
| break; |
| case PVR_ARCH_31: |
| guest_pcr_bit = PCR_ARCH_31; |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| /* Check requested PCR bits don't exceed our capabilities */ |
| if (guest_pcr_bit > host_pcr_bit) |
| return -EINVAL; |
| |
| spin_lock(&vc->lock); |
| vc->arch_compat = arch_compat; |
| /* |
| * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit |
| * Also set all reserved PCR bits |
| */ |
| vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK; |
| spin_unlock(&vc->lock); |
| |
| return 0; |
| } |
| |
| static void kvmppc_dump_regs(struct kvm_vcpu *vcpu) |
| { |
| int r; |
| |
| pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id); |
| pr_err("pc = %.16lx msr = %.16llx trap = %x\n", |
| vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap); |
| for (r = 0; r < 16; ++r) |
| pr_err("r%2d = %.16lx r%d = %.16lx\n", |
| r, kvmppc_get_gpr(vcpu, r), |
| r+16, kvmppc_get_gpr(vcpu, r+16)); |
| pr_err("ctr = %.16lx lr = %.16lx\n", |
| vcpu->arch.regs.ctr, vcpu->arch.regs.link); |
| pr_err("srr0 = %.16llx srr1 = %.16llx\n", |
| vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1); |
| pr_err("sprg0 = %.16llx sprg1 = %.16llx\n", |
| vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1); |
| pr_err("sprg2 = %.16llx sprg3 = %.16llx\n", |
| vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3); |
| pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n", |
| vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr); |
| pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar); |
| pr_err("fault dar = %.16lx dsisr = %.8x\n", |
| vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); |
| pr_err("SLB (%d entries):\n", vcpu->arch.slb_max); |
| for (r = 0; r < vcpu->arch.slb_max; ++r) |
| pr_err(" ESID = %.16llx VSID = %.16llx\n", |
| vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv); |
| pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n", |
| vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1, |
| vcpu->arch.last_inst); |
| } |
| |
| static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id) |
| { |
| return kvm_get_vcpu_by_id(kvm, id); |
| } |
| |
| static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa) |
| { |
| vpa->__old_status |= LPPACA_OLD_SHARED_PROC; |
| vpa->yield_count = cpu_to_be32(1); |
| } |
| |
| static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v, |
| unsigned long addr, unsigned long len) |
| { |
| /* check address is cacheline aligned */ |
| if (addr & (L1_CACHE_BYTES - 1)) |
| return -EINVAL; |
| spin_lock(&vcpu->arch.vpa_update_lock); |
| if (v->next_gpa != addr || v->len != len) { |
| v->next_gpa = addr; |
| v->len = addr ? len : 0; |
| v->update_pending = 1; |
| } |
| spin_unlock(&vcpu->arch.vpa_update_lock); |
| return 0; |
| } |
| |
| /* Length for a per-processor buffer is passed in at offset 4 in the buffer */ |
| struct reg_vpa { |
| u32 dummy; |
| union { |
| __be16 hword; |
| __be32 word; |
| } length; |
| }; |
| |
| static int vpa_is_registered(struct kvmppc_vpa *vpap) |
| { |
| if (vpap->update_pending) |
| return vpap->next_gpa != 0; |
| return vpap->pinned_addr != NULL; |
| } |
| |
| static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, |
| unsigned long flags, |
| unsigned long vcpuid, unsigned long vpa) |
| { |
| struct kvm *kvm = vcpu->kvm; |
| unsigned long len, nb; |
| void *va; |
| struct kvm_vcpu *tvcpu; |
| int err; |
| int subfunc; |
| struct kvmppc_vpa *vpap; |
| |
| tvcpu = kvmppc_find_vcpu(kvm, vcpuid); |
| if (!tvcpu) |
| return H_PARAMETER; |
| |
| subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK; |
| if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL || |
| subfunc == H_VPA_REG_SLB) { |
| /* Registering new area - address must be cache-line aligned */ |
| if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa) |
| return H_PARAMETER; |
| |
| /* convert logical addr to kernel addr and read length */ |
| va = kvmppc_pin_guest_page(kvm, vpa, &nb); |
| if (va == NULL) |
| return H_PARAMETER; |
| if (subfunc == H_VPA_REG_VPA) |
| len = be16_to_cpu(((struct reg_vpa *)va)->length.hword); |
| else |
| len = be32_to_cpu(((struct reg_vpa *)va)->length.word); |
| kvmppc_unpin_guest_page(kvm, va, vpa, false); |
| |
| /* Check length */ |
| if (len > nb || len < sizeof(struct reg_vpa)) |
| return H_PARAMETER; |
| } else { |
| vpa = 0; |
| len = 0; |
| } |
| |
| err = H_PARAMETER; |
| vpap = NULL; |
| spin_lock(&tvcpu->arch.vpa_update_lock); |
| |
| switch (subfunc) { |
| case H_VPA_REG_VPA: /* register VPA */ |
| /* |
| * The size of our lppaca is 1kB because of the way we align |
| * it for the guest to avoid crossing a 4kB boundary. We only |
| * use 640 bytes of the structure though, so we should accept |
| * clients that set a size of 640. |
| */ |
| BUILD_BUG_ON(sizeof(struct lppaca) != 640); |
| if (len < sizeof(struct lppaca)) |
| break; |
| vpap = &tvcpu->arch.vpa; |
| err = 0; |
| break; |
| |
| case H_VPA_REG_DTL: /* register DTL */ |
| if (len < sizeof(struct dtl_entry)) |
| break; |
| len -= len % sizeof(struct dtl_entry); |
| |
| /* Check that they have previously registered a VPA */ |
| err = H_RESOURCE; |
| if (!vpa_is_registered(&tvcpu->arch.vpa)) |
| break; |
| |
| vpap = &tvcpu->arch.dtl; |
| err = 0; |
| break; |
| |
| case H_VPA_REG_SLB: /* register SLB shadow buffer */ |
| /* Check that they have previously registered a VPA */ |
| err = H_RESOURCE; |
| if (!vpa_is_registered(&tvcpu->arch.vpa)) |
| break; |
| |
| vpap = &tvcpu->arch.slb_shadow; |
| err = 0; |
| break; |
| |
| case H_VPA_DEREG_VPA: /* deregister VPA */ |
| /* Check they don't still have a DTL or SLB buf registered */ |
| err = H_RESOURCE; |
| if (vpa_is_registered(&tvcpu->arch.dtl) || |
| vpa_is_registered(&tvcpu->arch.slb_shadow)) |
| break; |
| |
| vpap = &tvcpu->arch.vpa; |
| err = 0; |
| break; |
| |
| case H_VPA_DEREG_DTL: /* deregister DTL */ |
| vpap = &tvcpu->arch.dtl; |
| err = 0; |
| break; |
| |
| case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */ |
| vpap = &tvcpu->arch.slb_shadow; |
| err = 0; |
| break; |
| } |
| |
| if (vpap) { |
| vpap->next_gpa = vpa; |
| vpap->len = len; |
| vpap->update_pending = 1; |
| } |
| |
| spin_unlock(&tvcpu->arch.vpa_update_lock); |
| |
| return err; |
| } |
| |
| static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap) |
| { |
| struct kvm *kvm = vcpu->kvm; |
| void *va; |
| unsigned long nb; |
| unsigned long gpa; |
| |
| /* |
| * We need to pin the page pointed to by vpap->next_gpa, |
| * but we can't call kvmppc_pin_guest_page under the lock |
| * as it does get_user_pages() and down_read(). So we |
| * have to drop the lock, pin the page, then get the lock |
| * again and check that a new area didn't get registered |
| * in the meantime. |
| */ |
| for (;;) { |
| gpa = vpap->next_gpa; |
| spin_unlock(&vcpu->arch.vpa_update_lock); |
| va = NULL; |
| nb = 0; |
| if (gpa) |
| va = kvmppc_pin_guest_page(kvm, gpa, &nb); |
| spin_lock(&vcpu->arch.vpa_update_lock); |
| if (gpa == vpap->next_gpa) |
| break; |
| /* sigh... unpin that one and try again */ |
| if (va) |
| kvmppc_unpin_guest_page(kvm, va, gpa, false); |
| } |
| |
| vpap->update_pending = 0; |
| if (va && nb < vpap->len) { |
| /* |
| * If it's now too short, it must be that userspace |
| * has changed the mappings underlying guest memory, |
| * so unregister the region. |
| */ |
| kvmppc_unpin_guest_page(kvm, va, gpa, false); |
| va = NULL; |
| } |
| if (vpap->pinned_addr) |
| kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa, |
| vpap->dirty); |
| vpap->gpa = gpa; |
| vpap->pinned_addr = va; |
| vpap->dirty = false; |
| if (va) |
| vpap->pinned_end = va + vpap->len; |
| } |
| |
| static void kvmppc_update_vpas(struct kvm_vcpu *vcpu) |
| { |
| if (!(vcpu->arch.vpa.update_pending || |
| vcpu->arch.slb_shadow.update_pending || |
| vcpu->arch.dtl.update_pending)) |
| return; |
| |
| spin_lock(&vcpu->arch.vpa_update_lock); |
| if (vcpu->arch.vpa.update_pending) { |
| kvmppc_update_vpa(vcpu, &vcpu->arch.vpa); |
| if (vcpu->arch.vpa.pinned_addr) |
| init_vpa(vcpu, vcpu->arch.vpa.pinned_addr); |
| } |
| if (vcpu->arch.dtl.update_pending) { |
| kvmppc_update_vpa(vcpu, &vcpu->arch.dtl); |
| vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr; |
| vcpu->arch.dtl_index = 0; |
| } |
| if (vcpu->arch.slb_shadow.update_pending) |
| kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow); |
| spin_unlock(&vcpu->arch.vpa_update_lock); |
| } |
| |
| /* |
| * Return the accumulated stolen time for the vcore up until `now'. |
| * The caller should hold the vcore lock. |
| */ |
| static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now) |
| { |
| u64 p; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&vc->stoltb_lock, flags); |
| p = vc->stolen_tb; |
| if (vc->vcore_state != VCORE_INACTIVE && |
| vc->preempt_tb != TB_NIL) |
| p += now - vc->preempt_tb; |
| spin_unlock_irqrestore(&vc->stoltb_lock, flags); |
| return p; |
| } |
| |
| static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, |
| struct kvmppc_vcore *vc) |
| { |
| struct dtl_entry *dt; |
| struct lppaca *vpa; |
| unsigned long stolen; |
| unsigned long core_stolen; |
| u64 now; |
| unsigned long flags; |
| |
| dt = vcpu->arch.dtl_ptr; |
| vpa = vcpu->arch.vpa.pinned_addr; |
| now = mftb(); |
| core_stolen = vcore_stolen_time(vc, now); |
| stolen = core_stolen - vcpu->arch.stolen_logged; |
| vcpu->arch.stolen_logged = core_stolen; |
| spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); |
| stolen += vcpu->arch.busy_stolen; |
| vcpu->arch.busy_stolen = 0; |
| spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); |
| if (!dt || !vpa) |
| return; |
| memset(dt, 0, sizeof(struct dtl_entry)); |
| dt->dispatch_reason = 7; |
| dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid); |
| dt->timebase = cpu_to_be64(now + vc->tb_offset); |
| dt->enqueue_to_dispatch_time = cpu_to_be32(stolen); |
| dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu)); |
| dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr); |
| ++dt; |
| if (dt == vcpu->arch.dtl.pinned_end) |
| dt = vcpu->arch.dtl.pinned_addr; |
| vcpu->arch.dtl_ptr = dt; |
| /* order writing *dt vs. writing vpa->dtl_idx */ |
| smp_wmb(); |
| vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index); |
| vcpu->arch.dtl.dirty = true; |
| } |
| |
| /* See if there is a doorbell interrupt pending for a vcpu */ |
| static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu) |
| { |
| int thr; |
| struct kvmppc_vcore *vc; |
| |
| if (vcpu->arch.doorbell_request) |
| return true; |
| /* |
| * Ensure that the read of vcore->dpdes comes after the read |
| * of vcpu->doorbell_request. This barrier matches the |
| * smp_wmb() in kvmppc_guest_entry_inject(). |
| */ |
| smp_rmb(); |
| vc = vcpu->arch.vcore; |
| thr = vcpu->vcpu_id - vc->first_vcpuid; |
| return !!(vc->dpdes & (1 << thr)); |
| } |
| |
| static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu) |
| { |
| if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207) |
| return true; |
| if ((!vcpu->arch.vcore->arch_compat) && |
| cpu_has_feature(CPU_FTR_ARCH_207S)) |
| return true; |
| return false; |
| } |
| |
| static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags, |
| unsigned long resource, unsigned long value1, |
| unsigned long value2) |
| { |
| switch (resource) { |
| case H_SET_MODE_RESOURCE_SET_CIABR: |
| if (!kvmppc_power8_compatible(vcpu)) |
| return H_P2; |
| if (value2) |
| return H_P4; |
| if (mflags) |
| return H_UNSUPPORTED_FLAG_START; |
| /* Guests can't breakpoint the hypervisor */ |
| if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER) |
| return H_P3; |
| vcpu->arch.ciabr = value1; |
| return H_SUCCESS; |
| case H_SET_MODE_RESOURCE_SET_DAWR0: |
| if (!kvmppc_power8_compatible(vcpu)) |
| return H_P2; |
| if (!ppc_breakpoint_available()) |
| return H_P2; |
| if (mflags) |
| return H_UNSUPPORTED_FLAG_START; |
| if (value2 & DABRX_HYP) |
| return H_P4; |
| vcpu->arch.dawr0 = value1; |
| vcpu->arch.dawrx0 = value2; |
| return H_SUCCESS; |
| case H_SET_MODE_RESOURCE_SET_DAWR1: |
| if (!kvmppc_power8_compatible(vcpu)) |
| return H_P2; |
| if (!ppc_breakpoint_available()) |
| return H_P2; |
| if (!cpu_has_feature(CPU_FTR_DAWR1)) |
| return H_P2; |
| if (!vcpu->kvm->arch.dawr1_enabled) |
| return H_FUNCTION; |
| if (mflags) |
| return H_UNSUPPORTED_FLAG_START; |
| if (value2 & DABRX_HYP) |
| return H_P4; |
| vcpu->arch.dawr1 = value1; |
| vcpu->arch.dawrx1 = value2; |
| return H_SUCCESS; |
| case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE: |
| /* |
| * KVM does not support mflags=2 (AIL=2) and AIL=1 is reserved. |
| * Keep this in synch with kvmppc_filter_guest_lpcr_hv. |
| */ |
| if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) && |
| kvmhv_vcpu_is_radix(vcpu) && mflags == 3) |
| return H_UNSUPPORTED_FLAG_START; |
| return H_TOO_HARD; |
| default: |
| return H_TOO_HARD; |
| } |
| } |
| |
| /* Copy guest memory in place - must reside within a single memslot */ |
| static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from, |
| unsigned long len) |
| { |
| struct kvm_memory_slot *to_memslot = NULL; |
| struct kvm_memory_slot *from_memslot = NULL; |
| unsigned long to_addr, from_addr; |
| int r; |
| |
| /* Get HPA for from address */ |
| from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT); |
| if (!from_memslot) |
| return -EFAULT; |
| if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages) |
| << PAGE_SHIFT)) |
| return -EINVAL; |
| from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT); |
| if (kvm_is_error_hva(from_addr)) |
| return -EFAULT; |
| from_addr |= (from & (PAGE_SIZE - 1)); |
| |
| /* Get HPA for to address */ |
| to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT); |
| if (!to_memslot) |
| return -EFAULT; |
| if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages) |
| << PAGE_SHIFT)) |
| return -EINVAL; |
| to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT); |
| if (kvm_is_error_hva(to_addr)) |
| return -EFAULT; |
| to_addr |= (to & (PAGE_SIZE - 1)); |
| |
| /* Perform copy */ |
| r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr, |
| len); |
| if (r) |
| return -EFAULT; |
| mark_page_dirty(kvm, to >> PAGE_SHIFT); |
| return 0; |
| } |
| |
| static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags, |
| unsigned long dest, unsigned long src) |
| { |
| u64 pg_sz = SZ_4K; /* 4K page size */ |
| u64 pg_mask = SZ_4K - 1; |
| int ret; |
| |
| /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */ |
| if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE | |
| H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED)) |
| return H_PARAMETER; |
| |
| /* dest (and src if copy_page flag set) must be page aligned */ |
| if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask))) |
| return H_PARAMETER; |
| |
| /* zero and/or copy the page as determined by the flags */ |
| if (flags & H_COPY_PAGE) { |
| ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz); |
| if (ret < 0) |
| return H_PARAMETER; |
| } else if (flags & H_ZERO_PAGE) { |
| ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz); |
| if (ret < 0) |
| return H_PARAMETER; |
| } |
| |
| /* We can ignore the remaining flags */ |
| |
| return H_SUCCESS; |
| } |
| |
| static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target) |
| { |
| struct kvmppc_vcore *vcore = target->arch.vcore; |
| |
| /* |
| * We expect to have been called by the real mode handler |
| * (kvmppc_rm_h_confer()) which would have directly returned |
| * H_SUCCESS if the source vcore wasn't idle (e.g. if it may |
| * have useful work to do and should not confer) so we don't |
| * recheck that here. |
| * |
| * In the case of the P9 single vcpu per vcore case, the real |
| * mode handler is not called but no other threads are in the |
| * source vcore. |
| */ |
| |
| spin_lock(&vcore->lock); |
| if (target->arch.state == KVMPPC_VCPU_RUNNABLE && |
| vcore->vcore_state != VCORE_INACTIVE && |
| vcore->runner) |
| target = vcore->runner; |
| spin_unlock(&vcore->lock); |
| |
| return kvm_vcpu_yield_to(target); |
| } |
| |
| static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) |
| { |
| int yield_count = 0; |
| struct lppaca *lppaca; |
| |
| spin_lock(&vcpu->arch.vpa_update_lock); |
| lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr; |
| if (lppaca) |
| yield_count = be32_to_cpu(lppaca->yield_count); |
| spin_unlock(&vcpu->arch.vpa_update_lock); |
| return yield_count; |
| } |
| |
| /* |
| * H_RPT_INVALIDATE hcall handler for nested guests. |
| * |
| * Handles only nested process-scoped invalidation requests in L0. |
| */ |
| static int kvmppc_nested_h_rpt_invalidate(struct kvm_vcpu *vcpu) |
| { |
| unsigned long type = kvmppc_get_gpr(vcpu, 6); |
| unsigned long pid, pg_sizes, start, end; |
| |
| /* |
| * The partition-scoped invalidations aren't handled here in L0. |
| */ |
| if (type & H_RPTI_TYPE_NESTED) |
| return RESUME_HOST; |
| |
| pid = kvmppc_get_gpr(vcpu, 4); |
| pg_sizes = kvmppc_get_gpr(vcpu, 7); |
| start = kvmppc_get_gpr(vcpu, 8); |
| end = kvmppc_get_gpr(vcpu, 9); |
| |
| do_h_rpt_invalidate_prt(pid, vcpu->arch.nested->shadow_lpid, |
| type, pg_sizes, start, end); |
| |
| kvmppc_set_gpr(vcpu, 3, H_SUCCESS); |
| return RESUME_GUEST; |
| } |
| |
| static long kvmppc_h_rpt_invalidate(struct kvm_vcpu *vcpu, |
| unsigned long id, unsigned long target, |
| unsigned long type, unsigned long pg_sizes, |
| unsigned long start, unsigned long end) |
| { |
| if (!kvm_is_radix(vcpu->kvm)) |
| return H_UNSUPPORTED; |
| |
| if (end < start) |
| return H_P5; |
| |
| /* |
| * Partition-scoped invalidation for nested guests. |
| */ |
| if (type & H_RPTI_TYPE_NESTED) { |
| if (!nesting_enabled(vcpu->kvm)) |
| return H_FUNCTION; |
| |
| /* Support only cores as target */ |
| if (target != H_RPTI_TARGET_CMMU) |
| return H_P2; |
| |
| return do_h_rpt_invalidate_pat(vcpu, id, type, pg_sizes, |
| start, end); |
| } |
| |
| /* |
| * Process-scoped invalidation for L1 guests. |
| */ |
| do_h_rpt_invalidate_prt(id, vcpu->kvm->arch.lpid, |
| type, pg_sizes, start, end); |
| return H_SUCCESS; |
| } |
| |
| int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) |
| { |
| struct kvm *kvm = vcpu->kvm; |
| unsigned long req = kvmppc_get_gpr(vcpu, 3); |
| unsigned long target, ret = H_SUCCESS; |
| int yield_count; |
| struct kvm_vcpu *tvcpu; |
| int idx, rc; |
| |
| if (req <= MAX_HCALL_OPCODE && |
| !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls)) |
| return RESUME_HOST; |
| |
| switch (req) { |
| case H_REMOVE: |
| ret = kvmppc_h_remove(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_ENTER: |
| ret = kvmppc_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6), |
| kvmppc_get_gpr(vcpu, 7)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_READ: |
| ret = kvmppc_h_read(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_CLEAR_MOD: |
| ret = kvmppc_h_clear_mod(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_CLEAR_REF: |
| ret = kvmppc_h_clear_ref(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_PROTECT: |
| ret = kvmppc_h_protect(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_BULK_REMOVE: |
| ret = kvmppc_h_bulk_remove(vcpu); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| |
| case H_CEDE: |
| break; |
| case H_PROD: |
| target = kvmppc_get_gpr(vcpu, 4); |
| tvcpu = kvmppc_find_vcpu(kvm, target); |
| if (!tvcpu) { |
| ret = H_PARAMETER; |
| break; |
| } |
| tvcpu->arch.prodded = 1; |
| smp_mb(); |
| if (tvcpu->arch.ceded) |
| kvmppc_fast_vcpu_kick_hv(tvcpu); |
| break; |
| case H_CONFER: |
| target = kvmppc_get_gpr(vcpu, 4); |
| if (target == -1) |
| break; |
| tvcpu = kvmppc_find_vcpu(kvm, target); |
| if (!tvcpu) { |
| ret = H_PARAMETER; |
| break; |
| } |
| yield_count = kvmppc_get_gpr(vcpu, 5); |
| if (kvmppc_get_yield_count(tvcpu) != yield_count) |
| break; |
| kvm_arch_vcpu_yield_to(tvcpu); |
| break; |
| case H_REGISTER_VPA: |
| ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6)); |
| break; |
| case H_RTAS: |
| if (list_empty(&kvm->arch.rtas_tokens)) |
| return RESUME_HOST; |
| |
| idx = srcu_read_lock(&kvm->srcu); |
| rc = kvmppc_rtas_hcall(vcpu); |
| srcu_read_unlock(&kvm->srcu, idx); |
| |
| if (rc == -ENOENT) |
| return RESUME_HOST; |
| else if (rc == 0) |
| break; |
| |
| /* Send the error out to userspace via KVM_RUN */ |
| return rc; |
| case H_LOGICAL_CI_LOAD: |
| ret = kvmppc_h_logical_ci_load(vcpu); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_LOGICAL_CI_STORE: |
| ret = kvmppc_h_logical_ci_store(vcpu); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_SET_MODE: |
| ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6), |
| kvmppc_get_gpr(vcpu, 7)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_XIRR: |
| case H_CPPR: |
| case H_EOI: |
| case H_IPI: |
| case H_IPOLL: |
| case H_XIRR_X: |
| if (kvmppc_xics_enabled(vcpu)) { |
| if (xics_on_xive()) { |
| ret = H_NOT_AVAILABLE; |
| return RESUME_GUEST; |
| } |
| ret = kvmppc_xics_hcall(vcpu, req); |
| break; |
| } |
| return RESUME_HOST; |
| case H_SET_DABR: |
| ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4)); |
| break; |
| case H_SET_XDABR: |
| ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5)); |
| break; |
| #ifdef CONFIG_SPAPR_TCE_IOMMU |
| case H_GET_TCE: |
| ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_PUT_TCE: |
| ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_PUT_TCE_INDIRECT: |
| ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6), |
| kvmppc_get_gpr(vcpu, 7)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| case H_STUFF_TCE: |
| ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6), |
| kvmppc_get_gpr(vcpu, 7)); |
| if (ret == H_TOO_HARD) |
| return RESUME_HOST; |
| break; |
| #endif |
| case H_RANDOM: |
| if (!arch_get_random_seed_long(&vcpu->arch.regs.gpr[4])) |
| ret = H_HARDWARE; |
| break; |
| case H_RPT_INVALIDATE: |
| ret = kvmppc_h_rpt_invalidate(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6), |
| kvmppc_get_gpr(vcpu, 7), |
| kvmppc_get_gpr(vcpu, 8), |
| kvmppc_get_gpr(vcpu, 9)); |
| break; |
| |
| case H_SET_PARTITION_TABLE: |
| ret = H_FUNCTION; |
| if (nesting_enabled(kvm)) |
| ret = kvmhv_set_partition_table(vcpu); |
| break; |
| case H_ENTER_NESTED: |
| ret = H_FUNCTION; |
| if (!nesting_enabled(kvm)) |
| break; |
| ret = kvmhv_enter_nested_guest(vcpu); |
| if (ret == H_INTERRUPT) { |
| kvmppc_set_gpr(vcpu, 3, 0); |
| vcpu->arch.hcall_needed = 0; |
| return -EINTR; |
| } else if (ret == H_TOO_HARD) { |
| kvmppc_set_gpr(vcpu, 3, 0); |
| vcpu->arch.hcall_needed = 0; |
| return RESUME_HOST; |
| } |
| break; |
| case H_TLB_INVALIDATE: |
| ret = H_FUNCTION; |
| if (nesting_enabled(kvm)) |
| ret = kvmhv_do_nested_tlbie(vcpu); |
| break; |
| case H_COPY_TOFROM_GUEST: |
| ret = H_FUNCTION; |
| if (nesting_enabled(kvm)) |
| ret = kvmhv_copy_tofrom_guest_nested(vcpu); |
| break; |
| case H_PAGE_INIT: |
| ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6)); |
| break; |
| case H_SVM_PAGE_IN: |
| ret = H_UNSUPPORTED; |
| if (kvmppc_get_srr1(vcpu) & MSR_S) |
| ret = kvmppc_h_svm_page_in(kvm, |
| kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6)); |
| break; |
| case H_SVM_PAGE_OUT: |
| ret = H_UNSUPPORTED; |
| if (kvmppc_get_srr1(vcpu) & MSR_S) |
| ret = kvmppc_h_svm_page_out(kvm, |
| kvmppc_get_gpr(vcpu, 4), |
| kvmppc_get_gpr(vcpu, 5), |
| kvmppc_get_gpr(vcpu, 6)); |
| break; |
| case H_SVM_INIT_START: |
| ret = H_UNSUPPORTED; |
| if (kvmppc_get_srr1(vcpu) & MSR_S) |
| ret = kvmppc_h_svm_init_start(kvm); |
| break; |
| case H_SVM_INIT_DONE: |
| ret = H_UNSUPPORTED; |
| if (kvmppc_get_srr1(vcpu) & MSR_S) |
| ret = kvmppc_h_svm_init_done(kvm); |
| break; |
| case H_SVM_INIT_ABORT: |
| /* |
| * Even if that call is made by the Ultravisor, the SSR1 value |
| * is the guest context one, with the secure bit clear as it has |
| * not yet been secured. So we can't check it here. |
| * Instead the kvm->arch.secure_guest flag is checked inside |
| * kvmppc_h_svm_init_abort(). |
| */ |
| ret = kvmppc_h_svm_init_abort(kvm); |
| break; |
| |
| default: |
| return RESUME_HOST; |
| } |
| WARN_ON_ONCE(ret == H_TOO_HARD); |
| kvmppc_set_gpr(vcpu, 3, ret); |
| vcpu->arch.hcall_needed = 0; |
| return RESUME_GUEST; |
| } |
| |
| /* |
| * Handle H_CEDE in the P9 path where we don't call the real-mode hcall |
| * handlers in book3s_hv_rmhandlers.S. |
| * |
| * This has to be done early, not in kvmppc_pseries_do_hcall(), so |
| * that the cede logic in kvmppc_run_single_vcpu() works properly. |
| */ |
| static void kvmppc_cede(struct kvm_vcpu *vcpu) |
| { |
| vcpu->arch.shregs.msr |= MSR_EE; |
| vcpu->arch.ceded = 1; |
| smp_mb(); |
| if (vcpu->arch.prodded) { |
| vcpu->arch.prodded = 0; |
| smp_mb(); |
| vcpu->arch.ceded = 0; |
| } |
| } |
| |
| static int kvmppc_hcall_impl_hv(unsigned long cmd) |
| { |
| switch (cmd) { |
| case H_CEDE: |
| case H_PROD: |
| case H_CONFER: |
| case H_REGISTER_VPA: |
| case H_SET_MODE: |
| case H_LOGICAL_CI_LOAD: |
| case H_LOGICAL_CI_STORE: |
| #ifdef CONFIG_KVM_XICS |
| case H_XIRR: |
| case H_CPPR: |
| case H_EOI: |
| case H_IPI: |
| case H_IPOLL: |
| case H_XIRR_X: |
| #endif |
| case H_PAGE_INIT: |
| case H_RPT_INVALIDATE: |
| return 1; |
| } |
| |
| /* See if it's in the real-mode table */ |
| return kvmppc_hcall_impl_hv_realmode(cmd); |
| } |
| |
| static int kvmppc_emulate_debug_inst(struct kvm_vcpu *vcpu) |
| { |
| u32 last_inst; |
| |
| if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != |
| EMULATE_DONE) { |
| /* |
| * Fetch failed, so return to guest and |
| * try executing it again. |
| */ |
| return RESUME_GUEST; |
| } |
| |
| if (last_inst == KVMPPC_INST_SW_BREAKPOINT) { |
| vcpu->run->exit_reason = KVM_EXIT_DEBUG; |
| vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu); |
| return RESUME_HOST; |
| } else { |
| kvmppc_core_queue_program(vcpu, SRR1_PROGILL); |
| return RESUME_GUEST; |
| } |
| } |
| |
| static void do_nothing(void *x) |
| { |
| } |
| |
| static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu) |
| { |
| int thr, cpu, pcpu, nthreads; |
| struct kvm_vcpu *v; |
| unsigned long dpdes; |
| |
| nthreads = vcpu->kvm->arch.emul_smt_mode; |
| dpdes = 0; |
| cpu = vcpu->vcpu_id & ~(nthreads - 1); |
| for (thr = 0; thr < nthreads; ++thr, ++cpu) { |
| v = kvmppc_find_vcpu(vcpu->kvm, cpu); |
| if (!v) |
| continue; |
| /* |
| * If the vcpu is currently running on a physical cpu thread, |
| * interrupt it in order to pull it out of the guest briefly, |
| * which will update its vcore->dpdes value. |
| */ |
| pcpu = READ_ONCE(v->cpu); |
| if (pcpu >= 0) |
| smp_call_function_single(pcpu, do_nothing, NULL, 1); |
| if (kvmppc_doorbell_pending(v)) |
| dpdes |= 1 << thr; |
| } |
| return dpdes; |
| } |
| |
| /* |
| * On POWER9, emulate doorbell-related instructions in order to |
| * give the guest the illusion of running on a multi-threaded core. |
| * The instructions emulated are msgsndp, msgclrp, mfspr TIR, |
| * and mfspr DPDES. |
| */ |
| static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu) |
| { |
| u32 inst, rb, thr; |
| unsigned long arg; |
| struct kvm *kvm = vcpu->kvm; |
| struct kvm_vcpu *tvcpu; |
| |
| if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst) != EMULATE_DONE) |
| return RESUME_GUEST; |
| if (get_op(inst) != 31) |
| return EMULATE_FAIL; |
| rb = get_rb(inst); |
| thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1); |
| switch (get_xop(inst)) { |
| case OP_31_XOP_MSGSNDP: |
| arg = kvmppc_get_gpr(vcpu, rb); |
| if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) |
| break; |
| arg &= 0x7f; |
| if (arg >= kvm->arch.emul_smt_mode) |
| break; |
| tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg); |
| if (!tvcpu) |
| break; |
| if (!tvcpu->arch.doorbell_request) { |
| tvcpu->arch.doorbell_request = 1; |
| kvmppc_fast_vcpu_kick_hv(tvcpu); |
| } |
| break; |
| case OP_31_XOP_MSGCLRP: |
| arg = kvmppc_get_gpr(vcpu, rb); |
| if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) |
| break; |
| vcpu->arch.vcore->dpdes = 0; |
| vcpu->arch.doorbell_request = 0; |
| break; |
| case OP_31_XOP_MFSPR: |
| switch (get_sprn(inst)) { |
| case SPRN_TIR: |
| arg = thr; |
| break; |
| case SPRN_DPDES: |
| arg = kvmppc_read_dpdes(vcpu); |
| break; |
| default: |
| return EMULATE_FAIL; |
| } |
| kvmppc_set_gpr(vcpu, get_rt(inst), arg); |
| break; |
| default: |
| return EMULATE_FAIL; |
| } |
| kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4); |
| return RESUME_GUEST; |
| } |
| |
| static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu, |
| struct task_struct *tsk) |
| { |
| struct kvm_run *run = vcpu->run; |
| int r = RESUME_HOST; |
| |
| vcpu->stat.sum_exits++; |
| |
| /* |
| * This can happen if an interrupt occurs in the last stages |
| * of guest entry or the first stages of guest exit (i.e. after |
| * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV |
| * and before setting it to KVM_GUEST_MODE_HOST_HV). |
| * That can happen due to a bug, or due to a machine check |
| * occurring at just the wrong time. |
| */ |
| if (vcpu->arch.shregs.msr & MSR_HV) { |
| printk(KERN_EMERG "KVM trap in HV mode!\n"); |
| printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", |
| vcpu->arch.trap, kvmppc_get_pc(vcpu), |
| vcpu->arch.shregs.msr); |
| kvmppc_dump_regs(vcpu); |
| run->exit_reason = KVM_EXIT_INTERNAL_ERROR; |
| run->hw.hardware_exit_reason = vcpu->arch.trap; |
| return RESUME_HOST; |
| } |
| run->exit_reason = KVM_EXIT_UNKNOWN; |
| run->ready_for_interrupt_injection = 1; |
| switch (vcpu->arch.trap) { |
| /* We're good on these - the host merely wanted to get our attention */ |
| case BOOK3S_INTERRUPT_HV_DECREMENTER: |
| vcpu->stat.dec_exits++; |
| r = RESUME_GUEST; |
| break; |
| case BOOK3S_INTERRUPT_EXTERNAL: |
| case BOOK3S_INTERRUPT_H_DOORBELL: |
| case BOOK3S_INTERRUPT_H_VIRT: |
| vcpu->stat.ext_intr_exits++; |
| r = RESUME_GUEST; |
| break; |
| /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ |
| case BOOK3S_INTERRUPT_HMI: |
| case BOOK3S_INTERRUPT_PERFMON: |
| case BOOK3S_INTERRUPT_SYSTEM_RESET: |
| r = RESUME_GUEST; |
| break; |
| case BOOK3S_INTERRUPT_MACHINE_CHECK: { |
| static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, |
| DEFAULT_RATELIMIT_BURST); |
| /* |
| * Print the MCE event to host console. Ratelimit so the guest |
| * can't flood the host log. |
| */ |
| if (__ratelimit(&rs)) |
| machine_check_print_event_info(&vcpu->arch.mce_evt,false, true); |
| |
| /* |
| * If the guest can do FWNMI, exit to userspace so it can |
| * deliver a FWNMI to the guest. |
| * Otherwise we synthesize a machine check for the guest |
| * so that it knows that the machine check occurred. |
| */ |
| if (!vcpu->kvm->arch.fwnmi_enabled) { |
| ulong flags = vcpu->arch.shregs.msr & 0x083c0000; |
| kvmppc_core_queue_machine_check(vcpu, flags); |
| r = RESUME_GUEST; |
| break; |
| } |
| |
| /* Exit to guest with KVM_EXIT_NMI as exit reason */ |
| run->exit_reason = KVM_EXIT_NMI; |
| run->hw.hardware_exit_reason = vcpu->arch.trap; |
| /* Clear out the old NMI status from run->flags */ |
| run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK; |
| /* Now set the NMI status */ |
| if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED) |
| run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV; |
| else |
| run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV; |
| |
| r = RESUME_HOST; |
| break; |
| } |
| case BOOK3S_INTERRUPT_PROGRAM: |
| { |
| ulong flags; |
| /* |
| * Normally program interrupts are delivered directly |
| * to the guest by the hardware, but we can get here |
| * as a result of a hypervisor emulation interrupt |
| * (e40) getting turned into a 700 by BML RTAS. |
| */ |
| flags = vcpu->arch.shregs.msr & 0x1f0000ull; |
| kvmppc_core_queue_program(vcpu, flags); |
| r = RESUME_GUEST; |
| break; |
| } |
| case BOOK3S_INTERRUPT_SYSCALL: |
| { |
| int i; |
| |
| if (unlikely(vcpu->arch.shregs.msr & MSR_PR)) { |
| /* |
| * Guest userspace executed sc 1. This can only be |
| * reached by the P9 path because the old path |
| * handles this case in realmode hcall handlers. |
| */ |
| if (!kvmhv_vcpu_is_radix(vcpu)) { |
| /* |
| * A guest could be running PR KVM, so this |
| * may be a PR KVM hcall. It must be reflected |
| * to the guest kernel as a sc interrupt. |
| */ |
| kvmppc_core_queue_syscall(vcpu); |
| } else { |
| /* |
| * Radix guests can not run PR KVM or nested HV |
| * hash guests which might run PR KVM, so this |
| * is always a privilege fault. Send a program |
| * check to guest kernel. |
| */ |
| kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV); |
| } |
| r = RESUME_GUEST; |
| break; |
| } |
| |
| /* |
| * hcall - gather args and set exit_reason. This will next be |
| * handled by kvmppc_pseries_do_hcall which may be able to deal |
| * with it and resume guest, or may punt to userspace. |
| */ |
| run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3); |
| for (i = 0; i < 9; ++i) |
| run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i); |
| run->exit_reason = KVM_EXIT_PAPR_HCALL; |
| vcpu->arch.hcall_needed = 1; |
| r = RESUME_HOST; |
| break; |
| } |
| /* |
| * We get these next two if the guest accesses a page which it thinks |
| * it has mapped but which is not actually present, either because |
| * it is for an emulated I/O device or because the corresonding |
| * host page has been paged out. |
| * |
| * Any other HDSI/HISI interrupts have been handled already for P7/8 |
| * guests. For POWER9 hash guests not using rmhandlers, basic hash |
| * fault handling is done here. |
| */ |
| case BOOK3S_INTERRUPT_H_DATA_STORAGE: { |
| unsigned long vsid; |
| long err; |
| |
| if (vcpu->arch.fault_dsisr == HDSISR_CANARY) { |
| r = RESUME_GUEST; /* Just retry if it's the canary */ |
| break; |
| } |
| |
| if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { |
| /* |
| * Radix doesn't require anything, and pre-ISAv3.0 hash |
| * already attempted to handle this in rmhandlers. The |
| * hash fault handling below is v3 only (it uses ASDR |
| * via fault_gpa). |
| */ |
| r = RESUME_PAGE_FAULT; |
| break; |
| } |
| |
| if (!(vcpu->arch.fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT))) { |
| kvmppc_core_queue_data_storage(vcpu, |
| vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); |
| r = RESUME_GUEST; |
| break; |
| } |
| |
| if (!(vcpu->arch.shregs.msr & MSR_DR)) |
| vsid = vcpu->kvm->arch.vrma_slb_v; |
| else |
| vsid = vcpu->arch.fault_gpa; |
| |
| err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, |
| vsid, vcpu->arch.fault_dsisr, true); |
| if (err == 0) { |
| r = RESUME_GUEST; |
| } else if (err == -1 || err == -2) { |
| r = RESUME_PAGE_FAULT; |
| } else { |
| kvmppc_core_queue_data_storage(vcpu, |
| vcpu->arch.fault_dar, err); |
| r = RESUME_GUEST; |
| } |
| break; |
| } |
| case BOOK3S_INTERRUPT_H_INST_STORAGE: { |
| unsigned long vsid; |
| long err; |
| |
| vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); |
| vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr & |
| DSISR_SRR1_MATCH_64S; |
| if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { |
| /* |
| * Radix doesn't require anything, and pre-ISAv3.0 hash |
| * already attempted to handle this in rmhandlers. The |
| * hash fault handling below is v3 only (it uses ASDR |
| * via fault_gpa). |
| */ |
| if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE) |
| vcpu->arch.fault_dsisr |= DSISR_ISSTORE; |
| r = RESUME_PAGE_FAULT; |
| break; |
| } |
| |
| if (!(vcpu->arch.fault_dsisr & SRR1_ISI_NOPT)) { |
| kvmppc_core_queue_inst_storage(vcpu, |
| vcpu->arch.fault_dsisr); |
| r = RESUME_GUEST; |
| break; |
| } |
| |
| if (!(vcpu->arch.shregs.msr & MSR_IR)) |
| vsid = vcpu->kvm->arch.vrma_slb_v; |
| else |
| vsid = vcpu->arch.fault_gpa; |
| |
| err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, |
| vsid, vcpu->arch.fault_dsisr, false); |
| if (err == 0) { |
| r = RESUME_GUEST; |
| } else if (err == -1) { |
| r = RESUME_PAGE_FAULT; |
| } else { |
| kvmppc_core_queue_inst_storage(vcpu, err); |
| r = RESUME_GUEST; |
| } |
| break; |
| } |
| |
| /* |
| * This occurs if the guest executes an illegal instruction. |
| * If the guest debug is disabled, generate a program interrupt |
| * to the guest. If guest debug is enabled, we need to check |
| * whether the instruction is a software breakpoint instruction. |
| * Accordingly return to Guest or Host. |
| */ |
| case BOOK3S_INTERRUPT_H_EMUL_ASSIST: |
| if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED) |
| vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ? |
| swab32(vcpu->arch.emul_inst) : |
| vcpu->arch.emul_inst; |
| if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) { |
| r = kvmppc_emulate_debug_inst(vcpu); |
| } else { |
| kvmppc_core_queue_program(vcpu, SRR1_PROGILL); |
| r = RESUME_GUEST; |
| } |
| break; |
| |
| #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
| case BOOK3S_INTERRUPT_HV_SOFTPATCH: |
| /* |
| * This occurs for various TM-related instructions that |
| * we need to emulate on POWER9 DD2.2. We have already |
| * handled the cases where the guest was in real-suspend |
| * mode and was transitioning to transactional state. |
| */ |
| r = kvmhv_p9_tm_emulation(vcpu); |
| if (r != -1) |
| break; |
| fallthrough; /* go to facility unavailable handler */ |
| #endif |
| |
| /* |
| * This occurs if the guest (kernel or userspace), does something that |
| * is prohibited by HFSCR. |
| * On POWER9, this could be a doorbell instruction that we need |
| * to emulate. |
| * Otherwise, we just generate a program interrupt to the guest. |
| */ |
| case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: |
| r = EMULATE_FAIL; |
| if (((vcpu->arch.hfscr >> 56) == FSCR_MSGP_LG) && |
| cpu_has_feature(CPU_FTR_ARCH_300)) |
| r = kvmppc_emulate_doorbell_instr(vcpu); |
| if (r == EMULATE_FAIL) { |
| kvmppc_core_queue_program(vcpu, SRR1_PROGILL); |
| r = RESUME_GUEST; |
| } |
| break; |
| |
| case BOOK3S_INTERRUPT_HV_RM_HARD: |
| r = RESUME_PASSTHROUGH; |
| break; |
| default: |
| kvmppc_dump_regs(vcpu); |
| printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", |
| vcpu->arch.trap, kvmppc_get_pc(vcpu), |
| vcpu->arch.shregs.msr); |
| run->hw.hardware_exit_reason = vcpu->arch.trap; |
| r = RESUME_HOST; |
| break; |
| } |
| |
| return r; |
| } |
| |
| static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu) |
| { |
| int r; |
| int srcu_idx; |
| |
| vcpu->stat.sum_exits++; |
| |
| /* |
| * This can happen if an interrupt occurs in the last stages |
| * of guest entry or the first stages of guest exit (i.e. after |
| * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV |
| * and before setting it to KVM_GUEST_MODE_HOST_HV). |
| * That can happen due to a bug, or due to a machine check |
| * occurring at just the wrong time. |
| */ |
| if (vcpu->arch.shregs.msr & MSR_HV) { |
| pr_emerg("KVM trap in HV mode while nested!\n"); |
| pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n", |
| vcpu->arch.trap, kvmppc_get_pc(vcpu), |
| vcpu->arch.shregs.msr); |
| kvmppc_dump_regs(vcpu); |
| return RESUME_HOST; |
| } |
| switch (vcpu->arch.trap) { |
| /* We're good on these - the host merely wanted to get our attention */ |
| case BOOK3S_INTERRUPT_HV_DECREMENTER: |
| vcpu->stat.dec_exits++; |
| r = RESUME_GUEST; |
| break; |
| case BOOK3S_INTERRUPT_EXTERNAL: |
| vcpu->stat.ext_intr_exits++; |
| r = RESUME_HOST; |
| break; |
| case BOOK3S_INTERRUPT_H_DOORBELL: |
| case BOOK3S_INTERRUPT_H_VIRT: |
| vcpu->stat.ext_intr_exits++; |
| r = RESUME_GUEST; |
| break; |
| /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ |
| case BOOK3S_INTERRUPT_HMI: |
| case BOOK3S_INTERRUPT_PERFMON: |
| case BOOK3S_INTERRUPT_SYSTEM_RESET: |
| r = RESUME_GUEST; |
| break; |
| case BOOK3S_INTERRUPT_MACHINE_CHECK: |
| { |
| static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, |
| DEFAULT_RATELIMIT_BURST); |
| /* Pass the machine check to the L1 guest */ |
| r = RESUME_HOST; |
| /* Print the MCE event to host console. */ |
| if (__ratelimit(&rs)) |
| machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); |
| break; |
| } |
| /* |
| * We get these next two if the guest accesses a page which it thinks |
| * it has mapped but which is not actually present, either because |
| * it is for an emulated I/O device or because the corresonding |
| * host page has been paged out. |
| */ |
| case BOOK3S_INTERRUPT_H_DATA_STORAGE: |
| srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
| r = kvmhv_nested_page_fault(vcpu); |
| srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); |
| break; |
| case BOOK3S_INTERRUPT_H_INST_STORAGE: |
| vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); |
| vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) & |
| DSISR_SRR1_MATCH_64S; |
| if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE) |
| vcpu->arch.fault_dsisr |= DSISR_ISSTORE; |
| srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
| r = kvmhv_nested_page_fault(vcpu); |
| srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); |
| break; |
| |
| #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
| case BOOK3S_INTERRUPT_HV_SOFTPATCH: |
| /* |
| * This occurs for various TM-related instructions that |
| * we need to emulate on POWER9 DD2.2. We have already |
| * handled the cases where the guest was in real-suspend |
| * mode and was transitioning to transactional state. |
| */ |
| r = kvmhv_p9_tm_emulation(vcpu); |
| if (r != -1) |
| break; |
| fallthrough; /* go to facility unavailable handler */ |
| #endif |
| |
| case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: { |
| u64 cause = vcpu->arch.hfscr >> 56; |
| |
| /* |
| * Only pass HFU interrupts to the L1 if the facility is |
| * permitted but disabled by the L1's HFSCR, otherwise |
| * the interrupt does not make sense to the L1 so turn |
| * it into a HEAI. |
| */ |
| if (!(vcpu->arch.hfscr_permitted & (1UL << cause)) || |
| (vcpu->arch.nested_hfscr & (1UL << cause))) { |
| vcpu->arch.trap = BOOK3S_INTERRUPT_H_EMUL_ASSIST; |
| |
| /* |
| * If the fetch failed, return to guest and |
| * try executing it again. |
| */ |
| r = kvmppc_get_last_inst(vcpu, INST_GENERIC, |
| &vcpu->arch.emul_inst); |
| if (r != EMULATE_DONE) |
| r = RESUME_GUEST; |
| else |
| r = RESUME_HOST; |
| } else { |
| r = RESUME_HOST; |
| } |
| |
| break; |
| } |
| |
| case BOOK3S_INTERRUPT_HV_RM_HARD: |
| vcpu->arch.trap = 0; |
| r = RESUME_GUEST; |
| if (!xics_on_xive()) |
| kvmppc_xics_rm_complete(vcpu, 0); |
| break; |
| case BOOK3S_INTERRUPT_SYSCALL: |
| { |
| unsigned long req = kvmppc_get_gpr(vcpu, 3); |
| |
| /* |
| * The H_RPT_INVALIDATE hcalls issued by nested |
| * guests for process-scoped invalidations when |
| * GTSE=0, are handled here in L0. |
| */ |
| if (req == H_RPT_INVALIDATE) { |
| r = kvmppc_nested_h_rpt_invalidate(vcpu); |
| break; |
| } |
| |
| r = RESUME_HOST; |
| break; |
| } |
| default: |
| r = RESUME_HOST; |
| break; |
| } |
| |
| return r; |
| } |
| |
| static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu, |
| struct kvm_sregs *sregs) |
| { |
| int i; |
| |
| memset(sregs, 0, sizeof(struct kvm_sregs)); |
| sregs->pvr = vcpu->arch.pvr; |
| for (i = 0; i < vcpu->arch.slb_max; i++) { |
| sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige; |
| sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv; |
| } |
| |
| return 0; |
| } |
| |
| static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu, |
| struct kvm_sregs *sregs) |
| { |
| int i, j; |
| |
| /* Only accept the same PVR as the host's, since we can't spoof it */ |
| if (sregs->pvr != vcpu->arch.pvr) |
| return -EINVAL; |
| |
| j = 0; |
| for (i = 0; i < vcpu->arch.slb_nr; i++) { |
| if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) { |
| vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe; |
| vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv; |
| ++j; |
| } |
| } |
| vcpu->arch.slb_max = j; |
| |
| return 0; |
| } |
| |
| /* |
| * Enforce limits on guest LPCR values based on hardware availability, |
| * guest configuration, and possibly hypervisor support and security |
| * concerns. |
| */ |
| unsigned long kvmppc_filter_lpcr_hv(struct kvm *kvm, unsigned long lpcr) |
| { |
| /* LPCR_TC only applies to HPT guests */ |
| if (kvm_is_radix(kvm)) |
| lpcr &= ~LPCR_TC; |
| |
| /* On POWER8 and above, userspace can modify AIL */ |
| if (!cpu_has_feature(CPU_FTR_ARCH_207S)) |
| lpcr &= ~LPCR_AIL; |
| if ((lpcr & LPCR_AIL) != LPCR_AIL_3) |
| lpcr &= ~LPCR_AIL; /* LPCR[AIL]=1/2 is disallowed */ |
| /* |
| * On some POWER9s we force AIL off for radix guests to prevent |
| * executing in MSR[HV]=1 mode with the MMU enabled and PIDR set to |
| * guest, which can result in Q0 translations with LPID=0 PID=PIDR to |
| * be cached, which the host TLB management does not expect. |
| */ |
| if (kvm_is_radix(kvm) && cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG)) |
| lpcr &= ~LPCR_AIL; |
| |
| /* |
| * On POWER9, allow userspace to enable large decrementer for the |
| * guest, whether or not the host has it enabled. |
| */ |
| if (!cpu_has_feature(CPU_FTR_ARCH_300)) |
| lpcr &= ~LPCR_LD; |
| |
| return lpcr; |
| } |
| |
| static void verify_lpcr(struct kvm *kvm, unsigned long lpcr) |
| { |
| if (lpcr != kvmppc_filter_lpcr_hv(kvm, lpcr)) { |
| WARN_ONCE(1, "lpcr 0x%lx differs from filtered 0x%lx\n", |
| lpcr, kvmppc_filter_lpcr_hv(kvm, lpcr)); |
| } |
| } |
| |
| static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr, |
| bool preserve_top32) |
| { |
| struct kvm *kvm = vcpu->kvm; |
| struct kvmppc_vcore *vc = vcpu->arch.vcore; |
| u64 mask; |
| |
| spin_lock(&vc->lock); |
| |
| /* |
| * Userspace can only modify |
| * DPFD (default prefetch depth), ILE (interrupt little-endian), |
| * TC (translation control), AIL (alternate interrupt location), |
| * LD (large decrementer). |
| * These are subject to restrictions from kvmppc_filter_lcpr_hv(). |
| */ |
| mask = LPCR_DPFD | LPCR_ILE | LPCR_TC | LPCR_AIL | LPCR_LD; |
| |
| /* Broken 32-bit version of LPCR must not clear top bits */ |
| if (preserve_top32) |
| mask &= 0xFFFFFFFF; |
| |
| new_lpcr = kvmppc_filter_lpcr_hv(kvm, |
| (vc->lpcr & ~mask) | (new_lpcr & mask)); |
| |
| /* |
| * If ILE (interrupt little-endian) has changed, update the |
| * MSR_LE bit in the intr_msr for each vcpu in this vcore. |
| */ |
| if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) { |
| struct kvm_vcpu *vcpu; |
| int i; |
| |
| kvm_for_each_vcpu(i, vcpu, kvm) { |
| if (vcpu->arch.vcore != vc) |
| continue; |
| if (new_lpcr & LPCR_ILE) |
| vcpu->arch.intr_msr |= MSR_LE; |
| else |
| vcpu->arch.intr_msr &= ~MSR_LE; |
| } |
| } |
| |
| vc->lpcr = new_lpcr; |
| |
| spin_unlock(&vc->lock); |
| } |
| |
| static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, |
| union kvmppc_one_reg *val) |
| { |
| int r = 0; |
| long int i; |
| |
| switch (id) { |
| case KVM_REG_PPC_DEBUG_INST: |
| *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT); |
| break; |
| case KVM_REG_PPC_HIOR: |
| *val = get_reg_val(id, 0); |
| break; |
| case KVM_REG_PPC_DABR: |
| *val = get_reg_val(id, vcpu->arch.dabr); |
| break; |
| case KVM_REG_PPC_DABRX: |
| *val = get_reg_val(id, vcpu->arch.dabrx); |
| break; |
| case KVM_REG_PPC_DSCR: |
| *val = get_reg_val(id, vcpu->arch.dscr); |
| break; |
| case KVM_REG_PPC_PURR: |
| *val = get_reg_val(id, vcpu->arch.purr); |
| break; |
| case KVM_REG_PPC_SPURR: |
| *val = get_reg_val(id, vcpu->arch.spurr); |
| break; |
| case KVM_REG_PPC_AMR: |
| *val = get_reg_val(id, vcpu->arch.amr); |
| break; |
| case KVM_REG_PPC_UAMOR: |
| *val = get_reg_val(id, vcpu->arch.uamor); |
| break; |
| case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: |
| i = id - KVM_REG_PPC_MMCR0; |
| *val = get_reg_val(id, vcpu->arch.mmcr[i]); |
| break; |
| case KVM_REG_PPC_MMCR2: |
| *val = get_reg_val(id, vcpu->arch.mmcr[2]); |
| break; |
| case KVM_REG_PPC_MMCRA: |
| *val = get_reg_val(id, vcpu->arch.mmcra); |
| break; |
| case KVM_REG_PPC_MMCRS: |
| *val = get_reg_val(id, vcpu->arch.mmcrs); |
| break; |
| case KVM_REG_PPC_MMCR3: |
| *val = get_reg_val(id, vcpu->arch.mmcr[3]); |
| break; |
| case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: |
| i = id - KVM_REG_PPC_PMC1; |
| *val = get_reg_val(id, vcpu->arch.pmc[i]); |
| break; |
| case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: |
| i = id - KVM_REG_PPC_SPMC1; |
| *val = get_reg_val(id, vcpu->arch.spmc[i]); |
| break; |
| case KVM_REG_PPC_SIAR: |
| *val = get_reg_val(id, vcpu->arch.siar); |
| break; |
| case KVM_REG_PPC_SDAR: |
| *val = get_reg_val(id, vcpu->arch.sdar); |
| break; |
| case KVM_REG_PPC_SIER: |
| *val = get_reg_val(id, vcpu->arch.sier[0]); |
| break; |
| case KVM_REG_PPC_SIER2: |
| *val = get_reg_val(id, vcpu->arch.sier[1]); |
| break; |
| case KVM_REG_PPC_SIER3: |
| *val = get_reg_val(id, vcpu->arch.sier[2]); |
| break; |
| case KVM_REG_PPC_IAMR: |
| *val = get_reg_val(id, vcpu->arch.iamr); |
| break; |
| case KVM_REG_PPC_PSPB: |
| *val = get_reg_val(id, vcpu->arch.pspb); |
| break; |
| case KVM_REG_PPC_DPDES: |
| /* |
| * On POWER9, where we are emulating msgsndp etc., |
| * we return 1 bit for each vcpu, which can come from |
| * either vcore->dpdes or doorbell_request. |
| * On POWER8, doorbell_request is 0. |
| */ |
| *val = get_reg_val(id, vcpu->arch.vcore->dpdes | |
| vcpu->arch.doorbell_request); |
| break; |
| case KVM_REG_PPC_VTB: |
| *val = get_reg_val(id, vcpu->arch.vcore->vtb); |
| break; |
| case KVM_REG_PPC_DAWR: |
| *val = get_reg_val(id, vcpu->arch.dawr0); |
| break; |
| case KVM_REG_PPC_DAWRX: |
| *val = get_reg_val(id, vcpu->arch.dawrx0); |
| break; |
| case KVM_REG_PPC_DAWR1: |
| *val = get_reg_val(id, vcpu->arch.dawr1); |
| break; |
| case KVM_REG_PPC_DAWRX1: |
| *val = get_reg_val(id, vcpu->arch.dawrx1); |
| break; |
| case KVM_REG_PPC_CIABR: |
| *val = get_reg_val(id, vcpu->arch.ciabr); |
| break; |
| case KVM_REG_PPC_CSIGR: |
| *val = get_reg_val(id, vcpu->arch.csigr); |
| break; |
| case KVM_REG_PPC_TACR: |
| *val = get_reg_val(id, vcpu->arch.tacr); |
| break; |
| case KVM_REG_PPC_TCSCR: |
| *val = get_reg_val(id, vcpu->arch.tcscr); |
| break; |
| case KVM_REG_PPC_PID: |
| *val = get_reg_val(id, vcpu->arch.pid); |
| break; |
| case KVM_REG_PPC_ACOP: |
| *val = get_reg_val(id, vcpu->arch.acop); |
| break; |
| case KVM_REG_PPC_WORT: |
| *val = get_reg_val(id, vcpu->arch.wort); |
| break; |
| case KVM_REG_PPC_TIDR: |
| *val = get_reg_val(id, vcpu->arch.tid); |
| break; |
| case KVM_REG_PPC_PSSCR: |
| *val = get_reg_val(id, vcpu->arch.psscr); |
| break; |
| case KVM_REG_PPC_VPA_ADDR: |
| spin_lock(&vcpu->arch.vpa_update_lock); |
| *val = get_reg_val(id, vcpu->arch.vpa.next_gpa); |
| spin_unlock(&vcpu->arch.vpa_update_lock); |
| break; |
| case KVM_REG_PPC_VPA_SLB: |
| spin_lock(&vcpu->arch.vpa_update_lock); |
| val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa; |
| val->vpaval.length = vcpu->arch.slb_shadow.len; |
| spin_unlock(&vcpu->arch.vpa_update_lock); |
| break; |
| case KVM_REG_PPC_VPA_DTL: |
| spin_lock(&vcpu->arch.vpa_update_lock); |
| val->vpaval.addr = vcpu->arch.dtl.next_gpa; |
| val->vpaval.length = vcpu->arch.dtl.len; |
| spin_unlock(&vcpu->arch.vpa_update_lock); |
| break; |
| case KVM_REG_PPC_TB_OFFSET: |
| *val = get_reg_val(id, vcpu->arch.vcore->tb_offset); |
| break; |
| case KVM_REG_PPC_LPCR: |
| case KVM_REG_PPC_LPCR_64: |
| *val = get_reg_val(id, vcpu->arch.vcore->lpcr); |
| break; |
| case KVM_REG_PPC_PPR: |
| *val = get_reg_val(id, vcpu->arch.ppr); |
| break; |
| #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
| case KVM_REG_PPC_TFHAR: |
| *val = get_reg_val(id, vcpu->arch.tfhar); |
| break; |
| case KVM_REG_PPC_TFIAR: |
| *val = get_reg_val(id, vcpu->arch.tfiar); |
| break; |
| case KVM_REG_PPC_TEXASR: |
| *val = get_reg_val(id, vcpu->arch.texasr); |
| break; |
| case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: |
| i = id - KVM_REG_PPC_TM_GPR0; |
| *val = get_reg_val(id, vcpu->arch.gpr_tm[i]); |
| break; |
| case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: |
| { |
| int j; |
| i = id - KVM_REG_PPC_TM_VSR0; |
| if (i < 32) |
| for (j = 0; j < TS_FPRWIDTH; j++) |
| val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j]; |
| else { |
| if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
| val->vval = vcpu->arch.vr_tm.vr[i-32]; |
| else |
| r = -ENXIO; |
| } |
| break; |
| } |
| case KVM_REG_PPC_TM_CR: |
| *val = get_reg_val(id, vcpu->arch.cr_tm); |
| break; |
| case KVM_REG_PPC_TM_XER: |
| *val = get_reg_val(id, vcpu->arch.xer_tm); |
| break; |
| case KVM_REG_PPC_TM_LR: |
| *val = get_reg_val(id, vcpu->arch.lr_tm); |
| break; |
| case KVM_REG_PPC_TM_CTR: |
| *val = get_reg_val(id, vcpu->arch.ctr_tm); |
| break; |
| case KVM_REG_PPC_TM_FPSCR: |
| *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr); |
| break; |
| case KVM_REG_PPC_TM_AMR: |
| *val = get_reg_val(id, vcpu->arch.amr_tm); |
| break; |
| case KVM_REG_PPC_TM_PPR: |
| *val = get_reg_val(id, vcpu->arch.ppr_tm); |
| break; |
| case KVM_REG_PPC_TM_VRSAVE: |
| *val = get_reg_val(id, vcpu->arch.vrsave_tm); |
| break; |
| case KVM_REG_PPC_TM_VSCR: |
| if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
| *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]); |
| else |
| r = -ENXIO; |
| break; |
| case KVM_REG_PPC_TM_DSCR: |
| *val = get_reg_val(id, vcpu->arch.dscr_tm); |
| break; |
| case KVM_REG_PPC_TM_TAR: |
| *val = get_reg_val(id, vcpu->arch.tar_tm); |
| break; |
| #endif |
| case KVM_REG_PPC_ARCH_COMPAT: |
| *val = get_reg_val(id, vcpu->arch.vcore->arch_compat); |
| break; |
| case KVM_REG_PPC_DEC_EXPIRY: |
| *val = get_reg_val(id, vcpu->arch.dec_expires + |
| vcpu->arch.vcore->tb_offset); |
| break; |
| case KVM_REG_PPC_ONLINE: |
| *val = get_reg_val(id, vcpu->arch.online); |
| break; |
| case KVM_REG_PPC_PTCR: |
| *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr); |
| break; |
| default: |
| r = -EINVAL; |
| break; |
| } |
| |
| return r; |
| } |
| |
| static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, |
| union kvmppc_one_reg *val) |
| { |
| int r = 0; |
| long int i; |
| unsigned long addr, len; |
| |
| switch (id) { |
| case KVM_REG_PPC_HIOR: |
| /* Only allow this to be set to zero */ |
| if (set_reg_val(id, *val)) |
| r = -EINVAL; |
| break; |
| case KVM_REG_PPC_DABR: |
| vcpu->arch.dabr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_DABRX: |
| vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP; |
| break; |
| case KVM_REG_PPC_DSCR: |
| vcpu->arch.dscr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_PURR: |
| vcpu->arch.purr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_SPURR: |
| vcpu->arch.spurr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_AMR: |
| vcpu->arch.amr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_UAMOR: |
| vcpu->arch.uamor = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: |
| i = id - KVM_REG_PPC_MMCR0; |
| vcpu->arch.mmcr[i] = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_MMCR2: |
| vcpu->arch.mmcr[2] = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_MMCRA: |
| vcpu->arch.mmcra = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_MMCRS: |
| vcpu->arch.mmcrs = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_MMCR3: |
| *val = get_reg_val(id, vcpu->arch.mmcr[3]); |
| break; |
| case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: |
| i = id - KVM_REG_PPC_PMC1; |
| vcpu->arch.pmc[i] = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: |
| i = id - KVM_REG_PPC_SPMC1; |
| vcpu->arch.spmc[i] = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_SIAR: |
| vcpu->arch.siar = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_SDAR: |
| vcpu->arch.sdar = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_SIER: |
| vcpu->arch.sier[0] = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_SIER2: |
| vcpu->arch.sier[1] = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_SIER3: |
| vcpu->arch.sier[2] = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_IAMR: |
| vcpu->arch.iamr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_PSPB: |
| vcpu->arch.pspb = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_DPDES: |
| vcpu->arch.vcore->dpdes = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_VTB: |
| vcpu->arch.vcore->vtb = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_DAWR: |
| vcpu->arch.dawr0 = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_DAWRX: |
| vcpu->arch.dawrx0 = set_reg_val(id, *val) & ~DAWRX_HYP; |
| break; |
| case KVM_REG_PPC_DAWR1: |
| vcpu->arch.dawr1 = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_DAWRX1: |
| vcpu->arch.dawrx1 = set_reg_val(id, *val) & ~DAWRX_HYP; |
| break; |
| case KVM_REG_PPC_CIABR: |
| vcpu->arch.ciabr = set_reg_val(id, *val); |
| /* Don't allow setting breakpoints in hypervisor code */ |
| if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER) |
| vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */ |
| break; |
| case KVM_REG_PPC_CSIGR: |
| vcpu->arch.csigr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TACR: |
| vcpu->arch.tacr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TCSCR: |
| vcpu->arch.tcscr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_PID: |
| vcpu->arch.pid = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_ACOP: |
| vcpu->arch.acop = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_WORT: |
| vcpu->arch.wort = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TIDR: |
| vcpu->arch.tid = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_PSSCR: |
| vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS; |
| break; |
| case KVM_REG_PPC_VPA_ADDR: |
| addr = set_reg_val(id, *val); |
| r = -EINVAL; |
| if (!addr && (vcpu->arch.slb_shadow.next_gpa || |
| vcpu->arch.dtl.next_gpa)) |
| break; |
| r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca)); |
| break; |
| case KVM_REG_PPC_VPA_SLB: |
| addr = val->vpaval.addr; |
| len = val->vpaval.length; |
| r = -EINVAL; |
| if (addr && !vcpu->arch.vpa.next_gpa) |
| break; |
| r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len); |
| break; |
| case KVM_REG_PPC_VPA_DTL: |
| addr = val->vpaval.addr; |
| len = val->vpaval.length; |
| r = -EINVAL; |
| if (addr && (len < sizeof(struct dtl_entry) || |
| !vcpu->arch.vpa.next_gpa)) |
| break; |
| len -= len % sizeof(struct dtl_entry); |
| r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len); |
| break; |
| case KVM_REG_PPC_TB_OFFSET: |
| /* round up to multiple of 2^24 */ |
| vcpu->arch.vcore->tb_offset = |
| ALIGN(set_reg_val(id, *val), 1UL << 24); |
| break; |
| case KVM_REG_PPC_LPCR: |
| kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true); |
| break; |
| case KVM_REG_PPC_LPCR_64: |
| kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false); |
| break; |
| case KVM_REG_PPC_PPR: |
| vcpu->arch.ppr = set_reg_val(id, *val); |
| break; |
| #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
| case KVM_REG_PPC_TFHAR: |
| vcpu->arch.tfhar = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TFIAR: |
| vcpu->arch.tfiar = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TEXASR: |
| vcpu->arch.texasr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: |
| i = id - KVM_REG_PPC_TM_GPR0; |
| vcpu->arch.gpr_tm[i] = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: |
| { |
| int j; |
| i = id - KVM_REG_PPC_TM_VSR0; |
| if (i < 32) |
| for (j = 0; j < TS_FPRWIDTH; j++) |
| vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j]; |
| else |
| if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
| vcpu->arch.vr_tm.vr[i-32] = val->vval; |
| else |
| r = -ENXIO; |
| break; |
| } |
| case KVM_REG_PPC_TM_CR: |
| vcpu->arch.cr_tm = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_XER: |
| vcpu->arch.xer_tm = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_LR: |
| vcpu->arch.lr_tm = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_CTR: |
| vcpu->arch.ctr_tm = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_FPSCR: |
| vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_AMR: |
| vcpu->arch.amr_tm = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_PPR: |
| vcpu->arch.ppr_tm = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_VRSAVE: |
| vcpu->arch.vrsave_tm = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_VSCR: |
| if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
| vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val); |
| else |
| r = - ENXIO; |
| break; |
| case KVM_REG_PPC_TM_DSCR: |
| vcpu->arch.dscr_tm = set_reg_val(id, *val); |
| break; |
| case KVM_REG_PPC_TM_TAR: |
| vcpu->arch.tar_tm = set_reg_val(id, *val); |
| break; |
| #endif |
| case KVM_REG_PPC_ARCH_COMPAT: |
| r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val)); |
| break; |
| case KVM_REG_PPC_DEC_EXPIRY: |
| vcpu->arch.dec_expires = set_reg_val(id, *val) - |
| vcpu->arch.vcore->tb_offset; |
| break; |
| case KVM_REG_PPC_ONLINE: |
| i = set_reg_val(id, *val); |
| if (i && !vcpu->arch.online) |
| atomic_inc(&vcpu->arch.vcore->online_count); |
| else if (!i && vcpu->arch.online) |
| atomic_dec(&vcpu->arch.vcore->online_count); |
| vcpu->arch.online = i; |
| break; |
| case KVM_REG_PPC_PTCR: |
| vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val); |
| break; |
| default: |
| r = -EINVAL; |
| break; |
| } |
| |
| return r; |
| } |
| |
| /* |
| * On POWER9, threads are independent and can be in different partitions. |
| * Therefore we consider each thread to be a subcore. |
| * There is a restriction that all threads have to be in the same |
| * MMU mode (radix or HPT), unfortunately, but since we only support |
| * HPT guests on a HPT host so far, that isn't an impediment yet. |
| */ |
| static int threads_per_vcore(struct kvm *kvm) |
| { |
| if (cpu_has_feature(CPU_FTR_ARCH_300)) |
| return 1; |
| return threads_per_subcore; |
| } |
| |
| static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id) |
| { |
| struct kvmppc_vcore *vcore; |
| |
| vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL); |
| |
| if (vcore == NULL) |
| return NULL; |
| |
| spin_lock_init(&vcore->lock); |
| spin_lock_init(&vcore->stoltb_lock); |
| rcuwait_init(&vcore->wait); |
| vcore->preempt_tb = TB_NIL; |
| vcore->lpcr = kvm->arch.lpcr; |
| vcore->first_vcpuid = id; |
| vcore->kvm = kvm; |
| INIT_LIST_HEAD(&vcore->preempt_list); |
| |
| return vcore; |
| } |
| |
| #ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING |
| static struct debugfs_timings_element { |
| const char *name; |
| size_t offset; |
| } timings[] = { |
| {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)}, |
| {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)}, |
| {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)}, |
| {"guest", offsetof(struct kvm_vcpu, arch.guest_time)}, |
| {"cede", offsetof(struct kvm_vcpu, arch.cede_time)}, |
| }; |
| |
| #define N_TIMINGS (ARRAY_SIZE(timings)) |
| |
| struct debugfs_timings_state { |
| struct kvm_vcpu *vcpu; |
| unsigned int buflen; |
| char buf[N_TIMINGS * 100]; |
| }; |
| |
| static int debugfs_timings_open(struct inode *inode, struct file *file) |
| { |
| struct kvm_vcpu *vcpu = inode->i_private; |
| struct debugfs_timings_state *p; |
| |
| p = kzalloc(sizeof(*p), GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| kvm_get_kvm(vcpu->kvm); |
| p->vcpu = vcpu; |
| file->private_data = p; |
| |
| return nonseekable_open(inode, file); |
| } |
| |
| static int debugfs_timings_release(struct inode *inode, struct file *file) |
| { |
| struct debugfs_timings_state *p = file->private_data; |
| |
| kvm_put_kvm(p->vcpu->kvm); |
| kfree(p); |
| return 0; |
| } |
| |
| static ssize_t debugfs_timings_read(struct file *file, char __user *buf, |
| size_t len, loff_t *ppos) |
| { |
| struct debugfs_timings_state *p = file->private_data; |
| struct kvm_vcpu *vcpu = p->vcpu; |
| char *s, *buf_end; |
| struct kvmhv_tb_accumulator tb; |
| u64 count; |
| loff_t pos; |
| ssize_t n; |
| int i, loops; |
| bool ok; |
| |
| if (!p->buflen) { |
| s = p->buf; |
| buf_end = s + sizeof(p->buf); |
| for (i = 0; i < N_TIMINGS; ++i) { |
| struct kvmhv_tb_accumulator *acc; |
| |
| acc = (struct kvmhv_tb_accumulator *) |
| ((unsigned long)vcpu + timings[i].offset); |
| ok = false; |
| for (loops = 0; loops < 1000; ++loops) { |
| count = acc->seqcount; |
| if (!(count & 1)) { |
| smp_rmb(); |
| tb = *acc; |
| smp_rmb(); |
| if (count == acc->seqcount) { |
| ok = true; |
| break; |
| } |
| } |
| udelay(1); |
| } |
| if (!ok) |
| snprintf(s, buf_end - s, "%s: stuck\n", |
| timings[i].name); |
| else |
| snprintf(s, buf_end - s, |
| "%s: %llu %llu %llu %llu\n", |
| timings[i].name, count / 2, |
| tb_to_ns(tb.tb_total), |
| tb_to_ns(tb.tb_min), |
| tb_to_ns(tb.tb_max)); |
| s += strlen(s); |
| } |
| p->buflen = s - p->buf; |
| } |
| |
| pos = *ppos; |
| if (pos >= p->buflen) |
| return 0; |
| if (len > p->buflen - pos) |
| len = p->buflen - pos; |
| n = copy_to_user(buf, p->buf + pos, len); |
| if (n) { |
| if (n == len) |
| return -EFAULT; |
| len -= n; |
| } |
| *ppos = pos + len; |
| return len; |
| } |
| |
| static ssize_t debugfs_timings_write(struct file *file, const char __user *buf, |
| size_t len, loff_t *ppos) |
| { |
| return -EACCES; |
| } |
| |
| static const struct file_operations debugfs_timings_ops = { |
| .owner = THIS_MODULE, |
| .open = debugfs_timings_open, |
| .release = debugfs_timings_release, |
| .read = debugfs_timings_read, |
| .write = debugfs_timings_write, |
| .llseek = generic_file_llseek, |
| }; |
| |
| /* Create a debugfs directory for the vcpu */ |
| static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) |
| { |
| char buf[16]; |
| struct kvm *kvm = vcpu->kvm; |
| |
| snprintf(buf, sizeof(buf), "vcpu%u", id); |
| vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir); |
| debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir, vcpu, |
| &debugfs_timings_ops); |
| } |
| |
| #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ |
| static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) |
| { |
| } |
| #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ |
| |
| static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu) |
| { |
| int err; |
| int core; |
| struct kvmppc_vcore *vcore; |
| struct kvm *kvm; |
| unsigned int id; |
| |
| kvm = vcpu->kvm; |
| id = vcpu->vcpu_id; |
| |
| vcpu->arch.shared = &vcpu->arch.shregs; |
| #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE |
| /* |
| * The shared struct is never shared on HV, |
| * so we can always use host endianness |
| */ |
| #ifdef __BIG_ENDIAN__ |
| vcpu->arch.shared_big_endian = true; |
| #else |
| vcpu->arch.shared_big_endian = false; |
| #endif |
| #endif |
| vcpu->arch.mmcr[0] = MMCR0_FC; |
| vcpu->arch.ctrl = CTRL_RUNLATCH; |
| /* default to host PVR, since we can't spoof it */ |
| kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR)); |
| spin_lock_init(&vcpu->arch.vpa_update_lock); |
| spin_lock_init(&vcpu->arch.tbacct_lock); |
| vcpu->arch.busy_preempt = TB_NIL; |
| vcpu->arch.shregs.msr = MSR_ME; |
| vcpu->arch.intr_msr = MSR_SF | MSR_ME; |
| |
| /* |
| * Set the default HFSCR for the guest from the host value. |
| * This value is only used on POWER9. |
| * On POWER9, we want to virtualize the doorbell facility, so we |
| * don't set the HFSCR_MSGP bit, and that causes those instructions |
| * to trap and then we emulate them. |
| */ |
| vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB | |
| HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP | HFSCR_PREFIX; |
| if (cpu_has_feature(CPU_FTR_HVMODE)) { |
| vcpu->arch.hfscr &= mfspr(SPRN_HFSCR); |
| #ifdef CONFIG_PPC_TRANSACTIONAL_MEM |
| if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) |
| vcpu->arch.hfscr |= HFSCR_TM; |
| #endif |
| } |
| if (cpu_has_feature(CPU_FTR_TM_COMP)) |
| vcpu->arch.hfscr |= HFSCR_TM; |
| |
| vcpu->arch.hfscr_permitted = vcpu->arch.hfscr; |
| |
| kvmppc_mmu_book3s_hv_init(vcpu); |
| |
| vcpu->arch.state = KVMPPC_VCPU_NOTREADY; |
| |
| init_waitqueue_head(&vcpu->arch.cpu_run); |
| |
| mutex_lock(&kvm->lock); |
| vcore = NULL; |
| err = -EINVAL; |
| if (cpu_has_feature(CPU_FTR_ARCH_300)) { |
| if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) { |
| pr_devel("KVM: VCPU ID too high\n"); |
| core = KVM_MAX_VCORES; |
| } else { |
| BUG_ON(kvm->arch.smt_mode != 1); |
| core = kvmppc_pack_vcpu_id(kvm, id); |
| } |
| } else { |
| core = id / kvm->arch.smt_mode; |
| } |
| if (core < KVM_MAX_VCORES) { |
| vcore = kvm->arch.vcores[core]; |
| if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) { |
| pr_devel("KVM: collision on id %u", id); |
| vcore = NULL; |
| } else if (!vcore) { |
| /* |
| * Take mmu_setup_lock for mutual exclusion |
| * with kvmppc_update_lpcr(). |
| */ |
| err = -ENOMEM; |
| vcore = kvmppc_vcore_create(kvm, |
| id & ~(kvm->arch.smt_mode - 1)); |
| mutex_lock(&kvm->arch.mmu_setup_lock); |
| kvm->arch.vcores[core] = vcore; |
| kvm->arch.online_vcores++; |
| mutex_unlock(&kvm->arch.mmu_setup_lock); |
| } |
| } |
| mutex_unlock(&kvm->lock); |
| |
| if (!vcore) |
| return err; |
| |
| spin_lock(&vcore->lock); |
| ++vcore->num_threads; |
| spin_unlock(&vcore->lock); |
| vcpu->arch.vcore = vcore; |
| vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid; |
| vcpu->arch.thread_cpu = -1; |
| vcpu->arch.prev_cpu = -1; |
| |
| vcpu->arch.cpu_type = KVM_CPU_3S_64; |
| kvmppc_sanity_check(vcpu); |
| |
| debugfs_vcpu_init(vcpu, id); |
| |
| return 0; |
| } |
| |
| static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode, |
| unsigned long flags) |
| { |
| int err; |
| int esmt = 0; |
| |
| if (flags) |
| return -EINVAL; |
| if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode)) |
| return -EINVAL; |
| if (!cpu_has_feature(CPU_FTR_ARCH_300)) { |
| /* |
| * On POWER8 (or POWER7), the threading mode is "strict", |
| * so we pack smt_mode vcpus per vcore. |
| */ |
| if (smt_mode > threads_per_subcore) |
| return -EINVAL; |
| } else { |
| /* |
| * On POWER9, the threading mode is "loose", |
| * so each vcpu gets its own vcore. |
| */ |
| esmt = smt_mode; |
| smt_mode = 1; |
| } |
| mutex_lock(&kvm->lock); |
| err = -EBUSY; |
| if (!kvm->arch.online_vcores) { |
| kvm->arch.smt_mode = smt_mode; |
| kvm->arch.emul_smt_mode = esmt; |
| err = 0; |
| } |
| mutex_unlock(&kvm->lock); |
| |
| return err; |
| } |
| |
| static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa) |
| { |
| if (vpa->pinned_addr) |
| kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa, |
| vpa->dirty); |
| } |
| |
| static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu) |
| { |
| spin_lock(&vcpu->arch.vpa_update_lock); |
| unpin_vpa(vcpu->kvm, &vcpu->arch.dtl); |
| unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow); |
| unpin_vpa(vcpu->kvm, &vcpu->arch.vpa); |
| spin_unlock(&vcpu->arch.vpa_update_lock); |
| } |
| |
| static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu) |
| { |
| /* Indicate we want to get back into the guest */ |
| return 1; |
| } |
| |
| static void kvmppc_set_timer(struct kvm_vcpu *vcpu) |
| { |
| unsigned long dec_nsec, now; |
| |
| now = get_tb(); |
| if (now > vcpu->arch.dec_expires) { |
| /* decrementer has already gone negative */ |
| kvmppc_core_queue_dec(vcpu); |
| kvmppc_core_prepare_to_enter(vcpu); |
| return; |
| } |
| dec_nsec = tb_to_ns(vcpu->arch.dec_expires - now); |
| hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL); |
| vcpu->arch.timer_running = 1; |
| } |
| |
| extern int __kvmppc_vcore_entry(void); |
| |
| static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, |
| struct kvm_vcpu *vcpu) |
| { |
| u64 now; |
| |
| if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) |
| return; |
| spin_lock_irq(&vcpu->arch.tbacct_lock); |
| now = mftb(); |
| vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) - |
| vcpu->arch.stolen_logged; |
| vcpu->arch.busy_preempt = now; |
| vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; |
| spin_unlock_irq(&vcpu->arch.tbacct_lock); |
| --vc->n_runnable; |
| WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL); |
| } |
| |
| static int kvmppc_grab_hwthread(int cpu) |
| { |
| struct paca_struct *tpaca; |
| long timeout = 10000; |
| |
| tpaca = paca_ptrs[cpu]; |
| |
| /* Ensure the thread won't go into the kernel if it wakes */ |
| tpaca->kvm_hstate.kvm_vcpu = NULL; |
| tpaca->kvm_hstate.kvm_vcore = NULL; |
| tpaca->kvm_hstate.napping = 0; |
| smp_wmb(); |
| tpaca->kvm_hstate.hwthread_req = 1; |
| |
| /* |
| * If the thread is already executing in the kernel (e.g. handling |
| * a stray interrupt), wait for it to get back to nap mode. |
| * The smp_mb() is to ensure that our setting of hwthread_req |
| * is visible before we look at hwthread_state, so if this |
| * races with the code at system_reset_pSeries and the thread |
| * misses our setting of hwthread_req, we are sure to see its |
| * setting of hwthread_state, and vice versa. |
| */ |
| smp_mb(); |
| while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) { |
| if (--timeout <= 0) { |
| pr_err("KVM: couldn't grab cpu %d\n", cpu); |
| return -EBUSY; |
| } |
| udelay(1); |
| } |
| return 0; |
| } |
| |
| static void kvmppc_release_hwthread(int cpu) |
| { |
| struct paca_struct *tpaca; |
| |
| tpaca = paca_ptrs[cpu]; |
| tpaca->kvm_hstate.hwthread_req = 0; |
| tpaca->kvm_hstate.kvm_vcpu = NULL; |
| tpaca->kvm_hstate.kvm_vcore = NULL; |
| tpaca->kvm_hstate.kvm_split_mode = NULL; |
| } |
| |
| static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu) |
| { |
| struct kvm_nested_guest *nested = vcpu->arch.nested; |
| cpumask_t *cpu_in_guest; |
| int i; |
| |
| cpu = cpu_first_tlb_thread_sibling(cpu); |
| if (nested) { |
| cpumask_set_cpu(cpu, &nested->need_tlb_flush); |
| cpu_in_guest = &nested->cpu_in_guest; |
| } else { |
| cpumask_set_cpu(cpu, &kvm->arch.need_tlb_flush); |
| cpu_in_guest = &kvm->arch.cpu_in_guest; |
| } |
| /* |
| * Make sure setting of bit in need_tlb_flush precedes |
| * testing of cpu_in_guest bits. The matching barrier on |
| * the other side is the first smp_mb() in kvmppc_run_core(). |
| */ |
| smp_mb(); |
| for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu); |
| i += cpu_tlb_thread_sibling_step()) |
| if (cpumask_test_cpu(i, cpu_in_guest)) |
| smp_call_function_single(i, do_nothing, NULL, 1); |
| } |
| |
| static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu) |
| { |
| struct kvm_nested_guest *nested = vcpu->arch.nested; |
| struct kvm *kvm = vcpu->kvm; |
| int prev_cpu; |
| |
| if (!cpu_has_feature(CPU_FTR_HVMODE)) |
| return; |
| |
| if (nested) |
| prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id]; |
| else |
| prev_cpu = vcpu->arch.prev_cpu; |
| |
| /* |
| * With radix, the guest can do TLB invalidations itself, |
| * and it could choose to use the local form (tlbiel) if |
| * it is invalidating a translation that has only ever been |
| * used on one vcpu. However, that doesn't mean it has |
| * only ever been used on one physical cpu, since vcpus |
| * can move around between pcpus. To cope with this, when |
|