| /* |
| * Copyright (C) 2015 - ARM Ltd |
| * Author: Marc Zyngier <marc.zyngier@arm.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include <linux/linkage.h> |
| |
| #include <asm/alternative.h> |
| #include <asm/assembler.h> |
| #include <asm/cpufeature.h> |
| #include <asm/kvm_arm.h> |
| #include <asm/kvm_asm.h> |
| #include <asm/kvm_mmu.h> |
| |
| .text |
| .pushsection .hyp.text, "ax" |
| |
| .macro do_el2_call |
| /* |
| * Shuffle the parameters before calling the function |
| * pointed to in x0. Assumes parameters in x[1,2,3]. |
| */ |
| mov lr, x0 |
| mov x0, x1 |
| mov x1, x2 |
| mov x2, x3 |
| blr lr |
| .endm |
| |
| ENTRY(__vhe_hyp_call) |
| str lr, [sp, #-16]! |
| do_el2_call |
| ldr lr, [sp], #16 |
| /* |
| * We used to rely on having an exception return to get |
| * an implicit isb. In the E2H case, we don't have it anymore. |
| * rather than changing all the leaf functions, just do it here |
| * before returning to the rest of the kernel. |
| */ |
| isb |
| ret |
| ENDPROC(__vhe_hyp_call) |
| |
| /* |
| * Compute the idmap address of __kvm_hyp_reset based on the idmap |
| * start passed as a parameter, and jump there. |
| * |
| * x0: HYP phys_idmap_start |
| */ |
| ENTRY(__kvm_hyp_teardown) |
| mov x4, x0 |
| adr_l x3, __kvm_hyp_reset |
| |
| /* insert __kvm_hyp_reset()s offset into phys_idmap_start */ |
| bfi x4, x3, #0, #PAGE_SHIFT |
| br x4 |
| ENDPROC(__kvm_hyp_teardown) |
| |
| el1_sync: // Guest trapped into EL2 |
| stp x0, x1, [sp, #-16]! |
| |
| alternative_if_not ARM64_HAS_VIRT_HOST_EXTN |
| mrs x1, esr_el2 |
| alternative_else |
| mrs x1, esr_el1 |
| alternative_endif |
| lsr x0, x1, #ESR_ELx_EC_SHIFT |
| |
| cmp x0, #ESR_ELx_EC_HVC64 |
| b.ne el1_trap |
| |
| mrs x1, vttbr_el2 // If vttbr is valid, the 64bit guest |
| cbnz x1, el1_trap // called HVC |
| |
| /* Here, we're pretty sure the host called HVC. */ |
| ldp x0, x1, [sp], #16 |
| |
| cmp x0, #HVC_GET_VECTORS |
| b.ne 1f |
| mrs x0, vbar_el2 |
| b 2f |
| |
| 1: |
| /* |
| * Perform the EL2 call |
| */ |
| kern_hyp_va x0 |
| do_el2_call |
| |
| 2: eret |
| |
| el1_trap: |
| /* |
| * x0: ESR_EC |
| */ |
| |
| /* Guest accessed VFP/SIMD registers, save host, restore Guest */ |
| cmp x0, #ESR_ELx_EC_FP_ASIMD |
| b.eq __fpsimd_guest_restore |
| |
| mrs x1, tpidr_el2 |
| mov x0, #ARM_EXCEPTION_TRAP |
| b __guest_exit |
| |
| el1_irq: |
| stp x0, x1, [sp, #-16]! |
| mrs x1, tpidr_el2 |
| mov x0, #ARM_EXCEPTION_IRQ |
| b __guest_exit |
| |
| el1_error: |
| stp x0, x1, [sp, #-16]! |
| mrs x1, tpidr_el2 |
| mov x0, #ARM_EXCEPTION_EL1_SERROR |
| b __guest_exit |
| |
| el2_error: |
| /* |
| * Only two possibilities: |
| * 1) Either we come from the exit path, having just unmasked |
| * PSTATE.A: change the return code to an EL2 fault, and |
| * carry on, as we're already in a sane state to handle it. |
| * 2) Or we come from anywhere else, and that's a bug: we panic. |
| * |
| * For (1), x0 contains the original return code and x1 doesn't |
| * contain anything meaningful at that stage. We can reuse them |
| * as temp registers. |
| * For (2), who cares? |
| */ |
| mrs x0, elr_el2 |
| adr x1, abort_guest_exit_start |
| cmp x0, x1 |
| adr x1, abort_guest_exit_end |
| ccmp x0, x1, #4, ne |
| b.ne __hyp_panic |
| mov x0, #(1 << ARM_EXIT_WITH_SERROR_BIT) |
| eret |
| |
| ENTRY(__hyp_do_panic) |
| mov lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\ |
| PSR_MODE_EL1h) |
| msr spsr_el2, lr |
| ldr lr, =panic |
| msr elr_el2, lr |
| eret |
| ENDPROC(__hyp_do_panic) |
| |
| .macro invalid_vector label, target = __hyp_panic |
| .align 2 |
| \label: |
| b \target |
| ENDPROC(\label) |
| .endm |
| |
| /* None of these should ever happen */ |
| invalid_vector el2t_sync_invalid |
| invalid_vector el2t_irq_invalid |
| invalid_vector el2t_fiq_invalid |
| invalid_vector el2t_error_invalid |
| invalid_vector el2h_sync_invalid |
| invalid_vector el2h_irq_invalid |
| invalid_vector el2h_fiq_invalid |
| invalid_vector el1_sync_invalid |
| invalid_vector el1_irq_invalid |
| invalid_vector el1_fiq_invalid |
| |
| .ltorg |
| |
| .align 11 |
| |
| ENTRY(__kvm_hyp_vector) |
| ventry el2t_sync_invalid // Synchronous EL2t |
| ventry el2t_irq_invalid // IRQ EL2t |
| ventry el2t_fiq_invalid // FIQ EL2t |
| ventry el2t_error_invalid // Error EL2t |
| |
| ventry el2h_sync_invalid // Synchronous EL2h |
| ventry el2h_irq_invalid // IRQ EL2h |
| ventry el2h_fiq_invalid // FIQ EL2h |
| ventry el2_error // Error EL2h |
| |
| ventry el1_sync // Synchronous 64-bit EL1 |
| ventry el1_irq // IRQ 64-bit EL1 |
| ventry el1_fiq_invalid // FIQ 64-bit EL1 |
| ventry el1_error // Error 64-bit EL1 |
| |
| ventry el1_sync // Synchronous 32-bit EL1 |
| ventry el1_irq // IRQ 32-bit EL1 |
| ventry el1_fiq_invalid // FIQ 32-bit EL1 |
| ventry el1_error // Error 32-bit EL1 |
| ENDPROC(__kvm_hyp_vector) |