| /* |
| * Copyright 2019 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <linux/memfd.h> |
| #include <pthread.h> |
| #include <signal.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mman.h> |
| #include <sys/syscall.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include "crosvm.h" |
| |
| #ifndef F_LINUX_SPECIFIC_BASE |
| #define F_LINUX_SPECIFIC_BASE 1024 |
| #endif |
| |
| #ifndef F_ADD_SEALS |
| #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9) |
| #endif |
| |
| #ifndef F_SEAL_SHRINK |
| #define F_SEAL_SHRINK 0x0002 |
| #endif |
| |
| #define KILL_ADDRESS 0x3f9 |
| #define ASYNC_ADDRESS 0x500 |
| |
| int g_kill_evt; |
| int got_error = 0; |
| |
| void *vcpu_thread(void *arg) { |
| struct crosvm_vcpu *vcpu = arg; |
| struct crosvm_vcpu_event evt; |
| while (crosvm_vcpu_wait(vcpu, &evt) == 0) { |
| if (evt.kind == CROSVM_VCPU_EVENT_KIND_INIT) { |
| struct kvm_sregs sregs; |
| crosvm_vcpu_get_sregs(vcpu, &sregs); |
| sregs.cs.base = 0; |
| sregs.cs.selector = 0; |
| sregs.es.base = KILL_ADDRESS; |
| sregs.es.selector = 0; |
| crosvm_vcpu_set_sregs(vcpu, &sregs); |
| |
| struct kvm_regs regs; |
| crosvm_vcpu_get_regs(vcpu, ®s); |
| regs.rip = 0x1000; |
| regs.rax = 2; |
| regs.rbx = 7; |
| regs.rflags = 2; |
| crosvm_vcpu_set_regs(vcpu, ®s); |
| } |
| if (evt.kind == CROSVM_VCPU_EVENT_KIND_IO_ACCESS) { |
| if (evt.io_access.address_space == CROSVM_ADDRESS_SPACE_IOPORT && |
| evt.io_access.address == ASYNC_ADDRESS && |
| evt.io_access.is_write && |
| evt.io_access.length == 1) { |
| int ret; |
| if (!evt.io_access.no_resume) { |
| fprintf(stderr, "should have been told not to resume\n"); |
| got_error = 1; |
| } |
| |
| ret = crosvm_vcpu_wait(vcpu, &evt); |
| if (ret == 0) { |
| if (evt.kind != CROSVM_VCPU_EVENT_KIND_IO_ACCESS || |
| evt.io_access.address_space != |
| CROSVM_ADDRESS_SPACE_IOPORT || |
| evt.io_access.address != ASYNC_ADDRESS || |
| !evt.io_access.is_write || |
| !evt.io_access.no_resume || |
| evt.io_access.length != 1) { |
| fprintf(stderr, "got unexpected wait #1 result\n"); |
| got_error = 1; |
| } |
| } else { |
| fprintf(stderr, "crosvm_vcpu_wait() #1 failed: %d\n", ret); |
| got_error = 1; |
| } |
| |
| ret = crosvm_vcpu_wait(vcpu, &evt); |
| if (ret == 0) { |
| if (evt.kind != CROSVM_VCPU_EVENT_KIND_IO_ACCESS || |
| evt.io_access.address_space != |
| CROSVM_ADDRESS_SPACE_IOPORT || |
| evt.io_access.address != ASYNC_ADDRESS || |
| !evt.io_access.is_write || |
| !evt.io_access.no_resume || |
| evt.io_access.length != 1) { |
| fprintf(stderr, "got unexpected wait #2 result\n"); |
| got_error = 1; |
| } |
| } else { |
| fprintf(stderr, "crosvm_vcpu_wait() #2 failed: %d\n", ret); |
| got_error = 1; |
| } |
| |
| // skip the crosvm_vcpu_resume() |
| continue; |
| } |
| if (evt.io_access.address_space == CROSVM_ADDRESS_SPACE_IOPORT && |
| evt.io_access.address == KILL_ADDRESS && |
| evt.io_access.is_write && |
| evt.io_access.length == 1 && |
| evt.io_access.data[0] == 1) |
| { |
| uint64_t dummy = 1; |
| write(g_kill_evt, &dummy, sizeof(dummy)); |
| return NULL; |
| } |
| } |
| |
| crosvm_vcpu_resume(vcpu); |
| } |
| |
| return NULL; |
| } |
| |
| int main(int argc, char** argv) { |
| const uint8_t code[] = { |
| /* |
| B007 mov al,0x7 |
| BA0005 mov dx,0x500 |
| EE out dx,al |
| EE out dx,al |
| EE out dx,al |
| BAF903 mov dx,0x3f9 |
| B001 mov al,0x1 |
| EE out dx,al |
| F4 hlt |
| */ |
| 0xb0, 0x7, |
| 0xba, (ASYNC_ADDRESS & 0xFF), ((ASYNC_ADDRESS >> 8) & 0xFF), |
| 0xee, |
| 0xee, |
| 0xee, |
| 0xba, (KILL_ADDRESS & 0xFF), ((KILL_ADDRESS >> 8) & 0xFF), |
| 0xb0, 0x01, |
| 0xee, |
| 0xf4 |
| }; |
| |
| struct crosvm *crosvm; |
| int ret = crosvm_connect(&crosvm); |
| if (ret) { |
| fprintf(stderr, "failed to connect to crosvm: %d\n", ret); |
| return 1; |
| } |
| |
| /* |
| * Not strictly necessary, but demonstrates we can have as many connections |
| * as we please. |
| */ |
| struct crosvm *extra_crosvm; |
| ret = crosvm_new_connection(crosvm, &extra_crosvm); |
| if (ret) { |
| fprintf(stderr, "failed to make new socket: %d\n", ret); |
| return 1; |
| } |
| |
| /* We needs this eventfd to know when to exit before being killed. */ |
| g_kill_evt = crosvm_get_shutdown_eventfd(crosvm); |
| if (g_kill_evt < 0) { |
| fprintf(stderr, "failed to get kill eventfd: %d\n", g_kill_evt); |
| return 1; |
| } |
| |
| ret = crosvm_reserve_async_write_range(crosvm, CROSVM_ADDRESS_SPACE_IOPORT, |
| ASYNC_ADDRESS, 1); |
| if (ret) { |
| fprintf(stderr, "failed to reserve async ioport range: %d\n", ret); |
| return 1; |
| } |
| |
| ret = crosvm_reserve_range(crosvm, CROSVM_ADDRESS_SPACE_IOPORT, |
| KILL_ADDRESS, 1); |
| if (ret) { |
| fprintf(stderr, "failed to reserve kill ioport range: %d\n", ret); |
| return 1; |
| } |
| |
| int mem_size = 0x2000; |
| int mem_fd = syscall(SYS_memfd_create, "guest_mem", |
| MFD_CLOEXEC | MFD_ALLOW_SEALING); |
| if (mem_fd < 0) { |
| fprintf(stderr, "failed to create guest memfd: %d\n", errno); |
| return 1; |
| } |
| ret = ftruncate(mem_fd, mem_size); |
| if (ret) { |
| fprintf(stderr, "failed to set size of guest memory: %d\n", errno); |
| return 1; |
| } |
| uint8_t *mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, |
| mem_fd, 0x1000); |
| if (mem == MAP_FAILED) { |
| fprintf(stderr, "failed to mmap guest memory: %d\n", errno); |
| return 1; |
| } |
| fcntl(mem_fd, F_ADD_SEALS, F_SEAL_SHRINK); |
| memcpy(mem, code, sizeof(code)); |
| |
| struct crosvm_memory *mem_obj; |
| ret = crosvm_create_memory(crosvm, mem_fd, 0x1000, 0x1000, 0x1000, false, |
| false, &mem_obj); |
| if (ret) { |
| fprintf(stderr, "failed to create memory in crosvm: %d\n", ret); |
| return 1; |
| } |
| |
| /* get and creat a thread for each vcpu */ |
| struct crosvm_vcpu *vcpus[32]; |
| pthread_t vcpu_threads[32]; |
| uint32_t vcpu_count; |
| for (vcpu_count = 0; vcpu_count < 32; vcpu_count++) { |
| ret = crosvm_get_vcpu(crosvm, vcpu_count, &vcpus[vcpu_count]); |
| if (ret == -ENOENT) |
| break; |
| |
| if (ret) { |
| fprintf(stderr, "error while getting all vcpus: %d\n", ret); |
| return 1; |
| } |
| pthread_create(&vcpu_threads[vcpu_count], NULL, vcpu_thread, |
| vcpus[vcpu_count]); |
| } |
| |
| ret = crosvm_start(extra_crosvm); |
| if (ret) { |
| fprintf(stderr, "failed to tell crosvm to start: %d\n", ret); |
| return 1; |
| } |
| |
| /* Wait for crosvm to request that we exit otherwise we will be killed. */ |
| uint64_t dummy; |
| read(g_kill_evt, &dummy, 8); |
| |
| ret = crosvm_destroy_memory(crosvm, &mem_obj); |
| if (ret) { |
| fprintf(stderr, "failed to destroy memory in crosvm: %d\n", ret); |
| return 1; |
| } |
| |
| ret = crosvm_reserve_async_write_range(crosvm, CROSVM_ADDRESS_SPACE_IOPORT, |
| ASYNC_ADDRESS, 0); |
| if (ret) { |
| fprintf(stderr, "failed to unreserve async ioport range: %d\n", ret); |
| return 1; |
| } |
| |
| ret = crosvm_reserve_range(crosvm, CROSVM_ADDRESS_SPACE_IOPORT, |
| KILL_ADDRESS, 0); |
| if (ret) { |
| fprintf(stderr, "failed to unreserve kill ioport range: %d\n", ret); |
| return 1; |
| } |
| |
| if (got_error) { |
| fprintf(stderr, "vm ran to completion but with an error\n"); |
| return 1; |
| } |
| |
| return 0; |
| } |
