| /* |
| * Copyright 2017 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 <stdbool.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 SERIAL_ADDRESS 0x3f8 |
| #define KILL_ADDRESS 0x3f9 |
| |
| static char g_serial_out[16]; |
| static int g_kill_evt; |
| |
| static bool g_paused; |
| static bool g_exit_loop; |
| static pthread_mutex_t g_pause_mutex = PTHREAD_MUTEX_INITIALIZER; |
| static pthread_cond_t g_pause_cond = PTHREAD_COND_INITIALIZER; |
| |
| static volatile int count; |
| |
| static void *vcpu_thread_fn(void *arg) { |
| struct crosvm_vcpu *vcpu = arg; |
| struct crosvm_vcpu_event evt; |
| int i = 0; |
| |
| 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); |
| |
| /* Signal the main thread that init is done */ |
| uint64_t dummy = 1; |
| write(g_kill_evt, &dummy, sizeof(dummy)); |
| } |
| else if (evt.kind == CROSVM_VCPU_EVENT_KIND_IO_ACCESS && |
| 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; |
| } |
| else if (evt.kind == CROSVM_VCPU_EVENT_KIND_PAUSED) { |
| /* Signal that we paused */ |
| uint64_t dummy = 1; |
| write(g_kill_evt, &dummy, sizeof(dummy)); |
| |
| /* Wait till we can continue again */ |
| pthread_mutex_lock(&g_pause_mutex); |
| while (g_paused) |
| pthread_cond_wait(&g_pause_cond, &g_pause_mutex); |
| |
| /* Kick the VM from infinite loop if requested */ |
| if (g_exit_loop) { |
| struct kvm_regs regs; |
| crosvm_vcpu_get_regs(vcpu, ®s); |
| regs.rbx = 1; |
| crosvm_vcpu_set_regs(vcpu, ®s); |
| } |
| |
| /* Signal that we are no longer paused */ |
| write(g_kill_evt, &dummy, sizeof(dummy)); |
| |
| pthread_mutex_unlock(&g_pause_mutex); |
| } |
| crosvm_vcpu_resume(vcpu); |
| } |
| |
| return NULL; |
| } |
| |
| static int signal_pause(struct crosvm *crosvm) { |
| pthread_mutex_lock(&g_pause_mutex); |
| g_paused = true; |
| pthread_mutex_unlock(&g_pause_mutex); |
| |
| return crosvm_pause_vcpus(crosvm, 1, NULL); |
| } |
| |
| static void signal_unpause(struct crosvm *crosvm, bool exit_loop) { |
| pthread_mutex_lock(&g_pause_mutex); |
| g_paused = false; |
| g_exit_loop = exit_loop; |
| pthread_cond_broadcast(&g_pause_cond); |
| pthread_mutex_unlock(&g_pause_mutex); |
| } |
| |
| int main(int argc, char** argv) { |
| const uint8_t code[] = { |
| /* |
| 0000 00D8 add al,bl |
| 0002 80FB01 cmp bl, 0x1 |
| 0005 75F9 jne 0x0 |
| 0007 BAF903 mov dx,0x3f8 |
| 000A B001 mov al,0x1 |
| 000C EE out dx,al |
| 000D F4 hlt |
| */ |
| 0x00, 0xd8, |
| 0x80, 0xfb, 0x01, |
| 0x75, 0xf9, |
| 0xba, 0xf9, 0x03, |
| 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; |
| } |
| |
| /* 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_range(crosvm, CROSVM_ADDRESS_SPACE_IOPORT, |
| KILL_ADDRESS, 1); |
| if (ret) { |
| fprintf(stderr, "failed to reserve mmio 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 create a thread for the vcpu */ |
| struct crosvm_vcpu *vcpu; |
| ret = crosvm_get_vcpu(crosvm, 0, &vcpu); |
| if (ret) { |
| fprintf(stderr, "error while getting vcpu: %d\n", ret); |
| return 1; |
| } |
| |
| pthread_t vcpu_thread; |
| ret = pthread_create(&vcpu_thread, NULL, vcpu_thread_fn, vcpu); |
| if (ret) { |
| fprintf(stderr, "failed to createvcpu thread\n"); |
| return 1; |
| } |
| |
| ret = crosvm_start(crosvm); |
| if (ret) { |
| fprintf(stderr, "failed to tell crosvm to start: %d\n", ret); |
| return 1; |
| } |
| |
| /* Wait till VCPU thread tells us that its initialization is done */ |
| uint64_t dummy; |
| read(g_kill_evt, &dummy, sizeof(dummy)); |
| |
| ret = signal_pause(crosvm); |
| if (ret) { |
| fprintf(stderr, "failed to pause vcpus (1st time): %d\n", ret); |
| return 1; |
| } |
| |
| /* Wait till VCPU thread tells us it is paused */ |
| read(g_kill_evt, &dummy, sizeof(dummy)); |
| |
| /* Try pausing VCPUs 2nd time to make sure we do not deadlock */ |
| ret = signal_pause(crosvm); |
| if (ret) { |
| fprintf(stderr, "failed to pause vcpus (2nd time): %d\n", ret); |
| return 1; |
| } |
| |
| signal_unpause(crosvm, false); |
| |
| /* Wait until VCPU thread tells us that it is no longer paused */ |
| read(g_kill_evt, &dummy, sizeof(dummy)); |
| |
| /* |
| * Try pausing VCPUs 3rd time to see if we will miss pause |
| * request as we are exiting previous pause. |
| */ |
| ret = signal_pause(crosvm); |
| if (ret) { |
| fprintf(stderr, "failed to pause vcpus (2nd time): %d\n", ret); |
| return 1; |
| } |
| |
| signal_unpause(crosvm, true); |
| |
| /* Wait until VCPU thread tells us that it is no longer paused */ |
| read(g_kill_evt, &dummy, sizeof(dummy)); |
| |
| /* Wait for crosvm to request that we exit otherwise we will be killed. */ |
| read(g_kill_evt, &dummy, sizeof(dummy)); |
| |
| 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_range(crosvm, CROSVM_ADDRESS_SPACE_IOPORT, |
| KILL_ADDRESS, 0); |
| if (ret) { |
| fprintf(stderr, "failed to unreserve mmio range: %d\n", ret); |
| return 1; |
| } |
| |
| return 0; |
| } |
