mirror of
https://chromium.googlesource.com/crosvm/crosvm
synced 2024-11-25 05:03:05 +00:00
ce8961d1fc
Dirty logging is not necessary for every memory region, so the plugin process should be able to specific exactly which regions it would like dirty logging enabled for. TEST=cargo test --features plugin BUG=chromium:800626 Change-Id: I28b8285357e7de1c8c3a1392bdfdb4853ec5a654 Reviewed-on: https://chromium-review.googlesource.com/900294 Commit-Ready: Zach Reizner <zachr@chromium.org> Tested-by: Zach Reizner <zachr@chromium.org> Reviewed-by: Dylan Reid <dgreid@chromium.org>
180 lines
4.9 KiB
C
180 lines
4.9 KiB
C
/*
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* Copyright 2017 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/memfd.h>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/syscall.h>
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#include <time.h>
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#include <unistd.h>
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#include "crosvm.h"
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#ifndef F_LINUX_SPECIFIC_BASE
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#define F_LINUX_SPECIFIC_BASE 1024
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#endif
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#ifndef F_ADD_SEALS
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#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
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#endif
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#ifndef F_SEAL_SHRINK
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#define F_SEAL_SHRINK 0x0002
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#endif
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#define LOAD_ADDRESS 0x1000
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#define SI_ADDRESS 0x8000
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#define BL_VALUE 0x12
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#define KILL_ADDRESS 0x9000
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int g_kill_evt;
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void *vcpu_thread(void *arg) {
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struct crosvm_vcpu *vcpu = arg;
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struct crosvm_vcpu_event evt;
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int i = 0;
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while (crosvm_vcpu_wait(vcpu, &evt) == 0) {
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if (evt.kind == CROSVM_VCPU_EVENT_KIND_INIT) {
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struct kvm_sregs sregs;
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crosvm_vcpu_get_sregs(vcpu, &sregs);
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sregs.cs.base = 0;
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sregs.cs.selector = 0;
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sregs.es.base = KILL_ADDRESS;
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sregs.es.selector = 0;
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crosvm_vcpu_set_sregs(vcpu, &sregs);
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struct kvm_regs regs;
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crosvm_vcpu_get_regs(vcpu, ®s);
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regs.rflags = 2;
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regs.rip = LOAD_ADDRESS;
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regs.rbx = BL_VALUE;
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regs.rsi = SI_ADDRESS;
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crosvm_vcpu_set_regs(vcpu, ®s);
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}
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if (evt.kind == CROSVM_VCPU_EVENT_KIND_IO_ACCESS &&
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evt.io_access.address_space == CROSVM_ADDRESS_SPACE_MMIO &&
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evt.io_access.address == KILL_ADDRESS &&
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evt.io_access.is_write &&
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evt.io_access.length == 1 &&
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evt.io_access.data[0] == 1)
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{
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uint64_t dummy = 1;
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write(g_kill_evt, &dummy, sizeof(dummy));
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return NULL;
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}
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crosvm_vcpu_resume(vcpu);
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}
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return NULL;
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}
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int main(int argc, char** argv) {
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const uint8_t code[] = {
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/*
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0000 881C mov [si],bl
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0014 26C606000001 mov byte [es:0x0],0x1
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0002 F4 hlt
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*/
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0x88, 0x1c, 0x26, 0xc6, 0x06, 0x00, 0x00, 0x01, 0xf4
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};
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struct crosvm *crosvm;
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int ret = crosvm_connect(&crosvm);
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if (ret) {
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fprintf(stderr, "failed to connect to crosvm: %d\n", ret);
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return 1;
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}
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g_kill_evt = crosvm_get_shutdown_eventfd(crosvm);
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if (g_kill_evt < 0) {
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fprintf(stderr, "failed to get kill eventfd: %d\n", g_kill_evt);
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return 1;
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}
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ret = crosvm_reserve_range(crosvm, CROSVM_ADDRESS_SPACE_MMIO, KILL_ADDRESS, 1);
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if (ret) {
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fprintf(stderr, "failed to reserve mmio range: %d\n", ret);
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return 1;
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}
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int mem_size = 0x9000;
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int mem_fd = syscall(SYS_memfd_create, "guest_mem", MFD_CLOEXEC | MFD_ALLOW_SEALING);
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if (mem_fd < 0) {
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fprintf(stderr, "failed to create guest memfd: %d\n", errno);
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return 1;
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}
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ret = ftruncate(mem_fd, mem_size);
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if (ret) {
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fprintf(stderr, "failed to set size of guest memory: %d\n", errno);
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return 1;
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}
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uint8_t *mem = mmap(NULL, mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, mem_fd, 0);
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if (mem == MAP_FAILED) {
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fprintf(stderr, "failed to mmap guest memory: %d\n", errno);
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return 1;
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}
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fcntl(mem_fd, F_ADD_SEALS, F_SEAL_SHRINK);
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memcpy(mem + LOAD_ADDRESS, code, sizeof(code));
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struct crosvm_memory *mem_obj;
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ret = crosvm_create_memory(crosvm, mem_fd, 0, mem_size, 0, false, true, &mem_obj);
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if (ret) {
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fprintf(stderr, "failed to create memory in crosvm: %d\n", ret);
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return 1;
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}
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struct crosvm_vcpu *vcpus[32];
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pthread_t vcpu_threads[32];
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uint32_t vcpu_count;
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for (vcpu_count = 0; vcpu_count < 32; vcpu_count++) {
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ret = crosvm_get_vcpu(crosvm, vcpu_count, &vcpus[vcpu_count]);
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if (ret == -ENOENT)
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break;
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if (ret) {
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fprintf(stderr, "error while getting all vcpus: %d\n", ret);
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return 1;
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}
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pthread_create(&vcpu_threads[vcpu_count], NULL, vcpu_thread, vcpus[vcpu_count]);
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}
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ret = crosvm_start(crosvm);
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if (ret) {
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fprintf(stderr, "failed to tell crosvm to start: %d\n", ret);
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return 1;
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}
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uint64_t dummy;
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read(g_kill_evt, &dummy, 8);
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uint8_t dirty_log[2] = {0};
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ret = crosvm_memory_get_dirty_log(crosvm, mem_obj, dirty_log);
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if (ret) {
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fprintf(stderr, "failed to get dirty log: %d\n", ret);
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return 1;
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}
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if (dirty_log[1] != 0x1) {
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fprintf(stderr, "dirty log does not have expected bits: %x\n", dirty_log[1]);
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return 1;
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}
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uint64_t val = *(uint64_t*)(&mem[SI_ADDRESS]);
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if (val != BL_VALUE) {
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fprintf(stderr, "memory does not have expected value %d\n", val);
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return 1;
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}
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return 0;
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}
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