crosvm/tests/plugin_dirty_log.c
Zach Reizner ce8961d1fc allow non-dirty log memory regions from the plugin process
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>
2018-02-12 22:42:37 -08:00

180 lines
4.9 KiB
C

/*
* 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 <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 LOAD_ADDRESS 0x1000
#define SI_ADDRESS 0x8000
#define BL_VALUE 0x12
#define KILL_ADDRESS 0x9000
int g_kill_evt;
void *vcpu_thread(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, &regs);
regs.rflags = 2;
regs.rip = LOAD_ADDRESS;
regs.rbx = BL_VALUE;
regs.rsi = SI_ADDRESS;
crosvm_vcpu_set_regs(vcpu, &regs);
}
if (evt.kind == CROSVM_VCPU_EVENT_KIND_IO_ACCESS &&
evt.io_access.address_space == CROSVM_ADDRESS_SPACE_MMIO &&
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[] = {
/*
0000 881C mov [si],bl
0014 26C606000001 mov byte [es:0x0],0x1
0002 F4 hlt
*/
0x88, 0x1c, 0x26, 0xc6, 0x06, 0x00, 0x00, 0x01, 0xf4
};
struct crosvm *crosvm;
int ret = crosvm_connect(&crosvm);
if (ret) {
fprintf(stderr, "failed to connect to crosvm: %d\n", ret);
return 1;
}
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_MMIO, KILL_ADDRESS, 1);
if (ret) {
fprintf(stderr, "failed to reserve mmio range: %d\n", ret);
return 1;
}
int mem_size = 0x9000;
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, 0);
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 + LOAD_ADDRESS, code, sizeof(code));
struct crosvm_memory *mem_obj;
ret = crosvm_create_memory(crosvm, mem_fd, 0, mem_size, 0, false, true, &mem_obj);
if (ret) {
fprintf(stderr, "failed to create memory in crosvm: %d\n", ret);
return 1;
}
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(crosvm);
if (ret) {
fprintf(stderr, "failed to tell crosvm to start: %d\n", ret);
return 1;
}
uint64_t dummy;
read(g_kill_evt, &dummy, 8);
uint8_t dirty_log[2] = {0};
ret = crosvm_memory_get_dirty_log(crosvm, mem_obj, dirty_log);
if (ret) {
fprintf(stderr, "failed to get dirty log: %d\n", ret);
return 1;
}
if (dirty_log[1] != 0x1) {
fprintf(stderr, "dirty log does not have expected bits: %x\n", dirty_log[1]);
return 1;
}
uint64_t val = *(uint64_t*)(&mem[SI_ADDRESS]);
if (val != BL_VALUE) {
fprintf(stderr, "memory does not have expected value %d\n", val);
return 1;
}
return 0;
}