diff options
Diffstat (limited to 'tests/plugin_async_write.c')
| -rw-r--r-- | tests/plugin_async_write.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/tests/plugin_async_write.c b/tests/plugin_async_write.c new file mode 100644 index 0000000..5c99f25 --- /dev/null +++ b/tests/plugin_async_write.c @@ -0,0 +1,273 @@ +/* + * 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; +} |