/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #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; }