Test for the KVM_SET_BOOT_CPU_ID ioctl. Check that it correctly allows to change the BSP vcpu.

Signed-off-by: Emanuele Giuseppe Esposito eesposit@redhat.com --- tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 1 + .../selftests/kvm/x86_64/set_boot_cpu_id.c | 151 ++++++++++++++++++ 3 files changed, 153 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/set_boot_cpu_id.c

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore index 32b87cc77c8e..43b8aa82aefe 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -5,6 +5,7 @@ /s390x/resets /s390x/sync_regs_test /x86_64/cr4_cpuid_sync_test +/x86_64/set_boot_cpu_id /x86_64/debug_regs /x86_64/evmcs_test /x86_64/get_cpuid_test diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index a6d61f451f88..e7b62666e06e 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -39,6 +39,7 @@ LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c

TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test +TEST_GEN_PROGS_x86_64 += x86_64/set_boot_cpu_id TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test TEST_GEN_PROGS_x86_64 += x86_64/get_cpuid_test TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid diff --git a/tools/testing/selftests/kvm/x86_64/set_boot_cpu_id.c b/tools/testing/selftests/kvm/x86_64/set_boot_cpu_id.c new file mode 100644 index 000000000000..4077be4e4015 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/set_boot_cpu_id.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test that KVM_SET_BOOT_CPU_ID works as intended + * + * Copyright (C) 2020, Red Hat, Inc. + */ +#define _GNU_SOURCE /* for program_invocation_name */ +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> + +#include "test_util.h" +#include "kvm_util.h" +#include "processor.h" + +#define N_VCPU 2 +#define VCPU_ID0 0 +#define VCPU_ID1 1 + +#define WRONG_BSP 2 + +static uint32_t get_bsp_flag(void) +{ + return rdmsr(MSR_IA32_APICBASE) & MSR_IA32_APICBASE_BSP; +} + +static void guest_bsp_vcpu(void *arg) +{ + GUEST_SYNC(1); + + GUEST_ASSERT(get_bsp_flag() != 0); + + GUEST_DONE(); +} + +static void guest_not_bsp_vcpu(void *arg) +{ + GUEST_SYNC(1); + + GUEST_ASSERT(get_bsp_flag() == 0); + + GUEST_DONE(); +} + +static void run_vcpu(struct kvm_vm *vm, uint32_t vcpuid, int stage) +{ + struct ucall uc; + + printf("vcpu executing...\n"); + vcpu_run(vm, vcpuid); + printf("vcpu executed\n"); + + switch (get_ucall(vm, vcpuid, &uc)) { + case UCALL_SYNC: + printf("stage %d sync %ld\n", stage, uc.args[1]); + TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") && + uc.args[1] == stage + 1, + "Stage %d: Unexpected register values vmexit, got %lx", + stage + 1, (ulong)uc.args[1]); + return; + case UCALL_DONE: + printf("got done\n"); + return; + case UCALL_ABORT: + TEST_ASSERT(false, "%s at %s:%ld\n\tvalues: %#lx, %#lx", (const char *)uc.args[0], + __FILE__, uc.args[1], uc.args[2], uc.args[3]); + default: + TEST_ASSERT(false, "Unexpected exit: %s", + exit_reason_str(vcpu_state(vm, vcpuid)->exit_reason)); + } +} + +static void check_wrong_bsp(void) +{ + struct kvm_vm *vm; + int res; + + vm = vm_create_default(VCPU_ID0, 0, guest_bsp_vcpu); + + res = _kvm_ioctl(vm, KVM_SET_BOOT_CPU_ID, (void *) WRONG_BSP); + TEST_ASSERT(res == -1, "KVM_SET_BOOT_CPU_ID set to a non-existent vcpu %d", WRONG_BSP); + + kvm_vm_free(vm); +} + +static struct kvm_vm *create_vm(void) +{ + struct kvm_vm *vm; + uint64_t vcpu_pages = (DEFAULT_STACK_PGS) * 2; + uint64_t extra_pg_pages = vcpu_pages / PTES_PER_MIN_PAGE * N_VCPU; + uint64_t pages = DEFAULT_GUEST_PHY_PAGES + vcpu_pages + extra_pg_pages; + + pages = vm_adjust_num_guest_pages(VM_MODE_DEFAULT, pages); + vm = vm_create(VM_MODE_DEFAULT, pages, O_RDWR); + + kvm_vm_elf_load(vm, program_invocation_name, 0, 0); + vm_create_irqchip(vm); + + return vm; +} + +static void add_x86_vcpu(struct kvm_vm *vm, uint32_t vcpuid, void *code) +{ + vm_vcpu_add_default(vm, vcpuid, code); + vcpu_set_cpuid(vm, vcpuid, kvm_get_supported_cpuid()); +} + +static void run_vm_bsp(uint32_t bsp_vcpu) +{ + struct kvm_vm *vm; + int stage; + void *vcpu0_code, *vcpu1_code; + + vm = create_vm(); + + vcpu0_code = guest_bsp_vcpu; + vcpu1_code = guest_not_bsp_vcpu; + + if (bsp_vcpu == VCPU_ID1) { + vcpu0_code = guest_not_bsp_vcpu; + vcpu1_code = guest_bsp_vcpu; + + vm_ioctl(vm, KVM_SET_BOOT_CPU_ID, (void *) VCPU_ID1); + } + + add_x86_vcpu(vm, VCPU_ID0, vcpu0_code); + add_x86_vcpu(vm, VCPU_ID1, vcpu1_code); + + for (stage = 0; stage < 2; stage++) { + run_vcpu(vm, VCPU_ID0, stage); + run_vcpu(vm, VCPU_ID1, stage); + } + + kvm_vm_free(vm); +} + +int main(int argc, char *argv[]) +{ + if (!kvm_check_cap(KVM_CAP_SET_BOOT_CPU_ID)) { + print_skip("set_boot_cpu_id not available"); + return 0; + } + + run_vm_bsp(VCPU_ID0); + run_vm_bsp(VCPU_ID1); + run_vm_bsp(VCPU_ID0); + + check_wrong_bsp(); +}