diff options
Diffstat (limited to 'tools/testing/selftests/kvm/x86/hyperv_cpuid.c')
| -rw-r--r-- | tools/testing/selftests/kvm/x86/hyperv_cpuid.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86/hyperv_cpuid.c b/tools/testing/selftests/kvm/x86/hyperv_cpuid.c new file mode 100644 index 000000000000..4e920705681a --- /dev/null +++ b/tools/testing/selftests/kvm/x86/hyperv_cpuid.c @@ -0,0 +1,189 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test for x86 KVM_CAP_HYPERV_CPUID + * + * Copyright (C) 2018, Red Hat, Inc. + * + * This work is licensed under the terms of the GNU GPL, version 2. + * + */ +#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" +#include "vmx.h" + +static void guest_code(void) +{ +} + +static bool smt_possible(void) +{ + char buf[16]; + FILE *f; + bool res = true; + + f = fopen("/sys/devices/system/cpu/smt/control", "r"); + if (f) { + if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) { + if (!strncmp(buf, "forceoff", 8) || + !strncmp(buf, "notsupported", 12)) + res = false; + } + fclose(f); + } + + return res; +} + +static void test_hv_cpuid(struct kvm_vcpu *vcpu, bool evmcs_expected) +{ + const bool has_irqchip = !vcpu || vcpu->vm->has_irqchip; + const struct kvm_cpuid2 *hv_cpuid_entries; + int i; + int nent_expected = 10; + u32 test_val; + + if (vcpu) + hv_cpuid_entries = vcpu_get_supported_hv_cpuid(vcpu); + else + hv_cpuid_entries = kvm_get_supported_hv_cpuid(); + + TEST_ASSERT(hv_cpuid_entries->nent == nent_expected, + "KVM_GET_SUPPORTED_HV_CPUID should return %d entries" + " (returned %d)", + nent_expected, hv_cpuid_entries->nent); + + for (i = 0; i < hv_cpuid_entries->nent; i++) { + const struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; + + TEST_ASSERT((entry->function >= 0x40000000) && + (entry->function <= 0x40000082), + "function %x is our of supported range", + entry->function); + + TEST_ASSERT(entry->index == 0, + ".index field should be zero"); + + TEST_ASSERT(entry->flags == 0, + ".flags field should be zero"); + + TEST_ASSERT(!entry->padding[0] && !entry->padding[1] && + !entry->padding[2], "padding should be zero"); + + switch (entry->function) { + case 0x40000000: + test_val = 0x40000082; + + TEST_ASSERT(entry->eax == test_val, + "Wrong max leaf report in 0x40000000.EAX: %x" + " (evmcs=%d)", + entry->eax, evmcs_expected + ); + break; + case 0x40000003: + TEST_ASSERT(has_irqchip || !(entry->edx & BIT(19)), + "\"Direct\" Synthetic Timers should require in-kernel APIC"); + break; + case 0x40000004: + test_val = entry->eax & (1UL << 18); + + TEST_ASSERT(!!test_val == !smt_possible(), + "NoNonArchitecturalCoreSharing bit" + " doesn't reflect SMT setting"); + + TEST_ASSERT(has_irqchip || !(entry->eax & BIT(10)), + "Cluster IPI (i.e. SEND_IPI) should require in-kernel APIC"); + break; + case 0x4000000A: + TEST_ASSERT(entry->eax & (1UL << 19), + "Enlightened MSR-Bitmap should always be supported" + " 0x40000000.EAX: %x", entry->eax); + if (evmcs_expected) + TEST_ASSERT((entry->eax & 0xffff) == 0x101, + "Supported Enlightened VMCS version range is supposed to be 1:1" + " 0x40000000.EAX: %x", entry->eax); + + break; + default: + break; + + } + /* + * If needed for debug: + * fprintf(stdout, + * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n", + * entry->function, entry->eax, entry->ebx, entry->ecx, + * entry->edx); + */ + } + + /* + * Note, the CPUID array returned by the system-scoped helper is a one- + * time allocation, i.e. must not be freed. + */ + if (vcpu) + free((void *)hv_cpuid_entries); +} + +static void test_hv_cpuid_e2big(struct kvm_vm *vm, struct kvm_vcpu *vcpu) +{ + static struct kvm_cpuid2 cpuid = {.nent = 0}; + int ret; + + if (vcpu) + ret = __vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); + else + ret = __kvm_ioctl(vm->kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); + + TEST_ASSERT(ret == -1 && errno == E2BIG, + "%s KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" + " it should have: %d %d", !vcpu ? "KVM" : "vCPU", ret, errno); +} + +int main(int argc, char *argv[]) +{ + struct kvm_vm *vm; + struct kvm_vcpu *vcpu; + + TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID)); + + /* Test the vCPU ioctl without an in-kernel local APIC. */ + vm = vm_create_barebones(); + vcpu = __vm_vcpu_add(vm, 0); + test_hv_cpuid(vcpu, false); + kvm_vm_free(vm); + + /* Test vCPU ioctl version */ + vm = vm_create_with_one_vcpu(&vcpu, guest_code); + test_hv_cpuid_e2big(vm, vcpu); + test_hv_cpuid(vcpu, false); + + if (!kvm_cpu_has(X86_FEATURE_VMX) || + !kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) { + print_skip("Enlightened VMCS is unsupported"); + goto do_sys; + } + vcpu_enable_evmcs(vcpu); + test_hv_cpuid(vcpu, true); + +do_sys: + /* Test system ioctl version */ + if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID)) { + print_skip("KVM_CAP_SYS_HYPERV_CPUID not supported"); + goto out; + } + + test_hv_cpuid_e2big(vm, NULL); + test_hv_cpuid(NULL, kvm_cpu_has(X86_FEATURE_VMX)); + +out: + kvm_vm_free(vm); + + return 0; +} |