// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019, Google LLC.
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*
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* Tests for the IA32_XSS MSR.
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*/
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#define _GNU_SOURCE /* for program_invocation_short_name */
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#include <sys/ioctl.h>
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#include "test_util.h"
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#include "kvm_util.h"
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#include "vmx.h"
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#define VCPU_ID 1
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#define MSR_BITS 64
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#define X86_FEATURE_XSAVES (1<<3)
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bool is_supported_msr(u32 msr_index)
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{
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struct kvm_msr_list *list;
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bool found = false;
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int i;
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list = kvm_get_msr_index_list();
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for (i = 0; i < list->nmsrs; ++i) {
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if (list->indices[i] == msr_index) {
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found = true;
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break;
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}
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}
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free(list);
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return found;
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}
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int main(int argc, char *argv[])
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{
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struct kvm_cpuid_entry2 *entry;
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bool xss_supported = false;
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struct kvm_vm *vm;
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uint64_t xss_val;
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int i, r;
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/* Create VM */
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vm = vm_create_default(VCPU_ID, 0, 0);
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if (kvm_get_cpuid_max_basic() >= 0xd) {
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entry = kvm_get_supported_cpuid_index(0xd, 1);
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xss_supported = entry && !!(entry->eax & X86_FEATURE_XSAVES);
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}
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if (!xss_supported) {
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print_skip("IA32_XSS is not supported by the vCPU");
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exit(KSFT_SKIP);
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}
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xss_val = vcpu_get_msr(vm, VCPU_ID, MSR_IA32_XSS);
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TEST_ASSERT(xss_val == 0,
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"MSR_IA32_XSS should be initialized to zero\n");
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vcpu_set_msr(vm, VCPU_ID, MSR_IA32_XSS, xss_val);
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/*
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* At present, KVM only supports a guest IA32_XSS value of 0. Verify
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* that trying to set the guest IA32_XSS to an unsupported value fails.
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* Also, in the future when a non-zero value succeeds check that
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* IA32_XSS is in the KVM_GET_MSR_INDEX_LIST.
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*/
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for (i = 0; i < MSR_BITS; ++i) {
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r = _vcpu_set_msr(vm, VCPU_ID, MSR_IA32_XSS, 1ull << i);
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TEST_ASSERT(r == 0 || is_supported_msr(MSR_IA32_XSS),
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"IA32_XSS was able to be set, but was not found in KVM_GET_MSR_INDEX_LIST.\n");
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}
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kvm_vm_free(vm);
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}
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