57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
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// 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 MSR_BITS 64
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int main(int argc, char *argv[])
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{
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bool xss_in_msr_list;
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struct kvm_vm *vm;
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struct kvm_vcpu *vcpu;
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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_with_one_vcpu(&vcpu, NULL);
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TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XSAVES));
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xss_val = vcpu_get_msr(vcpu, 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(vcpu, 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 list of MSRs to save/restore.
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*/
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xss_in_msr_list = kvm_msr_is_in_save_restore_list(MSR_IA32_XSS);
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for (i = 0; i < MSR_BITS; ++i) {
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r = _vcpu_set_msr(vcpu, MSR_IA32_XSS, 1ull << i);
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/*
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* Setting a list of MSRs returns the entry that "faulted", or
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* the last entry +1 if all MSRs were successfully written.
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*/
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TEST_ASSERT(!r || r == 1, KVM_IOCTL_ERROR(KVM_SET_MSRS, r));
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TEST_ASSERT(r != 1 || xss_in_msr_list,
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"IA32_XSS was able to be set, but was not in save/restore list");
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}
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kvm_vm_free(vm);
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}
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