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KVM: selftests: Verify MSRs are (not) in save/restore list when (un)supported

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Add a check in the MSRs test to verify that KVM's reported support for
MSRs with feature bits is consistent between KVM's MSR save/restore lists
and KVM's supported CPUID.

To deal with Intel's wonderful decision to bundle IBT and SHSTK under CET,
track the "second" feature to avoid false failures when running on a CPU
with only one of IBT or SHSTK.

Reviewed-by: Chao Gao <chao.gao@intel.com>
Link: https://lore.kernel.org/r/20250919223258.1604852-51-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-09-19 15:32:57 -07:00
parent 3469fd203b
commit 947ab90c91
1 changed files with 18 additions and 1 deletions
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19
tools/testing/selftests/kvm/x86/msrs_test.c
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@ -444,12 +444,29 @@ static void test_msrs(void)
}
for (idx = 0; idx < ARRAY_SIZE(__msrs); idx++) {
if (msrs[idx].is_kvm_defined) {
struct kvm_msr *msr = &msrs[idx];
if (msr->is_kvm_defined) {
for (i = 0; i < NR_VCPUS; i++)
host_test_kvm_reg(vcpus[i]);
continue;
}
/*
* Verify KVM_GET_SUPPORTED_CPUID and KVM_GET_MSR_INDEX_LIST
* are consistent with respect to MSRs whose existence is
* enumerated via CPUID. Skip the check for FS/GS.base MSRs,
* as they aren't reported in the save/restore list since their
* state is managed via SREGS.
*/
TEST_ASSERT(msr->index == MSR_FS_BASE || msr->index == MSR_GS_BASE ||
kvm_msr_is_in_save_restore_list(msr->index) ==
(kvm_cpu_has(msr->feature) || kvm_cpu_has(msr->feature2)),
"%s %s in save/restore list, but %s according to CPUID", msr->name,
kvm_msr_is_in_save_restore_list(msr->index) ? "is" : "isn't",
(kvm_cpu_has(msr->feature) || kvm_cpu_has(msr->feature2)) ?
"supported" : "unsupported");
sync_global_to_guest(vm, idx);
vcpus_run(vcpus, NR_VCPUS);