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KVM: selftests: Harden and comment XSS / KVM_SET_MSRS interaction

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Assert that KVM_SET_MSRS returns '0' or '1' when setting XSS to a
non-zero value.  The ioctl() itself should "succeed", its only the
setting of the XSS MSR that should fail/fault.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2022-06-02 14:12:22 -07:00
committed by Paolo Bonzini
parent c095cb609b
commit 0ce74180f3
1 changed files with 6 additions and 1 deletions
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7
tools/testing/selftests/kvm/x86_64/xss_msr_test.c
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@@ -53,7 +53,12 @@ int main(int argc, char *argv[])
for (i = 0; i < MSR_BITS; ++i) {
r = _vcpu_set_msr(vm, VCPU_ID, MSR_IA32_XSS, 1ull << i);
TEST_ASSERT(r == 0 || xss_in_msr_list,
/*
* Setting a list of MSRs returns the entry that "faulted", or
* the last entry +1 if all MSRs were successfully written.
*/
TEST_ASSERT(!r || r == 1, KVM_IOCTL_ERROR(KVM_SET_MSRS, r));
TEST_ASSERT(r != 1 || xss_in_msr_list,
"IA32_XSS was able to be set, but was not in save/restore list");
}