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KVM: SVM: Fix build error when using -Werror=unused-but-set-variable 

Commit 916e3e5f26 ("KVM: SVM: Do not use user return MSR support for
virtualized TSC_AUX") introduced a local variable used for the rdmsr()
function for the high 32-bits of the MSR value. This variable is not used
after being set and triggers a warning or error, when treating warnings
as errors, when the unused-but-set-variable flag is set. Mark this
variable as __maybe_unused to fix this.

Fixes: 916e3e5f26 ("KVM: SVM: Do not use user return MSR support for virtualized TSC_AUX")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <0da9874b6e9fcbaaa5edeb345d7e2a7c859fc818.1696271334.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
pull/806/head
Tom Lendacky 2023-10-02 13:28:54 -05:00 committed by Paolo Bonzini
parent 3fdc6087df
commit 3e93467346
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/svm/svm.c
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@ -691,7 +691,7 @@ static int svm_hardware_enable(void)
*/ */
if (boot_cpu_has(X86_FEATURE_V_TSC_AUX)) { if (boot_cpu_has(X86_FEATURE_V_TSC_AUX)) {
struct sev_es_save_area *hostsa; struct sev_es_save_area *hostsa;
u32 msr_hi; u32 __maybe_unused msr_hi;
hostsa = (struct sev_es_save_area *)(page_address(sd->save_area) + 0x400); hostsa = (struct sev_es_save_area *)(page_address(sd->save_area) + 0x400);