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KVM: SVM: Set synthesized TSA CPUID flags

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VERW_CLEAR is supposed to be set only by the hypervisor to denote TSA
mitigation support to a guest. SQ_NO and L1_NO are both synthesizable,
and are going to be set by hw CPUID on future machines.

So keep the kvm_cpu_cap_init_kvm_defined() invocation *and* set them
when synthesized.

This fix is stable-only.

Co-developed-by: Jinpu Wang <jinpu.wang@ionos.com>
Signed-off-by: Jinpu Wang <jinpu.wang@ionos.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Borislav Petkov (AMD) 2025-07-15 21:24:59 +02:00 committed by Greg Kroah-Hartman
parent f004f58d18
commit f3f9deccfc
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/cpuid.c
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@ -822,6 +822,7 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_check_and_set(X86_FEATURE_SBPB);
kvm_cpu_cap_check_and_set(X86_FEATURE_IBPB_BRTYPE);
kvm_cpu_cap_check_and_set(X86_FEATURE_SRSO_NO);
kvm_cpu_cap_check_and_set(X86_FEATURE_VERW_CLEAR);
kvm_cpu_cap_init_kvm_defined(CPUID_8000_0022_EAX,
F(PERFMON_V2)
@ -831,6 +832,9 @@ void kvm_set_cpu_caps(void)
F(TSA_SQ_NO) | F(TSA_L1_NO)
);
kvm_cpu_cap_check_and_set(X86_FEATURE_TSA_SQ_NO);
kvm_cpu_cap_check_and_set(X86_FEATURE_TSA_L1_NO);
/*
* Synthesize "LFENCE is serializing" into the AMD-defined entry in
* KVM's supported CPUID if the feature is reported as supported by the