From: Ramakrishna Saripalli <rsaripal@amd.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
<kvm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <rsaripal@amd.com>
Subject: [PATCH 1/1] x86/kvm/svm: Implement support for PSFD
Date: Wed, 7 Apr 2021 14:45:12 -0500 [thread overview]
Message-ID: <20210407194512.6922-1-rsaripal@amd.com> (raw)
From: Ramakrishna Saripalli <rk.saripalli@amd.com>
Expose Predictive Store Forwarding capability to guests.
Guests enable or disable PSF via SPEC_CTRL MSR.
Signed-off-by: Ramakrishna Saripalli <rk.saripalli@amd.com>
---
arch/x86/kvm/cpuid.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 6bd2f8b830e4..9c4af0fef6d7 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -448,6 +448,8 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_set(X86_FEATURE_INTEL_STIBP);
if (boot_cpu_has(X86_FEATURE_AMD_SSBD))
kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL_SSBD);
+ if (boot_cpu_has(X86_FEATURE_AMD_PSFD))
+ kvm_cpu_cap_set(X86_FEATURE_AMD_PSFD);
kvm_cpu_cap_mask(CPUID_7_1_EAX,
F(AVX_VNNI) | F(AVX512_BF16)
@@ -482,7 +484,7 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_mask(CPUID_8000_0008_EBX,
F(CLZERO) | F(XSAVEERPTR) |
F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) |
- F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON)
+ F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON) | F(AMD_PSFD)
);
/*
--
2.25.1
next reply other threads:[~2021-04-07 19:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 19:45 Ramakrishna Saripalli [this message]
2021-04-07 20:03 ` [PATCH 1/1] x86/kvm/svm: Implement support for PSFD Sean Christopherson
2021-04-08 17:19 ` Tom Lendacky
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