linux-kernel - [PATCH RFC 1/7] kvm: x86: Expose XFD CPUID to guest

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Message-Id: <20210207154256.52850-2-jing2.liu@linux.intel.com>
Date:   Sun,  7 Feb 2021 10:42:50 -0500
From:   Jing Liu <jing2.liu@...ux.intel.com>
To:     pbonzini@...hat.com, seanjc@...gle.com, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jing2.liu@...el.com
Subject: [PATCH RFC 1/7] kvm: x86: Expose XFD CPUID to guest

Intel's Extended Feature Disable (XFD) feature is an extension
to the XSAVE feature that allows an operating system to enable
a feature while preventing specific user threads from using
the feature. A processor that supports XFD enumerates
CPUID.(EAX=0DH,ECX=1):EAX[4] as 1.

Signed-off-by: Jing Liu <jing2.liu@...ux.intel.com>
---
 arch/x86/kvm/cpuid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 83637a2ff605..04a73c395c71 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -437,7 +437,7 @@ void kvm_set_cpu_caps(void)
 	);
 
 	kvm_cpu_cap_mask(CPUID_D_1_EAX,
-		F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | F(XSAVES)
+		F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | F(XSAVES) | F(XFD)
 	);
 
 	kvm_cpu_cap_mask(CPUID_8000_0001_ECX,
-- 
2.18.4