linux-kernel - [PATCH v4 15/17] kvm: x86: Report CORE_CAPABILITY on GET_SUPPORTED

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Date:   Fri,  1 Mar 2019 18:45:09 -0800
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "H Peter Anvin" <hpa@...or.com>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        "Dave Hansen" <dave.hansen@...el.com>,
        "Ashok Raj" <ashok.raj@...el.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>,
        "Xiaoyao Li " <xiaoyao.li@...el.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, kvm@...r.kernel.org,
        Xiaoyao Li <xiaoyao.li@...ux.intel.com>
Subject: [PATCH v4 15/17] kvm: x86: Report CORE_CAPABILITY on GET_SUPPORTED_CPUID

From: Xiaoyao Li <xiaoyao.li@...ux.intel.com>

In the latest Intel SDM, CPUID.(EAX=7H,ECX=0):EDX[30] will enumerate
the presence of the IA32_CORE_CAPABILITY MSR.

Update GET_SUPPORTED_CPUID to expose this feature bit to user space, so
that user space know this bit can be enabled in CPUID.

Signed-off-by: Xiaoyao Li <xiaoyao.li@...ux.intel.com>
---
 arch/x86/kvm/cpuid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index c07958b59f50..e0e17b9c65da 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -410,7 +410,8 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 	/* cpuid 7.0.edx*/
 	const u32 kvm_cpuid_7_0_edx_x86_features =
 		F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) |
-		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP);
+		F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(CORE_CAPABILITY) |
+		F(INTEL_STIBP);
 
 	/* all calls to cpuid_count() should be made on the same cpu */
 	get_cpu();
-- 
2.7.4