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Message-Id: <20230110055204.3227669-8-yian.chen@intel.com>
Date: Mon, 9 Jan 2023 21:52:04 -0800
From: Yian Chen <yian.chen@...el.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org,
Andy Lutomirski <luto@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Ravi Shankar <ravi.v.shankar@...el.com>,
Tony Luck <tony.luck@...el.com>,
Sohil Mehta <sohil.mehta@...el.com>,
Paul Lai <paul.c.lai@...el.com>,
Yian Chen <yian.chen@...el.com>
Subject: [PATCH 7/7] x86/kvm: Expose LASS feature to VM guest
From: Paul Lai <paul.c.lai@...el.com>
Expose LASS feature which is defined in the CPUID.7.1.EAX
bit and enabled via the CR4 bit for VM guest.
Signed-off-by: Paul Lai <paul.c.lai@...el.com>
Signed-off-by: Yian Chen <yian.chen@...el.com>
Reviewed-by: Tony Luck <tony.luck@...el.com>
---
arch/x86/include/asm/kvm_host.h | 3 ++-
arch/x86/kvm/cpuid.c | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f35f1ff4427b..bd39f45e9b5a 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -125,7 +125,8 @@
| X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR | X86_CR4_PCIDE \
| X86_CR4_OSXSAVE | X86_CR4_SMEP | X86_CR4_FSGSBASE \
| X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_VMXE \
- | X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP))
+ | X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP \
+ | X86_CR4_LASS))
#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index b14653b61470..e0f53f85f5ae 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -664,7 +664,7 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_mask(CPUID_7_1_EAX,
F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) |
- F(AVX_IFMA)
+ F(AVX_IFMA) | F(LASS)
);
kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX,
--
2.34.1
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