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Message-Id: <20221110015252.202566-5-jiaxi.chen@linux.intel.com>
Date: Thu, 10 Nov 2022 09:52:49 +0800
From: Jiaxi Chen <jiaxi.chen@...ux.intel.com>
To: kvm@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
seanjc@...gle.com, pbonzini@...hat.com, ndesaulniers@...gle.com,
alexandre.belloni@...tlin.com, peterz@...radead.org,
jpoimboe@...nel.org, chang.seok.bae@...el.com,
pawan.kumar.gupta@...ux.intel.com, babu.moger@....com,
jmattson@...gle.com, sandipan.das@....com, tony.luck@...el.com,
sathyanarayanan.kuppuswamy@...ux.intel.com, fenghua.yu@...el.com,
keescook@...omium.org, nathan@...nel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 4/7] x86: KVM: Advertise AVX-IFMA CPUID to user space
AVX-IFMA is a new instruction in the latest Intel platform Sierra
Forest. This instruction packed multiplies unsigned 52-bit integers and
adds the low/high 52-bit products to Qword Accumulators.
The bit definition:
CPUID.(EAX=7,ECX=1):EAX[bit 23]
This CPUID is exposed to user space. Besides, there is no other VMX
control for this instruction.
Signed-off-by: Jiaxi Chen <jiaxi.chen@...ux.intel.com>
---
arch/x86/kvm/cpuid.c | 3 ++-
arch/x86/kvm/reverse_cpuid.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 19ef02d5b11b..e84c6216a72c 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -657,7 +657,8 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL_SSBD);
kvm_cpu_cap_init_scattered(CPUID_7_1_EAX,
- F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16)
+ F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) |
+ F(AVX_IFMA)
);
kvm_cpu_cap_mask(CPUID_D_1_EAX,
diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h
index 05fd43ebd226..954c0ceb1e90 100644
--- a/arch/x86/kvm/reverse_cpuid.h
+++ b/arch/x86/kvm/reverse_cpuid.h
@@ -30,6 +30,7 @@ enum kvm_only_cpuid_leafs {
#define X86_FEATURE_AVX512_BF16 KVM_X86_FEATURE(CPUID_7_1_EAX, 5)
#define X86_FEATURE_CMPCCXADD KVM_X86_FEATURE(CPUID_7_1_EAX, 7)
#define X86_FEATURE_AMX_FP16 KVM_X86_FEATURE(CPUID_7_1_EAX, 21)
+#define X86_FEATURE_AVX_IFMA KVM_X86_FEATURE(CPUID_7_1_EAX, 23)
struct cpuid_reg {
u32 function;
--
2.27.0
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