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Date:   Wed, 16 Dec 2020 10:01:29 +0800
From:   Yang Zhong <>
Subject: [PATCH 2/2] KVM: Expose AVX_VNNI instruction to guset

Expose AVX (VEX-encoded) versions of the Vector Neural Network
Instructions to guest.

The bit definition:

The following instructions are available when this feature is
present in the guest.
  1. VPDPBUS: Multiply and Add Unsigned and Signed Bytes
  2. VPDPBUSDS: Multiply and Add Unsigned and Signed Bytes with Saturation
  3. VPDPWSSD: Multiply and Add Signed Word Integers
  4. VPDPWSSDS: Multiply and Add Signed Integers with Saturation

This instruction is currently documented in the latest "extensions"
manual (ISE). It will appear in the "main" manual (SDM) in the future.

Signed-off-by: Yang Zhong <>
Reviewed-by: Tony Luck <>
 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..4229b67f0a8d 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -433,7 +433,7 @@ void kvm_set_cpu_caps(void)
-		F(AVX512_BF16)
+		F(AVX_VNNI) | F(AVX512_BF16)

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