Enumerate AVX Vector Neural Network instructions
Add AVX version of the Vector Neural Network (VNNI) Instructions. A processor supports AVX VNNI instructions if CPUID.0x07.0x1:EAX[4] is present. The following instructions are available when this feature is present. 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 The only in-kernel usage of this is kvm passthrough. The CPU feature flag is shown as "avx_vnni" in /proc/cpuinfo. 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: NKyung Min Park <kyung.min.park@intel.com> Signed-off-by: NYang Zhong <yang.zhong@intel.com> Reviewed-by: NTony Luck <tony.luck@intel.com> Message-Id: <20210105004909.42000-2-yang.zhong@intel.com> Acked-by: NBorislav Petkov <bp@suse.de> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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