kvm: x86: Add CPUID support for Intel AMX

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Extend CPUID emulation to support XFD, AMX_TILE, AMX_INT8 and
AMX_BF16. Adding those bits into kvm_cpu_caps finally activates all
previous logics in this series.

Hide XFD on 32bit host kernels. Otherwise it leads to a weird situation
where KVM tells userspace to migrate MSR_IA32_XFD and then rejects
attempts to read/write the MSR.

Signed-off-by: Jing Liu <jing2.liu@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20220105123532.12586-17-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Jing Liu 2022-01-05 04:35:27 -08:00 • committed by Paolo Bonzini

parent 86aff7a479

commit 690a757d61

2 changed files with 27 additions and 2 deletions

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2

arch/x86/include/asm/cpufeatures.h

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27

arch/x86/kvm/cpuid.c

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