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KVM: x86: Advertise and enable LAM (user and supervisor) 

Upstream commit: 703d794cb8cb28c07b22c1c845f5c4d4c419aff7
Conflict: none

LAM is enumerated by CPUID.7.1:EAX.LAM[bit 26]. Advertise the feature to
userspace and enable it as the final step after the LAM virtualization
support for supervisor and user pointers.

SGX LAM support is not advertised yet. SGX LAM support is enumerated in
SGX's own CPUID and there's no hard requirement that it must be supported
when LAM is reported in CPUID leaf 0x7.

Intel-SIG: commit 703d794cb8cb KVM: x86: Advertise and enable LAM (user
and supervisor)
Backport KVM Linear Address Masking (LAM) support.

Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Jingqi Liu <jingqi.liu@intel.com>
Reviewed-by: Chao Gao <chao.gao@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Tested-by: Xuelian Guo <xuelian.guo@intel.com>
Link: https://lore.kernel.org/r/20230913124227.12574-13-binbin.wu@linux.intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
[ Zhiquan Li: amend commit log ]
Signed-off-by: Zhiquan Li <zhiquan1.li@intel.com>
This commit is contained in:
Robert Hoo 2023-09-13 20:42:23 +08:00 committed by Zhiquan Li
parent d3361ddcf3
commit fc5e0c552e
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/cpuid.c
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@ -680,7 +680,7 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_mask(CPUID_7_1_EAX,
F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) |
F(FZRM) | F(FSRS) | F(FSRC) |
F(AMX_FP16) | F(AVX_IFMA)
F(AMX_FP16) | F(AVX_IFMA) | F(LAM)
);
kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX,