[PATCH v9 6/6] KVM: x86: Expose LAM feature to userspace VMM

[Binbin Wu]

From: Robert Hoo <robert.hu@xxxxxxxxxxxxxxx>

LAM feature is enumerated by CPUID.7.1:EAX.LAM[bit 26].
Expose the feature to userspace as the final step after the following
supports:
- CR4.LAM_SUP virtualization
- CR3.LAM_U48 and CR3.LAM_U57 virtualization
- Check and untag 64-bit linear address when LAM applies in instruction
  emulations and VMExit handlers.

LAM support in SGX enclave mode needs additional enabling and is not
included in this patch series.

Signed-off-by: Robert Hoo <robert.hu@xxxxxxxxxxxxxxx>
Signed-off-by: Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx>
Reviewed-by: Jingqi Liu <jingqi.liu@xxxxxxxxx>
Reviewed-by: Chao Gao <chao.gao@xxxxxxxxx>
Tested-by: Xuelian Guo <xuelian.guo@xxxxxxxxx>
---
 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 241f554f1764..166243fb5705 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -643,7 +643,7 @@ 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,
-- 
2.25.1