On 3/20/2023 4:57 PM, Chao Gao wrote:
On Sun, Mar 19, 2023 at 04:49:27PM +0800, Binbin Wu wrote:
From: Robert Hoo <robert.hu@xxxxxxxxxxxxxxx>
LAM feature is enumerated by CPUID.7.1:EAX.LAM[bit 26].
Expose the feature to guest as the final step after the following
Nit: s/guest/userspace/. Because it is QEMU that decides whther or not
to expose a feature to guests.
OK. Will update it and thanks for review-by
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.
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>
---
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 8f8edeaf8177..13840ef897c7 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -670,7 +670,7 @@ 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
