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[v2,22/25] KVM: x86: Allow FRED/LKGS/WRMSRNS to be exposed to guests

Message ID 20240207172646.3981-23-xin3.li@intel.com (mailing list archive)
State New, archived
Headers show
Series Enable FRED with KVM VMX | expand

Commit Message

Li, Xin3 Feb. 7, 2024, 5:26 p.m. UTC 
Allow FRED/LKGS/WRMSRNS to be exposed to guests, thus a guest OS could see
these features when the guest is configured with FRED/LKGS/WRMSRNS in Qemu.

A qemu patch is required to expose FRED/LKGS/WRMSRNS to KVM guests.

Signed-off-by: Xin Li <xin3.li@intel.com>
Tested-by: Shan Kang <shan.kang@intel.com>
---
 arch/x86/kvm/cpuid.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Sean Christopherson June 13, 2024, 6:31 p.m. UTC | #1 
On Wed, Feb 07, 2024, Xin Li wrote:
> Allow FRED/LKGS/WRMSRNS to be exposed to guests, thus a guest OS could see
> these features when the guest is configured with FRED/LKGS/WRMSRNS in Qemu.

(a) please describe what these features are, and (b) one patch per feature unless
they _must_ be bundled together, in which case there needs to be code to enforce
that.

> A qemu patch is required to expose FRED/LKGS/WRMSRNS to KVM guests.

Omit this, QEMU is not the only VMM that uses KVM.
diff mbox series

Patch

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index adba49afb5fe..afc1316d78ad 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -676,8 +676,8 @@  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(LAM)
+		F(FZRM) | F(FSRS) | F(FSRC) | F(FRED) | F(LKGS) |
+		F(WRMSRNS) | F(AMX_FP16) | F(AVX_IFMA) | F(LAM)
 	);
 
 	kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX,