[PATCH v10 19/28] KVM: x86: Advertise support for FRED
From: Sohil Mehta
Date: Fri Sep 11 2026 - 17:49:42 EST
From: "Xin Li (Intel)" <xin@xxxxxxxxx>
Advertise support for FRED to userspace after changes required to enable
FRED in a KVM guest are in place.
Signed-off-by: Xin Li (Intel) <xin@xxxxxxxxx>
Signed-off-by: Sohil Mehta <sohil.mehta@xxxxxxxxx>
Reviewed-by: Chao Gao <chao.gao@xxxxxxxxx>
---
v10:
- kvm_cpu_cap_clear(X86_FEATURE_FRED) in svm_set_cpu_caps() (Chao).
---
arch/x86/kvm/cpuid.c | 1 +
arch/x86/kvm/svm/svm.c | 3 +++
2 files changed, 4 insertions(+)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index ddb022cb203a..5682bacdfd32 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -1034,6 +1034,7 @@ void kvm_initialize_cpu_caps(void)
F(FSRS),
F(FSRC),
F(WRMSRNS),
+ X86_64_F(FRED),
X86_64_F(LKGS),
F(AMX_FP16),
F(AVX_IFMA),
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index f254a5ff570d..dd19c7b4e904 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -5518,6 +5518,9 @@ static __init void svm_set_cpu_caps(void)
kvm_cpu_cap_clear(X86_FEATURE_IBT);
+ /* SVM FRED virtualization not implemented yet */
+ kvm_cpu_cap_clear(X86_FEATURE_FRED);
+
/* CPUID 0x80000001 and 0x8000000A (SVM features) */
if (nested) {
kvm_cpu_cap_set(X86_FEATURE_SVM);
--
2.43.0