[tip: x86/bugs] KVM: x86: Advertise SRSO_USER_KERNEL_NO to userspace

[tip-bot2 for Borislav Petkov (AMD)]

The following commit has been merged into the x86/bugs branch of tip:

Commit-ID:     716f86b523d8ec3c17015ee0b03135c7aa6f2f08
Gitweb:        https://git.kernel.org/tip/716f86b523d8ec3c17015ee0b03135c7aa6f2f08
Author:        Borislav Petkov (AMD) <bp@xxxxxxxxx>
AuthorDate:    Wed, 13 Nov 2024 13:28:33 +01:00
Committer:     Borislav Petkov (AMD) <bp@xxxxxxxxx>
CommitterDate: Mon, 30 Dec 2024 17:56:00 +01:00

KVM: x86: Advertise SRSO_USER_KERNEL_NO to userspace

SRSO_USER_KERNEL_NO denotes whether the CPU is affected by SRSO across
user/kernel boundaries. Advertise it to guest userspace.

Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Reviewed-by: Nikolay Borisov <nik.borisov@xxxxxxxx>
Link: https://lore.kernel.org/r/20241202120416.6054-3-bp@xxxxxxxxxx
---
 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 ae0b438..f7e2229 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -821,7 +821,7 @@ void kvm_set_cpu_caps(void)
 	kvm_cpu_cap_mask(CPUID_8000_0021_EAX,
 		F(NO_NESTED_DATA_BP) | F(LFENCE_RDTSC) | 0 /* SmmPgCfgLock */ |
 		F(NULL_SEL_CLR_BASE) | F(AUTOIBRS) | 0 /* PrefetchCtlMsr */ |
-		F(WRMSR_XX_BASE_NS)
+		F(WRMSR_XX_BASE_NS) | F(SRSO_USER_KERNEL_NO)
 	);
 
 	kvm_cpu_cap_check_and_set(X86_FEATURE_SBPB);