KVM: x86: Advertise SRSO_USER_KERNEL_NO to userspace

[ Upstream commit 716f86b ]

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) <[email protected]>
Reviewed-by: Nikolay Borisov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Harshit Mogalapalli <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: bp3tk0v

arch/x86/kvm/cpuid.c

@@ -816,7 +816,7 @@ void kvm_set_cpu_caps(void)
 		F(NO_NESTED_DATA_BP) | F(LFENCE_RDTSC) | 0 /* SmmPgCfgLock */ |
 		F(VERW_CLEAR) |
 		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);