diff mbox series

[v4,3/7] x86/cpu: Make X86_FEATURE_LFENCE_RDTSC a scattered feature bit

Message ID 20221201015003.295769-4-kim.phillips@amd.com (mailing list archive)
State New, archived
Headers show
Series x86/cpu, kvm: Support AMD Automatic IBRS | expand

Commit Message

Kim Phillips Dec. 1, 2022, 1:49 a.m. UTC 
It's a part of the CPUID 0x80000021 leaf, and this allows us to
group this and other CPUID 0x80000021 EAX feature bits to being
propagated via kvm_set_cpu_caps() instead of open-coding them in
__do_cpuid_func().

Unlike the other CPUID 0x80000021 EAX feature bits,
X86_FEATURE_LFENCE_RDTSC already had an entry in cpufeatures.h.

Signed-off-by: Kim Phillips <kim.phillips@amd.com>
---
 arch/x86/kernel/cpu/scattered.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index d0734cc19d37..caa03466cd9e 100644
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -46,6 +46,7 @@  static const struct cpuid_bit cpuid_bits[] = {
 	{ X86_FEATURE_PROC_FEEDBACK,    CPUID_EDX, 11, 0x80000007, 0 },
 	{ X86_FEATURE_MBA,		CPUID_EBX,  6, 0x80000008, 0 },
 	{ X86_FEATURE_NO_NESTED_DATA_BP,CPUID_EAX,  0, 0x80000021, 0 },
+	{ X86_FEATURE_LFENCE_RDTSC,	CPUID_EAX,  2, 0x80000021, 0 },
 	{ X86_FEATURE_NULL_SEL_CLR_BASE,CPUID_EAX,  6, 0x80000021, 0 },
 	{ X86_FEATURE_PERFMON_V2,	CPUID_EAX,  0, 0x80000022, 0 },
 	{ X86_FEATURE_AMD_LBR_V2,	CPUID_EAX,  1, 0x80000022, 0 },