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Subject[PATCH v4 3/3] x86/kvm: Expose AMD Core Perf Extension flag to guests
Date
Expose the AMD Core Perf Extension flag to the guests.

Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
---
arch/x86/kvm/cpuid.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 0099e10..8c95a7c 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -55,6 +55,11 @@ bool kvm_mpx_supported(void)
}
EXPORT_SYMBOL_GPL(kvm_mpx_supported);

+bool perf_ext_supported(void)
+{
+ return boot_cpu_has(X86_FEATURE_PERFCTR_CORE);
+}
+
u64 kvm_supported_xcr0(void)
{
u64 xcr0 = KVM_SUPPORTED_XCR0 & host_xcr0;
@@ -327,6 +332,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0;
unsigned f_mpx = kvm_mpx_supported() ? F(MPX) : 0;
unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0;
+ unsigned f_perfext = perf_ext_supported() ? F(PERFCTR_CORE) : 0;

/* cpuid 1.edx */
const u32 kvm_cpuid_1_edx_x86_features =
@@ -365,7 +371,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
F(3DNOWPREFETCH) | F(OSVW) | 0 /* IBS */ | F(XOP) |
- 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
+ 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM) | f_perfext;

/* cpuid 0xC0000001.edx */
const u32 kvm_cpuid_C000_0001_edx_x86_features =
--
2.7.4
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