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From: Andre Przywara on 16 Mar 2010 18:10
The AMD SSE5 feature set as-it has been replaced by some extensions
to the AVX instruction set. Thus the bit formerly advertised as SSE5
is re-used for one of these extensions (XOP).
Replace the name and add another one described in the new AMD APM6
manual (doc #43479, p. 25). Although this changes the /proc/cpuinfo
output, it is not user visible, as there are no CPUs (yet) having
either of these features.
Additionally as long as AVX is not sane for KVM to pass-through,
XOP and FMA4 are neither.

Signed-off-by: Andre Przywara <andre.przywara(a)amd.com>
---
arch/x86/include/asm/cpufeature.h | 3 ++-
arch/x86/kvm/x86.c | 4 ++--
2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 0cd82d0..1af4708 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -150,9 +150,10 @@
#define X86_FEATURE_3DNOWPREFETCH (6*32+ 8) /* 3DNow prefetch instructions */
#define X86_FEATURE_OSVW (6*32+ 9) /* OS Visible Workaround */
#define X86_FEATURE_IBS (6*32+10) /* Instruction Based Sampling */
-#define X86_FEATURE_SSE5 (6*32+11) /* SSE-5 */
+#define X86_FEATURE_XOP (6*32+11) /* extended AVX instructions */
#define X86_FEATURE_SKINIT (6*32+12) /* SKINIT/STGI instructions */
#define X86_FEATURE_WDT (6*32+13) /* Watchdog timer */
+#define X86_FEATURE_FMA4 (6*32+16) /* 4 operands MAC instructions */
#define X86_FEATURE_NODEID_MSR (6*32+19) /* NodeId MSR */

/*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e46282a..67541a6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1859,8 +1859,8 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
const u32 kvm_supported_word6_x86_features =
F(LAHF_LM) | F(CMP_LEGACY) | F(SVM) | 0 /* ExtApicSpace */ |
F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
- F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(SSE5) |
- 0 /* SKINIT */ | 0 /* WDT */;
+ F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | 0 /* XOP */ |
+ 0 /* SKINIT, WDT */ | 0 /* FMA4 */;

/* all calls to cpuid_count() should be made on the same cpu */
get_cpu();
--
1.6.4


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