> -----Original Message----- > From: Qemu-devel > [mailto:qemu-devel-bounces+arei.gonglei=huawei....@nongnu.org] On > Behalf Of Eduardo Habkost > Sent: Tuesday, January 09, 2018 11:45 PM > To: qemu-devel@nongnu.org > Cc: Paolo Bonzini > Subject: [Qemu-devel] [PATCH 3/7] i386: Add spec-ctrl CPUID bit > > Add the feature name and a CPUID_7_0_EDX_SPEC_CTRL macro. > > Signed-off-by: Eduardo Habkost <ehabk...@redhat.com> > --- > target/i386/cpu.h | 1 + > target/i386/cpu.c | 2 +- > 2 files changed, 2 insertions(+), 1 deletion(-) > > diff --git a/target/i386/cpu.h b/target/i386/cpu.h > index 07f47997d6..de387c1311 100644 > --- a/target/i386/cpu.h > +++ b/target/i386/cpu.h > @@ -667,6 +667,7 @@ typedef uint32_t > FeatureWordArray[FEATURE_WORDS]; > > #define CPUID_7_0_EDX_AVX512_4VNNIW (1U << 2) /* AVX512 Neural > Network Instructions */ > #define CPUID_7_0_EDX_AVX512_4FMAPS (1U << 3) /* AVX512 Multiply > Accumulation Single Precision */ > +#define CPUID_7_0_EDX_SPEC_CTRL (1U << 26) /* Speculation Control > */ > > #define CPUID_XSAVE_XSAVEOPT (1U << 0) > #define CPUID_XSAVE_XSAVEC (1U << 1) > diff --git a/target/i386/cpu.c b/target/i386/cpu.c > index 9f4f949899..1be1642eb2 100644 > --- a/target/i386/cpu.c > +++ b/target/i386/cpu.c > @@ -459,7 +459,7 @@ static FeatureWordInfo > feature_word_info[FEATURE_WORDS] = { > NULL, NULL, NULL, NULL, > NULL, NULL, NULL, NULL, > NULL, NULL, NULL, NULL, > - NULL, NULL, NULL, NULL, > + NULL, NULL, "spec-ctrl", NULL, > NULL, NULL, NULL, NULL, > }, > .cpuid_eax = 7, > -- > 2.14.3 > Don't we need to pass-through cupid_7_edx to guest when configuring '-cpu host'? Otherwise how guests use IBPB/IBRS/STIPB capabilities?
Thanks, -Gonglei
