Re: [Qemu-devel] [PATCH v3 2/2] target/i386: add clflushopt to "Skylake-Server" cpu model

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Dec 19, 2017 at 02:35:20PM -0200, Eduardo Habkost wrote:
> On Tue, Dec 19, 2017 at 11:37:30AM +0800, Haozhong Zhang wrote:
> > CPUID_7_0_EBX_CLFLUSHOPT is missed in current "Skylake-Server" cpu
> > model. Add it to "Skylake-Server" cpu model on pc-i440fx-2.12 and
> > pc-q35-2.12. Keep it disabled in "Skylake-Server" cpu model on older
> > machine types.
> > 
> > Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
> 
> 
> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
> 
> Michael, do you want to merge it through your tree as it needs
> the pc-2.12 patch?


Reviewed-by: Michael S. Tsirkin <mst@redhat.com>


Please merge it ASAP.

> 
> > ---
> >  include/hw/i386/pc.h | 5 +++++
> >  target/i386/cpu.c    | 2 +-
> >  2 files changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> > index 83d825e896..bb49165fe0 100644
> > --- a/include/hw/i386/pc.h
> > +++ b/include/hw/i386/pc.h
> > @@ -323,6 +323,11 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
> >  
> >  #define PC_COMPAT_2_11 \
> >      HW_COMPAT_2_11 \
> > +    {\
> > +        .driver   = "Skylake-Server" "-" TYPE_X86_CPU,\
> > +        .property = "clflushopt",\
> > +        .value    = "off",\
> > +    },
> >  
> >  #define PC_COMPAT_2_10 \
> >      HW_COMPAT_2_10 \
> > diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> > index 82603e3130..54574fa232 100644
> > --- a/target/i386/cpu.c
> > +++ b/target/i386/cpu.c
> > @@ -1376,7 +1376,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
> >              CPUID_7_0_EBX_SMAP | CPUID_7_0_EBX_MPX | CPUID_7_0_EBX_CLWB |
> >              CPUID_7_0_EBX_AVX512F | CPUID_7_0_EBX_AVX512DQ |
> >              CPUID_7_0_EBX_AVX512BW | CPUID_7_0_EBX_AVX512CD |
> > -            CPUID_7_0_EBX_AVX512VL,
> > +            CPUID_7_0_EBX_AVX512VL | CPUID_7_0_EBX_CLFLUSHOPT,
> >          /* Missing: XSAVES (not supported by some Linux versions,
> >           * including v4.1 to v4.12).
> >           * KVM doesn't yet expose any XSAVES state save component,
> > -- 
> > 2.14.1
> > 
> > 
> 
> -- 
> Eduardo