Re: [Qemu-devel] [PATCH 0/3] x86/cpu: Enable a few new cpu features

[Liu, Jingqi]

Hi Paolo & Eduardo,

Do you have any comments for the series ?
Thanks

On 7/16/2018 10:59 PM, Paolo Bonzini wrote:
> On 10/07/2018 10:57, Jingqi Liu wrote:
> > Enable a few new cpu features including UMONITOR, UMWAIT, TPAUSE,
> > MOVDIRI and MOVDIR64B.
> >
> > UMONITOR, UMWAIT, and TPAUSE are a set of user wait instructions.
> > MOVDIRI moves doubleword or quadword from register to memory through
> > direct store.
> > MOVDIR64B moves 64-bytes as direct-store with 64-bytes write atomicity.
> Do you have corresponding KVM changes?
>
> Paolo
>
> > The bits definition:
> > CPUID.(EAX=7,ECX=0):ECX[bit 05] WAITPKG
> > CPUID.(EAX=7,ECX=0):ECX[bit 27] MOVDIRI
> > CPUID.(EAX=7,ECX=0):ECX[bit 28] MOVDIR64B
> >
> > The release document ref below link:
> > https://software.intel.com/sites/default/files/managed/c5/15/\
> > architecture-instruction-set-extensions-programming-reference.pdf
> >
> > Jingqi Liu (3):
> >    x86/cpu: Enable UMONITOR/UMWAIT/TPAUSE cpu features
> >    x86/cpu: Enable MOVDIRI cpu feature
> >    x86/cpu: Enable MOVDIR64B cpu feature
> >
> >   target/i386/cpu.c | 6 +++---
> >   target/i386/cpu.h | 3 +++
> >   2 files changed, 6 insertions(+), 3 deletions(-)