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

[Paolo Bonzini]

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(-)
>