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Re: [Qemu-devel] [PATCH 0/3] x86/cpu: Enable a few new cpu features
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 0/3] x86/cpu: Enable a few new cpu features |
Date: |
Mon, 16 Jul 2018 16:59:15 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 |
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(-)
>