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From: | Liu, Jingqi |
Subject: | Re: [Qemu-devel] [PATCH 0/3] x86/cpu: Enable a few new cpu features |
Date: | Tue, 17 Jul 2018 09:12:20 +0800 |
User-agent: | Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.0 |
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?
Yes, the corresponding links are listed as below. https://www.spinics.net/lists/kvm/msg171563.html https://www.spinics.net/lists/kernel/msg2850965.html The patches had been sent for your review also. Thanks Jingqi Liu
PaoloThe 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(-)
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