Yes. The corresponding patch in KVM refers to the following link: https://www.spinics.net/lists/kernel/msg2792864.html Thanks.
-----Original Message----- From: Eduardo Habkost [mailto:ehabk...@redhat.com] Sent: Thursday, May 3, 2018 11:05 AM To: Liu, Jingqi <jingqi....@intel.com> Cc: qemu-devel@nongnu.org; pbonz...@redhat.com; r...@twiddle.net Subject: Re: [PATCH] x86/cpu: Enable CLDEMOTE(Demote Cache Line) cpu feature On Fri, May 04, 2018 at 11:57:33AM +0800, Jingqi Liu wrote: > The CLDEMOTE instruction hints to hardware that the cache line that > contains the linear address should be moved("demoted") from the > cache(s) closest to the processor core to a level more distant from > the processor core. This may accelerate subsequent accesses to the > line by other cores in the same coherence domain, especially if the > line was written by the core that demotes the line. > > Intel Snow Ridge has added new cpu feature, CLDEMOTE. > The new cpu feature needs to be exposed to guest VM. > > The bit definition: > CPUID.(EAX=7,ECX=0):ECX[bit 25] CLDEMOTE > > The release document ref below link: > https://software.intel.com/sites/default/files/managed/c5/15/\ > architecture-instruction-set-extensions-programming-reference.pdf > > Signed-off-by: Jingqi Liu <jingqi....@intel.com> Thanks. Do you have a pointer to the corresponding GET_SUPPORTED_CPUID patch in KVM? -- Eduardo
