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Message-ID: <09D68D4CF52CAF489B702DEBDD12D3D35269A68D@SHSMSX103.ccr.corp.intel.com>
Date: Tue, 8 May 2018 02:03:14 +0000
From: "Liu, Jingqi" <jingqi.liu@...el.com>
To: Paolo Bonzini <pbonzini@...hat.com>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC: "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"mingo@...hat.com" <mingo@...hat.com>,
"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Wang, Wei W" <wei.w.wang@...el.com>
Subject: RE: [PATCH] KVM: x86: Expose CLDEMOTE CPU feature to guest VM
Hi Paolo,
Thanks.
Will you help to modify the Signed-off-by chain ?
Or do I need to submit the second version after modifying the Signed-off-by chain ?
Thanks,
Jingqi Liu
-----Original Message-----
From: Paolo Bonzini [mailto:pbonzini@...hat.com]
Sent: Tuesday, May 8, 2018 12:30 AM
To: Liu, Jingqi <jingqi.liu@...el.com>; kvm@...r.kernel.org
Cc: rkrcmar@...hat.com; tglx@...utronix.de; mingo@...hat.com; hpa@...or.com; x86@...nel.org; linux-kernel@...r.kernel.org; Wang, Wei W <wei.w.wang@...el.com>
Subject: Re: [PATCH] KVM: x86: Expose CLDEMOTE CPU feature to guest VM
On 04/05/2018 05:55, 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.
>
> This patch exposes the cldemote feature to the guest.
>
> The release document ref below link:
> https://software.intel.com/sites/default/files/managed/c5/15/\
> architecture-instruction-set-extensions-programming-reference.pdf
> This patch has a dependency on https://lkml.org/lkml/2018/4/23/928
>
> Signed-off-by: Jingqi Liu <jingqi.liu@...el.com>
> Signed-off-by: Wei Wang <wei.w.wang@...el.com>
Thanks. Note that the Signed-off-by chain for the patch looks strange, the submitter should be the last (because it is a chain).
In the meanwhile, Ingo, Thomas, would it be possible to get a topic branch for that patch ("[PATCH] x86/cpufeatures: Enumerate cldemote instruction")?
Thanks,
Paolo
> ---
> arch/x86/kvm/cpuid.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index
> 82055b9..72d8c49 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -403,7 +403,8 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
> const u32 kvm_cpuid_7_0_ecx_x86_features =
> F(AVX512VBMI) | F(LA57) | F(PKU) | 0 /*OSPKE*/ |
> F(AVX512_VPOPCNTDQ) | F(UMIP) | F(AVX512_VBMI2) | F(GFNI) |
> - F(VAES) | F(VPCLMULQDQ) | F(AVX512_VNNI) | F(AVX512_BITALG);
> + F(VAES) | F(VPCLMULQDQ) | F(AVX512_VNNI) | F(AVX512_BITALG) |
> + F(CLDEMOTE);
>
> /* cpuid 7.0.edx*/
> const u32 kvm_cpuid_7_0_edx_x86_features =
>
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