linux-kernel - RE: [PATCH v2 1/2] X86/Hyper-V: Add Guest IDLE MSR support

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Message-ID: <CY4PR21MB0773B209A6BE8DC3463F7A32DC120@CY4PR21MB0773.namprd21.prod.outlook.com>
Date:   Fri, 21 Sep 2018 16:52:52 +0000
From:   "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>
To:     Yi Sun <yi.y.sun@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "x86@...nel.org" <x86@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "chao.p.peng@...el.com" <chao.p.peng@...el.com>,
        "chao.gao@...el.com" <chao.gao@...el.com>,
        "isaku.yamahata@...el.com" <isaku.yamahata@...el.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>
Subject: RE: [PATCH v2 1/2] X86/Hyper-V: Add Guest IDLE MSR support

From: Yi Sun <yi.y.sun@...ux.intel.com>  Sent: Friday, September 21, 2018 12:25 AM
> 
> Hyper-V may expose a HV_X64_MSR_GUEST_IDLE MSR. We can read
> HYPERV_CPUID_FEATURES eax to check it. Read this MSR can
> trigger the guest's transition to the idle power state which
> can be exited by an IPI even if IF flag is disabled.
> 
> Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
> Cc: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: Stephen Hemminger <sthemmin@...rosoft.com>
> Signed-off-by: Yi Sun <yi.y.sun@...ux.intel.com>
> ---
>  arch/x86/include/asm/hyperv-tlfs.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>