linux-kernel - Re: [PATCH v3] x86/Hyper-V: Support for free page reporting

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Message-ID: <20210126171121.ujxojhmkjhuilry6@liuwe-devbox-debian-v2>
Date:   Tue, 26 Jan 2021 17:11:21 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Sunil Muthuswamy <sunilmut@...rosoft.com>
Cc:     Matheus Castello <matheus@...tello.eng.br>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <liuwe@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, vkuznets <vkuznets@...hat.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] x86/Hyper-V: Support for free page reporting

On Wed, Jan 06, 2021 at 11:20:33PM +0000, Sunil Muthuswamy wrote:
> Linux has support for free page reporting now (36e66c554b5c) for
> virtualized environment. On Hyper-V when virtually backed VMs are
> configured, Hyper-V will advertise cold memory discard capability,
> when supported. This patch adds the support to hook into the free
> page reporting infrastructure and leverage the Hyper-V cold memory
> discard hint hypercall to report/free these pages back to the host.
> 
> Signed-off-by: Sunil Muthuswamy <sunilmut@...rosoft.com>
> Tested-by: Matheus Castello <matheus@...tello.eng.br>

Reviewed-by: Wei Liu <wei.liu@...nel.org>