linux-kernel - RE: [PATCH v6][RESEND] x86/hyperv: Suspend/resume the hypercall page for hibernation

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Message-ID: <PU1P153MB01552D8E75E152C3F3FB9C65BF040@PU1P153MB0155.APCP153.PROD.OUTLOOK.COM>
Date:   Thu, 30 Jan 2020 01:02:06 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Sasha Levin <sashal@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>
CC:     "arnd@...db.de" <arnd@...db.de>, "bp@...en8.de" <bp@...en8.de>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "hpa@...or.com" <hpa@...or.com>, KY Srinivasan <kys@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "x86@...nel.org" <x86@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>,
        vkuznets <vkuznets@...hat.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: RE: [PATCH v6][RESEND] x86/hyperv: Suspend/resume the hypercall page
 for hibernation

> From: linux-hyperv-owner@...r.kernel.org
> <linux-hyperv-owner@...r.kernel.org> On Behalf Of Sasha Levin
> Sent: Wednesday, January 29, 2020 4:06 PM
> To: Dexuan Cui <decui@...rosoft.com>
> Cc: arnd@...db.de; bp@...en8.de; daniel.lezcano@...aro.org; Haiyang Zhang
> <haiyangz@...rosoft.com>; hpa@...or.com; KY Srinivasan
> <kys@...rosoft.com>; linux-hyperv@...r.kernel.org;
> linux-kernel@...r.kernel.org; mingo@...hat.com; Stephen Hemminger
> <sthemmin@...rosoft.com>; tglx@...utronix.de; x86@...nel.org; Michael
> Kelley <mikelley@...rosoft.com>; Sasha Levin
> <Alexander.Levin@...rosoft.com>; vkuznets <vkuznets@...hat.com>;
> linux-arch@...r.kernel.org
> Subject: Re: [PATCH v6][RESEND] x86/hyperv: Suspend/resume the hypercall
> page for hibernation
> 
> On Sat, Jan 25, 2020 at 01:44:31AM +0000, Dexuan Cui wrote:
> >> From: Dexuan Cui <decui@...rosoft.com>
> >> Sent: Monday, January 6, 2020 2:43 PM
> >>
> >> This is needed for hibernation, e.g. when we resume the old kernel, we
> need
> >> to disable the "current" kernel's hypercall page and then resume the old
> >> kernel's.
> >>
> >> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> >> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> >> ---
> >>
> >> This is a RESEND of https://lkml.org/lkml/2019/11/20/68
> >>
> >> Please review.
> >>
> >> If it looks good, can you please pick it up through the tip.git tree?
> >>
> >>  arch/x86/hyperv/hv_init.c | 48
> >> +++++++++++++++++++++++++++++++++++++++
> >>  1 file changed, 48 insertions(+)
> >
> >Hi, Vitaly and x86 maintainers,
> >Can you please take a look at this patch?
> 
> Ping?
> 
> This patch has been floating around in it's current form for the past 2
> months. I'll happily take Hyper-V patches under arch/x86/hyperv/ via the
> Hyper-V tree rather than tip if the x86 folks don't want to deal with
> them.
> 
> --
> Thanks,
> Sasha

This straightforward patch is the only pending patch for v5.6 for the
hibernation functionality of Linux VM on Hyper-V. It would be really great
if we could merge it for v5.6-rc1. The patch is safe in that it only runs when 
the VM hibernates, and the hibernation functionality of Linux VM on
Hyper-V never worked before. I'm pretty sure the patch can not cause any
merge conflict since nobody else tries to modify the file recently.

Thanks,
-- Dexuan