linux-kernel - Re: [PATCH v3 04/11] x86/xen: add system core suspend and resume callbacks

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Date:   Sun, 13 Sep 2020 13:25:23 -0400
From:   boris.ostrovsky@...cle.com
To:     Anchal Agarwal <anchalag@...zon.com>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        jgross@...e.com, linux-pm@...r.kernel.org, linux-mm@...ck.org,
        kamatam@...zon.com, sstabellini@...nel.org, konrad.wilk@...cle.com,
        roger.pau@...rix.com, axboe@...nel.dk, davem@...emloft.net,
        rjw@...ysocki.net, len.brown@...el.com, pavel@....cz,
        peterz@...radead.org, eduval@...zon.com, sblbir@...zon.com,
        xen-devel@...ts.xenproject.org, vkuznets@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        dwmw@...zon.co.uk, benh@...nel.crashing.org
Subject: Re: [PATCH v3 04/11] x86/xen: add system core suspend and resume
 callbacks


On 8/21/20 6:27 PM, Anchal Agarwal wrote:
> From: Munehisa Kamata <kamatam@...zon.com>
>
> Add Xen PVHVM specific system core callbacks for PM
> hibernation support. The callbacks suspend and resume
> Xen primitives like shared_info, pvclock and grant table.
> These syscore_ops are specifically for domU hibernation.
> xen_suspend() calls syscore_suspend() during Xen suspend
> operation however, during xen suspend lock_system_sleep()
> lock is taken and thus system cannot trigger hibernation.
> These system core callbacks will be called only from the
> hibernation context.


Well, they can be called from Xen suspend too, which is why you have the
checks in the beginning.


-boris