linux-kernel - Re: [PATCH v2 01/11] xen/manage: keep track of the on-going suspend mode

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Date:   Wed, 5 Aug 2020 09:31:13 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Anchal Agarwal <anchalag@...zon.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>, 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, 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 v2 01/11] xen/manage: keep track of the on-going suspend
 mode

On 8/4/20 7:42 PM, Anchal Agarwal wrote:
>
> I think this could be done. PM_HIBERNATION_PREPARE could return -ENOTSUPP
> for arm and pvh dom0 when the notifier call chain is invoked for this case
> in hibernate(). This will then be an empty notifier just for checking two
> usecases.
> Also, for pvh dom0, the earlier code didn't register any notifier,
> with this approach you are suggesting setup the notifier for hvm/pvh dom0 and
> arm but fail during notifier call chain during PM_HIBERNATION_PREPARE ?


Right.


(Although the earlier code did register the notifier:
xen_setup_pm_notifier() would return an error for !xen_hvm_domain() and
PVH *is* an HVM domain, so registration would actually happen)


>
> I think still getting rid of suspend mode that was earlier a part of this
> notifier is a good idea as it seems redundant as you pointed out earlier. 


Yes.


-boris