linux-kernel - Re: [PATCH v2] xen: fix booting ballooned down hvm guest

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Message-ID: <b334f70b-4a20-a65d-b48f-072f41277b49@oracle.com>
Date:   Thu, 26 Oct 2017 10:12:15 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     hw42@...umj.de, stable@...r.kernel.org
Subject: Re: [PATCH v2] xen: fix booting ballooned down hvm guest

On 10/26/2017 05:50 AM, Juergen Gross wrote:
> Commit 96edd61dcf44362d3ef0bed1a5361e0ac7886a63 ("xen/balloon: don't
> online new memory initially") introduced a regression when booting a
> HVM domain with memory less than mem-max: instead of ballooning down
> immediately the system would try to use the memory up to mem-max
> resulting in Xen crashing the domain.
>
> For HVM domains the current size will be reflected in Xenstore node
> memory/static-max instead of memory/target.
>
> Additionally we have to trigger the ballooning process at once.
>
> Cc: <stable@...r.kernel.org> # 4.13
> Fixes: 96edd61dcf44362d3ef0bed1a5361e0ac7886a63 ("xen/balloon: don't
>        online new memory initially")
>
> Reported-by: Simon Gaiser <hw42@...umj.de>
> Suggested-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>