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

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Message-ID: <365b94bb-7dbe-6784-d4d2-39feadb22faa@oracle.com>
Date:   Thu, 26 Oct 2017 18:55:42 -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 10:12 AM, Boris Ostrovsky wrote:
> 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>
>

Applied to for-linus-4.14c.

-boris