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

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Message-ID: <4ec47fee-d806-7f10-6e7e-93d2c7068ebc@ipsumj.de>
Date:   Thu, 26 Oct 2017 15:40:00 +0000
From:   HW42 <hw42@...umj.de>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     boris.ostrovsky@...cle.com, stable@...r.kernel.org
Subject: Re: [PATCH v2] xen: fix booting ballooned down hvm guest

Juergen Gross:
> 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>

Fixes the issues for me. Thanks.



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