linux-kernel - Re: [PATCH] xen/balloon: Support xend-based toolstack take two

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Message-ID: <dee2ba34-c39a-9729-8136-463c0daae9d6@oracle.com>
Date:   Thu, 16 Jan 2020 14:32:56 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Cc:     Stefano Stabellini <sstabellini@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH] xen/balloon: Support xend-based toolstack take two



On 1/16/20 12:00 PM, Juergen Gross wrote:
> Commit 3aa6c19d2f38be ("xen/balloon: Support xend-based toolstack")
> tried to fix a regression with running on rather ancient Xen versions.
> Unfortunately the fix was based on the assumption that xend would
> just use another Xenstore node, but in reality only some downstream
> versions of xend are doing that. The upstream xend does not write
> that Xenstore node at all, so the problem must be fixed in another
> way.
>
> The easiest way to achieve that is to fall back to the behavior before
> commit 5266b8e4445c ("xen: fix booting ballooned down hvm guest")
> in case the static memory maximum can't be read.
>
> Fixes: 3aa6c19d2f38be ("xen/balloon: Support xend-based toolstack")
> Signed-off-by: Juergen Gross <jgross@...e.com>
> Cc: <stable@...r.kernel.org> # 4.13

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