linux-kernel - Re: [PATCH 2/2] xen/balloon: improve accuracy of initial balloon target for dom0

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Message-ID: <7c05accc-91b7-45cf-b470-d8e134f2c99c@suse.com>
Date: Wed, 28 Jan 2026 16:23:58 +0100
From: Jürgen Groß <jgross@...e.com>
To: Roger Pau Monne <roger.pau@...rix.com>, xen-devel@...ts.xenproject.org,
 linux-kernel@...r.kernel.org
Cc: Stefano Stabellini <sstabellini@...nel.org>,
 Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Subject: Re: [PATCH 2/2] xen/balloon: improve accuracy of initial balloon
 target for dom0

On 28.01.26 12:05, Roger Pau Monne wrote:
> The dom0 balloon target set by the toolstack is the value returned by
> XENMEM_current_reservation.  Do the same in the kernel balloon driver and
> set the current allocation to the value returned by
> XENMEM_current_reservation.  On my test system this causes the kernel
> balloon driver target to exactly match the value set by the toolstack in
> xenstore.
> 
> Note this approach can be used by both PV and PVH dom0s, as the toolstack
> always uses XENMEM_current_reservation to set the initial target regardless
> of the dom0 type.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen

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