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Re: [PATCH 2/2] xen/balloon: improve accuracy of initial balloon target for dom0
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Wed, 28 Jan 2026 16:23:58 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
- Delivery-date: Wed, 28 Jan 2026 15:24:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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