linux-kernel - [PATCH 0/2] xen/balloon: fix balloon driver initial target

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Message-ID: <20260128110510.46425-1-roger.pau@citrix.com>
Date: Wed, 28 Jan 2026 12:05:07 +0100
From: Roger Pau Monne <roger.pau@...rix.com>
To: xen-devel@...ts.xenproject.org,
	linux-kernel@...r.kernel.org
Cc: Roger Pau Monne <roger.pau@...rix.com>
Subject: [PATCH 0/2] xen/balloon: fix balloon driver initial target

Hello,

The fist patch is a bugfix to revert to the previous way of setting the
balloon memory target for PV domains.  The new way is off by ~97 pages
on domUs, because page at PFN 0 and the ISA range are ignored by Linux,
but populated from Xen's perspective.

Second patch aims to improve the initial memory target used by dom0.
With this new approach the target set by the balloon driver matches
exactly the target Xen by the toolstack when late-initializing it.

Thanks, Roger.

Roger Pau Monne (2):
  Partial revert "x86/xen: fix balloon target initialization for PVH
    dom0"
  xen/balloon: improve accuracy of initial balloon target for dom0

 arch/x86/xen/enlighten.c        |  2 +-
 drivers/xen/balloon.c           | 26 ++++++++++++++++++++++----
 drivers/xen/unpopulated-alloc.c |  3 +++
 include/xen/xen.h               |  2 ++
 4 files changed, 28 insertions(+), 5 deletions(-)

-- 
2.51.0