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[PATCH v4 0/4] vpci: allow 32-bit BAR writes with memory decoding enabled

From: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>

Date: Mon, 6 Apr 2026 15:11:54 -0400

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Cc: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, "Julien Grall" <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "Mykyta Poturai" <Mykyta_Poturai@xxxxxxxx>

Delivery-date: Mon, 06 Apr 2026 19:12:30 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

These 2 patches ("vpci: Use pervcpu ranges for BAR mapping") ("vpci: allow queueing of mapping operations") are also pre-requisites for SR-IOV. Pipeline: https://gitlab.com/xen-project/people/stewarthildebrand/xen/-/pipelines/2432615038 v3->v4: * switch back to dynamically allocated queue elements v2->v3: * add ("vpci: Use pervcpu ranges for BAR mapping") * rework with fixed array of map/unmap slots v1->v2: * new approach with queued p2m operations RFC->v1: * rework BAR mapping machinery to support unmap-then-map operation v3: https://lore.kernel.org/xen-devel/20260324030513.700217-1-stewart.hildebrand@xxxxxxx/T/#t v2: https://lore.kernel.org/xen-devel/20250723163744.13095-1-stewart.hildebrand@xxxxxxx/T/#t v1: https://lore.kernel.org/xen-devel/20250531125405.268984-1-stewart.hildebrand@xxxxxxx/T/#t RFC: https://lore.kernel.org/xen-devel/20250312195019.382926-1-stewart.hildebrand@xxxxxxx/T/#t Mykyta Poturai (1): vpci: Use pervcpu ranges for BAR mapping Stewart Hildebrand (3): vpci: allow queueing of mapping operations vpci: allow BAR map/unmap without affecting memory decoding bit vpci: allow 32-bit BAR writes with memory decoding enabled xen/common/domain.c | 2 + xen/drivers/vpci/header.c | 333 ++++++++++++++++++++++++-------------- xen/drivers/vpci/vpci.c | 10 +- xen/include/xen/vpci.h | 22 ++- 4 files changed, 239 insertions(+), 128 deletions(-) base-commit: 33ceaa28275ca4e298616689ef96f19efaa87c35 -- 2.53.0

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