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[PATCH v2 0/2] iommu/amd-vi: remove zeroing of MMIO region
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Date: Wed, 6 May 2026 15:55:12 +0200
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- Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- Delivery-date: Wed, 06 May 2026 13:56:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hello,
Unconditionally zeroing the whole IOMMU MMIO region is dangerous, at
least on an upcoming platform this does put the IOMMU in a broken state
that's not recoverable by the init procedure in Xen.
Get rid of the zeroing, and instead attempt to disable the IOMMU ahead
of enabling it.
Thanks, Roger.
Roger Pau Monne (2):
iommu/amd-vi: allow disable_iommu() against non-initialized IOMMUs
iommu/amd-vi: do not zero IOMMU MMIO region
xen/drivers/passthrough/amd/iommu_init.c | 41 +++++++++++++-----------
1 file changed, 22 insertions(+), 19 deletions(-)
--
2.53.0
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