[v1] iommu/amd-vi: remove zeroing of MMIO region

[PATCH 0/2] iommu/amd-vi: remove zeroing of MMIO region

Roger Pau Monne posted 2 patches 1 week, 6 days ago

Diff against v2
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git fetch https://gitlab.com/xen-project/patchew/xen tags/patchew/20260506073719.40075-1-roger.pau@citrix.com

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xen/drivers/passthrough/amd/iommu_init.c | 34 +++++++++++-------------
1 file changed, 15 insertions(+), 19 deletions(-)

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[PATCH 0/2] iommu/amd-vi: remove zeroing of MMIO region

Posted by Roger Pau Monne 1 week, 6 days ago

Hello,

Unconditionally zeroing the whole IOMMU MMIO region is dangerous, at
least on an upcoming platform this puts the IOMMU in a broken state
that's not recovered 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 | 34 +++++++++++-------------
 1 file changed, 15 insertions(+), 19 deletions(-)

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2.53.0