iommu/amd: Lock DTE before updating the entry with WRITE_ONCE()

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When updating only within a 64-bit tuple of a DTE, just lock the DTE and
use WRITE_ONCE() because it is writing to memory read back by HW.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20241118054937.5203-9-suravee.suthikulpanit@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Suravee Suthikulpanit 2024-11-18 05:49:36 +00:00 • committed by Joerg Roedel

parent 66ea3f96ae

commit 457da57646

2 changed files with 25 additions and 19 deletions

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drivers/iommu/amd/amd_iommu.h

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drivers/iommu/amd/iommu.c

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