This is a note to let you know that I've just added the patch titled
iommu/amd: use full 64-bit value in build_completion_wait()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-amd-use-full-64-bit-value-in-build_completion_.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit cacf3d2ff13b7e86aa26091343ac4b7c861b15cc
Author: John Sperbeck <jsperbeck@xxxxxxxxxx>
Date: Mon Aug 1 19:22:29 2022 +0000
iommu/amd: use full 64-bit value in build_completion_wait()
[ Upstream commit 94a568ce32038d8ff9257004bb4632e60eb43a49 ]
We started using a 64 bit completion value. Unfortunately, we only
stored the low 32-bits, so a very large completion value would never
be matched in iommu_completion_wait().
Fixes: c69d89aff393 ("iommu/amd: Use 4K page for completion wait write-back semaphore")
Signed-off-by: John Sperbeck <jsperbeck@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220801192229.3358786-1-jsperbeck@xxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 200cf5da5e0ad..f216a86d9c817 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -923,7 +923,8 @@ static void build_completion_wait(struct iommu_cmd *cmd,
memset(cmd, 0, sizeof(*cmd));
cmd->data[0] = lower_32_bits(paddr) | CMD_COMPL_WAIT_STORE_MASK;
cmd->data[1] = upper_32_bits(paddr);
- cmd->data[2] = data;
+ cmd->data[2] = lower_32_bits(data);
+ cmd->data[3] = upper_32_bits(data);
CMD_SET_TYPE(cmd, CMD_COMPL_WAIT);
}
