diff options
| author | Jon Pan-Doh <pandoh@google.com> | 2023-04-26 13:32:56 -0700 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-05-22 17:33:43 +0200 |
| commit | 2212fc2acf3f6ee690ea36506fb882a19d1bfcab (patch) | |
| tree | c267c58746c7a63c1d21e73f3f4de0850f460175 /drivers/iommu | |
| parent | 29f54745f24547a84b18582e054df9bea1a7bf3e (diff) | |
| download | linux-stable-2212fc2acf3f6ee690ea36506fb882a19d1bfcab.tar.gz linux-stable-2212fc2acf3f6ee690ea36506fb882a19d1bfcab.tar.bz2 linux-stable-2212fc2acf3f6ee690ea36506fb882a19d1bfcab.zip | |
iommu/amd: Fix domain flush size when syncing iotlb
When running on an AMD vIOMMU, we observed multiple invalidations (of
decreasing power of 2 aligned sizes) when unmapping a single page.
Domain flush takes gather bounds (end-start) as size param. However,
gather->end is defined as the last inclusive address (start + size - 1).
This leads to an off by 1 error.
With this patch, verified that 1 invalidation occurs when unmapping a
single page.
Fixes: a270be1b3fdf ("iommu/amd: Use only natural aligned flushes in a VM")
Cc: stable@vger.kernel.org # >= 5.15
Signed-off-by: Jon Pan-Doh <pandoh@google.com>
Tested-by: Sudheer Dantuluri <dantuluris@google.com>
Suggested-by: Gary Zibrat <gzibrat@google.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Acked-by: Nadav Amit <namit@vmware.com>
Link: https://lore.kernel.org/r/20230426203256.237116-1-pandoh@google.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd/iommu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index 3797e35df035..0f3ac4b489d6 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -2398,7 +2398,7 @@ static void amd_iommu_iotlb_sync(struct iommu_domain *domain, unsigned long flags; spin_lock_irqsave(&dom->lock, flags); - domain_flush_pages(dom, gather->start, gather->end - gather->start, 1); + domain_flush_pages(dom, gather->start, gather->end - gather->start + 1, 1); amd_iommu_domain_flush_complete(dom); spin_unlock_irqrestore(&dom->lock, flags); } |