* [PATCH 1/1] iommu/vt-d: debugfs: Avoid dumping context command register
@ 2025-09-17 2:50 Lu Baolu
2025-09-18 4:37 ` Baolu Lu
0 siblings, 1 reply; 2+ messages in thread
From: Lu Baolu @ 2025-09-17 2:50 UTC (permalink / raw)
To: Joerg Roedel, Will Deacon, Robin Murphy, Kevin Tian
Cc: iommu, linux-kernel, Lu Baolu
The register-based cache invalidation interface is in the process of being
replaced by the queued invalidation interface. The VT-d architecture
allows hardware implementations with a queued invalidation interface to
not implement the registers used for cache invalidation. Currently, the
debugfs interface dumps the Context Command Register unconditionally,
which is not reasonable.
Remove it to avoid potential access tonon-present registers.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel/debugfs.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/iommu/intel/debugfs.c b/drivers/iommu/intel/debugfs.c
index 765edb3740e2..617fd81a80f0 100644
--- a/drivers/iommu/intel/debugfs.c
+++ b/drivers/iommu/intel/debugfs.c
@@ -62,7 +62,6 @@ static const struct iommu_regset iommu_regs_64[] = {
IOMMU_REGSET_ENTRY(CAP),
IOMMU_REGSET_ENTRY(ECAP),
IOMMU_REGSET_ENTRY(RTADDR),
- IOMMU_REGSET_ENTRY(CCMD),
IOMMU_REGSET_ENTRY(PHMBASE),
IOMMU_REGSET_ENTRY(PHMLIMIT),
IOMMU_REGSET_ENTRY(IQH),
--
2.43.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH 1/1] iommu/vt-d: debugfs: Avoid dumping context command register
2025-09-17 2:50 [PATCH 1/1] iommu/vt-d: debugfs: Avoid dumping context command register Lu Baolu
@ 2025-09-18 4:37 ` Baolu Lu
0 siblings, 0 replies; 2+ messages in thread
From: Baolu Lu @ 2025-09-18 4:37 UTC (permalink / raw)
To: Joerg Roedel, Will Deacon, Robin Murphy, Kevin Tian; +Cc: iommu, linux-kernel
On 9/17/25 10:50, Lu Baolu wrote:
> The register-based cache invalidation interface is in the process of being
> replaced by the queued invalidation interface. The VT-d architecture
> allows hardware implementations with a queued invalidation interface to
> not implement the registers used for cache invalidation. Currently, the
> debugfs interface dumps the Context Command Register unconditionally,
> which is not reasonable.
>
> Remove it to avoid potential access tonon-present registers.
>
> Signed-off-by: Lu Baolu<baolu.lu@linux.intel.com>
> ---
> drivers/iommu/intel/debugfs.c | 1 -
> 1 file changed, 1 deletion(-)
Queued for v6.18.
^ permalink raw reply [flat|nested] 2+ messages in thread
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