From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: [PATCH 7/7] iommu/vt-d: debugfs: Avoid dumping context command register
Date: Thu, 18 Sep 2025 13:02:04 +0800 [thread overview]
Message-ID: <20250918050204.359508-8-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20250918050204.359508-1-baolu.lu@linux.intel.com>
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 to non-present registers.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20250917025051.143853-1-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
next prev parent reply other threads:[~2025-09-18 5:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-18 5:01 [PATCH 0/7] [PULL REQUEST] Intel IOMMU updates for v6.18 Lu Baolu
2025-09-18 5:01 ` [PATCH 1/7] iommu/vt-d: Replace snprintf with scnprintf in dmar_latency_snapshot() Lu Baolu
2025-09-18 5:01 ` [PATCH 2/7] iommu/vt-d: debugfs: Fix legacy mode page table dump logic Lu Baolu
2025-09-18 5:02 ` [PATCH 3/7] iommu/vt-d: Drop unused cap_super_offset() Lu Baolu
2025-09-18 5:02 ` [PATCH 4/7] iommu/vt-d: Remove LPIG from page group response descriptor Lu Baolu
2025-09-18 5:02 ` [PATCH 5/7] iommu/vt-d: PRS isn't usable if PDS isn't supported Lu Baolu
2025-09-18 5:02 ` [PATCH 6/7] iommu/vt-d: Removal of Advanced Fault Logging Lu Baolu
2025-09-18 5:02 ` Lu Baolu [this message]
2025-09-19 7:43 ` [PATCH 0/7] [PULL REQUEST] Intel IOMMU updates for v6.18 Joerg Roedel
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