From: Lu Baolu Date: Thu, 16 Jul 2026 05:35:53 +0000 (+0800) Subject: iommu/vt-d: Disallow SVA if page walk is not coherent X-Git-Tag: v7.2-rc5~24^2~2 X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=780dfed688622ea01be3c9c2c55eec2207f05e04;p=thirdparty%2Fkernel%2Flinux.git iommu/vt-d: Disallow SVA if page walk is not coherent Hardware implementations report Scalable-Mode Page-walk Coherency Support via the SMPWCS field in the extended capability register. If the hardware does not support page-walk coherency, a clflush is required every time the page table entries (which are walked by the IOMMU hardware) are updated. In the SVA case, page tables are managed by the CPU mm core, not by the IOMMU driver. Because the IOMMU driver has no way of knowing whether the CPU page table management code has ensured coherency via clflush, the driver must deny SVA if the hardware does not support coherent paging. Fixes: ff3dc6521f78 ("iommu/vt-d: Fix CPU and IOMMU SVM feature matching checks") Cc: stable@vger.kernel.org Signed-off-by: Lu Baolu Reviewed-by: Kevin Tian Reviewed-by: Samiullah Khawaja Reviewed-by: Jason Gunthorpe Signed-off-by: Will Deacon --- diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c index fea10acd4f02..726f7b6d0bff 100644 --- a/drivers/iommu/intel/svm.c +++ b/drivers/iommu/intel/svm.c @@ -27,7 +27,7 @@ void intel_svm_check(struct intel_iommu *iommu) { - if (!pasid_supported(iommu)) + if (!pasid_supported(iommu) || !ecap_smpwc(iommu->ecap)) return; if (cpu_feature_enabled(X86_FEATURE_GBPAGES) &&