Merge: iommu/arm-smmu-v3: Fix pgsize_bit for sva domains

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6889

JIRA: https://issues.redhat.com/browse/RHEL-92493

## Summary of Changes

UBSan caught a bug with IOMMU SVA domains, where the reported exponent
value in __arm_smmu_tlb_inv_range() was >= 64.

__arm_smmu_tlb_inv_range() uses the domain's pgsize_bitmap to compute
the number of pages to invalidate and the invalidation range. Currently
arm_smmu_sva_domain_alloc() does not setup the iommu domain's
pgsize_bitmap. This leads to __ffs() on the value returning 64 and that
leads to undefined behaviour w.r.t. shift operations.

Fix this by initializing the iommu_domain's pgsize_bitmap to PAGE_SIZE.
Effectively the code needs to use the smallest page size for
invalidation.

Signed-off-by: Marcin Juszkiewicz <[email protected]>

Approved-by: Mark Langsdorf <[email protected]>
Approved-by: Jerry Snitselaar <[email protected]>
Approved-by: Donald Dutile <[email protected]>
Approved-by: CKI KWF Bot <[email protected]>

Merged-by: Augusto Caringi <[email protected]>

Author: caringi

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c

@@ -411,6 +411,12 @@ struct iommu_domain *arm_smmu_sva_domain_alloc(struct device *dev,
 		return ERR_CAST(smmu_domain);
 	smmu_domain->domain.type = IOMMU_DOMAIN_SVA;
 	smmu_domain->domain.ops = &arm_smmu_sva_domain_ops;
+
+	/*
+	 * Choose page_size as the leaf page size for invalidation when
+	 * ARM_SMMU_FEAT_RANGE_INV is present
+	 */
+	smmu_domain->domain.pgsize_bitmap = PAGE_SIZE;
 	smmu_domain->smmu = smmu;
 
 	ret = xa_alloc(&arm_smmu_asid_xa, &asid, smmu_domain,