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[PATCH] AMD/IOMMU: don't increase perms when splitting superpage
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 19 Aug 2021 10:04:12 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>
- Delivery-date: Thu, 19 Aug 2021 08:04:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
The old (super)page's permissions ought to be propagated, rather than
blindly allowing both reads and writes.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -231,7 +231,7 @@ static int iommu_pde_from_dfn(struct dom
next_table_mfn = mfn_x(page_to_mfn(table));
set_iommu_ptes_present(next_table_mfn, pfn, mfn,
PTE_PER_TABLE_SIZE,
- next_level, true, true);
+ next_level, pde->iw, pde->ir);
smp_wmb();
set_iommu_pde_present(pde, next_table_mfn, next_level, true,
true);
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