1 files changed, 0 insertions, 72 deletions
diff --git a/system/xen/xsa/xsa347-4.13-2.patch b/system/xen/xsa/xsa347-4.13-2.patch
deleted file mode 100644
index fbe7461636071..0000000000000
--- a/system/xen/xsa/xsa347-4.13-2.patch
+++ /dev/null
@@ -1,72 +0,0 @@
-From: Jan Beulich <jbeulich@suse.com>
-Subject: AMD/IOMMU: update live PTEs atomically
-
-Updating a live PTE bitfield by bitfield risks the compiler re-ordering
-the individual updates as well as splitting individual updates into
-multiple memory writes. Construct the new entry fully in a local
-variable, do the check to determine the flushing needs on the thus
-established new entry, and then write the new entry by a single insn.
-
-Similarly using memset() to clear a PTE is unsafe, as the order of
-writes the function does is, at least in principle, undefined.
-
-This is part of XSA-347.
-
-Signed-off-by: Jan Beulich <jbeulich@suse.com>
-Reviewed-by: Paul Durrant <paul@xen.org>
-
---- a/xen/drivers/passthrough/amd/iommu_map.c
-+++ b/xen/drivers/passthrough/amd/iommu_map.c
-@@ -45,7 +45,7 @@ static unsigned int clear_iommu_pte_pres
-     pte = &table[pfn_to_pde_idx(dfn, 1)];
- 
-     flush_flags = pte->pr ? IOMMU_FLUSHF_modified : 0;
--    memset(pte, 0, sizeof(*pte));
-+    write_atomic(&pte->raw, 0);
- 
-     unmap_domain_page(table);
- 
-@@ -57,26 +57,30 @@ static unsigned int set_iommu_pde_presen
-                                           unsigned int next_level, bool iw,
-                                           bool ir)
- {
-+    union amd_iommu_pte new = {}, old;
-     unsigned int flush_flags = IOMMU_FLUSHF_added;
- 
--    if ( pte->pr &&
--         (pte->mfn != next_mfn ||
--          pte->iw != iw ||
--          pte->ir != ir ||
--          pte->next_level != next_level) )
--            flush_flags |= IOMMU_FLUSHF_modified;
--
-     /*
-      * FC bit should be enabled in PTE, this helps to solve potential
-      * issues with ATS devices
-      */
--    pte->fc = !next_level;
-+    new.fc = !next_level;
-+
-+    new.mfn = next_mfn;
-+    new.iw = iw;
-+    new.ir = ir;
-+    new.next_level = next_level;
-+    new.pr = true;
-+
-+    old.raw = read_atomic(&pte->raw);
-+    old.ign0 = 0;
-+    old.ign1 = 0;
-+    old.ign2 = 0;
-+
-+    if ( old.pr && old.raw != new.raw )
-+        flush_flags |= IOMMU_FLUSHF_modified;
- 
--    pte->mfn = next_mfn;
--    pte->iw = iw;
--    pte->ir = ir;
--    pte->next_level = next_level;
--    pte->pr = 1;
-+    write_atomic(&pte->raw, new.raw);
- 
-     return flush_flags;
- }