Use Xen PAT

Qubes OS used Linux's PAT to prevent graphics corruption, but that corruption was actually due to a Linux core memory management bug that has since been fixed. (cherry picked from commit d4e297f) The Linux fix is 548cb932051f ("x86/mm: Fix PAT bit missing from page protection modify mask"), and is already backported to >= 5.10.
marmarek · Sep 29, 2024 · 394e018 · 394e018
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diff --git a/1019-Use-Linux-s-PAT.patch b/1019-Use-Linux-s-PAT.patch
diff --git a/xen.spec.in b/xen.spec.in
@@ -189,7 +189,6 @@ Patch1014: 1014-Additional-support-in-ACPI-builder-to-support-SLIC-a.patch
 Patch1015: 1015-libxl-conditionally-allow-PCI-passthrough-on-PV-with.patch
 Patch1016: 1016-gnttab-disable-grant-tables-v2-by-default.patch
 Patch1018: 1018-Fix-IGD-passthrough-with-linux-stubdomain.patch
-Patch1019: 1019-Use-Linux-s-PAT.patch
 
 # Reproducible builds
 Patch1100: 1100-Define-build-dates-time-based-on-SOURCE_DATE_EPOCH.patch