OvmfPkg/FdtPciHostBridgeLib: mark PCI host MMIO mappings as non-executable#12878
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OvmfPkg/FdtPciHostBridgeLib: mark PCI host MMIO mappings as non-executable#12878apop5 wants to merge 1 commit into
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…table Add EFI_MEMORY_XP to all MapMmioMemory() calls in ProcessPciHost() for: - ECAM space - Translated I/O window - 32-bit MMIO window - 64-bit MMIO window These regions are data/MMIO only and should not be executable. Marking them with EFI_MEMORY_XP improves memory protection hardening without changing intended runtime behavior. Signed-off-by: Aaron Pop <aaronpop@microsoft.com>
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July 23, 2026 21:42
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Description
Add EFI_MEMORY_XP to all MapMmioMemory() calls in ProcessPciHost() for:
These regions are data/MMIO only and should not be executable. Marking them with EFI_MEMORY_XP improves memory protection hardening without changing intended runtime behavior.
How This Was Tested
#12874
Attempting to set Nx asserted because the MMIO regions were not reported as Nx capiable.
After making the change, the system was able to boot.
Integration Instructions
No integration necessary.