Ard Biesheuvel ec54ce1f1a ArmVirtPkg/ArmVirtQemu: Avoid early ID map on ThunderX ... The early ID map used by ArmVirtQemu uses ASID scoped non-global mappings, as this allows us to switch to the permanent ID map seamlessly without the need for explicit TLB maintenance. However, this triggers a known erratum on ThunderX, which does not tolerate non-global mappings that are executable at EL1, as this appears to result in I-cache corruption. (Linux disables the KPTI based Meltdown mitigation on ThunderX for the same reason) So work around this, by detecting the CPU implementor and part number, and proceeding without the early ID map if a ThunderX CPU is detected. Note that this requires the C code to be built with strict alignment again, as we may end up executing it with the MMU and caches off. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Laszlo Ersek <lersek@redhat.com> Tested-by: dann frazier <dann.frazier@canonical.com>		2023-01-10 17:37:39 +00:00
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ArmPlatformHelper.S	ArmVirtPkg/ArmVirtQemu: Avoid early ID map on ThunderX	2023-01-10 17:37:39 +00:00