Hi folks, Two fixes to how get_phys_addr_lpae() forms the initial table base address when TTBR uses its 52-bit layout, each with a TCG test.
The first stops TTBR[5:4] leaking into the base address of a table smaller than 64 bytes. KVM's page_fault_test hangs on it under TCG in its 16KB, 52-bit PA guest mode. Itaru reported the 16KB hang on kvmarm last year [1]. The second uses the 52-bit layout whenever TCR.DS is set, as the architecture does, not only with a 52-bit OA. With a smaller OA a non-zero TTBR[5:2] is then an Address size fault. Based on QEMU master (f7ada39eda). Cheers, /fuad [1] https://lore.kernel.org/kvmarm/[email protected]/ Fuad Tabba (2): target/arm: Clear TTBR[5:0] from a 52-bit table base address target/arm: Use the 52-bit TTBR base address layout when TCR.DS is set target/arm/ptw.c | 15 +- tests/tcg/aarch64/system/meson.build | 6 + tests/tcg/aarch64/system/ttbr-baddr.c | 194 ++++++++++++++++++++++++++ 3 files changed, 209 insertions(+), 6 deletions(-) create mode 100644 tests/tcg/aarch64/system/ttbr-baddr.c -- 2.39.5
