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It was reported that QEMU monitor command gva2gpa was reporting unmapped memory for a valid access (qemu-system-aarch64), during a copy from kernel to user space (__arch_copy_to_user symbol in Linux) [1]. This was affecting cpu_memory_rw_debug also, which is used in numerous places in our codebase. After investigating, the problem was specific to arm_cpu_get_phys_page_attrs_debug. When performing user access from a privileged space, we need to do a second lookup for user mmu idx, following what get_a64_user_mem_index is doing at translation time. [1] https://lists.nongnu.org/archive/html/qemu-discuss/2025-04/msg00013.html Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Message-id: 20250414153027.1486719-5-pierrick.bouvier@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org> |
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