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Drivers or platforms may create memory regions with the MMIO flag set that contain S-mode-accessible MMIO devices. This is strictly correct and should be allowed, along with the existing default case of S-mode-accessible MMIO devices appearing in non-MMIO memory regions. When passed SBI_DOMAIN_MMIO, sbi_domain_check_addr() will perform the correct set of permission checks. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Yu-Chien Peter Lin <peter.lin@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20251121193808.1528050-3-samuel.holland@sifive.com Signed-off-by: Anup Patel <anup@brainfault.org>