Pull arm64 fix from Catalin Marinas: "A previous commit to prevent AML memory opregions from accessing the kernel memory turned out to be too restrictive. Relax the permission check to permit the ACPI core to map kernel memory used for table overrides" * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: permit ACPI core to map kernel memory used for table overrides
Unified · Split
| @@ -298,8 +298,21 @@ void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) · 297 unmodified lines | ||
| 298 | 298 | case EFI_BOOT_SERVICES_DATA: |
| 299 | 299 | case EFI_CONVENTIONAL_MEMORY: |
| 300 | 300 | case EFI_PERSISTENT_MEMORY: |
| 301 | − pr_warn(FW_BUG "requested region covers kernel memory @ %pa\n", &phys); | |
| 302 | − return NULL; | |
| 301 | + if (memblock_is_map_memory(phys) || | |
| 302 | + !memblock_is_region_memory(phys, size)) { | |
| 303 | + pr_warn(FW_BUG "requested region covers kernel memory @ %pa\n", &phys); | |
| 304 | + return NULL; | |
| 305 | + } | |
| 306 | + /* | |
| 307 | + * Mapping kernel memory is permitted if the region in | |
| 308 | + * question is covered by a single memblock with the | |
| 309 | + * NOMAP attribute set: this enables the use of ACPI | |
| 310 | + * table overrides passed via initramfs, which are | |
| 311 | + * reserved in memory using arch_reserve_mem_area() | |
| 312 | + * below. As this particular use case only requires | |
| 313 | + * read access, fall through to the R/O mapping case. | |
| 314 | + */ | |
| 315 | + fallthrough; | |
| 303 | 316 | |
| 304 | 317 | case EFI_RUNTIME_SERVICES_CODE: |
| 305 | 318 | /* |
| @@ -388,3 +401,8 @@ int apei_claim_sea(struct pt_regs *regs) · 82 unmodified lines | ||
| 388 | 401 | |
| 389 | 402 | return err; |
| 390 | 403 | } |
| 404 | + | |
| 405 | +void arch_reserve_mem_area(acpi_physical_address addr, size_t size) | |
| 406 | +{ | |
| 407 | + memblock_mark_nomap(addr, size); | |
| 408 | +} | |
| @@ -958,7 +958,7 @@ void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state, · 957 unmodified lines | ||
| 958 | 958 | acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, |
| 959 | 959 | u32 val_a, u32 val_b); |
| 960 | 960 | |
| 961 | −#ifdef CONFIG_X86 | |
| 961 | +#ifndef CONFIG_IA64 | |
| 962 | 962 | void arch_reserve_mem_area(acpi_physical_address addr, size_t size); |
| 963 | 963 | #else |
| 964 | 964 | static inline void arch_reserve_mem_area(acpi_physical_address addr, |