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SubjectRe: [PATCH v2] x86, efi: Do not reserve boot services regions within reserved areas
On 06/14/2011 09:19 AM, Maarten Lankhorst wrote:
> Commit 916f676f8dc started reserving boot service code since some systems
> require you to keep that code around until SetVirtualAddressMap is called.
>
> However, in some cases those areas will overlap with reserved regions.
> The proper medium-term fix is to fix the bootloader to prevent the
> conflicts from occurring by moving the kernel to a better position,
> but the kernel should check for this possibility, and only reserve regions
> which can be reserved.
>
> Signed-off-by: Maarten Lankhorst <m.b.lankhorst@gmail.com>
>
> ---
>
> V2: Removed some printks and a unrelated change
>
> diff --git a/arch/x86/include/asm/memblock.h b/arch/x86/include/asm/memblock.h
> index 19ae14b..0cd3800 100644
> --- a/arch/x86/include/asm/memblock.h
> +++ b/arch/x86/include/asm/memblock.h
> @@ -4,7 +4,6 @@
> #define ARCH_DISCARD_MEMBLOCK
>
> u64 memblock_x86_find_in_range_size(u64 start, u64 *sizep, u64 align);
> -void memblock_x86_to_bootmem(u64 start, u64 end);
>
> void memblock_x86_reserve_range(u64 start, u64 end, char *name);
> void memblock_x86_free_range(u64 start, u64 end);
> @@ -19,5 +18,6 @@ u64 memblock_x86_hole_size(u64 start, u64 end);
> u64 memblock_x86_find_in_range_node(int nid, u64 start, u64 end, u64 size, u64 align);
> u64 memblock_x86_free_memory_in_range(u64 addr, u64 limit);
> u64 memblock_x86_memory_in_range(u64 addr, u64 limit);
> +bool memblock_x86_check_reserved_size(u64 *addrp, u64 *sizep, u64 align);
>
> #endif
> diff --git a/arch/x86/mm/memblock.c b/arch/x86/mm/memblock.c
> index aa11693..992da5e 100644
> --- a/arch/x86/mm/memblock.c
> +++ b/arch/x86/mm/memblock.c
> @@ -8,7 +8,7 @@
> #include <linux/range.h>
>
> /* Check for already reserved areas */
> -static bool __init check_with_memblock_reserved_size(u64 *addrp, u64 *sizep, u64 align)
> +bool __init memblock_x86_check_reserved_size(u64 *addrp, u64 *sizep, u64 align)
> {
> struct memblock_region *r;
> u64 addr = *addrp, last;
> @@ -59,7 +59,7 @@ u64 __init memblock_x86_find_in_range_size(u64 start, u64 *sizep, u64 align)
> if (addr >= ei_last)
> continue;
> *sizep = ei_last - addr;
> - while (check_with_memblock_reserved_size(&addr, sizep, align))
> + while (memblock_x86_check_reserved_size(&addr, sizep, align))
> ;
>
> if (*sizep)
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index 0d3a4fa..b8afde4 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -310,14 +310,30 @@ void __init efi_reserve_boot_services(void)
>
> for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
> efi_memory_desc_t *md = p;
> - unsigned long long start = md->phys_addr;
> - unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
> + u64 start = md->phys_addr;
> + u64 size = md->num_pages << EFI_PAGE_SHIFT;
>
> if (md->type != EFI_BOOT_SERVICES_CODE &&
> md->type != EFI_BOOT_SERVICES_DATA)
> continue;
> -
> - memblock_x86_reserve_range(start, start + size, "EFI Boot");
> + /* Only reserve where possible:
> + * - Not within any already allocated areas
> + * - Not over any memory area (really needed, if above?)
> + * - Not within any part of the kernel
> + * - Not the bios reserved area
> + */
> + if ((start+size >= virt_to_phys(_text)
> + && start <= virt_to_phys(_end)) ||
> + !e820_all_mapped(start, start+size, E820_RAM) ||
> + memblock_x86_check_reserved_size(&start, &size,
> + 1<<EFI_PAGE_SHIFT)) {
> + /* Could not reserve, skip it */
> + md->num_pages = 0;
> + memblock_dbg(PFX "Could not reserve boot area "
> + "[0x%llx-0x%llx)\n", start, start+size);

how about partial overlapping?

> + } else
> + memblock_x86_reserve_range(start, start+size,
> + "EFI Boot");
> }
> }
>
> @@ -334,6 +350,10 @@ static void __init efi_free_boot_services(void)
> md->type != EFI_BOOT_SERVICES_DATA)
> continue;
>
> + /* Could not reserve boot area */
> + if (!size)
> + continue;
> +
> free_bootmem_late(start, size);
> }
> }
>



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