Commit 7d68dc3f authored by Maarten Lankhorst's avatar Maarten Lankhorst Committed by Ingo Molnar

x86, efi: Do not reserve boot services regions within reserved areas

Commit 916f676f 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: default avatarMaarten Lankhorst <m.b.lankhorst@gmail.com>
Link: http://lkml.kernel.org/r/4DF7A005.1050407@gmail.comAcked-by: default avatarMatthew Garrett <mjg@redhat.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent c11760c6
...@@ -4,7 +4,6 @@ ...@@ -4,7 +4,6 @@
#define ARCH_DISCARD_MEMBLOCK #define ARCH_DISCARD_MEMBLOCK
u64 memblock_x86_find_in_range_size(u64 start, u64 *sizep, u64 align); 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_reserve_range(u64 start, u64 end, char *name);
void memblock_x86_free_range(u64 start, u64 end); void memblock_x86_free_range(u64 start, u64 end);
...@@ -19,5 +18,6 @@ u64 memblock_x86_hole_size(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_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_free_memory_in_range(u64 addr, u64 limit);
u64 memblock_x86_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 #endif
...@@ -8,7 +8,7 @@ ...@@ -8,7 +8,7 @@
#include <linux/range.h> #include <linux/range.h>
/* Check for already reserved areas */ /* 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; struct memblock_region *r;
u64 addr = *addrp, last; u64 addr = *addrp, last;
...@@ -59,7 +59,7 @@ u64 __init memblock_x86_find_in_range_size(u64 start, u64 *sizep, u64 align) ...@@ -59,7 +59,7 @@ u64 __init memblock_x86_find_in_range_size(u64 start, u64 *sizep, u64 align)
if (addr >= ei_last) if (addr >= ei_last)
continue; continue;
*sizep = ei_last - addr; *sizep = ei_last - addr;
while (check_with_memblock_reserved_size(&addr, sizep, align)) while (memblock_x86_check_reserved_size(&addr, sizep, align))
; ;
if (*sizep) if (*sizep)
......
...@@ -310,14 +310,31 @@ void __init efi_reserve_boot_services(void) ...@@ -310,14 +310,31 @@ void __init efi_reserve_boot_services(void)
for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
efi_memory_desc_t *md = p; efi_memory_desc_t *md = p;
unsigned long long start = md->phys_addr; u64 start = md->phys_addr;
unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; u64 size = md->num_pages << EFI_PAGE_SHIFT;
if (md->type != EFI_BOOT_SERVICES_CODE && if (md->type != EFI_BOOT_SERVICES_CODE &&
md->type != EFI_BOOT_SERVICES_DATA) md->type != EFI_BOOT_SERVICES_DATA)
continue; continue;
/* Only reserve where possible:
memblock_x86_reserve_range(start, start + size, "EFI Boot"); * - 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 range "
"[0x%010llx-0x%010llx]\n",
start, start+size-1);
} else
memblock_x86_reserve_range(start, start+size,
"EFI Boot");
} }
} }
...@@ -334,6 +351,10 @@ static void __init efi_free_boot_services(void) ...@@ -334,6 +351,10 @@ static void __init efi_free_boot_services(void)
md->type != EFI_BOOT_SERVICES_DATA) md->type != EFI_BOOT_SERVICES_DATA)
continue; continue;
/* Could not reserve boot area */
if (!size)
continue;
free_bootmem_late(start, size); free_bootmem_late(start, size);
} }
} }
......
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