diff options
| author | Dmitry Skorodumov <sdmitry@parallels.com> | 2015-07-28 17:38:32 +0300 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2015-08-25 12:13:43 +0300 |
| commit | 929e4e372f73ac450db3c6998c39a2830f0243a4 (patch) | |
| tree | 704851843b5847588394158383bcb464384f490b /arch/x86/boot | |
| parent | 5bcade3e2948db43e5ff551e0c5e0003ce3d722d (diff) | |
| download | linux-929e4e372f73ac450db3c6998c39a2830f0243a4.tar.xz | |
x86/efi: Use all 64 bit of efi_memmap in setup_e820()
commit 7cc03e48965453b5df1cce5062c826189b04b960 upstream.
The efi_info structure stores low 32 bits of memory map
in efi_memmap and high 32 bits in efi_memmap_hi.
While constructing pointer in the setup_e820(), need
to take into account all 64 bit of the pointer.
It is because on 64bit machine the function
efi_get_memory_map() may return full 64bit pointer and before
the patch that pointer was truncated.
The issue is triggered on Parallles virtual machine and
fixed with this patch.
Signed-off-by: Dmitry Skorodumov <sdmitry@parallels.com>
Cc: Denis V. Lunev <den@openvz.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'arch/x86/boot')
| -rw-r--r-- | arch/x86/boot/compressed/eboot.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c index bfb3908493f8..c4784a052461 100644 --- a/arch/x86/boot/compressed/eboot.c +++ b/arch/x86/boot/compressed/eboot.c @@ -1159,6 +1159,10 @@ static efi_status_t setup_e820(struct boot_params *params, unsigned int e820_type = 0; unsigned long m = efi->efi_memmap; +#ifdef CONFIG_X86_64 + m |= (u64)efi->efi_memmap_hi << 32; +#endif + d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size)); switch (d->type) { case EFI_RESERVED_TYPE: |