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* Ensure that the identity mapping in initial_page_table is updated

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to cover the entire kernel range. This fixes a triple fault on
    non-PAE kernels when booting on 32-bit EFI due to accessing an
    unmapped GDT in efi_call_phys_prolog() - Paolo Bonzini
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Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent

Pull EFI fix from Matt Fleming:

 - Ensure that the identity mapping in initial_page_table is updated
   to cover the entire kernel range. This fixes a triple fault on
   non-PAE kernels when booting on 32-bit EFI due to accessing an
   unmapped GDT in efi_call_phys_prolog(). (Paolo Bonzini)

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-10-16 12:03:22 +02:00
commit 1a80058905
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/setup.c
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@ -1173,6 +1173,14 @@ void __init setup_arch(char **cmdline_p)
clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
swapper_pg_dir + KERNEL_PGD_BOUNDARY,
KERNEL_PGD_PTRS);
/*
* sync back low identity map too. It is used for example
* in the 32-bit EFI stub.
*/
clone_pgd_range(initial_page_table,
swapper_pg_dir + KERNEL_PGD_BOUNDARY,
KERNEL_PGD_PTRS);
#endif
tboot_probe();