From: Matt Fleming <[email protected]>
Folks, the below fix from Paolo addresses an issue causing 32-bit
non-PAE kernels to triple fault on EFI boot. The issue is that the
physical address of the GDT that gets used in efi_call_phys_prolog()
won't be covered by the identitty mapping in initial_page_table.
The following changes since commit 8a53554e12e98d1759205afd7b8e9e2ea0936f48:
x86/efi: Fix multiple GOP device support (2015-10-14 16:02:43 +0200)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git tags/efi-urgent
for you to fetch changes up to f5f3497cad8c8416a74b9aaceb127908755d020a:
x86/setup: Extend low identity map to cover whole kernel range (2015-10-16
10:52:29 +0100)
----------------------------------------------------------------
* 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
----------------------------------------------------------------
Paolo Bonzini (1):
x86/setup: Extend low identity map to cover whole kernel range
arch/x86/kernel/setup.c | 8 ++++++++
1 file changed, 8 insertions(+)
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