efi/x86: Don't panic or BUG() on non-critical error conditions

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[ Upstream commit e2d68a955e ]

The logic in __efi_enter_virtual_mode() does a number of steps in
sequence, all of which may fail in one way or the other. In most
cases, we simply print an error and disable EFI runtime services
support, but in some cases, we BUG() or panic() and bring down the
system when encountering conditions that we could easily handle in
the same way.

While at it, replace a pointless page-to-virt-phys conversion with
one that goes straight from struct page to physical.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Matthew Garrett <mjg59@google.com>
Cc: linux-efi@vger.kernel.org
Link: https://lkml.kernel.org/r/20200103113953.9571-14-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Ard Biesheuvel 2020-01-03 12:39:46 +01:00 • committed by Greg Kroah-Hartman

parent 2a0a4875ca

commit 5650aaa1c7

2 changed files with 19 additions and 18 deletions

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28

arch/x86/platform/efi/efi.c

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9

arch/x86/platform/efi/efi_64.c

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