| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.12 27/84] efi: Process the MEMATTR table only if EFI_MEMMAP is enabled | Date | Wed, 19 Jul 2017 11:43:33 +0200 |
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4.12-stable review patch. If anyone has any objections, please let me know.
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From: Daniel Kiper <daniel.kiper@oracle.com>
commit 457ea3f7e97881f937136ce0ba1f29f82b9abdb0 upstream.
Otherwise e.g. Xen dom0 on x86_64 EFI platforms crashes.
In theory we can check EFI_PARAVIRT too, however, EFI_MEMMAP looks more targeted and covers more cases.
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: andrew.cooper3@citrix.com Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1498128697-12943-2-git-send-email-daniel.kiper@oracle.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/firmware/efi/efi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -528,7 +528,8 @@ int __init efi_config_parse_tables(void } } - efi_memattr_init(); + if (efi_enabled(EFI_MEMMAP)) + efi_memattr_init(); /* Parse the EFI Properties table if it exists */ if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {
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