Jiri Kosina bf29bddf04 x86/efi: Always map the first physical page into the EFI pagetables ... Commit: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode. It turns out though that there are 64-bit EFI implementations in the wild (this particular problem has been reported on a Lenovo Yoga 710-11IKB), which still make use of the first physical page for their own private use, even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory map. In case there is no mapping for this particular frame in the EFI pagetables, as soon as firmware tries to make use of it, a triple fault occurs and the system reboots (in case of the Yoga 710-11IKB this is very early during bootup). Fix that by always mapping the first page of physical memory into the EFI pagetables. We're free to hand this page to the BIOS, as trim_bios_range() will reserve the first page and isolate it away from memory allocators anyway. Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the regression on affected hardware, as this commit: ab72a27da ("x86/efi: Consolidate region mapping logic") later made the first physical frame not to be mapped anyway. Reported-by: Hanka Pavlikova <hanka@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Laura Abbott <labbott@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vojtech Pavlik <vojtech@ucw.cz> Cc: Waiman Long <waiman.long@hpe.com> Cc: linux-efi@vger.kernel.org Cc: stable@kernel.org # v4.8+ Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk [ Tidied up the changelog and the comment. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>		2017-01-28 09:18:56 +01:00
..
atom	x86/cpu: Rename Merrifield2 to Moorefield	2016-09-08 08:13:08 +02:00
ce4100	x86/init: Remove i8042_detect() from platform ops	2016-12-19 11:34:15 +01:00
efi	x86/efi: Always map the first physical page into the EFI pagetables	2017-01-28 09:18:56 +01:00
geode	x86/platform: Make platform/geode/net5501.c explicitly non-modular	2016-02-16 09:11:09 +01:00
goldfish	goldfish: platform device for x86	2013-01-21 12:09:19 -08:00
intel	x86/platform/iosf_mbi: Add Intel Tangier PCI id	2015-07-16 17:48:48 +02:00
intel-mid	x86/platform/intel-mid: Rename 'spidev' to 'mrfld_spidev'	2017-01-05 09:03:29 +01:00
intel-quark	x86/platform/intel/quark: Add printf attribute to imr_self_test_result()	2016-12-20 09:37:24 +01:00
iris	x86: platform: iris: drop owner assignment from platform_drivers	2014-10-20 16:20:15 +02:00
olpc	x86/platform/olpc: Fix resume handler build warning	2016-11-28 07:46:03 +01:00
scx200	X86: drivers: remove __dev* attributes.	2013-01-03 15:57:04 -08:00
sfi	x86: Cleanup irq_domain ops	2015-04-24 15:36:55 +02:00
ts5500	x86/platform: Delete extraneous MODULE_* tags fromm ts5500	2016-07-16 22:41:00 +02:00
uv	clocksource: Use a plain u64 instead of cycle_t	2016-12-25 11:04:12 +01:00
Makefile	platform/x86: mlx-platform: Move module from arch/x86	2016-12-16 23:30:24 +02:00