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>

path: root/sound/usb/line6/Kconfig

config SND_USB_LINE6
	tristate
	select SND_RAWMIDI
	select SND_PCM
	select SND_HWDEP

config SND_USB_POD
	tristate "Line 6 POD USB support"
	select SND_USB_LINE6
	help
	  This is a driver for PODxt and other similar devices,
	  supporting the following features:
	    * Reading/writing individual parameters
	    * Reading/writing complete channel, effects setup, and amp
	      setup data
	    * Channel switching
	    * Virtual MIDI interface
	    * Tuner access
	    * Playback/capture/mixer device for any ALSA-compatible PCM
	      audio application
	    * Signal routing (record clean/processed guitar signal,
	      re-amping)

config SND_USB_PODHD
	tristate "Line 6 POD X3/HD300/400/500 USB support"
	select SND_USB_LINE6
	help
	  This is a driver for POD X3, HD300, 400 and 500 devices.

config SND_USB_TONEPORT
	tristate "TonePort GX, UX1 and UX2 USB support"
	select SND_USB_LINE6
	select NEW_LEDS
	select LEDS_CLASS
	help
	  This is a driver for TonePort GX, UX1 and UX2 devices.

config SND_USB_VARIAX
	tristate "Variax Workbench USB support"
	select SND_USB_LINE6
	help
	  This is a driver for Variax Workbench device.