linux-kernel - [GIT PULL] EFI urgent fix

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Date:	Fri, 16 Oct 2015 11:01:45 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Matt Fleming <matt.fleming@...el.com>,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...en8.de>,
	Laszlo Ersek <lersek@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>, <stable@...r.kernel.org>
Subject: [GIT PULL] EFI urgent fix

From: Matt Fleming <matt.fleming@...el.com>

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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