linux-kernel - [PATCH 0/2] ACPI, x86/efi: Remove ACPI BGRT tables for kexec

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Message-Id: <1455723910-16710-1-git-send-email-matt@codeblueprint.co.uk>
Date:	Wed, 17 Feb 2016 15:45:08 +0000
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Dave Young <dyoung@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-acpi@...r.kernel.org, kexec@...ts.infradead.org,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Josh Triplett <josh@...htriplett.org>,
	Borislav Petkov <bp@...en8.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Matt Fleming <matt@...eblueprint.co.uk>
Subject: [PATCH 0/2] ACPI, x86/efi: Remove ACPI BGRT tables for kexec 

Based on Dave's report that the BGRT image regions are being accessed
on kexec reboot (which by that time contain garbage),

  https://lkml.kernel.org/r/20160127112044.GA2961@dhcp-128-65.nay.redhat.com

the following patches simply delete the table when doing a kexec boot.

This is part of a wider compaign to stop kexec-specific code from
leaking into all parts of arch/x86. Instead of sprinkling "if
(efi_setup)", kexec should be shaping the platform information to more
accurately describe which features are still available, so that
existing drivers work transparently without kexec quirks.

Matt Fleming (2):
  ACPICA: Tables: Add function to remove ACPI tables
  x86/efi: Delete ACPI BGRT when booting via kexec

 arch/x86/include/asm/efi.h    |  1 +
 arch/x86/kernel/setup.c       |  4 +++-
 arch/x86/platform/efi/efi.c   | 38 ++++++++++++++++++++++++++++++
 drivers/acpi/acpica/tbxface.c | 54 +++++++++++++++++++++++++++++++++++++++++++
 include/acpi/acpixf.h         |  3 +++
 5 files changed, 99 insertions(+), 1 deletion(-)

-- 
2.6.2