linux-kernel - [PATCH 0/3] x86: clear vmcss on all cpus when doing kdump if necessary

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Message-ID: <5077BB7B.4030203@cn.fujitsu.com>
Date:	Fri, 12 Oct 2012 14:40:59 +0800
From:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
To:	x86@...nel.org, kexec@...ts.infradead.org,
	linux-doc@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	mtosatti@...hat.com
CC:	linux-kernel@...r.kernel.org,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: [PATCH 0/3] x86: clear vmcss on all cpus when doing kdump if necessary

Currently, kdump just makes all the logical processors leave VMX operation by
executing VMXOFF instruction, so any VMCSs active on the logical processors may
be corrupted. But, sometimes, we need the VMCSs to debug guest images contained
in the host vmcore. To prevent the corruption, we should VMCLEAR the VMCSs before
executing the VMXOFF instruction.

The patch set provides an alternative way to clear VMCSs related to guests
on all cpus when host is doing kdump.

zhangyanfei (3):
  x86/kexec: clear vmcss on all cpus if necessary
  KVM: make crash_clear_loaded_vmcss valid when kvm_intel is loaded
  sysctl: introduce a new interface to control kdump-vmcs-clear
    behaviour

 Documentation/sysctl/kernel.txt |    8 ++++++++
 arch/x86/include/asm/kexec.h    |    3 +++
 arch/x86/kernel/crash.c         |   23 +++++++++++++++++++++++
 arch/x86/kvm/vmx.c              |    9 +++++++++
 kernel/sysctl.c                 |   10 ++++++++++
 5 files changed, 53 insertions(+), 0 deletions(-)
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