From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Sat, 3 Jul 2010 08:02:42 +0000 (+0800)
Subject: KVM: VMX: fix tlb flush with invalid root
X-Git-Tag: v2.6.36-rc1~580^2~41
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dd180b3e90253cb4ca95d603a8c17413f8daec69;p=pandora-kernel.git

KVM: VMX: fix tlb flush with invalid root

Commit 341d9b535b6c simplify reload logic while entry guest mode, it
can avoid unnecessary sync-root if KVM_REQ_MMU_RELOAD and
KVM_REQ_MMU_SYNC both set.

But, it cause a issue that when we handle 'KVM_REQ_TLB_FLUSH', the
root is invalid, it is triggered during my test:

Kernel BUG at ffffffffa00212b8 [verbose debug info unavailable]
......

Fixed by directly return if the root is not ready.

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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