From: Avi Kivity <avi@redhat.com>
Date: Thu, 8 Apr 2010 15:19:35 +0000 (+0300)
Subject: KVM: VMX: Save/restore rflags.vm correctly in real mode
X-Git-Tag: v2.6.34-rc6~78^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78ac8b47c566dd6177a3b9b291b756ccb70670b7;p=pandora-kernel.git

KVM: VMX: Save/restore rflags.vm correctly in real mode

Currently we set eflags.vm unconditionally when entering real mode emulation
through virtual-8086 mode, and clear it unconditionally when we enter protected
mode.  The means that the following sequence

  KVM_SET_REGS  (rflags.vm=1)
  KVM_SET_SREGS (cr0.pe=1)

Ends up with rflags.vm clear due to KVM_SET_SREGS triggering enter_pmode().

Fix by shadowing rflags.vm (and rflags.iopl) correctly while in real mode:
reads and writes to those bits access a shadow register instead of the actual
register.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---

Reading git-diff-tree failed