src/patches/suse-2.6.27.25/patches.fixes/kvm-vmx-dont-allow-uninhibited-access-to-EFER-on-i386

   1 From: Avi Kivity <avi@redhat.com>
   2 Date: Mon, 23 Mar 2009 22:13:44 +0200
   3 Subject: KVM: VMX: Don't allow uninhibited access to EFER on i386
   4 Git-commit: 16175a796d061833aacfbd9672235f2d2725df65
   5 Patch-mainline: 2.6.30-rc1
   6 References: bnc#492760
   7
   8 vmx_set_msr() does not allow i386 guests to touch EFER, but they can still
   9 do so through the default: label in the switch.  If they set EFER_LME, they
  10 can oops the host.
  11
  12 Fix by having EFER access through the normal channel (which will check for
  13 EFER_LME) even on i386.
  14
  15 Reported-and-tested-by: Benjamin Gilbert <bgilbert@cs.cmu.edu>
  16 Cc: stable@kernel.org
  17 Signed-off-by: Avi Kivity <avi@redhat.com>
  18 Acked-by: Jeff Mahoney <jeffm@suse.com>
  19 ---
  20
  21  arch/x86/kvm/vmx.c |    2 +-
  22  1 file changed, 1 insertion(+), 1 deletion(-)
  23
  24 --- a/arch/x86/kvm/vmx.c
  25 +++ b/arch/x86/kvm/vmx.c
  26 @@ -898,11 +898,11 @@ static int vmx_set_msr(struct kvm_vcpu *
  27         int ret = 0;
  28
  29         switch (msr_index) {
  30 -#ifdef CONFIG_X86_64
  31         case MSR_EFER:
  32                 vmx_load_host_state(vmx);
  33                 ret = kvm_set_msr_common(vcpu, msr_index, data);
  34                 break;
  35 +#ifdef CONFIG_X86_64
  36         case MSR_FS_BASE:
  37                 vmcs_writel(GUEST_FS_BASE, data);
  38                 break;