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KVM: VMX: Check cpl before emulating debug register access
authorAvi Kivity <avi@redhat.com>
Tue, 1 Sep 2009 09:03:25 +0000 (12:03 +0300)
committerGreg Kroah-Hartman <gregkh@suse.de>
Thu, 24 Sep 2009 15:44:04 +0000 (08:44 -0700)
commitbd634611e589582bba636434af7fcbf782eceb42
tree3f39164ca5b51fcdef3d04f9f7bf944be5a37c30tree | snapshot
parentfc7a2de55c6ba0088d219a12f9825db54112e1a4commit | diff
KVM: VMX: Check cpl before emulating debug register access

commit 0a79b009525b160081d75cef5dbf45817956acf2 upstream.

Debug registers may only be accessed from cpl 0.  Unfortunately, vmx will
code to emulate the instruction even though it was issued from guest
userspace, possibly leading to an unexpected trap later.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
arch/x86/include/asm/kvm_host.h diff | blob | history
arch/x86/kvm/vmx.c diff | blob | history
arch/x86/kvm/x86.c diff | blob | history
unionfs2-2.6.39.y