KVM: VMX: Check cpl before emulating debug register access

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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.

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

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This commit is contained in:

Avi Kivity 2009-09-01 12:03:25 +03:00

parent 4da748960a

commit 0a79b00952

3 changed files with 16 additions and 0 deletions

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1

arch/x86/include/asm/kvm_host.h

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2

arch/x86/kvm/vmx.c

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13

arch/x86/kvm/x86.c

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