KVM: x86 emulator: do not perform address calculations on linear addresses

Linear addresses are supposed to already have segment checks performed on them;
if we play with these addresses the checks become invalid.

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

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index e967055..bdbbb18 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -568,7 +568,8 @@ static int read_descriptor(struct x86_emulate_ctxt *ctxt,
                           ctxt->vcpu, NULL);
        if (rc != X86EMUL_CONTINUE)
                return rc;
-       rc = ops->read_std(linear(ctxt, addr) + 2, address, op_bytes,
+       addr.ea += 2;
+       rc = ops->read_std(linear(ctxt, addr), address, op_bytes,
                           ctxt->vcpu, NULL);
        return rc;
 }