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Commit 79d5b4c3 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: x86 emulator: allow loading null SS in long mode 



Null SS is valid in long mode; allow loading it.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 6d6eede4

arch/x86/kvm/emulate.c

+8 −4
Original line number Diff line number Diff line
@@ -1324,8 +1324,14 @@ static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, 
		goto load;

	}



	/* NULL selector is not valid for TR, CS and SS */

	if ((seg == VCPU_SREG_CS || seg == VCPU_SREG_SS || seg == VCPU_SREG_TR)

	rpl = selector & 3;

	cpl = ctxt->ops->cpl(ctxt);



	/* NULL selector is not valid for TR, CS and SS (except for long mode) */

	if ((seg == VCPU_SREG_CS

	     || (seg == VCPU_SREG_SS

		 && (ctxt->mode != X86EMUL_MODE_PROT64 || rpl != cpl))

	     || seg == VCPU_SREG_TR)

	    && null_selector)

		goto exception;
@@ -1352,9 +1358,7 @@ static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt, 
		goto exception;

	}



	rpl = selector & 3;

	dpl = seg_desc.dpl;

	cpl = ctxt->ops->cpl(ctxt);



	switch (seg) {

	case VCPU_SREG_SS: