Segment limits are verified in real mode, not just protected mode.
Signed-off-by: Avi Kivity <[email protected]>
---
arch/x86/kvm/emulate.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 7281ff8..67da0ac 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -632,8 +632,6 @@ static int __linearize(struct x86_emulate_ctxt *ctxt,
la = seg_base(ctxt, addr.seg) + addr.ea;
switch (ctxt->mode) {
- case X86EMUL_MODE_REAL:
- break;
case X86EMUL_MODE_PROT64:
if (((signed long)la << 16) >> 16 != la)
return emulate_gp(ctxt, 0);
@@ -663,7 +661,10 @@ static int __linearize(struct x86_emulate_ctxt *ctxt,
goto bad;
}
cpl = ctxt->ops->cpl(ctxt);
- rpl = sel & 3;
+ if (ctxt->mode == X86EMUL_MODE_REAL)
+ rpl = 0;
+ else
+ rpl = sel & 3;
cpl = max(cpl, rpl);
if (!(desc.type & 8)) {
/* data segment */
--
1.7.11.3
--
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