KVM: x86 emulator: fix INTn emulation not pushing EFLAGS and CS

emulate_push() only schedules a push; it doesn't actually push anything.
Call writeback() to flush out the write.

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

1 files changed, 12 insertions, 1 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index cffe7c2819ed..b89a20ec7c9d 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1232,7 +1232,7 @@ int emulate_int_real(struct x86_emulate_ctxt *ctxt,
                                struct x86_emulate_ops *ops, int irq)
 {
         struct decode_cache *c = &ctxt->decode;
-        int rc = X86EMUL_CONTINUE;
+        int rc;
         struct desc_ptr dt;
         gva_t cs_addr;
         gva_t eip_addr;
@@ -1242,14 +1242,25 @@ int emulate_int_real(struct x86_emulate_ctxt *ctxt,
         /* TODO: Add limit checks */
         c->src.val = ctxt->eflags;
         emulate_push(ctxt, ops);
+        rc = writeback(ctxt, ops);
+        if (rc != X86EMUL_CONTINUE)
+                return rc;
 
         ctxt->eflags &= ~(EFLG_IF | EFLG_TF | EFLG_AC);
 
         c->src.val = ops->get_segment_selector(VCPU_SREG_CS, ctxt->vcpu);
         emulate_push(ctxt, ops);
+        rc = writeback(ctxt, ops);
+        if (rc != X86EMUL_CONTINUE)
+                return rc;
 
         c->src.val = c->eip;
         emulate_push(ctxt, ops);
+        rc = writeback(ctxt, ops);
+        if (rc != X86EMUL_CONTINUE)
+                return rc;
+
+        c->dst.type = OP_NONE;
 
         ops->get_idt(&dt, ctxt->vcpu);