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authorGlauber Costa <glommer@redhat.com>2009-05-12 16:21:06 -0400
committerAvi Kivity <avi@redhat.com>2009-06-10 11:48:54 +0300
commit310b5d306c1aee7ebe32f702c0e33e7988d50646 (patch)
tree101bb4c72f1bb3eb3d4f60406435703f538c0ced /arch/x86/kvm/x86_emulate.c
parent2809f5d2c4cfad171167b131bb2a21ab65eba40f (diff)
KVM: Deal with interrupt shadow state for emulated instructions
We currently unblock shadow interrupt state when we skip an instruction, but failing to do so when we actually emulate one. This blocks interrupts in key instruction blocks, in particular sti; hlt; sequences If the instruction emulated is an sti, we have to block shadow interrupts. The same goes for mov ss. pop ss also needs it, but we don't currently emulate it. Without this patch, I cannot boot gpxe option roms at vmx machines. This is described at https://bugzilla.redhat.com/show_bug.cgi?id=494469 Signed-off-by: Glauber Costa <glommer@redhat.com> CC: H. Peter Anvin <hpa@zytor.com> CC: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86_emulate.c')
-rw-r--r--arch/x86/kvm/x86_emulate.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index d2664fcba7fa..c1b6c232e02b 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -1361,6 +1361,20 @@ static inline int writeback(struct x86_emulate_ctxt *ctxt,
return 0;
}
+void toggle_interruptibility(struct x86_emulate_ctxt *ctxt, u32 mask)
+{
+ u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(ctxt->vcpu, mask);
+ /*
+ * an sti; sti; sequence only disable interrupts for the first
+ * instruction. So, if the last instruction, be it emulated or
+ * not, left the system with the INT_STI flag enabled, it
+ * means that the last instruction is an sti. We should not
+ * leave the flag on in this case. The same goes for mov ss
+ */
+ if (!(int_shadow & mask))
+ ctxt->interruptibility = mask;
+}
+
int
x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
{
@@ -1372,6 +1386,8 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
int io_dir_in;
int rc = 0;
+ ctxt->interruptibility = 0;
+
/* Shadow copy of register state. Committed on successful emulation.
* NOTE: we can copy them from vcpu as x86_decode_insn() doesn't
* modify them.
@@ -1618,6 +1634,9 @@ special_insn:
int err;
sel = c->src.val;
+ if (c->modrm_reg == VCPU_SREG_SS)
+ toggle_interruptibility(ctxt, X86_SHADOW_INT_MOV_SS);
+
if (c->modrm_reg <= 5) {
type_bits = (c->modrm_reg == 1) ? 9 : 1;
err = kvm_load_segment_descriptor(ctxt->vcpu, sel,
@@ -1847,6 +1866,7 @@ special_insn:
c->dst.type = OP_NONE; /* Disable writeback. */
break;
case 0xfb: /* sti */
+ toggle_interruptibility(ctxt, X86_SHADOW_INT_STI);
ctxt->eflags |= X86_EFLAGS_IF;
c->dst.type = OP_NONE; /* Disable writeback. */
break;