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-rw-r--r--arch/i386/kernel/entry.S16
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
index ffb236544270..32980b834935 100644
--- a/arch/i386/kernel/entry.S
+++ b/arch/i386/kernel/entry.S
@@ -1030,7 +1030,21 @@ ENTRY(xen_hypervisor_callback)
CFI_ADJUST_CFA_OFFSET 4
SAVE_ALL
TRACE_IRQS_OFF
- mov %esp, %eax
+
+ /* Check to see if we got the event in the critical
+ region in xen_iret_direct, after we've reenabled
+ events and checked for pending events. This simulates
+ iret instruction's behaviour where it delivers a
+ pending interrupt when enabling interrupts. */
+ movl PT_EIP(%esp),%eax
+ cmpl $xen_iret_start_crit,%eax
+ jb 1f
+ cmpl $xen_iret_end_crit,%eax
+ jae 1f
+
+ call xen_iret_crit_fixup
+
+1: mov %esp, %eax
call xen_evtchn_do_upcall
jmp ret_from_intr
CFI_ENDPROC