lguest: suppress interrupts for single insn, not range.

[linux-2.6-block.git] / drivers / lguest / interrupts_and_traps.c

diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
index 70dfcdc29f1f9e9d8cfc764d69ab7a965daf5c25..6d4c072b61e19e39c2e2c21459d8fef71776fb2e 100644 (file)
--- a/drivers/lguest/interrupts_and_traps.c
+++ b/drivers/lguest/interrupts_and_traps.c
@@ -204,8 +204,7 @@ void try_deliver_interrupt(struct lg_cpu *cpu, unsigned int irq, bool more)
         * They may be in the middle of an iret, where they asked us never to
         * deliver interrupts.
         */
-       if (cpu->regs->eip >= cpu->lg->noirq_start &&
-          (cpu->regs->eip < cpu->lg->noirq_end))
+       if (cpu->regs->eip == cpu->lg->noirq_iret)
                return;
 
        /* If they're halted, interrupts restart them. */
@@ -395,8 +394,9 @@ static bool direct_trap(unsigned int num)
  * The Guest has the ability to turn its interrupt gates into trap gates,
  * if it is careful.  The Host will let trap gates can go directly to the
  * Guest, but the Guest needs the interrupts atomically disabled for an
- * interrupt gate.  It can do this by pointing the trap gate at instructions
- * within noirq_start and noirq_end, where it can safely disable interrupts.
+ * interrupt gate.  The Host could provide a mechanism to register more
+ * "no-interrupt" regions, and the Guest could point the trap gate at
+ * instructions within that region, where it can safely disable interrupts.
  */
 
 /*M:006