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-rw-r--r--drivers/lguest/lguest.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c
index 7e7e9fb3aef..6dfe568523a 100644
--- a/drivers/lguest/lguest.c
+++ b/drivers/lguest/lguest.c
@@ -250,6 +250,14 @@ static void irq_enable(void)
{
lguest_data.irq_enabled = X86_EFLAGS_IF;
}
+/*:*/
+/*M:003 Note that we don't check for outstanding interrupts when we re-enable
+ * them (or when we unmask an interrupt). This seems to work for the moment,
+ * since interrupts are rare and we'll just get the interrupt on the next timer
+ * tick, but when we turn on CONFIG_NO_HZ, we should revisit this. One way
+ * would be to put the "irq_enabled" field in a page by itself, and have the
+ * Host write-protect it when an interrupt comes in when irqs are disabled.
+ * There will then be a page fault as soon as interrupts are re-enabled. :*/
/*G:034
* The Interrupt Descriptor Table (IDT).