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authorRusty Russell <rusty@rustcorp.com.au>2009-06-12 22:27:08 -0600
committerRusty Russell <rusty@rustcorp.com.au>2009-06-12 22:27:09 +0930
commit9f155a9b3d5a5444bcc5e049ec2547bb5107150e (patch)
treeef8fe2d5a319abb3bb1c89374f9d2fef1b0881c3 /drivers/lguest/interrupts_and_traps.c
parent92b4d8df8436cdd74d22a2a5b6b23b9abc737a3e (diff)
downloadop-kernel-dev-9f155a9b3d5a5444bcc5e049ec2547bb5107150e.zip
op-kernel-dev-9f155a9b3d5a5444bcc5e049ec2547bb5107150e.tar.gz
lguest: allow any process to send interrupts
We currently only allow the Launcher process to send interrupts, but it as we already send interrupts from the hrtimer, it's a simple matter of extracting that code into a common set_interrupt routine. As we switch to a thread per virtqueue, this avoids a bottleneck through the main Launcher process. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/interrupts_and_traps.c')
-rw-r--r--drivers/lguest/interrupts_and_traps.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
index 5a10754..0e9067b 100644
--- a/drivers/lguest/interrupts_and_traps.c
+++ b/drivers/lguest/interrupts_and_traps.c
@@ -213,6 +213,20 @@ void try_deliver_interrupt(struct lg_cpu *cpu, unsigned int irq, bool more)
if (!more)
put_user(0, &cpu->lg->lguest_data->irq_pending);
}
+
+/* And this is the routine when we want to set an interrupt for the Guest. */
+void set_interrupt(struct lg_cpu *cpu, unsigned int irq)
+{
+ /* Next time the Guest runs, the core code will see if it can deliver
+ * this interrupt. */
+ set_bit(irq, cpu->irqs_pending);
+
+ /* Make sure it sees it; it might be asleep (eg. halted), or
+ * running the Guest right now, in which case kick_process()
+ * will knock it out. */
+ if (!wake_up_process(cpu->tsk))
+ kick_process(cpu->tsk);
+}
/*:*/
/* Linux uses trap 128 for system calls. Plan9 uses 64, and Ron Minnich sent
@@ -528,10 +542,7 @@ static enum hrtimer_restart clockdev_fn(struct hrtimer *timer)
struct lg_cpu *cpu = container_of(timer, struct lg_cpu, hrt);
/* Remember the first interrupt is the timer interrupt. */
- set_bit(0, cpu->irqs_pending);
- /* Guest may be stopped or running on another CPU. */
- if (!wake_up_process(cpu->tsk))
- kick_process(cpu->tsk);
+ set_interrupt(cpu, 0);
return HRTIMER_NORESTART;
}
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