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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:27:01 -0600 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:27:01 +0930 |
| commit | a6c372de6e4b9a8188b66badcee3e3792eccdd26 (patch) | |
| tree | b6b67f4cc447cc0ee8ae617bb503ef7d7f6e4958 /drivers/lguest | |
| parent | b43e352139f51216a8c56b0bd5fc3d4e05c65619 (diff) | |
| download | lwn-a6c372de6e4b9a8188b66badcee3e3792eccdd26.tar.gz lwn-a6c372de6e4b9a8188b66badcee3e3792eccdd26.zip | |
lguest: fix lguest wake on guest clock tick, or fd activity
The Launcher could be inside the Guest on another CPU; wake_up_process
will do nothing because it is "running". kick_process will knock it
back into our kernel in this case, otherwise we'll miss it until the
next guest exit.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest')
| -rw-r--r-- | drivers/lguest/interrupts_and_traps.c | 6 | ||||
| -rw-r--r-- | drivers/lguest/lguest_user.c | 4 |
2 files changed, 5 insertions, 5 deletions
diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 6e99adbe1946..9ea26ad88c9d 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -511,9 +511,9 @@ static enum hrtimer_restart clockdev_fn(struct hrtimer *timer) /* Remember the first interrupt is the timer interrupt. */ set_bit(0, cpu->irqs_pending); - /* If the Guest is actually stopped, we need to wake it up. */ - if (cpu->halted) - wake_up_process(cpu->tsk); + /* Guest may be stopped or running on another CPU. */ + if (!wake_up_process(cpu->tsk)) + kick_process(cpu->tsk); return HRTIMER_NORESTART; } diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c index b8ee103eed5f..bcdcf3453e78 100644 --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -24,8 +24,8 @@ static int break_guest_out(struct lg_cpu *cpu, const unsigned long __user*input) if (on) { cpu->break_out = 1; - /* Pop it out of the Guest (may be running on different CPU) */ - wake_up_process(cpu->tsk); + if (!wake_up_process(cpu->tsk)) + kick_process(cpu->tsk); /* Wait for them to reset it */ return wait_event_interruptible(cpu->break_wq, !cpu->break_out); } else { |