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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:27:08 -0600 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:27:09 +0930 |
| commit | 9f155a9b3d5a5444bcc5e049ec2547bb5107150e (patch) | |
| tree | ef8fe2d5a319abb3bb1c89374f9d2fef1b0881c3 | |
| parent | 92b4d8df8436cdd74d22a2a5b6b23b9abc737a3e (diff) | |
| download | linux-stable-9f155a9b3d5a5444bcc5e049ec2547bb5107150e.tar.gz linux-stable-9f155a9b3d5a5444bcc5e049ec2547bb5107150e.tar.bz2 linux-stable-9f155a9b3d5a5444bcc5e049ec2547bb5107150e.zip | |
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>
| -rw-r--r-- | drivers/lguest/interrupts_and_traps.c | 19 | ||||
| -rw-r--r-- | drivers/lguest/lg.h | 1 | ||||
| -rw-r--r-- | drivers/lguest/lguest_user.c | 10 |
3 files changed, 18 insertions, 12 deletions
diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 5a10754b4790..0e9067b0d507 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; } diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 6201ce59e886..040cb70780e7 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -143,6 +143,7 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user); /* interrupts_and_traps.c: */ unsigned int interrupt_pending(struct lg_cpu *cpu, bool *more); void try_deliver_interrupt(struct lg_cpu *cpu, unsigned int irq, bool more); +void set_interrupt(struct lg_cpu *cpu, unsigned int irq); bool deliver_trap(struct lg_cpu *cpu, unsigned int num); void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int i, u32 low, u32 hi); diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c index bcdcf3453e78..1982b45bd935 100644 --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -45,9 +45,8 @@ static int user_send_irq(struct lg_cpu *cpu, const unsigned long __user *input) return -EFAULT; if (irq >= LGUEST_IRQS) return -EINVAL; - /* Next time the Guest runs, the core code will see if it can deliver - * this interrupt. */ - set_bit(irq, cpu->irqs_pending); + + set_interrupt(cpu, irq); return 0; } @@ -252,11 +251,6 @@ static ssize_t write(struct file *file, const char __user *in, /* Once the Guest is dead, you can only read() why it died. */ if (lg->dead) return -ENOENT; - - /* If you're not the task which owns the Guest, all you can do - * is break the Launcher out of running the Guest. */ - if (current != cpu->tsk && req != LHREQ_BREAK) - return -EPERM; } switch (req) { |