On 02/24/2010 11:54 AM, Jan Kiszka wrote:
Avi Kivity wrote:On 02/24/2010 11:41 AM, Jan Kiszka wrote:Thomas Gleixner wrote:On Tue, 23 Feb 2010, Jan Kiszka wrote:Thomas Gleixner wrote:The i8254/i8259 locks need to be real spinlocks on preempt-rt. Convert them to raw_spinlock. No change for !RT kernels.Doesn't fly for -rt anymore: pic_irq_update runs under this raw lock and calls kvm_vcpu_kick which tries to wake_up some thread -> scheduling while atomic.Hmm, a wakeup itself is fine. Is that code waking a wake queue ?Yes, it's a wake queue.So what's the core issue? Is the lock_t in the wait_queue a sleeping mutex?Yep.
I see. Won't we hit the same issue when we call pic functions from atomic context during the guest entry sequence?
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