Yeah I decided to change the name of the series. Since fine grained locking is not the main objective of the series. kvm->irq_lock protects too much stuff, but still fail to protect everything it was design to protect (see ack notifiers call in pic). I want to make IRQ injection fast path as lockless as possible. This patch series split kvm->irq_lock mutex to smaller spinlocks each one protects only one thing. Irq routing, irq notifier lists and ioapic gain their own spinlock. pic is already uses its own lock. This patch series also makes interrupt injection to lapic lockless (several kvm_irq_delivery_to_apic() may run in parallel), but access to lapic was never fully locked in the first place. VCPU could access lapic in parallel with interrupt injection. Patch 10 changes irq routing data structure to much more efficient one. Patch 11 introduce API that allows to send MSI message without going through irq routing table. This allows us among other thing to limit irq routing table to a small number of entries. This version of the patch series fix range checking in patch 10 and ioapic lock is no longer dropped during irq notifiers run. Patch 11 is a new one. Gleb Natapov (11): Move irq routing data structure to rcu locking Unregister ack notifier callback on PIT freeing. Move irq ack notifier list to arch independent code. Convert irq notifiers lists to RCU locking. Protect irq_sources_bitmap by kvm->lock instead of kvm->irq_lock Move irq routing to its own locking. Move irq notifiers lists to its own locking. Move IO APIC to its own lock. Drop kvm->irq_lock lock. Change irq routing table to use gsi indexed array. Introduce MSI message sending interface that bypass IRQ routing. arch/ia64/include/asm/kvm_host.h | 1 - arch/ia64/kvm/kvm-ia64.c | 55 +++++++++-- arch/x86/include/asm/kvm_host.h | 3 +- arch/x86/kvm/i8254.c | 6 +- arch/x86/kvm/i8259.c | 2 +- arch/x86/kvm/lapic.c | 7 +- arch/x86/kvm/x86.c | 58 +++++++++--- include/linux/kvm.h | 10 ++- include/linux/kvm_host.h | 21 +++- virt/kvm/eventfd.c | 2 - virt/kvm/ioapic.c | 53 +++++++---- virt/kvm/ioapic.h | 4 +- virt/kvm/irq_comm.c | 195 +++++++++++++++++++++---------------- virt/kvm/kvm_main.c | 11 +- 14 files changed, 275 insertions(+), 153 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
