From: Yang Zhang <yang.z.zhang@xxxxxxxxx> The follwoing patches are adding the Posted Interrupt supporting to KVM: The first patch enables the feature 'acknowledge interrupt on vmexit'.Since it is required by Posted interrupt, we need to enable it firstly. And the subsequent patches are adding the posted interrupt supporting: Posted Interrupt allows APIC interrupts to inject into guest directly without any vmexit. - When delivering a interrupt to guest, if target vcpu is running, update Posted-interrupt requests bitmap and send a notification event to the vcpu. Then the vcpu will handle this interrupt automatically, without any software involvemnt. - If target vcpu is not running or there already a notification event pending in the vcpu, do nothing. The interrupt will be handled by next vm entry NOTE: We don't turn on the Posted Interrupt until the coalesced issue is solved. Changes from v5 to v6: * Split sync_pir_to_irr into two functions one to query whether PIR is empty and the other to perform the sync. * Add comments to explain how vmx_sync_pir_to_irr() work. * Rebase on top of KVM upstream. Changes from v4 to v5: * Add per cpu count for posted IPI handler. * Dont' check irr when delivering interrupt. Since we can not get interrupt coalesced info with Posted Interrupt. So there is no need to check the irr. There is another patch will changed current interrupt coalesced logic. Before it, we will not turn on Posted Interrupt. * Clear outstanding notification bit after call local_irq_disable, but before check request. As Marcelo suggested, we can ensure the IPI not lost in this way * Remove the spinlock. Same as item 2, if not need to get coalesced info, then no need the lock. * Rebase on top of KVM upstream. Yang Zhang (5): KVM: VMX: Enable acknowledge interupt on vmexit KVM: VMX: Register a new IPI for posted interrupt KVM: VMX: Check the posted interrupt capability KVM: VMX: Add the algorithm of deliver posted interrupt KVM : VMX: Use posted interrupt to deliver virtual interrupt arch/x86/include/asm/entry_arch.h | 4 + arch/x86/include/asm/hardirq.h | 3 + arch/x86/include/asm/hw_irq.h | 1 + arch/x86/include/asm/irq_vectors.h | 5 + arch/x86/include/asm/kvm_host.h | 5 + arch/x86/include/asm/vmx.h | 4 + arch/x86/kernel/entry_64.S | 5 + arch/x86/kernel/irq.c | 22 ++++ arch/x86/kernel/irqinit.c | 4 + arch/x86/kvm/irq.c | 3 +- arch/x86/kvm/lapic.c | 29 ++++- arch/x86/kvm/lapic.h | 2 + arch/x86/kvm/svm.c | 30 +++++ arch/x86/kvm/vmx.c | 223 ++++++++++++++++++++++++++++++++---- arch/x86/kvm/x86.c | 8 +- virt/kvm/kvm_main.c | 1 + 16 files changed, 320 insertions(+), 29 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
