From: Radim Krčmář Date: Thu, 8 Oct 2015 18:30:00 +0000 (+0200) Subject: KVM: x86: don't notify userspace IOAPIC on edge EOI X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=13db77347db175a68edd58a79963cdf5cb3a9607;p=deliverable%2Flinux.git KVM: x86: don't notify userspace IOAPIC on edge EOI On real hardware, edge-triggered interrupts don't set a bit in TMR, which means that IOAPIC isn't notified on EOI. Do the same here. Staying in guest/kernel mode after edge EOI is what we want for most devices. If some bugs could be nicely worked around with edge EOI notifications, we should invest in a better interface. Signed-off-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c index c89228980230..8f4499c7ffc1 100644 --- a/arch/x86/kvm/irq_comm.c +++ b/arch/x86/kvm/irq_comm.c @@ -389,13 +389,15 @@ void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap) for (i = 0; i < nr_ioapic_pins; ++i) { hlist_for_each_entry(entry, &table->map[i], link) { u32 dest_id, dest_mode; + bool level; if (entry->type != KVM_IRQ_ROUTING_MSI) continue; dest_id = (entry->msi.address_lo >> 12) & 0xff; dest_mode = (entry->msi.address_lo >> 2) & 0x1; - if (kvm_apic_match_dest(vcpu, NULL, 0, dest_id, - dest_mode)) { + level = entry->msi.data & MSI_DATA_TRIGGER_LEVEL; + if (level && kvm_apic_match_dest(vcpu, NULL, 0, + dest_id, dest_mode)) { u32 vector = entry->msi.data & 0xff; __set_bit(vector,