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| author | Radim Krčmář <rkrcmar@redhat.com> | 2015-10-08 20:30:00 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-10-14 16:41:08 +0200 |
| commit | 13db77347db175a68edd58a79963cdf5cb3a9607 (patch) | |
| tree | a3541835b34f7e1a5593eee1af2391b4eb7e1b19 /arch/x86/kvm/irq_comm.c | |
| parent | KVM: x86: fix edge EOI and IOAPIC reconfig race (diff) | |
| download | linux-13db77347db175a68edd58a79963cdf5cb3a9607.tar.xz linux-13db77347db175a68edd58a79963cdf5cb3a9607.zip | |
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 <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/irq_comm.c')
| -rw-r--r-- | arch/x86/kvm/irq_comm.c | 6 |
1 files changed, 4 insertions, 2 deletions
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, |