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authorPeter Xu <peterx@redhat.com>2016-07-14 13:56:25 +0800
committerMichael S. Tsirkin <mst@redhat.com>2016-07-21 20:43:49 +0300
commit8b5ed7dffa1fa2835a782a8db8d4f3f1f772ada9 (patch)
tree39b35e66fe3b74b20887d41fb9774d7605617f8d /gdb-xml
parentc15fa0bea982766c5c3de28d1abd245e3c44a17f (diff)
intel_iommu: add support for split irqchip
In split irqchip mode, IOAPIC is working in user space, only update kernel irq routes when entry changed. When IR is enabled, we directly update the kernel with translated messages. It works just like a kernel cache for the remapping entries. Since KVM irqfd is using kernel gsi routes to deliver interrupts, as long as we can support split irqchip, we will support irqfd as well. Also, since kernel gsi routes will cache translated interrupts, irqfd delivery will not suffer from any performance impact due to IR. And, since we supported irqfd, vhost devices will be able to work seamlessly with IR now. Logically this should contain both vhost-net and vhost-user case. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> [move trace-events lines into target-i386/trace-events] Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'gdb-xml')
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