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From: Li Liu <john.liuli at huawei.com> Add a new register offset VIRTIO_MMIO_ISRMEM which help to estblish a shared memory region between virtio-mmio driver and qemu with two purposes: 1.Guest virtio-mmio driver can get the interrupt reason. 2.Check irqfd enabled or not to register different irq handler. Signed-off-by: Li Liu <john.liuli at huawei.com> --- drivers/virtio/...

On Sat, Oct 25, 2014 at 04:24:53PM +0800, john.liuli wrote: > From: Li Liu <john.liuli at huawei.com> > > Add a new register offset VIRTIO_MMIO_ISRMEM which help to > estblish a shared memory region between virtio-mmio driver > and qemu with two purposes: > > 1.Guest virtio-mmio driver can get the interrupt reason. > 2.Check irqfd enabled or not to register different irq handler. > > Signed-off-by: Li Liu <john.liuli at...

...eue operations". Vhost module don't update the ISR register, so if with only one irq then it's no way to get the interrupt reason even we can inject the irq correctly. To get the interrupt reason to support such VIRTIO_NET_F_STATUS features I add a new register offset VIRTIO_MMIO_ISRMEM which will help to establish a shared memory region between qemu and virtio-mmio device. Then the interrupt reason can be accessed by guest driver through this region. At the same time, the virtio-mmio dirver check this region to see irqfd is supported or not during the irq handler registration...

...eue operations". Vhost module don't update the ISR register, so if with only one irq then it's no way to get the interrupt reason even we can inject the irq correctly. To get the interrupt reason to support such VIRTIO_NET_F_STATUS features I add a new register offset VIRTIO_MMIO_ISRMEM which will help to establish a shared memory region between qemu and virtio-mmio device. Then the interrupt reason can be accessed by guest driver through this region. At the same time, the virtio-mmio dirver check this region to see irqfd is supported or not during the irq handler registration...