Re: [virtio-dev] Re: [PATCH 4/6] vhost_vdpa: support doorbell mapping via mmap

2020-06-01 Thread Jason Wang
On 2020/5/30 上午2:30, Rob Miller wrote: Given the need for 4K doorbell such that QEMU can easily map, ect, and assuming that I have a HW device which exposes 2 VQ's, with a notification area off of BAR3, offset=whatever, notifier_multiplier=4, we don't need to have 2 x 4K pages mapped into the

[virtio-dev] Re: [PATCH 4/6] vhost_vdpa: support doorbell mapping via mmap

2020-05-29 Thread Rob Miller
Given the need for 4K doorbell such that QEMU can easily map, ect, and assuming that I have a HW device which exposes 2 VQ's, with a notification area off of BAR3, offset=whatever, notifier_multiplier=4, we don't need to have 2 x 4K pages mapped into the VM for both doorbells do we? The guest drive