Re: [Qemu-devel] [PATCH v2 04/12] virtio-pci: remove vdev field

[Paolo Bonzini]

Il 15/10/2013 17:40, Michael S. Tsirkin ha scritto:
> On Tue, Oct 15, 2013 at 04:52:45PM +0200, Paolo Bonzini wrote:
>> > @@ -257,7 +271,7 @@ static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy 
>> > *proxy)
>> >  static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
>> >  {
>> >      VirtIOPCIProxy *proxy = opaque;
>> > -    VirtIODevice *vdev = proxy->vdev;
>> > +    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
>> >      hwaddr pa;
>> >  
>> >      switch (addr) {
> Hmm this is also datapath.
> Can this use direct access too, like MSIX?

It's not datapath if you're using ioeventfd, is it?

Anywya, what I did for MSIX is just noticing that a variable was only
used in an "else" branch, and sinking the initialization there.  You
cannot do the same here.

Paolo