Re: [Qemu-devel] Re: [PATCH] qemu: make virtio-blk PCI compliant by default

[Michael S. Tsirkin]

On Tue, Sep 22, 2009 at 05:27:22PM +0300, Avi Kivity wrote:
> On 09/22/2009 05:21 PM, john cooper wrote:
>>> Can we just read this page as a virtqueue command instead of having it
>>> mapped permanently?
>>>      
>> Probably although I hadn't looked specifically
>> at doing so.   Mapping the data via an unused
>> pci bar is pretty trivial and seemed minimally
>> intrusive to the existing driver.
>>    
>
> We'll run out of bars if we expend them like that.

BAR1 is used for MSI-X already (if MSI-X is enabled), you can just add
your data there. I would report the offset within the BAR somewhere
in io space or in configuration space, so that we can relocate tables
later if we like without changing guests.

> -- 
> error compiling committee.c: too many arguments to function