[Qemu-devel] Re: [PATCH v4] Shared memory uio_pci driver

[Avi Kivity]

On 04/08/2010 02:00 AM, Cam Macdonell wrote:
> This patch adds a driver for my shared memory PCI device using the uio_pci
> interface.  The driver has three memory regions.  The first memory region is for
> device registers for sending interrupts. The second BAR is for receiving MSI-X
> interrupts and the third memory region maps the shared memory.  The device only
> exports the first and third memory regions to userspace.
>
> This driver supports MSI-X and regular pin interrupts.  Currently, the number
> of MSI vectors is set to 2 (one for new connections and the other for
> interrupts) but it could easily be increased.  If MSI is not available, then
> regular interrupts will be used.
>
> This version added formatting and style corrections as well as better
> error-checking and cleanup when errors occur.
>
>    

There is work now to bring msi to the generic pci 2.3 driver, perhaps we 
can use that instead.  From a quick look it looks fine.

--
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.