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[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver

From: Michael S. Tsirkin
Subject: [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver
Date: Sun, 28 Mar 2010 10:47:54 +0300
User-agent: Mutt/1.5.19 (2009-01-05)

On Sat, Mar 27, 2010 at 08:48:34PM +0300, Avi Kivity wrote:
> On 03/26/2010 07:14 PM, Cam Macdonell wrote:
>>> I'm not familiar with the uio internals, but for the interface, an ioctl()
>>> on the fd to assign an eventfd to an MSI vector.  Similar to ioeventfd, but
>>> instead of mapping a doorbell to an eventfd, it maps a real MSI to an
>>> eventfd.
>> uio will never support ioctls.
> Why not?
>> Maybe irqcontrol could be extended?
> What's irqcontrol?

uio accepts 32 bit writes to the char device file. We can encode
the fd number there, and use the high bit to signal assign/deassign.

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

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