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From: | Avi Kivity |
Subject: | [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver |
Date: | Thu, 25 Mar 2010 18:35:07 +0200 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100301 Fedora/3.0.3-1.fc12 Thunderbird/3.0.3 |
On 03/25/2010 06:24 PM, Cam Macdonell wrote:
There is now a generic PCI 2.3 driver that can handle all PCI devices. It doesn't support MSI, but if we add MSI support then it can be used without the need for a specialized driver.Agreed, I'd be happy to use the generic driver if MSI is there. What would MSI support for UIO look like? An array of "struct uio_irq" for the different vectors?
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.
That would be very useful for device assignment: we can pick up a uio device, map its vectors, and give them to a guest.
-- error compiling committee.c: too many arguments to function
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