From: "Michael S. Tsirkin" <mst@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: Cam Macdonell <cam@cs.ualberta.ca>,
kvm@vger.kernel.org, qemu-devel@nongnu.org
Subject: Re: [PATCH v3 1/1] Shared memory uio_pci driver
Date: Sun, 28 Mar 2010 10:47:54 +0300 [thread overview]
Message-ID: <20100328074754.GA21749@redhat.com> (raw)
In-Reply-To: <4BAE44F2.20801@redhat.com>
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.
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: Cam Macdonell <cam@cs.ualberta.ca>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver
Date: Sun, 28 Mar 2010 10:47:54 +0300 [thread overview]
Message-ID: <20100328074754.GA21749@redhat.com> (raw)
In-Reply-To: <4BAE44F2.20801@redhat.com>
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.
next prev parent reply other threads:[~2010-03-28 7:51 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-25 6:09 [PATCH v3 1/1] Shared memory uio_pci driver Cam Macdonell
2010-03-25 6:09 ` [Qemu-devel] " Cam Macdonell
2010-03-25 9:05 ` Michael S. Tsirkin
2010-03-25 9:05 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-25 9:47 ` Avi Kivity
2010-03-25 9:47 ` [Qemu-devel] " Avi Kivity
2010-03-25 16:30 ` Cam Macdonell
2010-03-25 16:30 ` [Qemu-devel] " Cam Macdonell
2010-03-25 16:34 ` Michael S. Tsirkin
2010-03-25 16:34 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-25 17:07 ` Cam Macdonell
2010-03-25 17:07 ` [Qemu-devel] " Cam Macdonell
2010-03-25 16:36 ` Avi Kivity
2010-03-25 16:36 ` [Qemu-devel] " Avi Kivity
2010-03-25 16:37 ` Michael S. Tsirkin
2010-03-25 16:37 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-25 16:51 ` Avi Kivity
2010-03-25 16:51 ` [Qemu-devel] " Avi Kivity
2010-03-25 9:15 ` Michael S. Tsirkin
2010-03-25 9:15 ` Michael S. Tsirkin
2010-03-25 9:15 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-25 9:40 ` Avi Kivity
2010-03-25 9:40 ` Avi Kivity
2010-03-25 9:40 ` [Qemu-devel] " Avi Kivity
2010-03-25 9:44 ` Michael S. Tsirkin
2010-03-25 9:44 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-25 9:58 ` Avi Kivity
2010-03-25 9:58 ` [Qemu-devel] " Avi Kivity
2010-03-25 10:07 ` Michael S. Tsirkin
2010-03-25 10:07 ` Michael S. Tsirkin
2010-03-25 10:07 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-25 9:58 ` Avi Kivity
2010-03-25 9:44 ` Michael S. Tsirkin
2010-03-25 16:18 ` Cam Macdonell
2010-03-25 16:18 ` Cam Macdonell
2010-03-25 16:18 ` [Qemu-devel] " Cam Macdonell
2010-03-25 16:23 ` Anthony Liguori
2010-03-25 16:23 ` Anthony Liguori
2010-03-25 16:23 ` [Qemu-devel] " Anthony Liguori
2010-03-25 16:32 ` Avi Kivity
2010-03-25 16:32 ` Avi Kivity
2010-03-25 16:32 ` [Qemu-devel] " Avi Kivity
2010-03-25 16:40 ` Michael S. Tsirkin
2010-03-25 16:40 ` Michael S. Tsirkin
2010-03-25 16:40 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-25 16:50 ` Avi Kivity
2010-03-25 16:50 ` [Qemu-devel] " Avi Kivity
2010-03-25 16:50 ` Avi Kivity
2010-03-25 16:33 ` Michael S. Tsirkin
2010-03-25 16:33 ` Michael S. Tsirkin
2010-03-25 16:33 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-25 9:46 ` Avi Kivity
2010-03-25 9:46 ` [Qemu-devel] " Avi Kivity
2010-03-25 16:24 ` Cam Macdonell
2010-03-25 16:24 ` [Qemu-devel] " Cam Macdonell
2010-03-25 16:35 ` Avi Kivity
2010-03-25 16:35 ` [Qemu-devel] " Avi Kivity
2010-03-26 16:14 ` Cam Macdonell
2010-03-26 16:14 ` [Qemu-devel] " Cam Macdonell
2010-03-27 17:48 ` Avi Kivity
2010-03-27 17:48 ` [Qemu-devel] " Avi Kivity
2010-03-28 7:47 ` Michael S. Tsirkin [this message]
2010-03-28 7:47 ` Michael S. Tsirkin
2010-03-28 8:02 ` Avi Kivity
2010-03-28 8:02 ` [Qemu-devel] " Avi Kivity
2010-03-28 9:40 ` Michael S. Tsirkin
2010-03-28 9:40 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-28 9:45 ` Avi Kivity
2010-03-28 9:45 ` [Qemu-devel] " Avi Kivity
2010-03-28 10:31 ` Michael S. Tsirkin
2010-03-28 10:31 ` [Qemu-devel] " Michael S. Tsirkin
2010-03-28 11:12 ` Avi Kivity
2010-03-28 11:12 ` [Qemu-devel] " Avi Kivity
2010-03-28 13:28 ` Jamie Lokier
2010-03-28 13:28 ` Jamie Lokier
2010-03-28 13:47 ` malc
2010-03-28 13:47 ` malc
2010-03-28 19:48 ` Cam Macdonell
2010-03-28 19:48 ` [Qemu-devel] " Cam Macdonell
2010-03-29 20:59 ` Avi Kivity
2010-03-29 20:59 ` [Qemu-devel] " Avi Kivity
2010-03-30 14:52 ` Cam Macdonell
2010-03-30 14:52 ` [Qemu-devel] " Cam Macdonell
2010-04-01 8:59 ` Avi Kivity
2010-04-01 8:59 ` [Qemu-devel] " Avi Kivity
2010-03-31 9:12 ` Michael S. Tsirkin
2010-03-31 9:12 ` [Qemu-devel] " Michael S. Tsirkin
2010-04-01 8:58 ` Avi Kivity
2010-04-01 8:58 ` [Qemu-devel] " Avi Kivity
2010-04-01 10:59 ` Michael S. Tsirkin
2010-04-01 10:59 ` [Qemu-devel] " Michael S. Tsirkin
2010-04-01 11:27 ` Avi Kivity
2010-04-01 11:27 ` [Qemu-devel] " Avi Kivity
2010-03-25 16:42 ` Michael S. Tsirkin
2010-03-25 16:42 ` [Qemu-devel] " Michael S. Tsirkin
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