From: Tom Lyon <pugs@lyon-about.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
"Hans J. Koch" <hjk@linutronix.de>,
gregkh@suse.de
Subject: Re: [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes
Date: Thu, 1 Apr 2010 12:24:45 -0700 [thread overview]
Message-ID: <201004011224.45336.pugs@lyon-about.com> (raw)
In-Reply-To: <4BB4C591.8000102@redhat.com>
On Thursday 01 April 2010 09:10:57 am Avi Kivity wrote:
> On 04/01/2010 07:06 PM, Tom Lyon wrote:
> > On Thursday 01 April 2010 08:54:14 am Avi Kivity wrote:
> >> On 04/01/2010 06:39 PM, Tom Lyon wrote:
> >>>>> - support for MSI and MSI-X interrupts (the intel 82599 VFs support
> >>>>> only MSI-X)
> >>>>
> >>>> How does a userspace program receive those interrupts?
> >>>
> >>> Same as other UIO drivers - by read()ing an event counter.
> >>
> >> IIRC the usual event counter is /dev/uioX, what's your event counter
> >> now?
> >
> > Exact same mechanism.
>
> But there are multiple msi-x interrupts, how do you know which one
> triggered?
You don't. This would suck for KVM, I guess, but we'd need major rework of the
generic UIO stuff to have a separate event channel for each MSI-X.
For my purposes, collapsing all the MSI-Xs into one MSI-look-alike is fine,
because I'd be using MSI anyways if I could. The weird Intel 82599 VF only
supports MSI-X.
So one big question is - do we expand the whole UIO framework for KVM
requirements, or do we split off either KVM or non-VM into a separate driver?
Hans or Greg - care to opine?
next prev parent reply other threads:[~2010-04-01 19:27 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-01 0:08 [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes Tom Lyon
2010-04-01 0:12 ` [PATCH 1/1] " Tom Lyon
2010-04-09 9:08 ` Joerg Roedel
2010-04-09 16:27 ` Tom Lyon
2010-04-01 9:09 ` [PATCH 0/1] " Avi Kivity
2010-04-01 15:39 ` Tom Lyon
2010-04-01 15:54 ` Avi Kivity
2010-04-01 16:06 ` Tom Lyon
2010-04-01 16:10 ` Avi Kivity
2010-04-01 19:24 ` Tom Lyon [this message]
2010-04-01 20:21 ` Joerg Roedel
2010-04-02 6:43 ` Avi Kivity
2010-04-02 17:05 ` Greg KH
2010-04-09 9:58 ` Avi Kivity
2010-04-09 16:34 ` Tom Lyon
2010-04-09 16:48 ` [PATCH 0/1] uio_pci_generic: extensions to allow access for?non-privileged processes Joerg Roedel
2010-04-09 17:43 ` [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes Avi Kivity
2010-04-09 20:09 ` [PATCH 0/1] uio_pci_generic: extensions to allow access for?non-privileged processes Chris Wright
2010-04-09 20:05 ` [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes Chris Wright
2010-04-01 21:27 ` Tom Lyon
2010-04-02 6:44 ` Avi Kivity
2010-04-01 12:52 ` Joerg Roedel
2010-04-01 15:40 ` Tom Lyon
2010-04-01 16:07 ` Joerg Roedel
2010-04-01 19:18 ` Tom Lyon
2010-04-01 20:09 ` Joerg Roedel
2010-04-01 14:25 ` Michael S. Tsirkin
2010-04-01 16:02 ` Tom Lyon
2010-04-01 16:57 ` Joerg Roedel
2010-04-01 19:08 ` Hans J. Koch
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