From: "Michael S. Tsirkin" <mst@redhat.com>
To: "Sjur Brændeland" <sjurbren@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Amit Shah <amit.shah@redhat.com>
Subject: Re: [RFC 1/2] virtio_console: Add support for DMA memory allocation
Date: Tue, 4 Sep 2012 21:55:41 +0300 [thread overview]
Message-ID: <20120904185541.GB3602@redhat.com> (raw)
In-Reply-To: <CAJK669Z1UYakBWartChfoeKL_eU5=GFZMGhH8R_Q-difVm0ygQ@mail.gmail.com>
On Tue, Sep 04, 2012 at 06:58:47PM +0200, Sjur Brændeland wrote:
> Hi Michael,
>
> > Exactly. Though if we just fail load it will be much less code.
> >
> > Generally, using a feature bit for this is a bit of a problem though:
> > normally driver is expected to be able to simply ignore
> > a feature bit. In this case driver is required to
> > do something so a feature bit is not a good fit.
> > I am not sure what the right thing to do is.
>
> I see - so in order to avoid the binding between driver and device
> there are two options I guess. Either make virtio_dev_match() or
> virtcons_probe() fail. Neither of them seems like the obvious choice.
>
> Maybe adding a check for VIRTIO_CONSOLE_F_DMA_MEM match
> between device and driver in virtcons_probe() is the lesser evil?
>
> Regards,
> Sjur
A simplest thing to do is change dev id. rusty?
--
MST
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com>
To: "Sjur Brændeland" <sjurbren@gmail.com>
Cc: Amit Shah <amit.shah@redhat.com>,
linux-kernel@vger.kernel.org,
Rusty Russell <rusty@rustcorp.com.au>,
Ohad Ben-Cohen <ohad@wizery.com>,
Linus Walleij <linus.walleij@linaro.org>,
virtualization@lists.linux-foundation.org
Subject: Re: [RFC 1/2] virtio_console: Add support for DMA memory allocation
Date: Tue, 4 Sep 2012 21:55:41 +0300 [thread overview]
Message-ID: <20120904185541.GB3602@redhat.com> (raw)
In-Reply-To: <CAJK669Z1UYakBWartChfoeKL_eU5=GFZMGhH8R_Q-difVm0ygQ@mail.gmail.com>
On Tue, Sep 04, 2012 at 06:58:47PM +0200, Sjur Brændeland wrote:
> Hi Michael,
>
> > Exactly. Though if we just fail load it will be much less code.
> >
> > Generally, using a feature bit for this is a bit of a problem though:
> > normally driver is expected to be able to simply ignore
> > a feature bit. In this case driver is required to
> > do something so a feature bit is not a good fit.
> > I am not sure what the right thing to do is.
>
> I see - so in order to avoid the binding between driver and device
> there are two options I guess. Either make virtio_dev_match() or
> virtcons_probe() fail. Neither of them seems like the obvious choice.
>
> Maybe adding a check for VIRTIO_CONSOLE_F_DMA_MEM match
> between device and driver in virtcons_probe() is the lesser evil?
>
> Regards,
> Sjur
A simplest thing to do is change dev id. rusty?
--
MST
next prev parent reply other threads:[~2012-09-04 18:55 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-03 13:51 [RFC 1/2] virtio_console: Add support for DMA memory allocation sjur.brandeland
2012-09-03 13:51 ` [RFC 2/2] virtio_console: Add feature to disable console port sjur.brandeland
2012-09-03 13:51 ` sjur.brandeland
2012-09-03 14:30 ` [RFC 1/2] virtio_console: Add support for DMA memory allocation Michael S. Tsirkin
2012-09-03 14:30 ` Michael S. Tsirkin
2012-09-03 14:57 ` Sjur Brændeland
2012-09-03 14:57 ` Sjur Brændeland
2012-09-03 20:27 ` Michael S. Tsirkin
2012-09-03 20:27 ` Michael S. Tsirkin
2012-09-04 6:07 ` Rusty Russell
2012-09-04 6:07 ` Rusty Russell
2012-09-05 13:00 ` Sjur Brændeland
2012-09-05 13:00 ` Sjur Brændeland
2012-09-05 14:35 ` Michael S. Tsirkin
2012-09-05 14:35 ` Michael S. Tsirkin
2012-09-05 18:15 ` Sjur Brændeland
2012-09-05 18:15 ` Sjur Brændeland
2012-09-05 19:16 ` Michael S. Tsirkin
2012-09-05 19:16 ` Michael S. Tsirkin
2012-09-07 9:24 ` Sjur Brændeland
2012-09-07 9:24 ` Sjur Brændeland
2012-09-04 11:28 ` Sjur Brændeland
2012-09-04 11:28 ` Sjur Brændeland
2012-09-04 13:50 ` Michael S. Tsirkin
2012-09-04 13:50 ` Michael S. Tsirkin
2012-09-04 16:58 ` Sjur Brændeland
2012-09-04 16:58 ` Sjur Brændeland
2012-09-04 18:55 ` Michael S. Tsirkin [this message]
2012-09-04 18:55 ` Michael S. Tsirkin
2012-09-06 2:04 ` Rusty Russell
2012-09-06 2:04 ` Rusty Russell
2012-09-06 5:27 ` Michael S. Tsirkin
2012-09-06 5:27 ` Michael S. Tsirkin
2012-09-10 22:11 ` Michael S. Tsirkin
2012-09-10 22:11 ` Michael S. Tsirkin
2012-09-12 6:24 ` Rusty Russell
2012-09-12 6:24 ` Rusty Russell
2012-09-07 8:35 ` Sjur Brændeland
2012-09-07 8:35 ` Sjur Brændeland
2012-09-16 9:44 ` [PATCH repost] virtio: don't crash when device is buggy Michael S. Tsirkin
2012-09-16 9:44 ` Michael S. Tsirkin
2012-09-17 4:27 ` Rusty Russell
2012-09-17 4:27 ` Rusty Russell
2012-09-18 22:24 ` Michael S. Tsirkin
2012-09-18 22:24 ` Michael S. Tsirkin
2012-09-19 4:10 ` Rusty Russell
2012-09-19 4:10 ` Rusty Russell
-- strict thread matches above, loose matches on Subject: below --
2012-09-03 13:51 [RFC 1/2] virtio_console: Add support for DMA memory allocation sjur.brandeland
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