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From: Liam Girdwood <liam.r.girdwood@linux.intel.com>
To: David Stevens <stevensd@chromium.org>,
	Stefan Hajnoczi <stefanha@gmail.com>
Cc: geoff@hostfission.com, virtio-dev@lists.oasis-open.org,
	"Alex Lau" <alexlau@chromium.org>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Alexandre Courbot" <acourbot@chromium.org>,
	qemu-devel@nongnu.org, "Tomasz Figa" <tfiga@chromium.org>,
	"Keiichi Watanabe" <keiichiw@chromium.org>,
	"Gerd Hoffmann" <kraxel@redhat.com>,
	"Hans Verkuil" <hverkuil@xs4all.nl>,
	"Stéphane Marchesin" <marcheu@chromium.org>,
	"Dylan Reid" <dgreid@chromium.org>,
	"Gurchetan Singh" <gurchetansingh@chromium.org>,
	"Dmitry Morozov" <dmitry.morozov@opensynergy.com>,
	"Pawel Osciak" <posciak@chromium.org>,
	"Linux Media Mailing List" <linux-media@vger.kernel.org>
Subject: Re: [virtio-dev] Re: guest / host buffer sharing ...
Date: Mon, 11 Nov 2019 15:36:38 +0000	[thread overview]
Message-ID: <c8a6b6f35664ce036c2a48ec41eab97b0f40704d.camel@linux.intel.com> (raw)
In-Reply-To: <CAD=HUj41r8wHZ2-By8tLftkoqC5r_Bw=pr=zX2aZ7GTs1ESWhg@mail.gmail.com>

On Mon, 2019-11-11 at 12:04 +0900, David Stevens wrote:
> Having a centralized buffer allocator device is one way to deal with
> sharing buffers, since it gives a definitive buffer identifier that
> can be used by all drivers/devices to refer to the buffer. That being
> said, I think the device as proposed is insufficient, as such a
> centralized buffer allocator should probably be responsible for
> allocating all shared buffers, not just linear guest ram buffers.

This would work for audio. I need to be able to :-

1) Allocate buffers on guests that I can pass as SG physical pages to
DMA engine (via privileged VM driver) for audio data. Can be any memory
as long as it's DMA-able.

2) Export hardware mailbox memory (in a real device PCI BAR) as RO to
each guest to give guests low latency information on each audio stream.
To support use cases like voice calls, gaming, system notifications and
general audio processing.

Liam



  reply	other threads:[~2019-11-11 17:45 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-05 10:54 guest / host buffer sharing Gerd Hoffmann
2019-11-05 11:35 ` Geoffrey McRae
2019-11-06  6:24   ` Gerd Hoffmann
2019-11-06  8:36 ` David Stevens
2019-11-06 12:41   ` Gerd Hoffmann
2019-11-06 22:28     ` Geoffrey McRae
2019-11-07  6:48       ` Gerd Hoffmann
2019-11-20 12:13       ` Tomasz Figa
2019-11-20 21:41         ` Geoffrey McRae
2019-11-21  5:51           ` Tomasz Figa
2019-12-04 22:22             ` Dylan Reid
2019-12-11  5:08               ` David Stevens
2019-12-11  9:26                 ` Gerd Hoffmann
2019-12-11 16:05                   ` [virtio-dev] " Enrico Granata
2019-12-12  6:40                   ` David Stevens
2019-12-12  9:41                     ` Gerd Hoffmann
2019-12-12 12:26                       ` David Stevens
2019-12-12 13:30                         ` Gerd Hoffmann
2019-12-13  3:21                           ` David Stevens
2019-12-16 13:47                             ` Gerd Hoffmann
2019-12-17 12:59                               ` David Stevens
2019-11-06  8:43 ` Stefan Hajnoczi
2019-11-06  9:51   ` Gerd Hoffmann
2019-11-06 10:10     ` [virtio-dev] " Dr. David Alan Gilbert
2019-11-07 11:11       ` Gerd Hoffmann
2019-11-07 11:16         ` Dr. David Alan Gilbert
2019-11-08  6:45           ` Gerd Hoffmann
2019-11-06 11:46     ` Stefan Hajnoczi
2019-11-06 12:50       ` Gerd Hoffmann
2019-11-07 12:10         ` Stefan Hajnoczi
2019-11-07 15:10           ` Frank Yang
2019-11-20 11:58             ` Tomasz Figa
2019-11-08  7:22           ` Gerd Hoffmann
2019-11-08  7:35             ` Stefan Hajnoczi
2019-11-09  1:41               ` Stéphane Marchesin
2019-11-09 10:12                 ` Stefan Hajnoczi
2019-11-09 11:16                   ` Tomasz Figa
2019-11-09 12:08                     ` Stefan Hajnoczi
2019-11-09 15:12                       ` Tomasz Figa
2019-11-18 10:20                         ` Stefan Hajnoczi
2019-11-20 10:11                           ` Tomasz Figa
2019-11-20 12:11     ` Tomasz Figa
2019-11-11  3:04   ` David Stevens
2019-11-11 15:36     ` Liam Girdwood [this message]
2019-11-12  0:54       ` [virtio-dev] " Gurchetan Singh
2019-11-12 13:56         ` Liam Girdwood
2019-11-12 22:55           ` Gurchetan Singh
2019-11-19 15:31             ` Liam Girdwood
2019-11-20  0:42               ` Gurchetan Singh
2019-11-20  9:53               ` Gerd Hoffmann
2019-11-25 16:46                 ` Liam Girdwood
2019-11-27  7:58                   ` Gerd Hoffmann

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