From: Gerd Hoffmann <kraxel@redhat.com>
To: Laine Stump <laine@redhat.com>
Cc: qemu-devel@nongnu.org, Laszlo Ersek <lersek@redhat.com>,
Marcel Apfelbaum <marcel@redhat.com>,
mst@redhat.com, Peter Maydell <peter.maydell@linaro.org>,
Drew Jones <drjones@redhat.com>,
Andrea Bolognani <abologna@redhat.com>,
Alex Williamson <alex.williamson@redhat.com>
Subject: Re: [Qemu-devel] [PATCH RFC] docs: add PCIe devices placement guidelines
Date: Thu, 08 Sep 2016 09:26:05 +0200 [thread overview]
Message-ID: <1473319565.6698.18.camel@redhat.com> (raw)
In-Reply-To: <31ce90c6-8775-dd71-5aaa-ead4a4b24733@redhat.com>
Hi,
> I had understood that the xhci could be a legacy PCI device or a PCI
> Express device depending on the socket it was plugged into (or was that
> possibly just someone doing some hand-waving over the fact that
> obscuring the PCI Express capabilities effectively turns it into a
> legacy PCI device?).
That is correct, it'll work both ways.
> If that's the case, why do you prefer the default
> USB controller to be added in a root-port rather than as an integrated
> device (which is what we do with the group of USB2 controllers, as well
> as the primary video device)
Trying to mimic real hardware as close as possible. The ich9 uhci/ehci
controllers are actually integrated chipset devices. The nec xhci is a
express device in physical hardware.
That is more a personal preference though, there are no strong technical
reasons to do it that way.
cheers,
Gerd
next prev parent reply other threads:[~2016-09-08 7:26 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-01 13:22 [Qemu-devel] [PATCH RFC] docs: add PCIe devices placement guidelines Marcel Apfelbaum
2016-09-01 13:27 ` Peter Maydell
2016-09-01 13:51 ` Marcel Apfelbaum
2016-09-01 17:14 ` Laszlo Ersek
2016-09-05 16:24 ` Laszlo Ersek
2016-09-05 20:02 ` Marcel Apfelbaum
2016-09-06 13:31 ` Laszlo Ersek
2016-09-06 14:46 ` Marcel Apfelbaum
2016-09-07 6:21 ` Gerd Hoffmann
2016-09-07 8:06 ` Laszlo Ersek
2016-09-07 8:23 ` Marcel Apfelbaum
2016-09-07 8:06 ` Marcel Apfelbaum
2016-09-07 16:08 ` Alex Williamson
2016-09-07 19:32 ` Marcel Apfelbaum
2016-09-07 17:55 ` Laine Stump
2016-09-07 19:39 ` Marcel Apfelbaum
2016-09-07 20:34 ` Laine Stump
2016-09-15 8:38 ` Andrew Jones
2016-09-15 14:20 ` Marcel Apfelbaum
2016-09-16 16:50 ` Andrea Bolognani
2016-09-08 7:33 ` Gerd Hoffmann
2016-09-06 11:35 ` Gerd Hoffmann
2016-09-06 13:58 ` Laine Stump
2016-09-07 7:04 ` Gerd Hoffmann
2016-09-07 18:20 ` Laine Stump
2016-09-08 7:26 ` Gerd Hoffmann [this message]
2016-09-06 14:47 ` Marcel Apfelbaum
2016-09-07 7:53 ` Laszlo Ersek
2016-09-07 7:57 ` Marcel Apfelbaum
2016-10-04 14:59 ` Daniel P. Berrange
2016-10-04 15:40 ` Laszlo Ersek
2016-10-04 16:10 ` Laine Stump
2016-10-04 16:43 ` Laszlo Ersek
2016-10-04 18:08 ` Laine Stump
2016-10-04 18:52 ` Alex Williamson
2016-10-10 12:02 ` Andrea Bolognani
2016-10-10 14:36 ` Marcel Apfelbaum
2016-10-11 15:37 ` Andrea Bolognani
2016-10-04 18:56 ` Laszlo Ersek
2016-10-04 17:54 ` Laine Stump
2016-10-05 9:17 ` Marcel Apfelbaum
2016-10-10 11:09 ` Andrea Bolognani
2016-10-10 14:15 ` Marcel Apfelbaum
2016-10-11 13:30 ` Andrea Bolognani
2016-10-04 15:45 ` Alex Williamson
2016-10-04 16:25 ` Laine Stump
2016-10-05 10:03 ` Marcel Apfelbaum
2016-09-06 15:38 ` Alex Williamson
2016-09-06 18:14 ` Marcel Apfelbaum
2016-09-06 18:32 ` Alex Williamson
2016-09-06 18:59 ` Marcel Apfelbaum
2016-09-07 7:44 ` Laszlo Ersek
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