From: Stefano Stabellini <sstabellini@kernel.org>
To: Rahul Singh <Rahul.Singh@arm.com>
Cc: "Stefano Stabellini" <sstabellini@kernel.org>,
xen-devel <xen-devel@lists.xenproject.org>,
"Bertrand Marquis" <Bertrand.Marquis@arm.com>,
"Julien Grall" <julien@xen.org>,
"Volodymyr Babchuk" <Volodymyr_Babchuk@epam.com>,
"Jan Beulich" <jbeulich@suse.com>, "Paul Durrant" <paul@xen.org>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [PATCH v1 11/14] xen/arm: Enable the existing x86 virtual PCI support for ARM.
Date: Thu, 16 Sep 2021 13:26:52 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.21.2109161324200.21985@sstabellini-ThinkPad-T480s> (raw)
In-Reply-To: <A90145B0-DD30-4300-8248-73104C782172@arm.com>
[-- Attachment #1: Type: text/plain, Size: 1358 bytes --]
On Thu, 16 Sep 2021, Rahul Singh wrote:
> Hi Stefano,
>
> > On 10 Sep 2021, at 1:26 am, Stefano Stabellini <sstabellini@kernel.org> wrote:
> >
> > On Thu, 19 Aug 2021, Rahul Singh wrote:
> >> The existing VPCI support available for X86 is adapted for Arm.
> >> When the device is added to XEN via the hyper call
> >> “PHYSDEVOP_pci_device_add”, VPCI handler for the config space
> >> access is added to the Xen to emulate the PCI devices config space.
> >
> > This is done just for device discovery, right?
> >
> > Although it is currently not implemented (and I am not asking to
> > implement it now, I am only trying to understand the architecture), it
> > would be possible to discover all PCI devices just by walking down the
> > PCI hierarchy by ourselves in Xen (no Dom0 interactions) given that we
> > have an ECAM driver.
> >
> > I take that would be the way to implement PCI support for Dom0less?
>
> It is not possible to discover PCI devices in XEN if enumeration is not done before XEN boot.
> If boot firmware did the enumeration, XEN will discover the PCI device.
OK, but if the boot firmware does the enumeration, how will Xen discover
the PCI device exactly? Will Xen discover it because the PCI device will
be present in device tree explicitly (will have its own device tree
node)? Or will Xen discover it by walking the PCI bus?
next prev parent reply other threads:[~2021-09-16 20:27 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-19 12:02 [PATCH v1 00/14] PCI devices passthrough on Arm Rahul Singh
2021-08-19 12:02 ` [PATCH v1 01/14] xen/pci: Refactor MSI code that implements MSI functionality within XEN Rahul Singh
2021-08-19 12:18 ` Julien Grall
2021-08-19 14:16 ` Rahul Singh
2021-09-07 10:01 ` Julien Grall
2021-08-24 15:53 ` Jan Beulich
2021-08-31 12:31 ` Rahul Singh
2021-08-31 13:00 ` Jan Beulich
2021-08-26 13:23 ` Daniel P. Smith
2021-08-19 12:02 ` [PATCH v1 02/14] xen/pci: solve compilation error on ARM with HAS_PCI enabled Rahul Singh
2021-08-19 12:28 ` Julien Grall
2021-08-20 10:30 ` Rahul Singh
2021-08-20 11:37 ` Julien Grall
2021-08-20 11:55 ` Jan Beulich
2021-08-20 12:10 ` Julien Grall
2021-08-20 7:01 ` Jan Beulich
2021-08-20 11:21 ` Rahul Singh
2021-09-09 13:16 ` Julien Grall
2021-08-19 12:02 ` [PATCH v1 03/14] xen/pci: solve compilation error on ARM with ACPI && HAS_PCI Rahul Singh
2021-08-20 7:06 ` Jan Beulich
2021-08-20 11:41 ` Rahul Singh
2021-08-20 11:54 ` Jan Beulich
2021-09-09 1:11 ` Stefano Stabellini
2021-09-10 10:22 ` Rahul Singh
2021-08-19 12:02 ` [PATCH v1 04/14] xen/arm: Add support for PCI init to initialize the PCI driver Rahul Singh
2021-09-07 8:20 ` Julien Grall
2021-09-10 10:47 ` Rahul Singh
2021-09-09 1:16 ` Stefano Stabellini
2021-09-10 10:32 ` Rahul Singh
2021-08-19 12:02 ` [PATCH v1 05/14] xen/arm: PCI host bridge discovery within XEN on ARM Rahul Singh
2021-09-07 9:05 ` Julien Grall
2021-09-10 11:22 ` Rahul Singh
2021-09-10 11:53 ` Julien Grall
2021-09-09 22:54 ` Stefano Stabellini
2021-09-10 11:53 ` Rahul Singh
2021-09-13 14:52 ` Oleksandr Andrushchenko
2021-09-13 20:23 ` Stefano Stabellini
2021-09-14 4:35 ` Oleksandr Andrushchenko
2021-09-14 7:53 ` Oleksandr Andrushchenko
2021-08-19 12:02 ` [PATCH v1 06/14] xen/arm: Add support for PCI ecam operations Rahul Singh
2021-09-09 11:32 ` Julien Grall
2021-09-14 8:13 ` Rahul Singh
2021-09-09 23:21 ` Stefano Stabellini
2021-09-14 11:13 ` Rahul Singh
2021-09-14 23:06 ` Stefano Stabellini
2021-09-15 16:38 ` Rahul Singh
2021-09-15 20:45 ` Stefano Stabellini
2021-09-16 16:51 ` Rahul Singh
2021-08-19 12:02 ` [PATCH v1 07/14] xen/arm: Add support for Xilinx ZynqMP PCI host controller Rahul Singh
2021-09-09 23:34 ` Stefano Stabellini
2021-09-10 12:01 ` Rahul Singh
2021-09-13 14:46 ` Oleksandr Andrushchenko
2021-09-13 21:02 ` Stefano Stabellini
2021-09-14 4:31 ` Oleksandr Andrushchenko
2021-09-17 7:39 ` Rahul Singh
2021-08-19 12:02 ` [PATCH v1 08/14] xen:arm: Implement pci access functions Rahul Singh
2021-09-09 23:41 ` Stefano Stabellini
2021-09-14 16:05 ` Rahul Singh
2021-09-14 22:40 ` Stefano Stabellini
2021-09-15 7:54 ` Oleksandr Andrushchenko
2021-09-15 10:47 ` Rahul Singh
2021-08-19 12:02 ` [PATCH v1 09/14] xen/arm: Add cmdline boot option "pci=on" Rahul Singh
2021-08-19 12:09 ` Jan Beulich
2021-08-19 12:31 ` Julien Grall
2021-08-20 12:19 ` Rahul Singh
2021-08-20 14:34 ` Julien Grall
2021-08-20 14:37 ` Jan Beulich
2021-09-09 23:46 ` Stefano Stabellini
2021-09-09 23:48 ` Stefano Stabellini
2021-08-19 12:02 ` [PATCH v1 10/14] xen/arm: Discovering PCI devices and add the PCI devices in XEN Rahul Singh
2021-08-19 12:35 ` Julien Grall
2021-08-19 13:40 ` Jan Beulich
2021-08-20 13:05 ` Rahul Singh
2021-08-19 12:02 ` [PATCH v1 11/14] xen/arm: Enable the existing x86 virtual PCI support for ARM Rahul Singh
2021-08-24 16:09 ` Jan Beulich
2021-08-25 5:44 ` Oleksandr Andrushchenko
2021-08-25 6:35 ` Jan Beulich
2021-09-09 13:50 ` Julien Grall
2021-09-16 10:46 ` Rahul Singh
2021-09-10 0:26 ` Stefano Stabellini
2021-09-16 11:01 ` Rahul Singh
2021-09-16 20:26 ` Stefano Stabellini [this message]
2021-09-21 13:49 ` Rahul Singh
2021-09-21 21:38 ` Stefano Stabellini
2021-08-19 12:02 ` [PATCH v1 12/14] arm/libxl: Emulated PCI device tree node in libxl Rahul Singh
2021-08-19 13:00 ` Julien Grall
2021-08-20 16:03 ` Rahul Singh
2021-09-09 13:59 ` Julien Grall
2021-09-16 16:16 ` Rahul Singh
2021-09-10 0:51 ` Stefano Stabellini
2021-09-16 16:35 ` Rahul Singh
2021-08-19 12:02 ` [PATCH v1 13/14] xen/arm: Fixed error when PCI device is assigned to guest Rahul Singh
2021-08-19 12:12 ` Jan Beulich
2021-08-19 12:40 ` Julien Grall
2021-08-20 17:01 ` Rahul Singh
2021-08-19 12:02 ` [PATCH v1 14/14] xen/arm: Add linux,pci-domain property for hwdom if not available Rahul Singh
2021-09-10 1:00 ` Stefano Stabellini
2021-09-16 16:36 ` Rahul Singh
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.DEB.2.21.2109161324200.21985@sstabellini-ThinkPad-T480s \
--to=sstabellini@kernel.org \
--cc=Bertrand.Marquis@arm.com \
--cc=Rahul.Singh@arm.com \
--cc=Volodymyr_Babchuk@epam.com \
--cc=jbeulich@suse.com \
--cc=julien@xen.org \
--cc=paul@xen.org \
--cc=roger.pau@citrix.com \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.