From: Julien Grall <julien@xen.org>
To: "Roger Pau Monné" <roger.pau@citrix.com>
Cc: Rahul Singh <Rahul.Singh@arm.com>,
Bertrand Marquis <Bertrand.Marquis@arm.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Jan Beulich <jbeulich@suse.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
nd <nd@arm.com>, Julien Grall <julien.grall.oss@gmail.com>
Subject: Re: RFC: PCI devices passthrough on Arm design proposal
Date: Mon, 20 Jul 2020 10:24:52 +0100 [thread overview]
Message-ID: <f28cd954-fecf-e223-e393-24d64a9161f7@xen.org> (raw)
In-Reply-To: <20200720084734.GE7191@Air-de-Roger>
Hi Roger,
On 20/07/2020 09:47, Roger Pau Monné wrote:
> On Fri, Jul 17, 2020 at 05:18:46PM +0100, Julien Grall wrote:
>>> Do you really need to specify the ECAM and MMIO regions there?
>>
>> You need to define those values somewhere :). The layout is only shared
>> between the tools and the hypervisor. I think it would be better if they are
>> defined at the same place as the rest of the layout, so it is easier to
>> rework the layout.
>
> OK, that's certainly a different approach from what x86 uses, where
> the guest memory layout is not defined in the public headers.
It is mostly a convenience as some addresses are used by both the
hypervisor and tools. A guest should use the firmware tables (ACPI/DT)
to detect the MMIO regions.
>
> On x86 my plan would be to add an hypercall that would set the
> position of the ECAM region in the guest physmap, and that would be
> called by the toolstack during domain construction.
It would be possible to use the same on Arm so the hypervisor doesn't
use hardcoded values for the ECAM.
Cheers,
--
Julien Grall
next prev parent reply other threads:[~2020-07-20 9:25 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3F6E40FB-79C5-4AE8-81CA-E16CA37BB298@arm.com>
[not found] ` <BD475825-10F6-4538-8294-931E370A602C@arm.com>
2020-07-16 17:10 ` RFC: PCI devices passthrough on Arm design proposal Rahul Singh
2020-07-16 20:51 ` Stefano Stabellini
2020-07-17 6:53 ` Bertrand Marquis
2020-07-17 7:41 ` Oleksandr Andrushchenko
2020-07-17 11:26 ` Julien Grall
2020-07-17 11:41 ` Oleksandr Andrushchenko
2020-07-17 13:21 ` Bertrand Marquis
2020-07-17 12:46 ` Rahul Singh
2020-07-17 12:55 ` Jan Beulich
2020-07-17 13:12 ` Bertrand Marquis
2020-07-17 8:10 ` Jan Beulich
2020-07-17 8:47 ` Oleksandr Andrushchenko
2020-07-17 13:28 ` Rahul Singh
2020-07-17 13:14 ` Bertrand Marquis
2020-07-17 13:19 ` Jan Beulich
2020-07-17 13:59 ` Bertrand Marquis
2020-07-17 14:06 ` Jan Beulich
2020-07-17 14:34 ` Bertrand Marquis
2020-07-17 14:41 ` Roger Pau Monné
2020-07-17 14:49 ` Bertrand Marquis
2020-07-17 15:05 ` Roger Pau Monné
2020-07-17 15:23 ` Bertrand Marquis
2020-07-17 15:30 ` Roger Pau Monné
2020-07-17 15:51 ` Bertrand Marquis
2020-07-17 16:08 ` Roger Pau Monné
2020-07-17 16:18 ` Julien Grall
2020-07-17 19:17 ` Oleksandr
2020-07-18 9:58 ` Bertrand Marquis
2020-07-18 11:24 ` Julien Grall
2020-07-20 11:27 ` Oleksandr
2020-07-20 8:47 ` Roger Pau Monné
2020-07-20 9:24 ` Julien Grall [this message]
2020-07-20 23:23 ` Stefano Stabellini
2020-07-21 9:54 ` Rahul Singh
2020-07-17 11:16 ` Roger Pau Monné
2020-07-17 13:22 ` Bertrand Marquis
2020-07-17 13:29 ` Julien Grall
2020-07-17 13:44 ` Bertrand Marquis
2020-07-17 13:49 ` Julien Grall
2020-07-17 14:01 ` Bertrand Marquis
2020-07-17 14:31 ` Roger Pau Monné
2020-07-17 15:21 ` Bertrand Marquis
2020-07-17 15:55 ` Roger Pau Monné
2020-07-18 9:49 ` Bertrand Marquis
2020-07-20 8:45 ` Roger Pau Monné
2020-07-20 23:24 ` Stefano Stabellini
2020-07-21 1:39 ` Rob Herring
2020-07-21 19:35 ` Stefano Stabellini
[not found] ` <8ac91a1b-e6b3-0f2b-0f23-d7aff100936d@xen.org>
2020-07-17 13:50 ` Julien Grall
2020-07-17 13:59 ` Jan Beulich
2020-07-17 14:12 ` Julien Grall
2020-07-17 14:23 ` Jan Beulich
2020-07-17 14:47 ` Bertrand Marquis
2020-07-17 15:26 ` Julien Grall
2020-07-17 15:47 ` Bertrand Marquis
2020-07-17 16:05 ` Roger Pau Monné
2020-07-18 9:55 ` Bertrand Marquis
2020-07-18 11:14 ` Julien Grall
2020-07-20 11:32 ` Rahul Singh
2020-07-18 11:32 ` Julien Grall
2020-07-18 11:08 ` Julien Grall
2020-07-20 11:26 ` Rahul Singh
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