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From: Laszlo Ersek <lersek@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,
	Zihan Yang <whois.zihan.yang@gmail.com>,
	qemu-devel@nongnu.org, Igor Mammedov <imammedo@redhat.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Eric Auger <eauger@redhat.com>, Drew Jones <drjones@redhat.com>,
	Wei Huang <wei@redhat.com>
Subject: Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges
Date: Wed, 23 May 2018 09:32:09 +0200	[thread overview]
Message-ID: <e027866e-9740-0866-f1c4-45b8181a6f71@redhat.com> (raw)
In-Reply-To: <20180523023944-mutt-send-email-mst@kernel.org>

On 05/23/18 01:40, Michael S. Tsirkin wrote:
> On Wed, May 23, 2018 at 12:42:09AM +0200, Laszlo Ersek wrote:
>> Hold on,
>>
>> On 05/22/18 21:51, Laszlo Ersek wrote:
>>
>>> It had taken years until the edk2 core gained a universal
>>> PciHostBridgeDxe driver with a well-defined platform customization
>>> interface, and that interface doesn't support multiple domains /
>>> segments.
>>
>> after doing a bit more research: I was wrong about this. What I
>> remembered was not the current state. Edk2 does seem to support multiple
>> domains, with different segment numbers, ECAM base addresses, and bus
>> number ranges. If we figure out a placement strategy or an easy to
>> consume representation of these data for the firmware, it might be
>> possible for OVMF to hook them into the edk2 core (although not in the
>> earliest firmware phases, such as SEC and PEI).
>>
>> In retrospect, I'm honestly surprised that so much multi-segment support
>> has been upstreamed to the edk2 core. Sorry about the FUD. (My general
>> points remain valid, for the record... But perhaps they no longer matter
>> for this discussion.)
>>
>> (I meant to send this message soon after
>> <http://mid.mail-archive.com/fc603491-7c41-e862-a583-2bae6f165b5a@redhat.com>,
>> but my internet connection had to die right then.)
>>
>> Thanks
>> Laszlo
> 
> Is there support for any hardware which we could emulate?

I don't see any actual hw support in the edk2 project, but I'll ask.

Thanks
Laszlo

  reply	other threads:[~2018-05-23  7:32 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-20  7:28 [Qemu-devel] [RFC 0/3] pci_expander_brdige: Put pxb host bridge into separate pci domain Zihan Yang
2018-05-20  7:28 ` [Qemu-devel] [RFC 1/3] pci_expander_bridge: reserve enough mcfg space for pxb host Zihan Yang
2018-05-21 11:03   ` Marcel Apfelbaum
2018-05-22  5:59     ` Zihan Yang
2018-05-22 18:47       ` Marcel Apfelbaum
2018-05-20  7:28 ` [Qemu-devel] [RFC 2/3] pci: Link pci_host_bridges with QTAILQ Zihan Yang
2018-05-21 11:05   ` Marcel Apfelbaum
2018-05-22  5:59     ` Zihan Yang
2018-05-22 18:39       ` Marcel Apfelbaum
2018-05-20  7:28 ` [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges Zihan Yang
2018-05-21 11:53   ` Marcel Apfelbaum
2018-05-22  6:03     ` Zihan Yang
2018-05-22 18:43       ` Marcel Apfelbaum
2018-05-22  9:52     ` Laszlo Ersek
2018-05-22 19:01       ` Marcel Apfelbaum
2018-05-22 19:51         ` Laszlo Ersek
2018-05-22 20:58           ` Michael S. Tsirkin
2018-05-22 21:36             ` Alex Williamson
2018-05-22 21:44               ` Michael S. Tsirkin
2018-05-22 21:47                 ` Alex Williamson
2018-05-22 22:00                   ` Laszlo Ersek
2018-05-22 23:38                   ` Michael S. Tsirkin
2018-05-23  4:28                     ` Alex Williamson
2018-05-23 14:25                       ` Michael S. Tsirkin
2018-05-23 14:57                         ` Alex Williamson
2018-05-23 15:01                           ` Michael S. Tsirkin
2018-05-23 16:50                         ` Marcel Apfelbaum
2018-05-22 21:17           ` Alex Williamson
2018-05-22 21:22             ` Michael S. Tsirkin
2018-05-22 21:58               ` Laszlo Ersek
2018-05-22 21:50             ` Laszlo Ersek
2018-05-23 17:00             ` Marcel Apfelbaum
2018-05-22 22:42           ` Laszlo Ersek
2018-05-22 23:40             ` Michael S. Tsirkin
2018-05-23  7:32               ` Laszlo Ersek [this message]
2018-05-23 11:11                 ` Zihan Yang
2018-05-23 12:28                   ` Laszlo Ersek
2018-05-23 17:23                     ` Marcel Apfelbaum
2018-05-24  9:57                     ` Zihan Yang
2018-05-23 17:33                   ` Marcel Apfelbaum
2018-05-24 10:00                     ` Zihan Yang
2018-05-23 17:11                 ` Marcel Apfelbaum
2018-05-23 17:25                   ` Laszlo Ersek
2018-05-28 11:02                 ` Laszlo Ersek
2018-05-21 15:23 ` [Qemu-devel] [RFC 0/3] pci_expander_brdige: Put pxb host bridge into separate pci domain Marcel Apfelbaum
2018-05-22  6:04   ` Zihan Yang

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