From: Alexey G <x1917x@gmail.com>
To: Jan Beulich <jbeulich@suse.com>, Juergen Gross <jgross@suse.com>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>,
xen-devel@lists.xenproject.org,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Anthony PERARD" <anthony.perard@vates.tech>,
"Michal Orzel" <michal.orzel@amd.com>,
"Julien Grall" <julien@xen.org>,
"Stefano Stabellini" <sstabellini@kernel.org>,
"Thierry Escande" <thierry.escande@vates.tech>
Subject: Re: [PATCH 00/17] Q35 initial support for HVM guests
Date: Tue, 5 May 2026 15:29:12 +0200 [thread overview]
Message-ID: <20260505152912.6b73c551@LinuxLaptop> (raw)
In-Reply-To: <99756799-27be-45ae-99be-eae5b0c41a11@suse.com>
On Mon, 4 May 2026 12:45:23 +0200
Jan Beulich <jbeulich@suse.com> wrote:
>> Why do you need multi bus support to expose PCIe capabilities? I'm
>> not seeing the relation between those two. You could still expose a
>> single bus on the MCFG table.
>
>Can a valid PCIe topology be expressed with just bus 0? If an endpoint
>to be handed to a guest isn't root complex integrated, would it be
>valid to make it appear so by putting it on bus 0?
No, unfortunately, it will fail at least under Windows' pci.sys
driver. Unless they changed something in the past years. To place an
endpoint device to bus 0, we need to emulate that it's a
chipset-integrated device by trapping its PCIe Capabilities reads.
I found an old pci.sys + .pdb symbols which I used for debugging back
in 2017 and, if I remember correctly, the failing function was
`ExpressValidateFabricTopology()`.
next prev parent reply other threads:[~2026-05-05 13:29 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-13 16:35 [PATCH 00/17] Q35 initial support for HVM guests Thierry Escande
2026-03-13 16:35 ` [PATCH 01/17] libacpi: Split dsdt.asl file and extract i440 specific parts Thierry Escande
2026-04-28 9:05 ` Roger Pau Monné
2026-05-04 14:34 ` Jan Beulich
2026-05-04 14:35 ` Jan Beulich
2026-03-13 16:35 ` [PATCH 06/17] hvmloader: Move pci devices setup to a separate function Thierry Escande
2026-04-28 12:48 ` Roger Pau Monné
2026-05-04 14:52 ` Jan Beulich
2026-03-13 16:35 ` [PATCH 03/17] hvmloader: add function to set the emulated machine type (i440/Q35) Thierry Escande
2026-04-28 10:39 ` Roger Pau Monné
2026-05-04 10:58 ` Jan Beulich
2026-05-04 14:43 ` Jan Beulich
2026-03-13 16:35 ` [PATCH 02/17] libacpi: new DSDT ACPI table for Q35 Thierry Escande
2026-04-28 10:17 ` Roger Pau Monné
2026-05-04 14:39 ` Jan Beulich
2026-03-13 16:35 ` [PATCH 05/17] hvmloader: add Q35 DSDT table loading Thierry Escande
2026-04-28 11:08 ` Roger Pau Monné
2026-03-13 16:35 ` [PATCH 08/17] hvmloader: Extend PCI BAR struct Thierry Escande
2026-04-28 13:31 ` Roger Pau Monné
2026-05-04 15:01 ` Jan Beulich
2026-03-13 16:35 ` [PATCH 10/17] hvmloader: Add support for HVMOP_set|get_ecam_space hypercalls Thierry Escande
2026-04-28 14:14 ` Roger Pau Monné
2026-03-13 16:35 ` [PATCH 07/17] hvmloader: add basic Q35 support Thierry Escande
2026-04-28 13:15 ` Roger Pau Monné
2026-05-10 23:32 ` Alexey G
2026-05-04 14:55 ` Jan Beulich
2026-03-13 16:35 ` [PATCH 14/17] libacpi: build ACPI MCFG table if requested Thierry Escande
2026-04-29 10:13 ` Roger Pau Monné
2026-03-13 16:35 ` [PATCH 09/17] xev/hvm: Add HVMOP_get|set_ecam_space hypercalls Thierry Escande
2026-04-28 13:59 ` Roger Pau Monné
2026-05-04 11:09 ` Jan Beulich
2026-05-04 15:12 ` Jan Beulich
2026-03-13 16:35 ` [PATCH 11/17] hvmloader: allocate MMCONFIG area in the MMIO hole Thierry Escande
2026-04-29 9:29 ` Roger Pau Monné
2026-05-04 11:11 ` Jan Beulich
2026-05-04 12:23 ` Roger Pau Monné
2026-05-04 12:36 ` Jan Beulich
2026-03-13 16:35 ` [PATCH 12/17] libxl: Q35 support (new option device_model_machine) Thierry Escande
2026-04-29 10:01 ` Roger Pau Monné
2026-03-13 16:35 ` [PATCH 13/17] libxl: Add xen-platform device for Q35 machine Thierry Escande
2026-03-13 16:35 ` [PATCH 15/17] hvmloader: Set MCFG in ACPI table Thierry Escande
2026-04-29 12:33 ` Roger Pau Monné
2026-03-13 16:35 ` [PATCH 04/17] hvmloader: add ACPI enabling for Q35 Thierry Escande
2026-04-28 10:48 ` Roger Pau Monné
2026-05-05 13:58 ` Alexey G
2026-05-05 14:25 ` Roger Pau Monné
2026-03-13 16:35 ` [PATCH 16/17] Handle PCIe ECAM space access from guests Thierry Escande
2026-04-29 12:42 ` Roger Pau Monné
2026-05-04 15:22 ` Jan Beulich
2026-03-13 16:35 ` [PATCH 17/17] docs: provide description for device_model_machine option Thierry Escande
2026-04-29 12:43 ` Roger Pau Monné
2026-03-15 22:43 ` [PATCH 00/17] Q35 initial support for HVM guests Alexey G
2026-04-28 7:48 ` Roger Pau Monné
2026-05-04 10:45 ` Jan Beulich
2026-05-05 5:48 ` Jan Beulich
2026-05-05 5:49 ` Jan Beulich
2026-05-05 13:29 ` Alexey G [this message]
2026-05-05 13:07 ` Alexey G
2026-05-05 14:15 ` Roger Pau Monné
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=20260505152912.6b73c551@LinuxLaptop \
--to=x1917x@gmail.com \
--cc=andrew.cooper3@citrix.com \
--cc=anthony.perard@vates.tech \
--cc=jbeulich@suse.com \
--cc=jgross@suse.com \
--cc=julien@xen.org \
--cc=michal.orzel@amd.com \
--cc=roger.pau@citrix.com \
--cc=sstabellini@kernel.org \
--cc=thierry.escande@vates.tech \
--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.