From: "Gerd Hoffmann" <kraxel@redhat.com>
To: devel@edk2.groups.io, kallol.biswas@nutanix.com
Cc: Pritam Chatterjee <pritam.chatterjee@nutanix.com>,
Jiewen Yao <jiewen.yao@intel.com>,
Ard Biesheuvel <ardb@kernel.org>
Subject: Re: [edk2-devel] uefi VM and IO window overlap issue
Date: Tue, 20 Jun 2023 16:24:10 +0200 [thread overview]
Message-ID: <wpynq26qe4igexzd7embcdgnz5g2e72vkwlpdipwfzmpi36i7o@ie4wxejgwvkd> (raw)
In-Reply-To: <BL3PR02MB7986C82BAE8AB1A00CAC1067FE54A@BL3PR02MB7986.namprd02.prod.outlook.com>
On Mon, Jun 12, 2023 at 07:27:37PM +0000, Kallol Biswas [C] wrote:
> Hi,
> We have been observing an issue that IO BARs can't be claimed due to resource
> conflict.
>
> [ 0.457693] pci 0000:00:1d.0: can't claim BAR 4 [io 0x92a0-0x92bf]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]
> [ 0.457705] pci 0000:00:1d.1: can't claim BAR 4 [io 0x9280-0x929f]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]
> [ 0.457715] pci 0000:00:1d.2: can't claim BAR 4 [io 0x9260-0x927f]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]
> [ 0.457743] pci 0000:00:1f.2: can't claim BAR 4 [io 0x9240-0x925f]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]
> [ 0.457754] pci 0000:00:1f.3: can't claim BAR 4 [io 0x9200-0x923f]: address conflict with PCI Bus 0000:01 [io 0x9000-0x9fff]
>
>
> Please see the discussion thread:
>
> https://www.spinics.net/lists/linux-pci/msg133740.html
>
> The root of the problem is that OVMF does not take into account the limit register's granularity (limit) of a bridge,
> and programs EPs with overlapping IO ranges in a different bus.
>
> Should we fix the issue in the OVMF?
IMHO yes.
https://edk2.groups.io/g/devel/message/96645
Jiewen suggested to fix it somewhere in PCI code instead.
No response from the PCI maintainers on that comment.
Jiewen, Ard?
How move forward with that?
take care,
Gerd
next prev parent reply other threads:[~2023-06-20 14:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-12 19:27 uefi VM and IO window overlap issue Kallol Biswas [C]
2023-06-20 14:24 ` Gerd Hoffmann [this message]
2023-06-26 9:52 ` [edk2-devel] " Ard Biesheuvel
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