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Re: [PATCH] pci-host: Allow extended config space access for PowerNV PHB

From: Cédric Le Goater
Subject: Re: [PATCH] pci-host: Allow extended config space access for PowerNV PHB4 model
Date: Wed, 17 Nov 2021 10:04:43 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0

On 11/17/21 08:59, Philippe Mathieu-Daudé wrote:
On 11/9/21 17:04, Cédric Le Goater wrote:
On 11/9/21 16:51, Frederic Barrat wrote:

On 09/11/2021 15:50, Christophe Lombard wrote:
The PCIe extended configuration space on the device is not currently
accessible to the host. if by default,  it is still inaccessible for
conventional for PCIe buses, add the current flag
PCI_BUS_EXTENDED_CONFIG_SPACE on the root bus permits PCI-E extended
config space access.

For the record, this is coming from an experiment of plugging a
CXL device on a QEMU PowerNV POWER10 machine (baremetal). Only
minor changes (64 bits ops) were required to get it working.

Since this note could be helpful when having future retrospective,
do you mind amending this note to the commit description?

Yes. I agree. Please do.
I wonder where we are with the CXL models ?

IIRC Ben worked actively, asked help to the community but received
very few, basically because there is not enough man power IMHO.

Last thing I remember is Igor suggested a different design approach:

Well, the CXL Linux driver seemed to work fine on QEMU machines, Intel
and POWER.

Thanks for the info,


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