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From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Rahul Singh <rahul.singh@arm.com>
Cc: <xen-devel@lists.xenproject.org>, <bertrand.marquis@arm.com>,
	Jan Beulich <jbeulich@suse.com>, Paul Durrant <paul@xen.org>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	George Dunlap <george.dunlap@citrix.com>,
	Ian Jackson <iwj@xenproject.org>, Julien Grall <julien@xen.org>,
	Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
	Daniel De Graaf <dgdegra@tycho.nsa.gov>
Subject: Re: [PATCH 2/2] xen/pci: Gate all MSI code in common code with CONFIG_HAS_PCI_MSI
Date: Tue, 6 Apr 2021 16:13:17 +0200	[thread overview]
Message-ID: <YGxsfdK9GEefLgAv@Air-de-Roger> (raw)
In-Reply-To: <4471ba4fffc8a0cef24cc11314fc788334f85ccc.1617702520.git.rahul.singh@arm.com>

On Tue, Apr 06, 2021 at 12:39:11PM +0100, Rahul Singh wrote:
> MSI support is not implemented for ARM architecture but it is enabled
> for x86 architecture and referenced in common passthrough/pci.c code.
> 
> Therefore introducing the new flag to gate the MSI code for ARM in
> common code to avoid compilation error when HAS_PCI is enabled for ARM.

Is such option really interesting long term?

IIRC PCI Express mandates MSI support, at which point I don't see much
value in being able to compile out the MSI support.

So while maybe helpful for Arm PCI efforts ATM, I'm not sure it
warrants a Kconfig option, I would rather see Arm introduce dummy
helpers for the missing functionality, even if unimplemented at the
moment.

Thanks, Roger.


  reply	other threads:[~2021-04-06 14:14 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-06 11:39 [PATCH 0/2] xen/pci: Make PCI passthrough code non-x86 specific Rahul Singh
2021-04-06 11:39 ` [PATCH 1/2] xen/pci: Move PCI ATS code to common directory Rahul Singh
2021-04-06 15:16   ` Jan Beulich
2021-04-06 11:39 ` [PATCH 2/2] xen/pci: Gate all MSI code in common code with CONFIG_HAS_PCI_MSI Rahul Singh
2021-04-06 14:13   ` Roger Pau Monné [this message]
2021-04-06 14:30     ` Julien Grall
2021-04-06 14:59       ` Roger Pau Monné
2021-04-06 15:09         ` Julien Grall
2021-04-06 15:58           ` Roger Pau Monné
2021-04-07 17:52             ` Rahul Singh
2021-04-06 15:25       ` Jan Beulich
2021-04-07 18:06         ` Julien Grall
2021-04-08  6:00           ` Jan Beulich
2021-04-08  8:45             ` Rahul Singh

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