linux-kernel - Re: [patch RFC 24/38] x86/xen: Consolidate XEN-MSI init

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Message-ID: <87tuwr68q8.fsf@nanos.tec.linutronix.de>
Date:   Mon, 24 Aug 2020 23:21:19 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jürgen Groß <jgross@...e.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Wei Liu <wei.liu@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Steve Wahl <steve.wahl@....com>,
        Dimitri Sivanich <sivanich@....com>,
        Russ Anderson <rja@....com>, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        xen-devel@...ts.xenproject.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Megha Dey <megha.dey@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Baolu Lu <baolu.lu@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [patch RFC 24/38] x86/xen: Consolidate XEN-MSI init

On Mon, Aug 24 2020 at 06:59, Jürgen Groß wrote:
> On 21.08.20 02:24, Thomas Gleixner wrote:
>> +static __init void xen_setup_pci_msi(void)
>> +{
>> +	if (xen_initial_domain()) {
>> +		x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
>> +		x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
>> +		x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
>> +		pci_msi_ignore_mask = 1;
>
> This is wrong, as a PVH initial domain shouldn't do the pv settings.
>
> The "if (xen_initial_domain())" should be inside the pv case, like:
>
> if (xen_pv_domain()) {
> 	if (xen_initial_domain()) {
> 		...
> 	} else {
> 		...
> 	}
> } else if (xen_hvm_domain()) {
> 	...

I still think it does the right thing depending on the place it is
called from, but even if so, it's completely unreadable gunk. I'll fix
that proper.

Thanks,

        tglx