linux-kernel - Re: [patch V2 50/58] x86/apic: Provide common init infrastructure

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Message-ID: <807ac0ad-b2c4-4a10-a82c-6d95649ae4dc@suse.com>
Date:   Tue, 1 Aug 2023 08:49:26 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Andrew Cooper <andrew.cooper3@...rix.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wei Liu <wei.liu@...nel.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Peter Keresztes Schmidt <peter@...esztesschmidt.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: Re: [patch V2 50/58] x86/apic: Provide common init infrastructure

On 01.08.23 08:41, Thomas Gleixner wrote:
> On Mon, Jul 31 2023 at 17:48, Thomas Gleixner wrote:
> 
>> On Mon, Jul 31 2023 at 15:10, Juergen Gross wrote:
>>> On 31.07.23 15:01, Thomas Gleixner wrote:
>>>>>     apic_driver(xen_pv_apic);
>>>>
>>>> I wonder whether this explicit install is actually needed at all.
>>>> Shouldn't the driver be installed via the APIC probing mechanism
>>>> automagically?
>>>
>>> Only in case x86_init.irq.intr_mode_init is set appropriately. Today it is
>>> a nop for Xen PV, but that can be changed. I'll have a look.
>>
>> You could simply set that callback to default_setup_apic_routing() and
>> be done with it.
> 
> Doesn't work because XEN overrides it already. So sure, lets just go

It is overriding it with x86_init_noop().

> with the solution you proposed. One more ugly or less in XEN/PV does not
> really matter much :)
> 
> Let me grab this and put it into the right position in the queue.

Wait a few minutes, please. I'm just about to test your suggestion.


Juergen


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