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

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Message-ID: <aa086365-fd02-210f-67c6-5c9175c0dfee@suse.com>
Date:   Tue, 1 Aug 2023 10:59:31 +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 10:54, Thomas Gleixner wrote:
> On Tue, Aug 01 2023 at 10:25, Juergen Gross wrote:
>> On 01.08.23 10:23, Thomas Gleixner wrote:
>>> On Tue, Aug 01 2023 at 09:37, Juergen Gross wrote:
>>>> On 01.08.23 09:32, Thomas Gleixner wrote:
>>>>> On Tue, Aug 01 2023 at 09:08, Juergen Gross wrote:
>>>>>> On 01.08.23 08:49, Juergen Gross wrote:
>>>>>>      void __init xen_init_apic(void)
>>>>>>      {
>>>>>>             x86_apic_ops.io_apic_read = xen_io_apic_read;
>>>>>> -       /* On PV guests the APIC CPUID bit is disabled so none of the
>>>>>> -        * routines end up executing. */
>>>>>> -       if (!xen_initial_domain())
>>>>>> -               apic_install_driver(&xen_pv_apic);
>>>>>> -
>>>>>>             x86_platform.apic_post_init = xen_apic_check;
>>>>>
>>>>> I don't think this one is needed.
>>>>
>>>> Indeed.
>>>
>>> Can you send a real patch please which I can add to that pile at the
>>> right place?
>>
>> I think adding it right after patch 50 should be fine?
>>
>> The WARN() will be issued only with patch 58.
> 
> Correct.

Here it is.


Juergen

View attachment "0001-x86-xen-apic-Use-standard-apic-driver-mechanism-for-.patch" of type "text/x-patch" (2347 bytes)

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