linux-kernel - Re: [Xen-devel] [PATCH v8 10/13] x86/xen: Bypass intr mode setup in enlighten

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Date:   Mon, 28 Aug 2017 06:32:28 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Dou Liyang <douly.fnst@...fujitsu.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de
Cc:     indou.takao@...fujitsu.com, bhe@...hat.com,
        izumi.taku@...fujitsu.com, rjw@...ysocki.net, bp@...en8.de,
        hpa@...or.com, xen-devel@...ts.xenproject.org,
        boris.ostrovsky@...cle.com, mingo@...nel.org
Subject: Re: [Xen-devel] [PATCH v8 10/13] x86/xen: Bypass intr mode setup in
 enlighten_pv system

On 28/08/17 06:25, Juergen Gross wrote:
> On 28/08/17 05:20, Dou Liyang wrote:
>> XEN PV overrides smp_prepare_cpus(). xen_pv_smp_prepare_cpus()
>> initializes interrupts in the XEN PV specific way and does not invoke
>> native_smp_prepare_cpus(). As a consequence, x86_init.intr_mode_init() is
>> not invoked either.
>>
>> The invocation of x86_init.intr_mode_init() will be moved from
>> native_smp_prepare_cpus() in a follow up patch to solve <INSERT
>> REASON/PROBLEM>.
> 
> Can you be a little bit more precise here, please? :-)
> 
>> That move would cause the invocation of x86_init.intr_mode_init() for XEN
>> PV platforms. To prevent that, override the default x86_init.
>> intr_mode_init() callback with a noop().
>>
>> [Rewrited by Thomas Gleixner <tglx@...utronix.de>]
>>
>> Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
>> Cc: xen-devel@...ts.xenproject.org
>> Cc: boris.ostrovsky@...cle.com
> 
> On which tree does this apply? Would be nice to get a hint against which
> source this can be reviewed.

Aah, just found the rest of the series. In case a single patch of a
series isn't stand alone it would be nice to receive at least the cover
letter of the series in order to know what its all about.


Juergen