linux-kernel - Re: [Xen-devel] [PATCH v9 10/12] x86/xen: Bypass intr mode setup in enlighten

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Message-ID: <e3bdc29b-1e89-a1d1-487c-a1f31776b746@cn.fujitsu.com>
Date:   Wed, 13 Sep 2017 18:09:24 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     Juergen Gross <jgross@...e.com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <bhe@...hat.com>, <boris.ostrovsky@...cle.com>, <hpa@...or.com>,
        <xen-devel@...ts.xenproject.org>, <tglx@...utronix.de>,
        <yinghai@...nel.org>, <mingo@...nel.org>
Subject: Re: [Xen-devel] [PATCH v9 10/12] x86/xen: Bypass intr mode setup in
 enlighten_pv system

Hi Juergen,

At 09/13/2017 05:45 PM, Juergen Gross wrote:
> On 13/09/17 11:12, 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>.
>
> I asked you to be more specific here before. So: what will be solved?
> Can I select a problem I like? ;-)

Oops, I am sorry I missed it. I will modify it.

...to solve the dump-capture kernel hangs, if there is a notsc option
in its command line.

>
>> 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>]
>
> Rewritten?

Yeah, yeah. poor english skill :-).

>
>> Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
>> Cc: xen-devel@...ts.xenproject.org
>> Cc: boris.ostrovsky@...cle.com
>> Cc: Juergen Gross <jgross@...e.com>
>
> Regarding the changes below:
>
> Acked-by: Juergen Gross <jgross@...e.com>
>

Thank you for your acked, I will re-post it.

Thanks,
	dou.
>
> Juergen
>
>> ---
>>  arch/x86/xen/enlighten_pv.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
>> index ae2a2e2..934dc7f 100644
>> --- a/arch/x86/xen/enlighten_pv.c
>> +++ b/arch/x86/xen/enlighten_pv.c
>> @@ -1232,6 +1232,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
>>  	x86_platform.get_nmi_reason = xen_get_nmi_reason;
>>
>>  	x86_init.resources.memory_setup = xen_memory_setup;
>> +	x86_init.irqs.intr_mode_init	= x86_init_noop;
>>  	x86_init.oem.arch_setup = xen_arch_setup;
>>  	x86_init.oem.banner = xen_banner;
>>
>>
>
>
>
>