linux-kernel - Re: [PATCH] x86/xen: fix secondary processor fpu initialization

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Message-ID: <58f3bf1b-c5dd-7ac1-e765-7fa7eb0ba51b@suse.com>
Date:   Tue, 4 Jul 2023 07:42:56 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>, xen-devel@...ts.xenproject.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH] x86/xen: fix secondary processor fpu initialization

On 03.07.23 19:51, Boris Ostrovsky wrote:
> 
> 
> On 7/3/23 9:00 AM, Juergen Gross wrote:
>> Moving the call of fpu__init_cpu() from cpu_init() to start_secondary()
>> broke Xen PV guests, as those don't call start_secondary() for APs.
>>
>> Fix that by adding the call of fpu__init_cpu() to cpu_bringup(), which
>> is the Xen PV replacement of start_secondary().
>>
>> Fixes: b81fac906a8f ("x86/fpu: Move FPU initialization into 
>> arch_cpu_finalize_init()")
>> Signed-off-by: Juergen Gross <jgross@...e.com>
> 
> 
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> 

x86 maintainers, could this please go through the tip tree? The patch is
depending on other 6.5 patches which went in via tip.


Juergen

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