linux-kernel - Re: [patch V2 32/52] x86/fpu/xstate: Sanitize handling of independent features

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Message-ID: <87zgvpezbz.ffs@nanos.tec.linutronix.de>
Date:   Thu, 17 Jun 2021 09:15:44 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Liang\, Kan" <kan.liang@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Borislav Petkov <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [patch V2 32/52] x86/fpu/xstate: Sanitize handling of independent features

On Wed, Jun 16 2021 at 16:04, Kan Liang wrote:
> On 6/14/2021 11:44 AM, Thomas Gleixner wrote:
>>   	intel_pmu_store_lbr(cpuc, xsave->lbr.entries);
>>   }
>
> I tested the LBR Xsave feature on a Alder Lake machine. It looks good.
>
> However, when I did other CPU hotplug test, it gave me an Oops.

Sigh. Yes. I know where this comes from. Brilliant crap that.

Thanks,

        tglx