linux-kernel - Re: [PATCH RFC v2 2/4] x86/bus_lock: Handle warn and fatal in #DB for bus lock

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Message-ID: <20201029092747.GI2628@hirez.programming.kicks-ass.net>
Date:   Thu, 29 Oct 2020 10:27:47 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Fenghua Yu <fenghua.yu@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Tony Luck <tony.luck@...el.com>,
        Christopherson Sean J <sean.j.christopherson@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH RFC v2 2/4] x86/bus_lock: Handle warn and fatal in #DB
 for bus lock

On Wed, Oct 28, 2020 at 08:28:02PM +0000, Fenghua Yu wrote:
> diff --git a/arch/x86/include/uapi/asm/debugreg.h b/arch/x86/include/uapi/asm/debugreg.h
> index d95d080b30e3..61078319fc6c 100644
> --- a/arch/x86/include/uapi/asm/debugreg.h
> +++ b/arch/x86/include/uapi/asm/debugreg.h
> @@ -16,7 +16,7 @@
>     are either reserved or not of interest to us. */
>  
>  /* Define reserved bits in DR6 which are always set to 1 */
> -#define DR6_RESERVED	(0xFFFF0FF0)
> +#define DR6_RESERVED	(0xFFFF07F0)

NAK