linux-kernel - Re: [PATCH] xen/x86: fix PV trap handling on secondary processors

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Message-ID: <0afce6e8-3c8a-e5ae-cd54-0fd598276506@suse.com>
Date:   Fri, 17 Sep 2021 08:40:32 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH] xen/x86: fix PV trap handling on secondary processors

On 17.09.2021 03:34, Boris Ostrovsky wrote:
> 
> On 9/16/21 11:04 AM, Jan Beulich wrote:
>>  {
>>  	const struct desc_ptr *desc = this_cpu_ptr(&idt_desc);
>> +	unsigned i, count = (desc->size + 1) / sizeof(gate_desc);
>>  
>> -	xen_convert_trap_info(desc, traps);
> 
> 
> Can you instead add a boolean parameter to xen_convert_trap_info() to indicate whether to skip empty entries? That will avoid (almost) duplicating the code.

I can, sure, but I specifically didn't, as the result is going to be less
readable imo. Instead I was considering to fold xen_convert_trap_info()
into its only remaining caller. Yet if you're convinced adding the
parameter is the way to do, I will go that route. But please confirm.

Jan