linux-kernel - Re: [PATCH v2 07/18] x86/resctrl: Move CLOSID/RMID matching and setting to use helpers

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Date:   Thu, 2 Feb 2023 15:47:16 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     James Morse <james.morse@....com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        Babu Moger <Babu.Moger@....com>,
        <shameerali.kolothum.thodi@...wei.com>,
        D Scott Phillips OS <scott@...amperecomputing.com>,
        <carl@...amperecomputing.com>, <lcherian@...vell.com>,
        <bobo.shaobowang@...wei.com>, <tan.shaopeng@...itsu.com>,
        <xingxin.hx@...nanolis.org>, <baolin.wang@...ux.alibaba.com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Xin Hao <xhao@...ux.alibaba.com>, <peternewman@...gle.com>
Subject: Re: [PATCH v2 07/18] x86/resctrl: Move CLOSID/RMID matching and
 setting to use helpers

Hi James,

On 1/13/2023 9:54 AM, James Morse wrote:

...

> @@ -567,19 +579,14 @@ static int __rdtgroup_move_task(struct task_struct *tsk,
>  	 * For monitor groups, can move the tasks only from
>  	 * their parent CTRL group.
>  	 */
> -
> -	if (rdtgrp->type == RDTCTRL_GROUP) {
> -		WRITE_ONCE(tsk->closid, rdtgrp->closid);
> -		WRITE_ONCE(tsk->rmid, rdtgrp->mon.rmid);
> -	} else if (rdtgrp->type == RDTMON_GROUP) {
> -		if (rdtgrp->mon.parent->closid == tsk->closid) {
> -			WRITE_ONCE(tsk->rmid, rdtgrp->mon.rmid);
> -		} else {
> -			rdt_last_cmd_puts("Can't move task to different control group\n");
> -			return -EINVAL;
> -		}
> +	if (rdtgrp->type == RDTMON_GROUP &&
> +	    !resctrl_arch_match_closid(tsk, rdtgrp->mon.parent->closid)) {
> +		rdt_last_cmd_puts("Can't move task to different control group\n");
> +		return -EINVAL;
>  	}
>  
> +	resctrl_arch_set_closid_rmid(tsk, rdtgrp->closid, rdtgrp->mon.rmid);

This does not use the intended closid when rdtgrp->type == RDTMON_GROUP.

Reinette