linux-kernel - Re: [RESEND PATCH v5 3/6] arm64: Add tlbi_user

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Message-ID: <20200710085326.GA11839@gaia>
Date:   Fri, 10 Jul 2020 09:53:27 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Zhenyu Ye <yezhenyu2@...wei.com>
Cc:     peterz@...radead.org, mark.rutland@....com, will@...nel.org,
        aneesh.kumar@...ux.ibm.com, akpm@...ux-foundation.org,
        npiggin@...il.com, arnd@...db.de, rostedt@...dmis.org,
        maz@...nel.org, suzuki.poulose@....com, tglx@...utronix.de,
        yuzhao@...gle.com, Dave.Martin@....com, steven.price@....com,
        broonie@...nel.org, guohanjun@...wei.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org, arm@...nel.org,
        xiexiangyou@...wei.com, prime.zeng@...ilicon.com,
        zhangshaokun@...ilicon.com, kuhn.chenqun@...wei.com
Subject: Re: [RESEND PATCH v5 3/6] arm64: Add tlbi_user_level TLB
 invalidation helper

On Fri, Jul 10, 2020 at 09:20:59AM +0800, Zhenyu Ye wrote:
> On 2020/7/10 0:48, Catalin Marinas wrote:
> > On Thu, Jun 25, 2020 at 04:03:11PM +0800, Zhenyu Ye wrote:
> >> @@ -189,8 +195,9 @@ static inline void flush_tlb_page_nosync(struct vm_area_struct *vma,
> >>  	unsigned long addr = __TLBI_VADDR(uaddr, ASID(vma->vm_mm));
> >>  
> >>  	dsb(ishst);
> >> -	__tlbi(vale1is, addr);
> >> -	__tlbi_user(vale1is, addr);
> >> +	/* This function is only called on a small page */
> >> +	__tlbi_level(vale1is, addr, 3);
> >> +	__tlbi_user_level(vale1is, addr, 3);
> >>  }
> > 
> > Actually, that's incorrect. It was ok in v2 of your patches when I
> > suggested to drop level 0, just leave the function unchanged but I
> > missed that you updated it to pass level 3.
> > 
> > pmdp_set_access_flags -> ptep_set_access_flags ->
> > flush_tlb_fix_spurious_fault -> flush_tlb_page -> flush_tlb_page_nosync.
> 
> How do you want to fix this error? I notice that this series have been applied
> to arm64 (for-next/tlbi).  Should I send a new series based on arm64 (for-next/tlbi)?

Just a patch on top with a Fixes: tag.

Thanks.

-- 
Catalin