linux-kernel - Re: [PATCH RFC V2 13/17] kmap: Add stray write protection for device pages

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Message-ID: <20200717092139.GC10769@hirez.programming.kicks-ass.net>
Date:   Fri, 17 Jul 2020 11:21:39 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     ira.weiny@...el.com
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH RFC V2 13/17] kmap: Add stray write protection for device
 pages

On Fri, Jul 17, 2020 at 12:20:52AM -0700, ira.weiny@...el.com wrote:
> @@ -31,6 +32,20 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
>  
>  #include <asm/kmap_types.h>
>  
> +static inline void enable_access(struct page *page)
> +{
> +	if (!page_is_access_protected(page))
> +		return;
> +	dev_access_enable();
> +}
> +
> +static inline void disable_access(struct page *page)
> +{
> +	if (!page_is_access_protected(page))
> +		return;
> +	dev_access_disable();
> +}

These are some very generic names, do we want them to be a little more
specific?