linux-kernel - Re: [PATCH -fixes] mm: Add a call to flush_cache_vmap() in vmap

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Date:   Thu, 10 Aug 2023 08:13:56 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     Christoph Hellwig <hch@...radead.org>, dylan@...estech.com
CC:     alexghiti@...osinc.com, akpm@...ux-foundation.org,
        urezki@...il.com, Christoph Hellwig <hch@...radead.org>,
        lstoakes@...il.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject:     Re: [PATCH -fixes] mm: Add a call to flush_cache_vmap() in vmap_pfn()

On Wed, 09 Aug 2023 15:25:19 PDT (-0700), Christoph Hellwig wrote:
> On Wed, Aug 09, 2023 at 06:46:33PM +0200, Alexandre Ghiti wrote:
>> flush_cache_vmap() must be called after new vmalloc mappings are
>> installed in the page table in order to allow architectures to make sure
>> the new mapping is visible.
>
> Looks good.  I somehow vaguely remember seing a patch like this floating
> around before as part of a series, but if that didn't make it it
> certainly should now.
>
> Reviewed-by: Christoph Hellwig <hch@....de>

I think we're likely to end up with performance problems around here, 
but at least it's correct.  If someone has performance

Dylan: this fixes your breakage as well, right?

I've queued it up for testing, but I doubt QEMU would find any issues 
here.  My build box has been slow lately, but it should end up in fixes 
later today.