linux-kernel - Re: [PATCH] dma-remap: Align the size in dma_common_*

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Date:   Tue, 23 Jun 2020 13:40:53 +0200
From:   Christoph Hellwig <hch@....de>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     eric.auger.pro@...il.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, peterz@...radead.org,
        akpm@...ux-foundation.org, jean-philippe@...aro.org,
        bbhushan2@...vell.com
Subject: Re: [PATCH] dma-remap: Align the size in dma_common_*_remap()

On Mon, Jun 22, 2020 at 10:23:20PM +0200, Eric Auger wrote:
> Running a guest with a virtio-iommu protecting virtio devices
> is broken since commit 515e5b6d90d4 ("dma-mapping: use vmap insted
> of reimplementing it"). Before the conversion, the size was
> page aligned in __get_vm_area_node(). Doing so fixes the
> regression.
> 
> Fixes: 515e5b6d90d4 ("dma-mapping: use vmap insted of reimplementing it")
> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> ---
>  kernel/dma/remap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/dma/remap.c b/kernel/dma/remap.c
> index e739a6eea6e7..a3151a9b0c08 100644
> --- a/kernel/dma/remap.c
> +++ b/kernel/dma/remap.c
> @@ -24,7 +24,7 @@ void *dma_common_pages_remap(struct page **pages, size_t size,
>  {
>  	void *vaddr;
>  
> -	vaddr = vmap(pages, size >> PAGE_SHIFT, VM_DMA_COHERENT, prot);
> +	vaddr = vmap(pages, PAGE_ALIGN(size) >> PAGE_SHIFT, VM_DMA_COHERENT, prot);

Please respin without going over 80 characters.