linux-kernel - Re: [PATCH] virtio-fs: fix multiple tag support

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Date:   Tue, 19 Mar 2019 16:26:54 -0400
From:   Vivek Goyal <vgoyal@...hat.com>
To:     Liu Bo <bo.liu@...ux.alibaba.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Stefan Hajnoczi <stefanha@...hat.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Miklos Szeredi <miklos@...redi.hu>
Subject: Re: [PATCH] virtio-fs: fix multiple tag support

On Sun, Mar 17, 2019 at 08:35:21AM +0800, Liu Bo wrote:
> While doing memremap from pci_dev's system bus address to kernel virtual
> address, we assign a wrong value to the %end of pgmap.res, which ends up
> with a wrong resource size in the process of memremap, and that further
> prevent the second virtiofs pci device from being probed successfully.
> 
> Signed-off-by: Liu Bo <bo.liu@...ux.alibaba.com>

Hi Liu Bo,

Thanks for the fix. This seems right. I will fix it in my internal
branch. These patches are not upstream yet. Will fold this into
existing patch for the next posting.

Thanks
Vivek

> ---
>  fs/fuse/virtio_fs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
> index 88b00055589b..7abf2187d85f 100644
> --- a/fs/fuse/virtio_fs.c
> +++ b/fs/fuse/virtio_fs.c
> @@ -713,7 +713,7 @@ static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
>  	pgmap->res = (struct resource){
>  		.name = "virtio-fs dax window",
>  		.start = phys_addr,
> -		.end = phys_addr + cache_len,
> +		.end = phys_addr + cache_len - 1,
>  	};
>  
>  	fs->window_kaddr = devm_memremap_pages(&pci_dev->dev, pgmap);
> -- 
> 2.20.1.2.gb21ebb6
>