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SubjectRe: [PATCH] vhost: correctly set bits of dirty pages
Michael S. Tsirkin writes:
> On Mon, Nov 29, 2010 at 01:48:20PM +0800, Jason Wang wrote:
> > When counting pages we should increase it by 1 instead of VHOST_PAGE_SIZE,
> > and also make log_write() can correctly process the request across
> > pages with write_address not start at page boundary.
> >
> > Signed-off-by: Jason Wang <jasowang@redhat.com>
>
> dd
> Thanks, good catch!
> But let's to it in small steps: first, a small patch to fix the bug:
> I think this is equivalent, right?
>

Yes.

> Subject: vhost: correctly set bits of dirty pages
>
> When counting pages we should increase address by 1 instead of
> VHOST_PAGE_SIZE, and also make log_write() can correctly process the
> request across pages with write_address not starting at page boundary.
>
> Reported-by: Jason Wang <jasowang@redhat.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
>

I'm fine with this, thanks!

> ---
>
> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> index 568eb70..d0a3552 100644
> --- a/drivers/vhost/vhost.c
> +++ b/drivers/vhost/vhost.c
> @@ -887,6 +887,7 @@ static int log_write(void __user *log_base,
> int r;
> if (!write_length)
> return 0;
> + write_length += write_address % VHOST_PAGE_SIZE;
> write_address /= VHOST_PAGE_SIZE;
> for (;;) {
> u64 base = (u64)(unsigned long)log_base;
> @@ -900,7 +901,7 @@ static int log_write(void __user *log_base,
> if (write_length <= VHOST_PAGE_SIZE)
> break;
> write_length -= VHOST_PAGE_SIZE;
> - write_address += VHOST_PAGE_SIZE;
> + write_address += 1;
> }
> return r;
> }
> --
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