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Re: [Qemu-devel] [PATCH 1/1] block: align bounce buffers to page
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH 1/1] block: align bounce buffers to page |
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Date: |
Mon, 02 Feb 2015 17:47:49 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 |
On 02/02/2015 17:44, Denis V. Lunev wrote:
> +++ b/block/raw-posix.c
> @@ -667,7 +667,8 @@ static void raw_refresh_limits(BlockDriverState *bs,
> Error **errp)
> BDRVRawState *s = bs->opaque;
>
> raw_probe_alignment(bs, s->fd, errp);
> - bs->bl.opt_mem_alignment = s->buf_align;
> + bs->bl.min_mem_alignment = s->buf_align;
> + bs->bl.opt_mem_alignment = MAX(sysconf(_SC_PAGESIZE), s->buf_align);
This does not exist on Windows. You have to use getpagesize(), for
which there is a wrapper in util/oslib-win32.c.
Paolo
> raw_probe_max_write_zeroes(bs);