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Re: [PATCH v6 3/3] x86/ioreq: Extend ioreq server to support multiple ioreq pages
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 20 Apr 2026 15:38:26 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julian Vetter <julian.vetter@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 20 Apr 2026 13:38:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.04.2026 14:49, Teddy Astie wrote:
> Is there anything that would prevent the use of alloc_domheap_pages() to
> allocate a configuous set of pages at once; and vmap_contig() to map it
> in one go.
> That also prevents the ioreq pages from being scattered around.
>
> We would lose a few pages by aligning the size into a order, but that
> probably better than the alternatives.
>
> That way, we would only have to keep the base gfn (or first page_info)
> and size of the allocation, and don't have to use a array of mfn nor
> have to reverse the vmap to track it.
Well, higher-order allocations can easily fail when there's ample memory
available. Hence why a goal ought to be to avoid such allocations at
runtime. That's why we (now) have vmalloc() and xvmalloc().
Jan
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