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Re: [PATCH v3 06/11] vpci/header: Handle p2m range sets per BAR
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 2 Nov 2021 12:13:32 +0100
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- Cc: "julien@xxxxxxx" <julien@xxxxxxx>, "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Artem Mygaiev <Artem_Mygaiev@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Rahul Singh <rahul.singh@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
- Delivery-date: Tue, 02 Nov 2021 11:13:47 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.10.2021 11:40, Roger Pau Monné wrote:
> On Mon, Oct 25, 2021 at 11:51:57AM +0000, Oleksandr Andrushchenko wrote:
>> Hi, Roger!
>> Could you please take a look at the below?
>> Jan was questioning the per BAR range set approach, so it
>> is crucial for the maintainer (you) to answer here.
>
> I'm open to suggestions to using something different than a rangeset
> per BAR, but lacking any concrete proposal I think using rangesets is
> fine.
The main reason for my objection is that for the average BAR the
rangeset will hold exactly one range. That's not an efficient way
to express a single range.
> One possible way might be to extend rangesets so that private data
> could be stored for each rangeset range, but that would then make
> merging operations impossible, likewise splitting ranges would be
> troublesome.
Indeed, so I don't view this as an option.
Jan
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