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Re: [Xen-devel] [PATCH v2 1/2] xen: introduce VCPUOP_register_runstate_phys_memory_area hypercall
- To: Andrii Anisov <andrii.anisov@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Wed, 8 May 2019 11:10:40 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Andrii Anisov <andrii_anisov@xxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 08 May 2019 10:10:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 4/23/19 9:10 AM, Andrii Anisov wrote:
> From: Andrii Anisov <andrii_anisov@xxxxxxxx>
>
> The hypercall employs the same vcpu_register_runstate_memory_area
> structure for the interface, but requires registered area to not
> cross a page boundary.
This needs a lot more information.
I use the following template when writing changelog entries:
* What's the current situation
* Why is that a problem
* How this patch fixes it
* Any other information needed to understand the patch.
You can drop things when it's obvious, but it's not at all obvious in
this case, at least to me.
This seems to be implementing a VCPUOP which duplicates another VCPUOP's
functionality, with some tweaks. I can back-guess what the differences
are from the description (e.g,. the other one must be a virtual address,
may cross a page boundary, &c), but I can't tell why that's a problem.
Also, I don't see the point of separating the definition from the
implementation -- why not squash these two patches together?
-George
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