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Re: [XEN PATCH v1 1/1] x86/domctl: add gva_to_gfn command
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 21 Mar 2023 13:46:23 +0000
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Dmitry Isaykin <isaikin-dmitry@xxxxxxxxx>, Ковалёв Сергей <valor@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21/03/2023 7:28 am, Jan Beulich wrote:
> On 20.03.2023 20:07, Andrew Cooper wrote:
>> On 20/03/2023 4:32 pm, Ковалёв Сергей wrote:
>>> gva_to_gfn command used for fast address translation in LibVMI project.
>>> With such a command it is possible to perform address translation in
>>> single call instead of series of queries to get every page table.
>>>
>>> Thanks to Dmitry Isaykin for involvement.
>>>
>>> Signed-off-by: Sergey Kovalev <valor@xxxxxxx>
>> I fully appreciate why you want this hypercall, and I've said several
>> times that libvmi wants something better than it has, but...
> But is a domctl really the right vehicle? While not strictly intended for
> device models, a dm-op would seem more suitable to me. Considering you
> already brought altp2m into play, it could also be a sub-op of HVMOP_altp2m.
It definitely feels wrong to be using an altp2m op if you're not using
altp2m, and there introspection usecases that don't use altp2m.
dm-op would be the place to put this, if I wasn't pretty sure it would
be modified over time.
As I say - I can see why this might be useful, but pagewalking is more
complicated than the interface presented here.
~Andrew
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