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Re: [Xen-devel] [PATCH] libxc/migration: Drop unimplemneted domain types
- To: Ian Jackson <ian.jackson@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 20 Dec 2019 18:30:48 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 20 Dec 2019 18:31:09 +0000
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On 20/12/2019 18:24, Ian Jackson wrote:
> Andrew Cooper writes ("[PATCH] libxc/migration: Drop unimplemneted domain
> types"):
>> x86 PVH is completely obsolete - it was intended for legacy PVH before that
>> idea was abandoned. There was an RFC series for ARM in 2015, but there is
>> plenty of outstanding work which hasn't been done yet.
>>
>> No functional change. New types can be (re)introduced with the code which
>> actually implements them.
> ...
>> - 0x0003: x86 PVH.
>> -
>> - 0x0004: ARM.
>> -
>> - 0x0005 - 0xFFFFFFFF: Reserved.
>> + 0x0003 - 0xFFFFFFFF: Reserved.
> This is reclaiming those numbers.
Yes
> Could there be any software which uses them ?
Not plausibly, no, given...
> Eg, maybe someone put the RFC series into production ?
... the rather large set of outstanding TODO items in IanC's RFC series,
which included "the hypervisor is unstable when logdirty gets enabled" IIRC.
~Andrew
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