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Re: [Qemu-devel] [Qemu-ppc] [PATCH 4/4] spapr: Add support for time base
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [Qemu-ppc] [PATCH 4/4] spapr: Add support for time base offset migration |
Date: |
Sat, 12 Apr 2014 01:03:01 +0200 |
> Am 12.04.2014 um 00:59 schrieb Alexander Graf <address@hidden>:
>
>
>
>> Am 11.04.2014 um 23:55 schrieb Benjamin Herrenschmidt <address@hidden>:
>>
>> On Fri, 2014-04-11 at 11:40 +0200, Alexander Graf wrote:
>>>> And G5 uses 33333333. I really do not understand why it is bad to
>>>> send-and-check timer frequency. Why?
>>>
>>> Because the guest will continue to run at a different TB frequency on
>>> the new host and break.
>>
>> Right, which is why we should send it accross so it can be checked and
>> we can barf accordingly rather than having random odd things happen :-)
>
> Would the TB frequency ever be different inside the same generation? We can't
> properly support cross-family migration, so we need to bail out on that
> anyway. No need for an additional check here, no?
Unless we're trying to do PR migration.
Ok, an assert() would make a lot of sense. Or is there a better way to fail
migration?
Alex
>
> Alex
>
>>
>> Ben.
>
- [Qemu-devel] [PATCH 0/4] power7/8 migration patches, Alexey Kardashevskiy, 2014/04/03
- [Qemu-devel] [PATCH 1/4] kvm: Add set_one_reg/get_one_reg helpers, Alexey Kardashevskiy, 2014/04/03
- [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Alexey Kardashevskiy, 2014/04/03
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Alexander Graf, 2014/04/10
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Alexey Kardashevskiy, 2014/04/11
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Alexander Graf, 2014/04/12
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Benjamin Herrenschmidt, 2014/04/12
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Alexander Graf, 2014/04/12
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Benjamin Herrenschmidt, 2014/04/12
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Alexander Graf, 2014/04/14
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Alexey Kardashevskiy, 2014/04/14
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Alexander Graf, 2014/04/14
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Benjamin Herrenschmidt, 2014/04/14
- Re: [Qemu-devel] [PATCH 4/4] spapr: Add support for time base offset migration, Benjamin Herrenschmidt, 2014/04/14