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Re: [Qemu-devel] [PATCH v7] spapr: Add support for time base offset migr

From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH v7] spapr: Add support for time base offset migration
Date: Thu, 08 May 2014 14:27:39 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130910 Thunderbird/17.0.9

On 05/06/2014 04:50 PM, Alexey Kardashevskiy wrote:
On 05/01/2014 08:37 PM, Alexey Kardashevskiy wrote:
This allows guests to have a different timebase origin from the host.

This is needed for migration, where a guest can migrate from one host
to another and the two hosts might have a different timebase origin.
However, the timebase seen by the guest must not go backwards, and
should go forwards only by a small amount corresponding to the time
taken for the migration.

This is only supported for recent POWER hardware which has the TBU40
(timebase upper 40 bits) register. That includes POWER6, 7, 8 but not

This adds kvm_access_one_reg() to access a special register which is not
in env->spr. This requires kvm_set_one_reg/kvm_get_one_reg patch.

The feature must be present in the host kernel.

This bumps vmstate_spapr::version_id and enables new vmstate_ppc_timebase
only for it. Since the vmstate_spapr::minimum_version_id remains
unchanged, migration from older QEMU is supported but without

Signed-off-by: Alexey Kardashevskiy <address@hidden>
* migration_duration_ns forced to be between [0...1s]
* s/tb/tb_remote/
* time_of_the_day_ns is int64_t now as this is what get_clock_realtime()
Still bad? :)

The dependency isn't fulfilled yet :)


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