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Re: [Qemu-devel] [PATCH v12 2/6] migration: add postcopy blocktime ctx i

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH v12 2/6] migration: add postcopy blocktime ctx into MigrationIncomingState
Date: Tue, 2 Jan 2018 15:22:28 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0

On 10/30/2017 08:16 AM, Alexey Perevalov wrote:
> This patch adds request to kernel space for UFFD_FEATURE_THREAD_ID,
> in case when this feature is provided by kernel.

Either 'in the case when this feature' or 'in case this feature'.

> PostcopyBlocktimeContext is incapsulated inside postcopy-ram.c,


> due to it's postcopy only feature.

s/it's postcopy only/it being a postcopy-only/

> Also it defines PostcopyBlocktimeContext's instance live time.
> Information from PostcopyBlocktimeContext instance will be provided
> much after postcopy migration end, instance of PostcopyBlocktimeContext
> will live till QEMU exit, but part of it (vcpu_addr,
> page_fault_vcpu_time) used only during calculation, will be released
> when postcopy ended or failed.
> To enable postcopy blocktime calculation on destination, need to request
> proper capabiltiy (Patch for documentation will be at the tail of the patch


> set).
> As an example following command enable that capability, assume QEMU was
> started with
> -chardev socket,id=charmonitor,path=/var/lib/migrate-vm-monitor.sock
> option to control it
> address@hidden "{\"execute\" : \"qmp_capabilities\"}\r\n \
> {\"execute\": \"migrate-set-capabilities\" , \"arguments\":   {
> \"capabilities\": [ { \"capability\": \"postcopy-blocktime\", \"state\":
> true } ] } }" | nc -U /var/lib/migrate-vm-monitor.sock
> Or just with HMP
> (qemu) migrate_set_capability postcopy-blocktime on
> Reviewed-by: Dr. David Alan Gilbert <address@hidden>
> Signed-off-by: Alexey Perevalov <address@hidden>
> ---
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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