* [PATCH] docs: Specify VCPU hotplug procedure for HVMlite guests
@ 2016-02-03 16:11 Boris Ostrovsky
2016-02-03 16:20 ` Wei Liu
0 siblings, 1 reply; 2+ messages in thread
From: Boris Ostrovsky @ 2016-02-03 16:11 UTC (permalink / raw)
To: ian.campbell, ian.jackson, jbeulich, keir, tim
Cc: Boris Ostrovsky, roger.pau, wei.liu2, xen-devel
HVMlite VCPUs can be added and removed by toggling 'availability'
value of VCPU's xenstore entry.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
I am not sure this is really needed since it's no different from how we
do hotplug for PV or HVM/qemu-trad guests.
I may have been a bit too grandiose by describing yesterday's patch as
"add CPU hotplug support". It was really enabling existing functionality.
docs/misc/hvmlite.markdown | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/docs/misc/hvmlite.markdown b/docs/misc/hvmlite.markdown
index c1b75c6..1a2e866 100644
--- a/docs/misc/hvmlite.markdown
+++ b/docs/misc/hvmlite.markdown
@@ -80,3 +80,8 @@ are used in order to bring up secondary vCPUs:
* `VCPUOP_down` is used to bring down a vCPU.
* `VCPUOP_is_up` is used to scan the number of available vCPUs.
+
+## VCPU hotplug ##
+
+VCPUs can be hot-plugged or hot-removed by writing "online" or "offline" to
+xenstore's /local/domain/<domain_id>/cpu/<vcpu_id>/availability entry
--
2.1.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] docs: Specify VCPU hotplug procedure for HVMlite guests
2016-02-03 16:11 [PATCH] docs: Specify VCPU hotplug procedure for HVMlite guests Boris Ostrovsky
@ 2016-02-03 16:20 ` Wei Liu
0 siblings, 0 replies; 2+ messages in thread
From: Wei Liu @ 2016-02-03 16:20 UTC (permalink / raw)
To: Boris Ostrovsky
Cc: keir, ian.campbell, tim, ian.jackson, xen-devel, jbeulich,
wei.liu2, roger.pau
On Wed, Feb 03, 2016 at 11:11:39AM -0500, Boris Ostrovsky wrote:
> HVMlite VCPUs can be added and removed by toggling 'availability'
> value of VCPU's xenstore entry.
>
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> ---
>
> I am not sure this is really needed since it's no different from how we
> do hotplug for PV or HVM/qemu-trad guests.
>
There is no harm to have more document. Not everyone who wants to
implement PVH support is familiar with PV and / or want to look at Linux
and libxl code (for various reasons). ;-)
Wei.
> I may have been a bit too grandiose by describing yesterday's patch as
> "add CPU hotplug support". It was really enabling existing functionality.
>
> docs/misc/hvmlite.markdown | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/docs/misc/hvmlite.markdown b/docs/misc/hvmlite.markdown
> index c1b75c6..1a2e866 100644
> --- a/docs/misc/hvmlite.markdown
> +++ b/docs/misc/hvmlite.markdown
> @@ -80,3 +80,8 @@ are used in order to bring up secondary vCPUs:
> * `VCPUOP_down` is used to bring down a vCPU.
>
> * `VCPUOP_is_up` is used to scan the number of available vCPUs.
> +
> +## VCPU hotplug ##
> +
> +VCPUs can be hot-plugged or hot-removed by writing "online" or "offline" to
> +xenstore's /local/domain/<domain_id>/cpu/<vcpu_id>/availability entry
> --
> 2.1.0
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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