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Re: [Qemu-devel] [PATCH 1/3] qga: introduce guest-get-vcpus / guest-set-
From: |
Laszlo Ersek |
Subject: |
Re: [Qemu-devel] [PATCH 1/3] qga: introduce guest-get-vcpus / guest-set-vcpus with stubs |
Date: |
Wed, 06 Mar 2013 00:32:54 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130216 Thunderbird/17.0.3 |
On 03/06/13 00:12, Eric Blake wrote:
> The old cpu_set HMP command "worked" in something like qemu 0.10, and
> was ripped out when we realized it didn't actually work in a way that
> was guaranteed to be safe to the guest. Since then, the libvirt command
> has been a guaranteed failure on qemu, although it continues to work on
> xen (and since it has been several YEARS now of not working, people are
> laughing at qemu for not getting cpu hotplug working when xen has had it
> for so long).
Under xen there's a separate comms method for requesting this (dom0 side
massaging of a specific node in xenstore + xenstore watch in the guest
kernel on that node).
http://wiki.xen.org/wiki/XenBus
http://wiki.xen.org/wiki/Event_Channel_Internals
>> I'll have to test this in RHEL-6. If it doesn't work, I should check
>> why. If it does, I'll have to figure out if I should continue to work on
>> this.
>
> Yes, PLEASE continue to work on this - having the guest agent as an
> alternative to ACPI has proven useful in other respects (for example, we
> wired up virDomainShutdownFlags() to let the user choose between
> guest-agent, ACPI, or hypervisor choice).
OK.
Laszlo
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, (continued)
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Eric Blake, 2013/03/05
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Laszlo Ersek, 2013/03/05
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Eric Blake, 2013/03/05
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Laszlo Ersek, 2013/03/05
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Paolo Bonzini, 2013/03/06
- Re: [Qemu-devel] [PATCH 3/3] qga: implement qmp_guest_set_vcpus() for Linux with sysfs, Eric Blake, 2013/03/06
[Qemu-devel] [PATCH 1/3] qga: introduce guest-get-vcpus / guest-set-vcpus with stubs, Laszlo Ersek, 2013/03/04
[Qemu-devel] [PATCH 2/3] qga: implement qmp_guest_get_vcpus() for Linux with sysfs, Laszlo Ersek, 2013/03/04
Re: [Qemu-devel] [PATCH 2/3] qga: implement qmp_guest_get_vcpus() for Linux with sysfs, Eric Blake, 2013/03/05