From: Peter Maydell <peter.maydell@linaro.org>
To: Igor Mammedov <imammedo@redhat.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
tangchen@cn.fujitsu.com, ChenFan <chen.fan.fnst@cn.fujitsu.com>,
isimatu.yasuaki@jp.fujitsu.com,
Bharata B Rao <bharata.rao@gmail.com>,
Gu Zheng <guz.fnst@cn.fujitsu.com>,
Anshul Makkar <anshul.makkar@profitbricks.com>,
"afaerber@suse.de" <afaerber@suse.de>
Subject: Re: [Qemu-devel] [RFC V2 10/10] cpus: reclaim allocated vCPU objects
Date: Mon, 8 Dec 2014 16:38:38 +0000 [thread overview]
Message-ID: <CAFEAcA8cRDc7JYA1Q61GwT3x9HUFmLQ70WO---S9naMZ9JzfFw@mail.gmail.com> (raw)
In-Reply-To: <20141208163815.40bcb9e2@nial.usersys.redhat.com>
On 8 December 2014 at 15:38, Igor Mammedov <imammedo@redhat.com> wrote:
> On Mon, 8 Dec 2014 10:50:21 +0000
> Peter Maydell <peter.maydell@linaro.org> wrote:
>> Why can't the kernel handle our just destroying the vcpu and
>> later recreating it if necessary? That seems the more logical
>> approach than trying to keep fds hanging around in userspace
>> for reuse.
>
> It's somewhat complex approach and it was suggested on KVM list to go
> parking route. for more details see thread
> https://www.mail-archive.com/kvm@vger.kernel.org/msg102839.html
If the kernel can't cope with userspace creating and destroying
vCPUs dynamically then that seems like a kernel bug to me.
It seems better to me to fix that directly rather than make
non-x86 architectures change things around to help with working
around that bug...
thanks
-- PMM
next prev parent reply other threads:[~2014-12-08 16:39 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-28 3:36 [Qemu-devel] [RFC V2 00/10] cpu: add device_add foo-x86_64-cpu and i386 cpu hot remove support Gu Zheng
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 01/10] cpu: introduce CpuTopoInfo structure for argument simplification Gu Zheng
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 02/10] qom/cpu: move register_vmstate to common CPUClass.realizefn Gu Zheng
2014-09-09 12:17 ` Igor Mammedov
2014-09-10 2:38 ` Gu Zheng
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 03/10] cpu: add device_add foo-x86_64-cpu support Gu Zheng
2014-09-09 12:44 ` Igor Mammedov
2014-09-10 3:37 ` Gu Zheng
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 04/10] x86: add x86_cpu_unrealizefn() for cpu apic remove Gu Zheng
2014-09-09 13:58 ` Igor Mammedov
2014-09-11 3:06 ` Gu Zheng
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 05/10] i386: add cpu device_del support Gu Zheng
2014-09-09 14:11 ` Igor Mammedov
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 06/10] qom cpu: rename variable 'cpu_added_notifier' to 'cpu_hotplug_notifier' Gu Zheng
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 07/10] qom cpu: add UNPLUG cpu notify support Gu Zheng
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 08/10] i386: implement pc interface cpu_common_unrealizefn() in qom/cpu.c Gu Zheng
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 09/10] cpu hotplug: implement function cpu_status_write() for vcpu ejection Gu Zheng
2014-09-09 14:28 ` Igor Mammedov
2014-08-28 3:36 ` [Qemu-devel] [RFC V2 10/10] cpus: reclaim allocated vCPU objects Gu Zheng
2014-09-09 14:40 ` Igor Mammedov
2014-09-10 3:54 ` Gu Zheng
2014-09-11 9:35 ` Bharata B Rao
2014-09-11 9:49 ` Gu Zheng
2014-09-11 9:53 ` Gu Zheng
2014-09-11 12:37 ` Bharata B Rao
2014-09-12 1:24 ` Gu Zheng
2014-09-12 8:09 ` Bharata B Rao
2014-09-12 9:53 ` Gu Zheng
2014-09-12 10:30 ` Bharata B Rao
2014-09-12 10:53 ` Anshul Makkar
2014-09-12 13:52 ` Bharata B Rao
2014-09-12 15:34 ` Anshul Makkar
2014-09-15 6:39 ` Gu Zheng
2014-09-15 10:09 ` Bharata B Rao
2014-09-15 10:33 ` Anshul Makkar
2014-09-15 13:53 ` Bharata B Rao
2014-09-15 14:29 ` Anshul Makkar
2014-09-11 10:03 ` Anshul Makkar
2014-09-12 14:15 ` Igor Mammedov
2014-09-15 5:03 ` Gu Zheng
2014-12-08 9:16 ` Bharata B Rao
2014-12-08 9:26 ` Peter Maydell
2014-12-08 10:28 ` Gu Zheng
2014-12-08 10:50 ` Peter Maydell
2014-12-08 15:38 ` Igor Mammedov
2014-12-08 16:38 ` Peter Maydell [this message]
2014-12-09 0:58 ` Gu Zheng
2014-12-08 10:12 ` Gu Zheng
2014-11-12 1:46 ` [Qemu-devel] [RFC V2 00/10] cpu: add device_add foo-x86_64-cpu and i386 cpu hot remove support Gu Zheng
2014-11-12 1:46 ` Gu Zheng
2014-11-12 7:57 ` Igor Mammedov
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