Re: [Qemu-devel] An emulation failure occurs, if I hotplug vcpus immediately after the VM start

[David Hildenbrand <david@redhat.com>]

On 11.06.2018 14:25, Gonglei (Arei) wrote:
> 
> Hi David and Paolo,
> 
>> -----Original Message-----
>> From: David Hildenbrand [mailto:david@redhat.com]
>> Sent: Monday, June 11, 2018 6:44 PM
>> To: 浙大邮箱 <linzc@zju.edu.cn>
>> Cc: Paolo Bonzini <pbonzini@redhat.com>; Gonglei (Arei)
>> <arei.gonglei@huawei.com>; Igor Mammedov <imammedo@redhat.com>;
>> xuyandong <xuyandong2@huawei.com>; Zhanghailiang
>> <zhang.zhanghailiang@huawei.com>; wangxin (U)
>> <wangxinxin.wang@huawei.com>; lidonglin <lidonglin@huawei.com>;
>> kvm@vger.kernel.org; qemu-devel@nongnu.org; Huangweidong (C)
>> <weidong.huang@huawei.com>
>> Subject: Re: An emulation failure occurs,if I hotplug vcpus immediately after the
>> VM start
>>
>> On 07.06.2018 18:03, 浙大邮箱 wrote:
>>> Hi，all
>>> I still have a question after reading your discussion: Will seabios detect the
>> change of address space even if we add_region and del_region automatically? I
>> guess that seabios may not take this change into consideration.
>>
>> Hi,
>>
>> We would just change the way how KVM memory slots are updated. This is
>> right now not atomic, but would be later on. It should not have any
>> other effect.
>>
> Yes. Do you have any plans to do that? 

Well, I have plans to work on atomically resizable memory regions
(atomic del + add), and what Paolo described could also work for that
use case. However, I won't have time to look into that in the near
future. So if somebody else wants to jump it, perfect. If not, it will
have to wait unfortunately.

> 
> Thanks,
> -Gonglei
> 


-- 

Thanks,

David / dhildenb