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Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked
From: |
Wen Congyang |
Subject: |
Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked |
Date: |
Wed, 14 Mar 2012 19:11:32 +0800 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100413 Fedora/3.0.4-2.fc13 Thunderbird/3.0.4 |
At 03/14/2012 06:48 PM, Avi Kivity Wrote:
> On 03/14/2012 12:46 PM, Gleb Natapov wrote:
>> On Wed, Mar 14, 2012 at 12:29:57PM +0200, Avi Kivity wrote:
>>> On 03/14/2012 12:26 PM, Wen Congyang wrote:
>>>>>> If so, is this channel visible to guest userspace? If the channle is
>>>>>> visible to guest
>>>>>> userspace, the program running in userspace may write the same message
>>>>>> to the channel.
>>>>>>
>>>>>
>>>>> Surely there's some kind of access control on channels.
>>>>
>>>> The virtio-serial depends on more things than touching the hypervisor. So
>>>> I think touching
>>>> the hypervisor is more reliable than using virtio-serial device, and it is
>>>> very simple and
>>>> easy to use.
>>>>
>>>> If we pass something from guest userspace to host, we can use
>>>> virtio-serial. But If we pass
>>>> something from guest kernelspace to host, I still prefer to touch the
>>>> hypervisor.
>>>
>>> There's no argument that it's easier. My concern is different, we're
>>> adding more and more stuff to the hypervisor because it's easier, which
>>> bloats it. Every time we do it we add to compatibility and security
>>> problems.
>>>
>>> The panic notification is *really* simple, so I don't expect it to cause
>>> a lot of problems. But still, if it's possible not to change the
>>> hypervisor, we must make an effort in that direction.
>>>
>> One more point against using virtio-serial is that it will be likely
>> compiled as a module which means panic during early boot will not be
>> reported.
>
> I don't think we want to use the driver. Instead, have a small piece of
> code that resets the device and pushes out a string (the panic message?)
> without any interrupts etc.
>
> It's still going to be less reliable than a hypercall, I agree.
Do you still want to use complicated and less reliable way?
I think the other ones prefer to touch the hypervisor.
Thanks
Wen Congyang
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, (continued)
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Daniel P. Berrange, 2012/03/13
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Avi Kivity, 2012/03/13
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Wen Congyang, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Avi Kivity, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Wen Congyang, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Avi Kivity, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Wen Congyang, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Avi Kivity, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Gleb Natapov, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Avi Kivity, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked,
Wen Congyang <=
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Avi Kivity, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Avi Kivity, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Gleb Natapov, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Avi Kivity, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Gleb Natapov, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Eric Northup, 2012/03/14
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Wen Congyang, 2012/03/15
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Gleb Natapov, 2012/03/15
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Jan Kiszka, 2012/03/15
- Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked, Avi Kivity, 2012/03/15