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Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced
From: |
Wen Congyang |
Subject: |
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced |
Date: |
Wed, 29 Feb 2012 18:17:27 +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 02/29/2012 06:08 PM, Avi Kivity Wrote:
> On 02/29/2012 12:05 PM, Gleb Natapov wrote:
>> On Wed, Feb 29, 2012 at 12:00:41PM +0200, Avi Kivity wrote:
>>> On 02/29/2012 11:55 AM, Gleb Natapov wrote:
>>>>>>
>>>>>
>>>>> How about using a virtio-serial channel for this? You can transfer any
>>>>> amount of information (including the dump itself).
>>>>>
>>>> Isn't it unreliable after the guest panicked?
>>>
>>> So is calling hypercalls, or dumping, or writing to the screen. Of
>>> course calling a hypercall is simpler and so is more reliable.
>>>
>> Yes, crash can be so severe that it is not even detected by a kernel
>> itself, so not OOPS message even printed. But in most cases if kernel is
>> functional enough to print OOPS it is functional enough to call single
>> hypercall instruction.
>
> Why not print the oops to virtio-serial? Or even just a regular serial
> port? That's what bare metal does.
If virtio-serial's driver has bug or the guest doesn't have such device...
>
>>>> Having special kdump
>>>> kernel that transfers dump to a host via virtio-serial channel though
>>>> sounds interesting. May be that's what you mean.
>>>
>>> Yes. The "panic, starting dump" signal should be initiated by the
>>> panicking kernel though, in case the dump fails.
>>>
>> Then panic hypercall sounds like a reasonable solution.
>
> It is, but I'm trying to see if we can get away with doing nothing.
>
If we have a reliable way with doing nothing, it is better. But I donot
find such way.
Thanks
Wen Congyang
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, (continued)
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Avi Kivity, 2012/02/28
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Wen Congyang, 2012/02/28
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Avi Kivity, 2012/02/29
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Gleb Natapov, 2012/02/29
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Avi Kivity, 2012/02/29
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Gleb Natapov, 2012/02/29
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Avi Kivity, 2012/02/29
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced,
Wen Congyang <=
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Avi Kivity, 2012/02/29
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Wen Congyang, 2012/02/29
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Gleb Natapov, 2012/02/29
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Avi Kivity, 2012/02/29
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Gleb Natapov, 2012/02/29
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Daniel P. Berrange, 2012/02/29
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Avi Kivity, 2012/02/29
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Daniel P. Berrange, 2012/02/29
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Avi Kivity, 2012/02/29
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Wen Congyang, 2012/02/29