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Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced |
Date: |
Wed, 29 Feb 2012 12:39:29 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0 |
On 02/29/2012 12:17 PM, Wen Congyang wrote:
> >>>
> >> 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...
We have the same issue with the hypercall; and virtio-serial is
available on many deployed versions.
> >
> >>>> 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.
We won't have a 100% reliable way. But I think a variant of the driver
that doesn't use interrupts, or just using the ordinary serial driver,
should be reliable enough.
--
error compiling committee.c: too many arguments to function
- 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, 2012/02/29
- Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced,
Avi Kivity <=
- 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
Re: [Qemu-devel] [PATCH] kvm: notify host when guest paniced, Avi Kivity, 2012/02/29