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Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device
From: |
Isaku Yamahata |
Subject: |
Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy |
Date: |
Fri, 30 Dec 2011 00:53:28 +0900 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Thu, Dec 29, 2011 at 04:55:11PM +0200, Avi Kivity wrote:
> On 12/29/2011 04:49 PM, Isaku Yamahata wrote:
> > > > Great, then we agreed with list/reattach basically.
> > > > (Maybe identity scheme needs reconsideration.)
> > >
> > > I guess we miscommunicated. Why is reattach needed? If you have the
> > > fd, nothing else is needed.
> >
> > What if malicious process close the fd and does page fault intentionally?
> > Unkillable process issue remains.
> > I think we are talking not only qemu case but also general case.
>
> It's not unkillable. If you sleep with TASK_INTERRUPTIBLE then you can
> process signals. This includes SIGKILL.
Hmm, you said that the fault handler doesn't resolve the page fault.
> > Don't resolve the page fault. It's up to the user/system to make sure
> > it happens. qemu can easily do it by watching for the daemon's death
> > and respawning it.
To kill the process, the fault handler must return resolving the fault.
It must return something. What do you expect? VM_FAULT_SIGBUS? zero page?
--
yamahata
- [Qemu-devel] [PATCH 1/2] export necessary symbols, (continued)
- [Qemu-devel] [PATCH 1/2] export necessary symbols, Isaku Yamahata, 2011/12/28
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Avi Kivity, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Isaku Yamahata, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Avi Kivity, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Isaku Yamahata, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Avi Kivity, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Isaku Yamahata, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Avi Kivity, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Isaku Yamahata, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Avi Kivity, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy,
Isaku Yamahata <=
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Avi Kivity, 2011/12/29
- Re: [Qemu-devel] [PATCH 0/2][RFC] postcopy migration: Linux char device for postcopy, Avi Kivity, 2011/12/29