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Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycl
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem |
Date: |
Mon, 27 Aug 2012 11:09:43 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0 |
On 08/27/2012 10:14 AM, Jan Kiszka wrote:
> >
> > Deregistration is fine, the problem is destruction.
> >
>
> It isn't as you access memory region states that can change after
> deregistration. Devices can remove memory regions from the mapping,
> alter and then reinsert them. The last to steps must not happen while
> anyone is still using a reference to that region.
>
Why not? If the guest is accessing an mmio region while reconfiguring
it in a way that changes its meaning, either the previous or the next
meaning is valid.
It is true that memory_region_set_enabled(..., false) will become weaker
as a result. Code will have to be prepared for that.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
- [Qemu-devel] [PATCH 09/10] mon: release dev's ref hold by qdev_get_peripheral, (continued)
- [Qemu-devel] [PATCH 09/10] mon: release dev's ref hold by qdev_get_peripheral, Liu Ping Fan, 2012/08/24
- [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Liu Ping Fan, 2012/08/24
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Paolo Bonzini, 2012/08/24
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, liu ping fan, 2012/08/25
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Paolo Bonzini, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Jan Kiszka, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, liu ping fan, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Jan Kiszka, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Avi Kivity, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Jan Kiszka, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem,
Avi Kivity <=
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Jan Kiszka, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Avi Kivity, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Jan Kiszka, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Avi Kivity, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Jan Kiszka, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Avi Kivity, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Jan Kiszka, 2012/08/27
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Avi Kivity, 2012/08/29
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Jan Kiszka, 2012/08/29
- Re: [Qemu-devel] [PATCH 10/10] qdev: fix create in place obj's life cycle problem, Avi Kivity, 2012/08/29