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Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2
From: |
Yoshiaki Tamura |
Subject: |
Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2 |
Date: |
Sat, 27 Nov 2010 21:35:55 +0900 |
2010/11/27 Paul Brook <address@hidden>:
>> One question I have about Kemari is whether it adds new constraints to
>> the QEMU codebase? Fault tolerance seems like a cross-cutting concern
>> - everyone writing device emulation or core QEMU code may need to be
>> aware of new constraints. For example, "you are not allowed to
>> release I/O operations to the outside world directly, instead you need
>> to go through Kemari code which makes I/O transactional and
>> communicates with the passive host". You have converted e1000,
>> virtio-net, and virtio-blk. How do we make sure new devices that are
>> merged into qemu.git don't break Kemari? How do we go about
>> supporting the existing hw/* devices?
>
> IMO anything that requires devices to act differently is wrong. All external
> IO already goes though a common API (e.g. qemu_send_packet). You should be
> putting your transaction code there, not hacking individual devices.
So you're with Blue's idea to put them in block/net layer.
Yoshi
>
> Paul
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- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, (continued)
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Paul Brook, 2010/11/29
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Yoshiaki Tamura, 2010/11/29
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Paul Brook, 2010/11/29
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Stefan Hajnoczi, 2010/11/29
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Dor Laor, 2010/11/29
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Paul Brook, 2010/11/29
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Anthony Liguori, 2010/11/29
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Paul Brook, 2010/11/29
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Anthony Liguori, 2010/11/29
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2, Paul Brook, 2010/11/27
- Re: [Qemu-devel] [PATCH 00/21] Kemari for KVM 0.2,
Yoshiaki Tamura <=