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Re: [Qemu-devel] [PATCH 1/3] virtio: Introduce VirtIODevice.broken


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 1/3] virtio: Introduce VirtIODevice.broken
Date: Tue, 29 Apr 2014 15:21:56 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

Il 28/04/2014 04:59, Michael S. Tsirkin ha scritto:
All in all, it seems like a lot of work.

But I think I see a nice elegant solution : stop the VM when
some device detects an internal error and becomes broken.
This should be a general event telling management that this
happened - similar to pvpanic event. Management will add
options to restart guest/reset guest/report to user/dump memory.

This is marginally better than exiting, but has the same problems. For example, say we have nested VM with VT-d support in QEMU, and do PCI passthrough of virtio devices. If the L2 device has a broken driver, pausing the L1 virtual machine violates isolation just as much as exiting QEMU.

Paolo



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