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Re: [PATCH v2] hw/i386: disable smbus migration for xenfv

From: Paolo Bonzini
Subject: Re: [PATCH v2] hw/i386: disable smbus migration for xenfv
Date: Thu, 16 Jan 2020 19:50:10 +0100

Il gio 16 gen 2020, 19:33 Olaf Hering <address@hidden> ha scritto:
Am Thu, 16 Jan 2020 19:26:39 +0100
schrieb Paolo Bonzini <address@hidden>:

> xenfv does not support cross-version migration compatibility.

Wait, what does that mean?
So far live migration of a running domU must be possible from Xen N to Xen N+1.

TheĀ  Xen N+1 must know that the source is running Xen N, and use a machine type corresponding to the QEMU version that was shipped with Xen N. For new virtual machines Xen must also use pc-i440fx-M.N and not just PC.

This is not new, versioned machine types were introduced in QEMU 0.10 or something like that for exactly this purpose.


It would be more than unexpected if the target host running "Xen N+1" must have the very same qemu version as "Xen N".


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