Re: [PATCH v4 0/4] SEV Live Migration support for OVMF.


Dov Murik
 

+cc Tobin


On 22/06/2021 20:46, Ashish Kalra via groups.io wrote:
Hello Laszlo,

Please see my replies below :

On Tue, Jun 22, 2021 at 07:20:53PM +0200, Laszlo Ersek wrote:
-snip-



Anyway, where I'm particularly lost is that I (very vaguely) recall conflicting approaches from AMD and IBM on migration. Has an agreement been reached there?
Yes, these are the slow SEV live migration patches. The fast migration
support is being developed by IBM and that is a separate effort.

As this slow live migration support has now been included in KVM, we
will need the corresponding OVMF and QEMU support now.

I'll also add that the fast (guest-assisted) SEV migration we (IBM) are
working on uses some of the features of the "slow" migration. For
example, for sure, patches 1-3 in this series will be needed to keep the
record of which of the guest pages are encrypted and which are shared
(also in fast migration).

-Dov

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