Re: [Qemu-devel] [RFC 4/4] Relevant changes to enable KVM to TCG migration

[alvise rigo]

Improvements of cpreg emulation apart, we will still need to tackle
with the great amount of registers not migrated because generated

by a wildcarded register; some of these registers are in fact migrated
by KVM. I think that the idea of keeping a reference

to the generator register (i.e. the only register which is migrated in a

wildcarded case) could be considered to handle the migration.

alvise

On Wed, Feb 26, 2014 at 11:04 AM, Peter Maydell <address@hidden> wrote:

On 26 February 2014 10:02, alvise rigo <address@hidden> wrote:
> I agree that this is a sort of workaround, but it seems to me that a
> proper solution is not possible without changing the ideas contemplated
> now in the migration code.
> Are we willing to accept some major changes in the code to embrace
> this type of migration?

Well, the migration code as it stands is in theory supposed to cope
with KVM<->TCG migration. I would expect that we'd need to improve
a number of places where our TCG cpreg emulation is wrong.

thanks
-- PMM