Re: [Qemu-devel] [PATCH v4 1/1] PPC: KVM: Support machine option to set VSMT mode

[David Gibson <david@gibson.dropbear.id.au>]

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On Fri, Aug 18, 2017 at 03:50:22PM +1000, Sam Bobroff wrote:
> KVM now allows writing to KVM_CAP_PPC_SMT which has previously been
> read only. Doing so causes KVM to act, for that VM, as if the host's
> SMT mode was the given value. This is particularly important on Power
> 9 systems because their default value is 1, but they are able to
> support values up to 8.
> 
> This patch introduces a way to control this capability via a new
> machine property called VSMT ("Virtual SMT"). If the value is not set
> on the command line a default is chosen that is, when possible,
> compatible with legacy systems.
> 
> Note that the intialization of KVM_CAP_PPC_SMT has changed slightly
> because it has changed (in KVM) from a global capability to a
> VM-specific one. This won't cause a problem on older KVMs because VM
> capabilities fall back to global ones.
> 
> Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>

There are some things that could be tweaked, but I see no reason they
can't be done as followups.

Applied to ppc-for-2.11.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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