[PATCH] KVM: PPC: Book3S HV: POWER9 more doorbell fixes

[Paul Mackerras]

On Tue, Oct 10, 2017 at 08:18:28PM +1000, Nicholas Piggin wrote:
> - Add another case where msgsync is required.
> - Required barrier sequence for global doorbells is msgsync ; lwsync
> - POWER9 DD1 has a different barrier sequence that we don't implement,
>   so remove
> 
> When msgsnd is used for IPIs to other cores, msgsync must be executed by
> the target to order stores performed on the source before its msgsnd
> (provided the source executes the appropriate sync).
> 
> Fixes: 1704a81ccebc ("KVM: PPC: Book3S HV: Use msgsnd for IPIs to other cores on POWER9")
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>

Thanks, applied to my kvm-ppc-fixes branch (minus the comment about DD1).

Paul.