On Mon, Sep 20, 2021 at 05:06:15PM +0200, Christian Borntraeger wrote:

Stable team,

here is a backport for 4.19 of
commit a3e03bc1368 ("KVM: s390: index kvm->arch.idle_mask by vcpu_idx")
This basically removes the kick_mask parts that were introduced with
kernel 5.0 and fixes up the location of the idle_mask to the older
place.

Now queued up, thanks.

FWIW, it might be a good idea to also backport
8750e72a79dd ("KVM: remember position in kvm->vcpus array") to avoid
a performance regression for large guests (many vCPUs) when this patch
is applied. 
@Paolo Bonzini, would you be ok with 8750e72a79dd in older stable releases?

That would also have to go into 5.4.y, right?

thanks,

greg k-h