On Wed, 16 Sep 2015 09:13:50 -0400
"Jason J. Herne" <jjherne@xxxxxxxxxxxxxxxxxx> wrote:
> The offending commit accidentally replaces an atomic_clear with an
> atomic_or instead of an atomic_andnot in kvm_s390_vcpu_request_handled.
> The symptom is that kvm guests on s390 hang on startup.
> This patch simply replaces the incorrect atomic_or with atomic_andnot
>
> Signed-off-by: Jason J. Herne <jjherne@xxxxxxxxxxxxxxxxxx>
> ---
> arch/s390/kvm/kvm-s390.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index c91eb94..49e76be 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -1574,7 +1574,7 @@ static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
>
> static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
> {
> - atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
> + atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
> }
>
> /*
Acked-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
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