[PATCH 1/2] KVM: PPC: Book3S HV: Fix race in re-enabling XIVE escalation interrupts

[Paul Mackerras]

On Mon, Aug 12, 2019 at 03:07:05PM +1000, Paul Mackerras wrote:

>  	lbz	r5, VCPU_XIVE_ESC_ON(r9)
>  	cmpwi	r5, 0
> -	beq	1f
> +	beq	4f
>  	li	r0, 0
>  	stb	r0, VCPU_CEDED(r9)
> +	li	r6, XIVE_ESB_SET_PQ_10
> +	b	1f
> +4:	li	r0, 1
> +	stb	r0, VCPU_XIVE_ESC_ON(r9)

This ends up setting vcpu->arch.xive_esc_on even on platforms without
XIVE, which is wrong.  I'll send a v2.

Paul.