Re: [PATCH 46/59] KVM: arm64: nv: arch_timer: Support hyp timer emulation

[Alexandru Elisei <alexandru.elisei@arm.com>]

On 6/21/19 10:38 AM, Marc Zyngier wrote:
> From: Christoffer Dall <christoffer.dall@arm.com>
>
> Emulating EL2 also means emulating the EL2 timers. To do so, we expand
> our timer framework to deal with at most 4 timers. At any given time,
> two timers are using the HW timers, and the two others are purely
> emulated.
>
> The role of deciding which is which at any given time is left to a
> mapping function which is called every time we need to make such a
> decision.
>
> Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
>  arch/arm/include/asm/kvm_emulate.h |   2 +
>  include/kvm/arm_arch_timer.h       |   5 ++
>  include/kvm/arm_vgic.h             |   1 +
>  virt/kvm/arm/arch_timer.c          | 122 ++++++++++++++++++++++++++++-
>  virt/kvm/arm/trace.h               |   6 +-
>  virt/kvm/arm/vgic/vgic.c           |  15 ++++
>  6 files changed, 147 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h
> index 6b7644a383f6..865ce545b465 100644
> --- a/arch/arm/include/asm/kvm_emulate.h
> +++ b/arch/arm/include/asm/kvm_emulate.h
> @@ -333,4 +333,6 @@ static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
>  
>  static inline void vcpu_ptrauth_setup_lazy(struct kvm_vcpu *vcpu) {}
>  
> +static inline bool is_hyp_ctxt(struct kvm_vcpu *vcpu) { return false; }
> +
>  #endif /* __ARM_KVM_EMULATE_H__ */
> diff --git a/include/kvm/arm_arch_timer.h b/include/kvm/arm_arch_timer.h
> index d120e6c323e7..3a5d9255120e 100644
> --- a/include/kvm/arm_arch_timer.h
> +++ b/include/kvm/arm_arch_timer.h
> @@ -13,6 +13,8 @@
>  enum kvm_arch_timers {
>  	TIMER_PTIMER,
>  	TIMER_VTIMER,
> +	TIMER_HVTIMER,
> +	TIMER_HPTIMER,
>  	NR_KVM_TIMERS
>  };
>  
> @@ -54,6 +56,7 @@ struct arch_timer_context {
>  struct timer_map {
>  	struct arch_timer_context *direct_vtimer;
>  	struct arch_timer_context *direct_ptimer;
> +	struct arch_timer_context *emul_vtimer;
>  	struct arch_timer_context *emul_ptimer;
>  };
>  
> @@ -98,6 +101,8 @@ bool kvm_arch_timer_get_input_level(int vintid);
>  #define vcpu_get_timer(v,t)	(&vcpu_timer(v)->timers[(t)])
>  #define vcpu_vtimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_VTIMER])
>  #define vcpu_ptimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_PTIMER])
> +#define vcpu_hvtimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_HVTIMER])
> +#define vcpu_hptimer(v)	(&(v)->arch.timer_cpu.timers[TIMER_HPTIMER])
>  
>  #define arch_timer_ctx_index(ctx)	((ctx) - vcpu_timer((ctx)->vcpu)->timers)
>  
> diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
> index c36c86f1ec9a..7fc3b413b3de 100644
> --- a/include/kvm/arm_vgic.h
> +++ b/include/kvm/arm_vgic.h
> @@ -355,6 +355,7 @@ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
>  int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
>  			  u32 vintid, bool (*get_input_level)(int vindid));
>  int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid);
> +int kvm_vgic_get_map(struct kvm_vcpu *vcpu, unsigned int vintid);
>  bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid);
>  
>  int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
> diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
> index 089441a07ed7..3d84c240071d 100644
> --- a/virt/kvm/arm/arch_timer.c
> +++ b/virt/kvm/arm/arch_timer.c
> @@ -15,6 +15,7 @@
>  #include <asm/arch_timer.h>
>  #include <asm/kvm_emulate.h>
>  #include <asm/kvm_hyp.h>
> +#include <asm/kvm_nested.h>
>  
>  #include <kvm/arm_vgic.h>
>  #include <kvm/arm_arch_timer.h>
> @@ -39,6 +40,16 @@ static const struct kvm_irq_level default_vtimer_irq = {
>  	.level	= 1,
>  };
>  
> +static const struct kvm_irq_level default_hptimer_irq = {
> +	.irq	= 26,
> +	.level	= 1,
> +};
> +
> +static const struct kvm_irq_level default_hvtimer_irq = {
> +	.irq	= 28,
> +	.level	= 1,
> +};
> +
>  static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx);
>  static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
>  				 struct arch_timer_context *timer_ctx);
> @@ -58,13 +69,27 @@ u64 kvm_phys_timer_read(void)
>  
>  static void get_timer_map(struct kvm_vcpu *vcpu, struct timer_map *map)
>  {
> -	if (has_vhe()) {
> +	if (nested_virt_in_use(vcpu)) {
> +		if (is_hyp_ctxt(vcpu)) {
> +			map->direct_vtimer = vcpu_hvtimer(vcpu);
> +			map->direct_ptimer = vcpu_hptimer(vcpu);
> +			map->emul_vtimer = vcpu_vtimer(vcpu);
> +			map->emul_ptimer = vcpu_ptimer(vcpu);
> +		} else {
> +			map->direct_vtimer = vcpu_vtimer(vcpu);
> +			map->direct_ptimer = vcpu_ptimer(vcpu);
> +			map->emul_vtimer = vcpu_hvtimer(vcpu);
> +			map->emul_ptimer = vcpu_hptimer(vcpu);
> +		}
> +	} else if (has_vhe()) {
>  		map->direct_vtimer = vcpu_vtimer(vcpu);
>  		map->direct_ptimer = vcpu_ptimer(vcpu);
> +		map->emul_vtimer = NULL;
>  		map->emul_ptimer = NULL;
>  	} else {
>  		map->direct_vtimer = vcpu_vtimer(vcpu);
>  		map->direct_ptimer = NULL;
> +		map->emul_vtimer = NULL;
>  		map->emul_ptimer = vcpu_ptimer(vcpu);
>  	}
>  
> @@ -237,9 +262,11 @@ static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx)
>  
>  		switch (index) {
>  		case TIMER_VTIMER:
> +		case TIMER_HVTIMER:
>  			cnt_ctl = read_sysreg_el0(SYS_CNTV_CTL);
>  			break;
>  		case TIMER_PTIMER:
> +		case TIMER_HPTIMER:
>  			cnt_ctl = read_sysreg_el0(SYS_CNTP_CTL);
>  			break;
>  		case NR_KVM_TIMERS:
> @@ -270,6 +297,7 @@ bool kvm_timer_is_pending(struct kvm_vcpu *vcpu)
>  
>  	return kvm_timer_should_fire(map.direct_vtimer) ||
>  	       kvm_timer_should_fire(map.direct_ptimer) ||
> +	       kvm_timer_should_fire(map.emul_vtimer) ||
>  	       kvm_timer_should_fire(map.emul_ptimer);
>  }
>  
> @@ -349,6 +377,7 @@ static void timer_save_state(struct arch_timer_context *ctx)
>  
>  	switch (index) {
>  	case TIMER_VTIMER:
> +	case TIMER_HVTIMER:
>  		ctx->cnt_ctl = read_sysreg_el0(SYS_CNTV_CTL);
>  		ctx->cnt_cval = read_sysreg_el0(SYS_CNTV_CVAL);
>  
> @@ -358,6 +387,7 @@ static void timer_save_state(struct arch_timer_context *ctx)
>  
>  		break;
>  	case TIMER_PTIMER:
> +	case TIMER_HPTIMER:
>  		ctx->cnt_ctl = read_sysreg_el0(SYS_CNTP_CTL);
>  		ctx->cnt_cval = read_sysreg_el0(SYS_CNTP_CVAL);
>  
> @@ -395,6 +425,7 @@ static void kvm_timer_blocking(struct kvm_vcpu *vcpu)
>  	 */
>  	if (!kvm_timer_irq_can_fire(map.direct_vtimer) &&
>  	    !kvm_timer_irq_can_fire(map.direct_ptimer) &&
> +	    !kvm_timer_irq_can_fire(map.emul_vtimer) &&
>  	    !kvm_timer_irq_can_fire(map.emul_ptimer))
>  		return;
>  
> @@ -428,11 +459,13 @@ static void timer_restore_state(struct arch_timer_context *ctx)
>  
>  	switch (index) {
>  	case TIMER_VTIMER:
> +	case TIMER_HVTIMER:
>  		write_sysreg_el0(ctx->cnt_cval, SYS_CNTV_CVAL);
>  		isb();
>  		write_sysreg_el0(ctx->cnt_ctl, SYS_CNTV_CTL);
>  		break;
>  	case TIMER_PTIMER:
> +	case TIMER_HPTIMER:
>  		write_sysreg_el0(ctx->cnt_cval, SYS_CNTP_CVAL);
>  		isb();
>  		write_sysreg_el0(ctx->cnt_ctl, SYS_CNTP_CTL);
> @@ -519,6 +552,40 @@ static void kvm_timer_vcpu_load_nogic(struct kvm_vcpu *vcpu)
>  		enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags);
>  }
>  
> +static void kvm_timer_vcpu_load_nested_switch(struct kvm_vcpu *vcpu,
> +					      struct timer_map *map)
> +{
> +	int hw, ret;
> +
> +	if (!irqchip_in_kernel(vcpu->kvm))
> +		return;
> +
> +	/*
> +	 * We only ever unmap the vtimer irq on a VHE system that runs nested
> +	 * virtualization, in which case we have both a valid emul_vtimer,
> +	 * emul_ptimer, direct_vtimer, and direct_ptimer.
> +	 *
> +	 * Since this is called from kvm_timer_vcpu_load(), a change between
> +	 * vEL2 and vEL1/0 will have just happened, and the timer_map will
> +	 * represent this, and therefore we switch the emul/direct mappings
> +	 * below.
> +	 */
> +	hw = kvm_vgic_get_map(vcpu, map->direct_vtimer->irq.irq);
> +	if (hw < 0) {
> +		kvm_vgic_unmap_phys_irq(vcpu, map->emul_vtimer->irq.irq);
> +		kvm_vgic_unmap_phys_irq(vcpu, map->emul_ptimer->irq.irq);
> +
> +		ret = kvm_vgic_map_phys_irq(vcpu,
> +					    map->direct_vtimer->host_timer_irq,
> +					    map->direct_vtimer->irq.irq,
> +					    kvm_arch_timer_get_input_level);
> +		ret = kvm_vgic_map_phys_irq(vcpu,
> +					    map->direct_ptimer->host_timer_irq,
> +					    map->direct_ptimer->irq.irq,
> +					    kvm_arch_timer_get_input_level);
> +	}
> +}
> +
>  void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu)
>  {
>  	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
> @@ -530,6 +597,8 @@ void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu)
>  	get_timer_map(vcpu, &map);
>  
>  	if (static_branch_likely(&has_gic_active_state)) {
> +		kvm_timer_vcpu_load_nested_switch(vcpu, &map);

Would it be possible for this be a conditional call that depends on
nested_virt_in_use(vcpu), since that's the only situation where we change the
direct_vtimer when we switch from vEL1 to vEL2 or viceversa?

Thanks,
Alex
> +
>  		kvm_timer_vcpu_load_gic(map.direct_vtimer);
>  		if (map.direct_ptimer)
>  			kvm_timer_vcpu_load_gic(map.direct_ptimer);
> @@ -545,6 +614,8 @@ void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu)
>  	if (map.direct_ptimer)
>  		timer_restore_state(map.direct_ptimer);
>  
> +	if (map.emul_vtimer)
> +		timer_emulate(map.emul_vtimer);
>  	if (map.emul_ptimer)
>  		timer_emulate(map.emul_ptimer);
>  }
> @@ -589,6 +660,8 @@ void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
>  	 * In any case, we re-schedule the hrtimer for the physical timer when
>  	 * coming back to the VCPU thread in kvm_timer_vcpu_load().
>  	 */
> +	if (map.emul_vtimer)
> +		soft_timer_cancel(&map.emul_vtimer->hrtimer);
>  	if (map.emul_ptimer)
>  		soft_timer_cancel(&map.emul_ptimer->hrtimer);
>  
> @@ -649,10 +722,14 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu)
>  	 */
>  	vcpu_vtimer(vcpu)->cnt_ctl = 0;
>  	vcpu_ptimer(vcpu)->cnt_ctl = 0;
> +	vcpu_hvtimer(vcpu)->cnt_ctl = 0;
> +	vcpu_hptimer(vcpu)->cnt_ctl = 0;
>  
>  	if (timer->enabled) {
>  		kvm_timer_update_irq(vcpu, false, vcpu_vtimer(vcpu));
>  		kvm_timer_update_irq(vcpu, false, vcpu_ptimer(vcpu));
> +		kvm_timer_update_irq(vcpu, false, vcpu_hvtimer(vcpu));
> +		kvm_timer_update_irq(vcpu, false, vcpu_hptimer(vcpu));
>  
>  		if (irqchip_in_kernel(vcpu->kvm)) {
>  			kvm_vgic_reset_mapped_irq(vcpu, map.direct_vtimer->irq.irq);
> @@ -661,6 +738,8 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu)
>  		}
>  	}
>  
> +	if (map.emul_vtimer)
> +		soft_timer_cancel(&map.emul_vtimer->hrtimer);
>  	if (map.emul_ptimer)
>  		soft_timer_cancel(&map.emul_ptimer->hrtimer);
>  
> @@ -691,30 +770,46 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
>  	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
>  	struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
>  	struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
> +	struct arch_timer_context *hvtimer = vcpu_hvtimer(vcpu);
> +	struct arch_timer_context *hptimer = vcpu_hptimer(vcpu);
>  
>  	/* Synchronize cntvoff across all vtimers of a VM. */
>  	update_vtimer_cntvoff(vcpu, kvm_phys_timer_read());
>  	ptimer->cntvoff = 0;
> +	hvtimer->cntvoff = 0;
> +	hptimer->cntvoff = 0;
>  
>  	hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
>  	timer->bg_timer.function = kvm_bg_timer_expire;
>  
>  	hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
>  	hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
> +	hrtimer_init(&hvtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
> +	hrtimer_init(&hptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
>  	vtimer->hrtimer.function = kvm_hrtimer_expire;
>  	ptimer->hrtimer.function = kvm_hrtimer_expire;
> +	hvtimer->hrtimer.function = kvm_hrtimer_expire;
> +	hptimer->hrtimer.function = kvm_hrtimer_expire;
>  
>  	vtimer->irq.irq = default_vtimer_irq.irq;
>  	ptimer->irq.irq = default_ptimer_irq.irq;
> +	hvtimer->irq.irq = default_hvtimer_irq.irq;
> +	hptimer->irq.irq = default_hptimer_irq.irq;
>  
>  	vtimer->host_timer_irq = host_vtimer_irq;
>  	ptimer->host_timer_irq = host_ptimer_irq;
> +	hvtimer->host_timer_irq = host_vtimer_irq;
> +	hptimer->host_timer_irq = host_ptimer_irq;
>  
>  	vtimer->host_timer_irq_flags = host_vtimer_irq_flags;
>  	ptimer->host_timer_irq_flags = host_ptimer_irq_flags;
> +	hvtimer->host_timer_irq_flags = host_vtimer_irq_flags;
> +	hptimer->host_timer_irq_flags = host_ptimer_irq_flags;
>  
>  	vtimer->vcpu = vcpu;
>  	ptimer->vcpu = vcpu;
> +	hvtimer->vcpu = vcpu;
> +	hptimer->vcpu = vcpu;
>  }
>  
>  static void kvm_timer_init_interrupt(void *info)
> @@ -997,7 +1092,7 @@ void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu)
>  
>  static bool timer_irqs_are_valid(struct kvm_vcpu *vcpu)
>  {
> -	int vtimer_irq, ptimer_irq;
> +	int vtimer_irq, ptimer_irq, hvtimer_irq, hptimer_irq;
>  	int i, ret;
>  
>  	vtimer_irq = vcpu_vtimer(vcpu)->irq.irq;
> @@ -1010,9 +1105,21 @@ static bool timer_irqs_are_valid(struct kvm_vcpu *vcpu)
>  	if (ret)
>  		return false;
>  
> +	hvtimer_irq = vcpu_hvtimer(vcpu)->irq.irq;
> +	ret = kvm_vgic_set_owner(vcpu, hvtimer_irq, vcpu_hvtimer(vcpu));
> +	if (ret)
> +		return false;
> +
> +	hptimer_irq = vcpu_hptimer(vcpu)->irq.irq;
> +	ret = kvm_vgic_set_owner(vcpu, hptimer_irq, vcpu_hptimer(vcpu));
> +	if (ret)
> +		return false;
> +
>  	kvm_for_each_vcpu(i, vcpu, vcpu->kvm) {
>  		if (vcpu_vtimer(vcpu)->irq.irq != vtimer_irq ||
> -		    vcpu_ptimer(vcpu)->irq.irq != ptimer_irq)
> +		    vcpu_ptimer(vcpu)->irq.irq != ptimer_irq ||
> +		    vcpu_hvtimer(vcpu)->irq.irq != hvtimer_irq ||
> +		    vcpu_hptimer(vcpu)->irq.irq != hptimer_irq)
>  			return false;
>  	}
>  
> @@ -1028,6 +1135,10 @@ bool kvm_arch_timer_get_input_level(int vintid)
>  		timer = vcpu_vtimer(vcpu);
>  	else if (vintid == vcpu_ptimer(vcpu)->irq.irq)
>  		timer = vcpu_ptimer(vcpu);
> +	else if (vintid == vcpu_hvtimer(vcpu)->irq.irq)
> +		timer = vcpu_hvtimer(vcpu);
> +	else if (vintid == vcpu_hptimer(vcpu)->irq.irq)
> +		timer = vcpu_hptimer(vcpu);
>  	else
>  		BUG();
>  
> @@ -1109,6 +1220,7 @@ static void set_timer_irqs(struct kvm *kvm, int vtimer_irq, int ptimer_irq)
>  	kvm_for_each_vcpu(i, vcpu, kvm) {
>  		vcpu_vtimer(vcpu)->irq.irq = vtimer_irq;
>  		vcpu_ptimer(vcpu)->irq.irq = ptimer_irq;
> +		/* TODO: Add support for hv/hp timers */
>  	}
>  }
>  
> @@ -1119,6 +1231,8 @@ int kvm_arm_timer_set_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
>  	struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
>  	int irq;
>  
> +	/* TODO: Add support for hv/hp timers */
> +
>  	if (!irqchip_in_kernel(vcpu->kvm))
>  		return -EINVAL;
>  
> @@ -1151,6 +1265,8 @@ int kvm_arm_timer_get_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr)
>  	struct arch_timer_context *timer;
>  	int irq;
>  
> +	/* TODO: Add support for hv/hp timers */
> +
>  	switch (attr->attr) {
>  	case KVM_ARM_VCPU_TIMER_IRQ_VTIMER:
>  		timer = vcpu_vtimer(vcpu);
> diff --git a/virt/kvm/arm/trace.h b/virt/kvm/arm/trace.h
> index 204d210d01c2..3b08cc0376f4 100644
> --- a/virt/kvm/arm/trace.h
> +++ b/virt/kvm/arm/trace.h
> @@ -271,6 +271,7 @@ TRACE_EVENT(kvm_get_timer_map,
>  		__field(	unsigned long,		vcpu_id	)
>  		__field(	int,			direct_vtimer	)
>  		__field(	int,			direct_ptimer	)
> +		__field(	int,			emul_vtimer	)
>  		__field(	int,			emul_ptimer	)
>  	),
>  
> @@ -279,14 +280,17 @@ TRACE_EVENT(kvm_get_timer_map,
>  		__entry->direct_vtimer		= arch_timer_ctx_index(map->direct_vtimer);
>  		__entry->direct_ptimer =
>  			(map->direct_ptimer) ? arch_timer_ctx_index(map->direct_ptimer) : -1;
> +		__entry->emul_vtimer =
> +			(map->emul_vtimer) ? arch_timer_ctx_index(map->emul_vtimer) : -1;
>  		__entry->emul_ptimer =
>  			(map->emul_ptimer) ? arch_timer_ctx_index(map->emul_ptimer) : -1;
>  	),
>  
> -	TP_printk("VCPU: %ld, dv: %d, dp: %d, ep: %d",
> +	TP_printk("VCPU: %ld, dv: %d, dp: %d, ev: %d, ep: %d",
>  		  __entry->vcpu_id,
>  		  __entry->direct_vtimer,
>  		  __entry->direct_ptimer,
> +		  __entry->emul_vtimer,
>  		  __entry->emul_ptimer)
>  );
>  
> diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
> index 191deccf60bf..1c5b4dbd33e4 100644
> --- a/virt/kvm/arm/vgic/vgic.c
> +++ b/virt/kvm/arm/vgic/vgic.c
> @@ -569,6 +569,21 @@ int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid)
>  	return 0;
>  }
>  
> +int kvm_vgic_get_map(struct kvm_vcpu *vcpu, unsigned int vintid)
> +{
> +	struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
> +	unsigned long flags;
> +	int ret = -1;
> +
> +	raw_spin_lock_irqsave(&irq->irq_lock, flags);
> +	if (irq->hw)
> +		ret = irq->hwintid;
> +	raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
> +
> +	vgic_put_irq(vcpu->kvm, irq);
> +	return ret;
> +}
> +
>  /**
>   * kvm_vgic_set_owner - Set the owner of an interrupt for a VM
>   *

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