[PATCH v4 32/56] KVM: arm/arm64: vgic-new: Add SGIPENDR register handlers

[Christoffer Dall]

On Mon, May 16, 2016 at 10:53:20AM +0100, Andre Przywara wrote:
> As this register is v2 specific, its implementation lives entirely
> in vgic-mmio-v2.c.
> This register allows setting the source mask of an IPI.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>
> ---
> Changelog RFC..v1:
> - remove IRQ lock from read handler
> - update pending bit on setting the first / clearing the last bit
> - queue virtual IRQ if necessary
> 
> Changelog v1 .. v2:
> - adapt to new MMIO framework
> 
> Changelog v3 .. v4:
> - specify accessor width
> 
>  virt/kvm/arm/vgic/vgic-mmio-v2.c | 62 ++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 60 insertions(+), 2 deletions(-)
> 
> diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
> index c884e9b..3925d4c 100644
> --- a/virt/kvm/arm/vgic/vgic-mmio-v2.c
> +++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
> @@ -146,6 +146,64 @@ static void vgic_mmio_write_target(struct kvm_vcpu *vcpu,
>  	}
>  }
>  
> +static unsigned long vgic_mmio_read_sgipend(struct kvm_vcpu *vcpu,
> +					    gpa_t addr, unsigned int len)
> +{
> +	u32 intid = addr & 0x0f;

is there a reason why we cannot use the magic macro here?

> +	int i;
> +	u64 val = 0;
> +
> +	for (i = 0; i < len; i++) {
> +		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
> +
> +		val |= (u64)irq->source << (i * 8);
> +	}
> +	return val;
> +}
> +
> +static void vgic_mmio_write_sgipendc(struct kvm_vcpu *vcpu,
> +				     gpa_t addr, unsigned int len,
> +				     unsigned long val)
> +{
> +	u32 intid = addr & 0x0f;
> +	int i;
> +
> +	for (i = 0; i < len; i++) {
> +		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
> +
> +		spin_lock(&irq->irq_lock);
> +
> +		irq->source &= ~((val >> (i * 8)) & 0xff);
> +		if (!irq->source)
> +			irq->pending = false;
> +
> +		spin_unlock(&irq->irq_lock);
> +	}
> +}
> +
> +static void vgic_mmio_write_sgipends(struct kvm_vcpu *vcpu,
> +				     gpa_t addr, unsigned int len,
> +				     unsigned long val)
> +{
> +	u32 intid = addr & 0x0f;
> +	int i;
> +
> +	for (i = 0; i < len; i++) {
> +		struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
> +
> +		spin_lock(&irq->irq_lock);
> +
> +		irq->source |= (val >> (i * 8)) & 0xff;
> +
> +		if (irq->source) {
> +			irq->pending = true;
> +			vgic_queue_irq_unlock(vcpu->kvm, irq);
> +		} else {
> +			spin_unlock(&irq->irq_lock);
> +		}
> +	}
> +}
> +
>  static const struct vgic_register_region vgic_v2_dist_registers[] = {
>  	REGISTER_DESC_WITH_LENGTH(GIC_DIST_CTRL,
>  		vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc, 12,
> @@ -184,10 +242,10 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = {
>  		vgic_mmio_read_raz, vgic_mmio_write_sgir, 4,
>  		VGIC_ACCESS_32bit),
>  	REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_CLEAR,
> -		vgic_mmio_read_raz, vgic_mmio_write_wi, 16,
> +		vgic_mmio_read_sgipend, vgic_mmio_write_sgipendc, 16,
>  		VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
>  	REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_SET,
> -		vgic_mmio_read_raz, vgic_mmio_write_wi, 16,
> +		vgic_mmio_read_sgipend, vgic_mmio_write_sgipends, 16,
>  		VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
>  };
>  
> -- 
> 2.8.2
> 
Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>