Re: [Xen-devel] [PATCH v3 25/39] ARM: new VGIC: Add SGIR register handler

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 21 Mar 2018, Andre Przywara wrote:
> Triggering an IPI via this register is v2 specific, so the
> implementation lives entirely in vgic-mmio-v2.c.
> 
> This is based on Linux commit 55cc01fb9004, written by Andre Przywara.
> 
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx>

Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
> Changelog v2 ... v3:
> - fix target mask calculation
> 
> Changelog v1 ... v2:
> - remove stray rebase artefact
> 
>  xen/arch/arm/vgic/vgic-mmio-v2.c | 45 
> +++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 44 insertions(+), 1 deletion(-)
> 
> diff --git a/xen/arch/arm/vgic/vgic-mmio-v2.c 
> b/xen/arch/arm/vgic/vgic-mmio-v2.c
> index b333de9ed7..9ef80608c1 100644
> --- a/xen/arch/arm/vgic/vgic-mmio-v2.c
> +++ b/xen/arch/arm/vgic/vgic-mmio-v2.c
> @@ -81,6 +81,49 @@ static void vgic_mmio_write_v2_misc(struct vcpu *vcpu,
>      }
>  }
>  
> +static void vgic_mmio_write_sgir(struct vcpu *source_vcpu,
> +                                 paddr_t addr, unsigned int len,
> +                                 unsigned long val)
> +{
> +    struct domain *d = source_vcpu->domain;
> +    unsigned int nr_vcpus = d->max_vcpus;
> +    unsigned int intid = val & GICD_SGI_INTID_MASK;
> +    unsigned long targets = (val & GICD_SGI_TARGET_MASK) >>
> +                            GICD_SGI_TARGET_SHIFT;
> +    unsigned int vcpu_id;
> +
> +    switch ( val & GICD_SGI_TARGET_LIST_MASK )
> +    {
> +    case GICD_SGI_TARGET_LIST:                    /* as specified by targets 
> */
> +        targets &= GENMASK(nr_vcpus - 1, 0);      /* limit to existing VCPUs 
> */
> +        break;
> +    case GICD_SGI_TARGET_OTHERS:
> +        targets = GENMASK(nr_vcpus - 1, 0);       /* all, ...   */
> +        targets &= ~(1U << source_vcpu->vcpu_id); /*   but self */
> +        break;
> +    case GICD_SGI_TARGET_SELF:                    /* this very vCPU only */
> +        targets = (1U << source_vcpu->vcpu_id);
> +        break;
> +    case 0x3:                                     /* reserved */
> +        return;
> +    }
> +
> +    for_each_set_bit( vcpu_id, &targets, 8 )
> +    {
> +        struct vcpu *vcpu = d->vcpu[vcpu_id];
> +        struct vgic_irq *irq = vgic_get_irq(d, vcpu, intid);
> +        unsigned long flags;
> +
> +        spin_lock_irqsave(&irq->irq_lock, flags);
> +
> +        irq->pending_latch = true;
> +        irq->source |= 1U << source_vcpu->vcpu_id;
> +
> +        vgic_queue_irq_unlock(d, irq, flags);
> +        vgic_put_irq(d, irq);
> +    }
> +}
> +
>  static unsigned long vgic_mmio_read_target(struct vcpu *vcpu,
>                                             paddr_t addr, unsigned int len)
>  {
> @@ -173,7 +216,7 @@ static const struct vgic_register_region 
> vgic_v2_dist_registers[] = {
>          vgic_mmio_read_config, vgic_mmio_write_config, 2,
>          VGIC_ACCESS_32bit),
>      REGISTER_DESC_WITH_LENGTH(GICD_SGIR,
> -        vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
> +        vgic_mmio_read_raz, vgic_mmio_write_sgir, 4,
>          VGIC_ACCESS_32bit),
>      REGISTER_DESC_WITH_LENGTH(GICD_CPENDSGIR,
>          vgic_mmio_read_raz, vgic_mmio_write_wi, 16,
> -- 
> 2.14.1
> 

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