Re: [Xen-devel] [PATCH v8 17/27] ARM: vITS: handle MAPC command

[Julien Grall <julien.grall@xxxxxxx>]

On 12/04/17 01:44, Andre Przywara wrote:
> The MAPC command associates a given collection ID with a given
> redistributor, thus mapping collections to VCPUs.
> We just store the vcpu_id in the collection table for that.
>
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>

> ---
>  xen/arch/arm/vgic-v3-its.c | 41 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
>
> diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
> index eeb1306..6e505cb 100644
> --- a/xen/arch/arm/vgic-v3-its.c
> +++ b/xen/arch/arm/vgic-v3-its.c
> @@ -116,6 +116,21 @@ static paddr_t get_baser_phys_addr(uint64_t reg)
>  #define COLL_TABLE_ENTRY_SIZE 2UL
>
>  /* Must be called with the ITS lock held. */
> +static int its_set_collection(struct virt_its *its, uint16_t collid,
> +                              uint16_t vcpu_id)
> +{
> +    paddr_t addr = get_baser_phys_addr(its->baser_coll);
> +
> +    ASSERT(spin_is_locked(&its->its_lock));
> +
> +    if ( collid >= its->max_collections )
> +        return -ENOENT;
> +
> +    return vgic_access_guest_memory(its->d, addr + collid * sizeof(uint16_t),
> +                                    &vcpu_id, sizeof(vcpu_id), true);
> +}
> +
> +/* Must be called with the ITS lock held. */
>  static struct vcpu *get_vcpu_from_collection(struct virt_its *its,
>                                               uint16_t collid)
>  {
> @@ -360,6 +375,29 @@ static int its_handle_int(struct virt_its *its, uint64_t 
> *cmdptr)
>      return 0;
>  }
>
> +static int its_handle_mapc(struct virt_its *its, uint64_t *cmdptr)
> +{
> +    uint32_t collid = its_cmd_get_collection(cmdptr);
> +    uint64_t rdbase = its_cmd_mask_field(cmdptr, 2, 16, 44);
> +
> +    if ( collid >= its->max_collections )
> +        return -1;
> +
> +    if ( rdbase >= its->d->max_vcpus )
> +        return -1;
> +
> +    spin_lock(&its->its_lock);
> +
> +    if ( its_cmd_get_validbit(cmdptr) )
> +        its_set_collection(its, collid, rdbase);
> +    else
> +        its_set_collection(its, collid, UNMAPPED_COLLECTION);
> +
> +    spin_unlock(&its->its_lock);
> +
> +    return 0;
> +}
> +
>  #define ITS_CMD_BUFFER_SIZE(baser)      ((((baser) & 0xff) + 1) << 12)
>  #define ITS_CMD_OFFSET(reg)             ((reg) & GENMASK(19, 5))
>
> @@ -395,6 +433,9 @@ static int vgic_its_handle_cmds(struct domain *d, struct 
> virt_its *its)
>          case GITS_CMD_INT:
>              ret = its_handle_int(its, command);
>              break;
> +        case GITS_CMD_MAPC:
> +            ret = its_handle_mapc(its, command);
> +            break;
>          case GITS_CMD_SYNC:
>              /* We handle ITS commands synchronously, so we ignore SYNC. */
>              break;
--
Julien Grall

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