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    Subject[RFC 02/12] KVM: arm/arm64: Document KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION
    Date
    We introduce a new KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attribute in
    KVM_DEV_ARM_VGIC_GRP_ADDR group. It allows userspace to provide the
    base address and size of a redistributor region

    Compared to KVM_VGIC_V3_ADDR_TYPE_REDIST, this new attribute allows
    to declare several separate redistributor regions.

    So the whole redist space does not need to be contiguous anymore.

    Signed-off-by: Eric Auger <eric.auger@redhat.com>
    ---
    Documentation/virtual/kvm/devices/arm-vgic-v3.txt | 12 ++++++++++++
    1 file changed, 12 insertions(+)

    diff --git a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
    index 9293b45..2c0bedf 100644
    --- a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
    +++ b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt
    @@ -27,6 +27,18 @@ Groups:
    VCPU and all of the redistributor pages are contiguous.
    Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
    This address needs to be 64K aligned.
    +
    + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION (rw, 64-bit)
    + The attr field of kvm_device_attr encodes 3 values:
    + bits: | 63 .... 52 | 51 .... 12 |11 - 0
    + values: | pfns | base | index
    + - index encodes the unique redistibutor region index
    + - base field encodes bits [51:12] the guest physical base address
    + of the first redistributor in the region. There are two 64K pages
    + for each VCPU and all of the redistributor pages are contiguous
    + within the redistributor region.
    + - pfns encodes the size of the region in 64kB pages.
    + Only valid for KVM_DEV_TYPE_ARM_VGIC_V3.
    Errors:
    -E2BIG: Address outside of addressable IPA range
    -EINVAL: Incorrectly aligned address
    --
    2.5.5
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