Hi Eric, On Tue, Mar 27, 2018 at 04:04:06PM +0200, Eric Auger wrote: > 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@xxxxxxxxxx> > --- > Documentation/virtual/kvm/devices/arm-vgic-v3.txt | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) > > diff --git a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt > index 9293b45..0ded904 100644 > --- a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt > +++ b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt > @@ -27,6 +27,24 @@ 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 .... 16 | 15 - 12 |11 - 0 > + values: | count | base | flags | index > + - index encodes the unique redistributor region index > + - flags: reserved for future use, currently 0 > + - base field encodes bits [51:16] of 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 should this be two 64K pages for the number of redistributors in this region as specified by count ? > + within the redistributor region. > + - count encodes the number of redistributors in the region. I assume it's implied that the user must register a total number of redistributors across all the regions that matches the number of vcpus, and that otherwise something bad happens? > + Only valid for KVM_DEV_TYPE_ARM_VGIC_V3. > + > + It is invalid to mix calls with KVM_VGIC_V3_ADDR_TYPE_REDIST and > + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attributes. When attempted an > + -EINVAL error is returned. > + > Errors: > -E2BIG: Address outside of addressable IPA range > -EINVAL: Incorrectly aligned address > -- > 2.5.5 > Thanks, -Christoffer _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
