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Diffstat (limited to 'Documentation/virt/kvm/devices/arm-vgic-its.rst')
| -rw-r--r-- | Documentation/virt/kvm/devices/arm-vgic-its.rst | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/Documentation/virt/kvm/devices/arm-vgic-its.rst b/Documentation/virt/kvm/devices/arm-vgic-its.rst index d257eddbae29..0f971f83205a 100644 --- a/Documentation/virt/kvm/devices/arm-vgic-its.rst +++ b/Documentation/virt/kvm/devices/arm-vgic-its.rst @@ -52,7 +52,10 @@ KVM_DEV_ARM_VGIC_GRP_CTRL KVM_DEV_ARM_ITS_SAVE_TABLES save the ITS table data into guest RAM, at the location provisioned - by the guest in corresponding registers/table entries. + by the guest in corresponding registers/table entries. Should userspace + require a form of dirty tracking to identify which pages are modified + by the saving process, it should use a bitmap even if using another + mechanism to track the memory dirtied by the vCPUs. The layout of the tables in guest memory defines an ABI. The entries are laid out in little endian format as described in the last paragraph. @@ -123,7 +126,8 @@ KVM_DEV_ARM_VGIC_GRP_ITS_REGS ITS Restore Sequence: --------------------- -The following ordering must be followed when restoring the GIC and the ITS: +The following ordering must be followed when restoring the GIC, ITS, and +KVM_IRQFD assignments: a) restore all guest memory and create vcpus b) restore all redistributors @@ -136,6 +140,8 @@ d) restore the ITS in the following order: 3. Load the ITS table data (KVM_DEV_ARM_ITS_RESTORE_TABLES) 4. Restore GITS_CTLR +e) restore KVM_IRQFD assignments for MSIs + Then vcpus can be started. ITS Table ABI REV0: |