Add support for Xen boot-time cpupools

Introduce support for creating boot-time cpupools in the device tree and
assigning them to dom0less domUs. Add the following options:
 - CPUPOOL[number]="cpu@1,...,cpu@N scheduler" to specify the
   list of cpus' node names and the scheduler to be used to create cpupool
 - NUM_CPUPOOLS to specify the number of cpupools to create
 - DOMU_CPUPOOL[number]="<id>" to specify the id of the cpupool to
   assign to domU

Example usage:
CPUPOOL[0]="cpu@1,cpu@2 null"
DOMU_CPUPOOL[0]=0
NUM_CPUPOOLS=1

The above example will create a boot-time cpupool (id=0) with 2 cpus:
cpu@1, cpu@2 and the null scheduler. It will assign the cpupool with
id=0 to domU0.

Signed-off-by: Michal Orzel <michal.orzel@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/README.md b/README.md
index bd9dac9..0418183 100644
--- a/README.md
+++ b/README.md
@@ -181,6 +181,9 @@ Where:
   present. If set to 1, the VM can use PV drivers. Older Linux kernels
   might break.
 
+- DOMU_CPUPOOL[number] specifies the id of the cpupool (created using
+  CPUPOOL[number] option, where number == id) that will be assigned to domU.
+
 - LINUX is optional but specifies the Linux kernel for when Xen is NOT
   used.  To enable this set any LINUX\_\* variables and do NOT set the
   XEN variable.
@@ -223,6 +226,13 @@ Where:
   include the public key in.  This can only be used with
   FIT_ENC_KEY_DIR.  See the -u option below for more information.
 
+- CPUPOOL[number]="cpu@1,...,cpu@N scheduler"
+  specifies the list of cpus' node names (separated by commas) and the scheduler
+  to be used to create boot-time cpupool. If no scheduler is set, the Xen
+  default one will be used.
+
+- NUM_CPUPOOLS specifies the number of boot-time cpupools to create.
+
 Then you can invoke uboot-script-gen as follows:
 
 ```