PPC: e500: Support dynamically spawned sysbus devices

For e500 our approach to supporting dynamically spawned sysbus devices is to
create a simple bus from the guest's point of view within which we map those
devices dynamically.

We allocate memory regions always within the "platform" hole in address
space and map IRQs to predetermined IRQ lines that are reserved for platform
device usage.

This maps really nicely into device tree logic, so we can just tell the
guest about our virtual simple bus in device tree as well.

Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/hw/ppc/e500plat.c b/hw/ppc/e500plat.c
index bafb56d9ff..d50ae000ee 100644
--- a/hw/ppc/e500plat.c
+++ b/hw/ppc/e500plat.c
@@ -36,6 +36,11 @@ static void e500plat_init(MachineState *machine)
         .fixup_devtree = e500plat_fixup_devtree,
         .mpic_version = OPENPIC_MODEL_FSL_MPIC_42,
         .has_mpc8xxx_gpio = true,
+        .has_platform_bus = true,
+        .platform_bus_base = 0xf00000000ULL,
+        .platform_bus_size = (128ULL * 1024 * 1024),
+        .platform_bus_first_irq = 5,
+        .platform_bus_num_irqs = 10,
     };
 
     /* Older KVM versions don't support EPR which breaks guests when we announce
@@ -52,6 +57,7 @@ static QEMUMachine e500plat_machine = {
     .desc = "generic paravirt e500 platform",
     .init = e500plat_init,
     .max_cpus = 32,
+    .has_dynamic_sysbus = true,
 };
 
 static void e500plat_machine_init(void)