[PULL v2 4/6] spapr: Add /chosen to FDT only at reset time to preserve kernel and initramdisk

[Laurent Vivier <lvivier@redhat.com>]

From: Alexey Kardashevskiy <aik@ozlabs.ru>

Since "spapr: Render full FDT on ibm,client-architecture-support" we build
the entire flatten device tree (FDT) twice - at the reset time and
when "ibm,client-architecture-support" (CAS) is called. The full FDT from
CAS is then applied on top of the SLOF internal device tree.

This is mostly ok, however there is a case when the QEMU is started with
-initrd and for some reason the guest decided to move/unpack the init RAM
disk image - the guest correctly notifies SLOF about the change but
at CAS it is overridden with the QEMU initial location addresses and
the guest may fail to boot if the original initrd memory was changed.

This fixes the problem by only adding the /chosen node at the reset time
to prevent the original QEMU's linux,initrd-start/linux,initrd-end to
override the updated addresses.

This only treats /chosen differently as we know there is a special case
already and it is unlikely anything else will need to change /chosen at CAS
we are better off not touching /chosen after we handed it over to SLOF.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <20191024041308.5673-1-aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
---
 hw/ppc/spapr.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 94f9d27096af..e076f6023c73 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -917,7 +917,7 @@ static bool spapr_hotplugged_dev_before_cas(void)
     return false;
 }
 
-static void *spapr_build_fdt(SpaprMachineState *spapr);
+static void *spapr_build_fdt(SpaprMachineState *spapr, bool reset);
 
 int spapr_h_cas_compose_response(SpaprMachineState *spapr,
                                  target_ulong addr, target_ulong size,
@@ -939,7 +939,7 @@ int spapr_h_cas_compose_response(SpaprMachineState *spapr,
 
     size -= sizeof(hdr);
 
-    fdt = spapr_build_fdt(spapr);
+    fdt = spapr_build_fdt(spapr, false);
     _FDT((fdt_pack(fdt)));
 
     if (fdt_totalsize(fdt) + sizeof(hdr) > size) {
@@ -1197,7 +1197,7 @@ static void spapr_dt_hypervisor(SpaprMachineState *spapr, void *fdt)
     }
 }
 
-static void *spapr_build_fdt(SpaprMachineState *spapr)
+static void *spapr_build_fdt(SpaprMachineState *spapr, bool reset)
 {
     MachineState *machine = MACHINE(spapr);
     MachineClass *mc = MACHINE_GET_CLASS(machine);
@@ -1297,7 +1297,9 @@ static void *spapr_build_fdt(SpaprMachineState *spapr)
     spapr_dt_rtas(spapr, fdt);
 
     /* /chosen */
-    spapr_dt_chosen(spapr, fdt);
+    if (reset) {
+        spapr_dt_chosen(spapr, fdt);
+    }
 
     /* /hypervisor */
     if (kvm_enabled()) {
@@ -1305,11 +1307,14 @@ static void *spapr_build_fdt(SpaprMachineState *spapr)
     }
 
     /* Build memory reserve map */
-    if (spapr->kernel_size) {
-        _FDT((fdt_add_mem_rsv(fdt, KERNEL_LOAD_ADDR, spapr->kernel_size)));
-    }
-    if (spapr->initrd_size) {
-        _FDT((fdt_add_mem_rsv(fdt, spapr->initrd_base, spapr->initrd_size)));
+    if (reset) {
+        if (spapr->kernel_size) {
+            _FDT((fdt_add_mem_rsv(fdt, KERNEL_LOAD_ADDR, spapr->kernel_size)));
+        }
+        if (spapr->initrd_size) {
+            _FDT((fdt_add_mem_rsv(fdt, spapr->initrd_base,
+                                  spapr->initrd_size)));
+        }
     }
 
     /* ibm,client-architecture-support updates */
@@ -1718,7 +1723,7 @@ static void spapr_machine_reset(MachineState *machine)
      */
     fdt_addr = MIN(spapr->rma_size, RTAS_MAX_ADDR) - FDT_MAX_SIZE;
 
-    fdt = spapr_build_fdt(spapr);
+    fdt = spapr_build_fdt(spapr, true);
 
     rc = fdt_pack(fdt);
 
-- 
2.23.0