spapr: Fix implementation of Open Firmware client interface

This addresses the comments from v22.

The functional changes are (the VOF ones need retesting with Pegasos2):

(VOF) setprop will start failing if the machine class callback
did not handle it;
(VOF) unit addresses are lowered in path_offset();
(SPAPR) /chosen/bootargs is initialized from kernel_cmdline if
the client did not change it.

Fixes: 5c991e5d4378 ("spapr: Implement Open Firmware client interface")
Cc: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <20210708065625.548396-1-aik@ozlabs.ru>
Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 23 insertions, 9 deletions

diff --git a/hw/ppc/spapr_vof.c b/hw/ppc/spapr_vof.c
index 131a03fec0..40ce8fe003 100644
--- a/hw/ppc/spapr_vof.c
+++ b/hw/ppc/spapr_vof.c
@@ -8,6 +8,7 @@
 #include "qapi/error.h"
 #include "hw/ppc/spapr.h"
 #include "hw/ppc/spapr_vio.h"
+#include "hw/ppc/spapr_cpu_core.h"
 #include "hw/ppc/fdt.h"
 #include "hw/ppc/vof.h"
 #include "sysemu/sysemu.h"
@@ -29,13 +30,19 @@ target_ulong spapr_h_vof_client(PowerPCCPU *cpu, SpaprMachineState *spapr,
 void spapr_vof_client_dt_finalize(SpaprMachineState *spapr, void *fdt)
 {
     char *stdout_path = spapr_vio_stdout_path(spapr->vio_bus);
-    int chosen;
 
     vof_build_dt(fdt, spapr->vof);
 
-    _FDT(chosen = fdt_path_offset(fdt, "/chosen"));
-    _FDT(fdt_setprop_string(fdt, chosen, "bootargs",
-                            spapr->vof->bootargs ? : ""));
+    if (spapr->vof->bootargs) {
+        int chosen;
+
+        _FDT(chosen = fdt_path_offset(fdt, "/chosen"));
+        /*
+         * If the client did not change "bootargs", spapr_dt_chosen() must have
+         * stored machine->kernel_cmdline in it before getting here.
+         */
+        _FDT(fdt_setprop_string(fdt, chosen, "bootargs", spapr->vof->bootargs));
+    }
 
     /*
      * SLOF-less setup requires an open instance of stdout for early
@@ -48,20 +55,21 @@ void spapr_vof_client_dt_finalize(SpaprMachineState *spapr, void *fdt)
     }
 }
 
-void spapr_vof_reset(SpaprMachineState *spapr, void *fdt,
-                     target_ulong *stack_ptr, Error **errp)
+void spapr_vof_reset(SpaprMachineState *spapr, void *fdt, Error **errp)
 {
+    target_ulong stack_ptr;
     Vof *vof = spapr->vof;
+    PowerPCCPU *first_ppc_cpu = POWERPC_CPU(first_cpu);
 
     vof_init(vof, spapr->rma_size, errp);
 
-    *stack_ptr = vof_claim(vof, 0, VOF_STACK_SIZE, VOF_STACK_SIZE);
-    if (*stack_ptr == -1) {
+    stack_ptr = vof_claim(vof, 0, VOF_STACK_SIZE, VOF_STACK_SIZE);
+    if (stack_ptr == -1) {
         error_setg(errp, "Memory allocation for stack failed");
         return;
     }
     /* Stack grows downwards plus reserve space for the minimum stack frame */
-    *stack_ptr += VOF_STACK_SIZE - 0x20;
+    stack_ptr += VOF_STACK_SIZE - 0x20;
 
     if (spapr->kernel_size &&
         vof_claim(vof, spapr->kernel_addr, spapr->kernel_size, 0) == -1) {
@@ -77,6 +85,12 @@ void spapr_vof_reset(SpaprMachineState *spapr, void *fdt,
 
     spapr_vof_client_dt_finalize(spapr, fdt);
 
+    spapr_cpu_set_entry_state(first_ppc_cpu, SPAPR_ENTRY_POINT,
+                              stack_ptr, spapr->initrd_base,
+                              spapr->initrd_size);
+    /* VOF is 32bit BE so enforce MSR here */
+    first_ppc_cpu->env.msr &= ~((1ULL << MSR_SF) | (1ULL << MSR_LE));
+
     /*
      * At this point the expected allocation map is:
      *