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From cb9d5380b1376b2a44d91d84eaf09f948ef1e165 Mon Sep 17 00:00:00 2001
From: Greg Kurz <gkurz@redhat.com>
Date: Tue, 19 Jan 2021 15:09:50 -0500
Subject: [PATCH 2/9] spapr: Fold h_cas_compose_response() into
 h_client_architecture_support()

RH-Author: Greg Kurz <gkurz@redhat.com>
Message-id: <20210119150954.1017058-3-gkurz@redhat.com>
Patchwork-id: 100687
O-Subject: [RHEL-8.4.0 qemu-kvm PATCH v2 2/6] spapr: Fold h_cas_compose_response() into h_client_architecture_support()
Bugzilla: 1901837
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: David Gibson <dgibson@redhat.com>

From: David Gibson <david@gibson.dropbear.id.au>

spapr_h_cas_compose_response() handles the last piece of the PAPR feature
negotiation process invoked via the ibm,client-architecture-support OF
call.  Its only caller is h_client_architecture_support() which handles
most of the rest of that process.

I believe it was placed in a separate file originally to handle some
fiddly dependencies between functions, but mostly it's just confusing
to have the CAS process split into two pieces like this.  Now that
compose response is simplified (by just generating the whole device
tree anew), it's cleaner to just fold it into
h_client_architecture_support().

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cedric Le Goater <clg@fr.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
(cherry picked from commit 0c21e073541cc093b4cb8744640e24f130e6f8ba)
Signed-off-by: Greg Kurz <gkurz@redhat.com>
Signed-off-by: Jon Maloy <jmaloy.redhat.com>
---
 hw/ppc/spapr.c         | 61 +-----------------------------------------
 hw/ppc/spapr_hcall.c   | 55 ++++++++++++++++++++++++++++++++++---
 include/hw/ppc/spapr.h |  4 +--
 3 files changed, 54 insertions(+), 66 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 92f63ad035..992bd08aaa 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -76,7 +76,6 @@
 #include "hw/nmi.h"
 #include "hw/intc/intc.h"
 
-#include "qemu/cutils.h"
 #include "hw/ppc/spapr_cpu_core.h"
 #include "hw/mem/memory-device.h"
 #include "hw/ppc/spapr_tpm_proxy.h"
@@ -898,63 +897,6 @@ out:
     return ret;
 }
 
-static bool spapr_hotplugged_dev_before_cas(void)
-{
-    Object *drc_container, *obj;
-    ObjectProperty *prop;
-    ObjectPropertyIterator iter;
-
-    drc_container = container_get(object_get_root(), "/dr-connector");
-    object_property_iter_init(&iter, drc_container);
-    while ((prop = object_property_iter_next(&iter))) {
-        if (!strstart(prop->type, "link<", NULL)) {
-            continue;
-        }
-        obj = object_property_get_link(drc_container, prop->name, NULL);
-        if (spapr_drc_needed(obj)) {
-            return true;
-        }
-    }
-    return false;
-}
-
-static void *spapr_build_fdt(SpaprMachineState *spapr, bool reset,
-                             size_t space);
-
-int spapr_h_cas_compose_response(SpaprMachineState *spapr,
-                                 target_ulong addr, target_ulong size,
-                                 SpaprOptionVector *ov5_updates)
-{
-    void *fdt;
-    SpaprDeviceTreeUpdateHeader hdr = { .version_id = 1 };
-
-    if (spapr_hotplugged_dev_before_cas()) {
-        return 1;
-    }
-
-    if (size < sizeof(hdr)) {
-        error_report("SLOF provided insufficient CAS buffer "
-                     TARGET_FMT_lu " (min: %zu)", size, sizeof(hdr));
-        exit(EXIT_FAILURE);
-    }
-
-    size -= sizeof(hdr);
-
-    fdt = spapr_build_fdt(spapr, false, size);
-    _FDT((fdt_pack(fdt)));
-
-    cpu_physical_memory_write(addr, &hdr, sizeof(hdr));
-    cpu_physical_memory_write(addr + sizeof(hdr), fdt, fdt_totalsize(fdt));
-    trace_spapr_cas_continue(fdt_totalsize(fdt) + sizeof(hdr));
-
-    g_free(spapr->fdt_blob);
-    spapr->fdt_size = fdt_totalsize(fdt);
-    spapr->fdt_initial_size = spapr->fdt_size;
-    spapr->fdt_blob = fdt;
-
-    return 0;
-}
-
 static void spapr_dt_rtas(SpaprMachineState *spapr, void *fdt)
 {
     MachineState *ms = MACHINE(spapr);
@@ -1192,8 +1134,7 @@ static void spapr_dt_hypervisor(SpaprMachineState *spapr, void *fdt)
     }
 }
 
-static void *spapr_build_fdt(SpaprMachineState *spapr, bool reset,
-                             size_t space)
+void *spapr_build_fdt(SpaprMachineState *spapr, bool reset, size_t space)
 {
     MachineState *machine = MACHINE(spapr);
     MachineClass *mc = MACHINE_GET_CLASS(machine);
diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 05a7ca275b..0f19be794c 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1,4 +1,5 @@
 #include "qemu/osdep.h"
+#include "qemu/cutils.h"
 #include "qapi/error.h"
 #include "sysemu/hw_accel.h"
 #include "sysemu/runstate.h"
@@ -15,6 +16,7 @@
 #include "cpu-models.h"
 #include "trace.h"
 #include "kvm_ppc.h"
+#include "hw/ppc/fdt.h"
 #include "hw/ppc/spapr_ovec.h"
 #include "mmu-book3s-v3.h"
 #include "hw/mem/memory-device.h"
@@ -1638,6 +1640,26 @@ static uint32_t cas_check_pvr(SpaprMachineState *spapr, PowerPCCPU *cpu,
     return best_compat;
 }
 
+static bool spapr_hotplugged_dev_before_cas(void)
+{
+    Object *drc_container, *obj;
+    ObjectProperty *prop;
+    ObjectPropertyIterator iter;
+
+    drc_container = container_get(object_get_root(), "/dr-connector");
+    object_property_iter_init(&iter, drc_container);
+    while ((prop = object_property_iter_next(&iter))) {
+        if (!strstart(prop->type, "link<", NULL)) {
+            continue;
+        }
+        obj = object_property_get_link(drc_container, prop->name, NULL);
+        if (spapr_drc_needed(obj)) {
+            return true;
+        }
+    }
+    return false;
+}
+
 static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
                                                   SpaprMachineState *spapr,
                                                   target_ulong opcode,
@@ -1645,6 +1667,8 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
 {
     /* Working address in data buffer */
     target_ulong addr = ppc64_phys_to_real(args[0]);
+    target_ulong fdt_buf = args[1];
+    target_ulong fdt_bufsize = args[2];
     target_ulong ov_table;
     uint32_t cas_pvr;
     SpaprOptionVector *ov1_guest, *ov5_guest, *ov5_cas_old, *ov5_updates;
@@ -1788,16 +1812,41 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
 
     spapr_irq_update_active_intc(spapr);
 
+    if (spapr_hotplugged_dev_before_cas()) {
+        spapr->cas_reboot = true;
+    }
+
     if (!spapr->cas_reboot) {
+        void *fdt;
+        SpaprDeviceTreeUpdateHeader hdr = { .version_id = 1 };
+
         /* If spapr_machine_reset() did not set up a HPT but one is necessary
          * (because the guest isn't going to use radix) then set it up here. */
         if ((spapr->patb_entry & PATE1_GR) && !guest_radix) {
             /* legacy hash or new hash: */
             spapr_setup_hpt_and_vrma(spapr);
         }
-        spapr->cas_reboot =
-            (spapr_h_cas_compose_response(spapr, args[1], args[2],
-                                          ov5_updates) != 0);
+
+        if (fdt_bufsize < sizeof(hdr)) {
+            error_report("SLOF provided insufficient CAS buffer "
+                         TARGET_FMT_lu " (min: %zu)", fdt_bufsize, sizeof(hdr));
+            exit(EXIT_FAILURE);
+        }
+
+        fdt_bufsize -= sizeof(hdr);
+
+        fdt = spapr_build_fdt(spapr, false, fdt_bufsize);
+        _FDT((fdt_pack(fdt)));
+
+        cpu_physical_memory_write(fdt_buf, &hdr, sizeof(hdr));
+        cpu_physical_memory_write(fdt_buf + sizeof(hdr), fdt,
+                                  fdt_totalsize(fdt));
+        trace_spapr_cas_continue(fdt_totalsize(fdt) + sizeof(hdr));
+
+        g_free(spapr->fdt_blob);
+        spapr->fdt_size = fdt_totalsize(fdt);
+        spapr->fdt_initial_size = spapr->fdt_size;
+        spapr->fdt_blob = fdt;
     }
 
     spapr_ovec_cleanup(ov5_updates);
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index e047dabf30..e5e2a99046 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -767,11 +767,9 @@ struct SpaprEventLogEntry {
     QTAILQ_ENTRY(SpaprEventLogEntry) next;
 };
 
+void *spapr_build_fdt(SpaprMachineState *spapr, bool reset, size_t space);
 void spapr_events_init(SpaprMachineState *sm);
 void spapr_dt_events(SpaprMachineState *sm, void *fdt);
-int spapr_h_cas_compose_response(SpaprMachineState *sm,
-                                 target_ulong addr, target_ulong size,
-                                 SpaprOptionVector *ov5_updates);
 void close_htab_fd(SpaprMachineState *spapr);
 void spapr_setup_hpt_and_vrma(SpaprMachineState *spapr);
 void spapr_free_hpt(SpaprMachineState *spapr);
-- 
2.18.2