PPC: mpc8544ds: Add hypervisor node

When running a PPC guest with KVM that can do PV operations, we need
to indicate the guest which instructions to use for a hypercall and
that it is running as KVM guest.

This logic was available on openbios based machines already. This patch
also adds said functionality to the mpc8544ds machine.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Acked-by: NScott Wood <scottwood@freescale.com>

hw/ppce500_mpc8544ds.c

@@ -82,11 +82,12 @@ out:
 }
 #endif
 
-static int mpc8544_load_device_tree(target_phys_addr_t addr,
-                                     uint32_t ramsize,
-                                     target_phys_addr_t initrd_base,
-                                     target_phys_addr_t initrd_size,
-                                     const char *kernel_cmdline)
+static int mpc8544_load_device_tree(CPUState *env,
+                                    target_phys_addr_t addr,
+                                    uint32_t ramsize,
+                                    target_phys_addr_t initrd_base,
+                                    target_phys_addr_t initrd_size,
+                                    const char *kernel_cmdline)
 {
     int ret = -1;
 #ifdef CONFIG_FDT
@@ -94,6 +95,7 @@ static int mpc8544_load_device_tree(target_phys_addr_t addr,
     char *filename;
     int fdt_size;
     void *fdt;
+    uint8_t hypercall[16];
 
     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, BINARY_DEVICE_TREE_FILE);
     if (!filename) {
@@ -157,6 +159,13 @@ static int mpc8544_load_device_tree(target_phys_addr_t addr,
 
         mpc8544_copy_soc_cell(fdt, buf, "clock-frequency");
         mpc8544_copy_soc_cell(fdt, buf, "timebase-frequency");
+
+        /* indicate KVM hypercall interface */
+        qemu_devtree_setprop_string(fdt, "/hypervisor", "compatible",
+                                    "linux,kvm");
+        kvmppc_get_hypercall(env, hypercall, sizeof(hypercall));
+        qemu_devtree_setprop(fdt, "/hypervisor", "hcall-instructions",
+                             hypercall, sizeof(hypercall));
     } else {
         const uint32_t freq = 400000000;
 
@@ -330,7 +339,7 @@ static void mpc8544ds_init(ram_addr_t ram_size,
         cpu_abort(env, "Compiled without FDT support - can't load kernel\n");
 #endif
         dt_base = (kernel_size + DTC_LOAD_PAD) & ~DTC_PAD_MASK;
-        if (mpc8544_load_device_tree(dt_base, ram_size,
+        if (mpc8544_load_device_tree(env, dt_base, ram_size,
                     initrd_base, initrd_size, kernel_cmdline) < 0) {
             fprintf(stderr, "couldn't load device tree\n");
             exit(1);

pc-bios/mpc8544ds.dts

@@ -125,4 +125,7 @@
 	chosen {
 		linux,stdout-path = "/soc8544@e0000000/serial@4500";
 	};
+
+	hypervisor {
+	};
 };