[Qemu-devel] [PATCH] PPC: mpc8544ds: Add hypervisor node

[Alexander Graf <agraf@suse.de>]

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: Alexander Graf <agraf@suse.de>
---
 hw/ppce500_mpc8544ds.c |   21 +++++++++++++++------
 pc-bios/mpc8544ds.dtb  |  Bin 2257 -> 2277 bytes
 pc-bios/mpc8544ds.dts  |    3 +++
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/hw/ppce500_mpc8544ds.c b/hw/ppce500_mpc8544ds.c
index 3ba8e75..073de3c 100644
--- a/hw/ppce500_mpc8544ds.c
+++ b/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);
diff --git a/pc-bios/mpc8544ds.dtb b/pc-bios/mpc8544ds.dtb
index 189224e5875e9dd0d9195c22624b85bfb29dd820..ae318b1fe83846cc2e133951a3666fcfcdf87f79 100644
GIT binary patch
delta 47
zcmca8_*78f0`I@K3=AAk85kHW7#P?qCJKl%I&9Q1XXj?js4Pe=D$6X+FWMZ&Ud;#q
DUc3%i

delta 35
rcmaDVcu`Q`0`I@K3=A9>85kHW7#P@7CJKl%>TJ|7XWv}RUc?9h$W95#

diff --git a/pc-bios/mpc8544ds.dts b/pc-bios/mpc8544ds.dts
index fd792d5..a88b47c 100644
--- a/pc-bios/mpc8544ds.dts
+++ b/pc-bios/mpc8544ds.dts
@@ -125,4 +125,7 @@
 	chosen {
 		linux,stdout-path = "/soc8544@e0000000/serial@4500";
 	};
+
+	hypervisor {
+	};
 };
-- 
1.6.0.2