pseries: Add H_SET_MODE hcall to change guest exception endianness

H_SET_MODE is used for controlling various partition settings. One
of these settings is the endianness a guest takes its exceptions in.

Signed-off-by: Anton Blanchard <anton@samba.org>
[agraf: fix whitespace]
Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 51 insertions, 1 deletions

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 1ce9b0b040..04f0ee3da1 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -282,7 +282,7 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
     uint32_t start_prop = cpu_to_be32(initrd_base);
     uint32_t end_prop = cpu_to_be32(initrd_base + initrd_size);
     char hypertas_prop[] = "hcall-pft\0hcall-term\0hcall-dabr\0hcall-interrupt"
-        "\0hcall-tce\0hcall-vio\0hcall-splpar\0hcall-bulk";
+        "\0hcall-tce\0hcall-vio\0hcall-splpar\0hcall-bulk\0hcall-set-mode";
     char qemu_hypertas_prop[] = "hcall-memop1";
     uint32_t refpoints[] = {cpu_to_be32(0x4), cpu_to_be32(0x4)};
     uint32_t interrupt_server_ranges_prop[] = {0, cpu_to_be32(smp_cpus)};
diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 67d6cd91d1..89e6a00dd9 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -657,6 +657,54 @@ static target_ulong h_logical_dcbf(PowerPCCPU *cpu, sPAPREnvironment *spapr,
     return H_SUCCESS;
 }
 
+static target_ulong h_set_mode(PowerPCCPU *cpu, sPAPREnvironment *spapr,
+                               target_ulong opcode, target_ulong *args)
+{
+    CPUState *cs;
+    target_ulong mflags = args[0];
+    target_ulong resource = args[1];
+    target_ulong value1 = args[2];
+    target_ulong value2 = args[3];
+    target_ulong ret = H_P2;
+
+    if (resource == H_SET_MODE_ENDIAN) {
+        if (value1) {
+            ret = H_P3;
+            goto out;
+        }
+        if (value2) {
+            ret = H_P4;
+            goto out;
+        }
+
+        switch (mflags) {
+        case H_SET_MODE_ENDIAN_BIG:
+            for (cs = first_cpu; cs != NULL; cs = cs->next_cpu) {
+                PowerPCCPU *cp = POWERPC_CPU(cs);
+                CPUPPCState *env = &cp->env;
+                env->spr[SPR_LPCR] &= ~LPCR_ILE;
+            }
+            ret = H_SUCCESS;
+            break;
+
+        case H_SET_MODE_ENDIAN_LITTLE:
+            for (cs = first_cpu; cs != NULL; cs = cs->next_cpu) {
+                PowerPCCPU *cp = POWERPC_CPU(cs);
+                CPUPPCState *env = &cp->env;
+                env->spr[SPR_LPCR] |= LPCR_ILE;
+            }
+            ret = H_SUCCESS;
+            break;
+
+        default:
+            ret = H_UNSUPPORTED_FLAG;
+        }
+    }
+
+out:
+    return ret;
+}
+
 static spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
 static spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX - KVMPPC_HCALL_BASE + 1];
 
@@ -734,6 +782,8 @@ static void hypercall_register_types(void)
 
     /* qemu/KVM-PPC specific hcalls */
     spapr_register_hypercall(KVMPPC_H_RTAS, h_rtas);
+
+    spapr_register_hypercall(H_SET_MODE, h_set_mode);
 }
 
 type_init(hypercall_register_types)