target-ppc: Add mechanism for synchronizing SPRs with KVM

Currently when runing under KVM on ppc, we synchronize a certain number of
vital SPRs to KVM through the SET_SREGS call.  This leaves out quite a lot
of important SPRs which are maintained in KVM.  It would be helpful to
have their contents in qemu for debugging purposes, and when we implement
migration it will be vital, since they include important guest state that
will need to be restored on the target.

This patch sets up for synchronization of any registers supported by the
KVM ONE_REG calls.  A new variant on spr_register() allows a ONE_REG id to
be stored with the SPR information.  When we set/get information to KVM
we also synchronize any SPRs so registered.

For now we set this mechanism up to synchronize a handful of important
registers that already have ONE_REG IDs, notably the DAR and DSISR.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 65 insertions, 49 deletions

diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 1015077..7fb314c 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -572,26 +572,42 @@ static inline void vscr_init (CPUPPCState *env, uint32_t val)
     set_flush_to_zero(vscr_nj, &env->vec_status);
 }
 
-#if defined(CONFIG_USER_ONLY)
-#define spr_register(env, num, name, uea_read, uea_write,                     \
-                     oea_read, oea_write, initial_value)                      \
-do {                                                                          \
-     _spr_register(env, num, name, uea_read, uea_write, initial_value);       \
-} while (0)
-static inline void _spr_register (CPUPPCState *env, int num,
-                                  const char *name,
-                                  void (*uea_read)(void *opaque, int gprn, int sprn),
-                                  void (*uea_write)(void *opaque, int sprn, int gprn),
-                                  target_ulong initial_value)
+#ifdef CONFIG_USER_ONLY
+#define spr_register_kvm(env, num, name, uea_read, uea_write,                  \
+                         oea_read, oea_write, one_reg_id, initial_value)       \
+    _spr_register(env, num, name, uea_read, uea_write, initial_value)
+#else
+#if !defined(CONFIG_KVM)
+#define spr_register_kvm(env, num, name, uea_read, uea_write,                  \
+                         oea_read, oea_write, one_reg_id, initial_value) \
+    _spr_register(env, num, name, uea_read, uea_write,                         \
+                  oea_read, oea_write, initial_value)
 #else
-static inline void spr_register (CPUPPCState *env, int num,
+#define spr_register_kvm(env, num, name, uea_read, uea_write,                  \
+                         oea_read, oea_write, one_reg_id, initial_value) \
+    _spr_register(env, num, name, uea_read, uea_write,                         \
+                  oea_read, oea_write, one_reg_id, initial_value)
+#endif
+#endif
+
+#define spr_register(env, num, name, uea_read, uea_write,                      \
+                     oea_read, oea_write, initial_value)                       \
+    spr_register_kvm(env, num, name, uea_read, uea_write,                      \
+                     oea_read, oea_write, 0, initial_value)
+
+static inline void _spr_register(CPUPPCState *env, int num,
                                  const char *name,
                                  void (*uea_read)(void *opaque, int gprn, int sprn),
                                  void (*uea_write)(void *opaque, int sprn, int gprn),
+#if !defined(CONFIG_USER_ONLY)
+
                                  void (*oea_read)(void *opaque, int gprn, int sprn),
                                  void (*oea_write)(void *opaque, int sprn, int gprn),
-                                 target_ulong initial_value)
 #endif
+#if defined(CONFIG_KVM)
+                                 uint64_t one_reg_id,
+#endif
+                                 target_ulong initial_value)
 {
     ppc_spr_t *spr;
 
@@ -667,14 +683,14 @@ static void gen_spr_generic (CPUPPCState *env)
 static void gen_spr_ne_601 (CPUPPCState *env)
 {
     /* Exception processing */
-    spr_register(env, SPR_DSISR, "DSISR",
-                 SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
-                 0x00000000);
-    spr_register(env, SPR_DAR, "DAR",
-                 SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
-                 0x00000000);
+    spr_register_kvm(env, SPR_DSISR, "DSISR",
+                     SPR_NOACCESS, SPR_NOACCESS,
+                     &spr_read_generic, &spr_write_generic,
+                     KVM_REG_PPC_DSISR, 0x00000000);
+    spr_register_kvm(env, SPR_DAR, "DAR",
+                     SPR_NOACCESS, SPR_NOACCESS,
+                     &spr_read_generic, &spr_write_generic,
+                     KVM_REG_PPC_DAR, 0x00000000);
     /* Timer */
     spr_register(env, SPR_DECR, "DECR",
                  SPR_NOACCESS, SPR_NOACCESS,
@@ -918,10 +934,10 @@ static void gen_spr_7xx (CPUPPCState *env)
 {
     /* Breakpoints */
     /* XXX : not implemented */
-    spr_register(env, SPR_DABR, "DABR",
-                 SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
-                 0x00000000);
+    spr_register_kvm(env, SPR_DABR, "DABR",
+                     SPR_NOACCESS, SPR_NOACCESS,
+                     &spr_read_generic, &spr_write_generic,
+                     KVM_REG_PPC_DABR, 0x00000000);
     /* XXX : not implemented */
     spr_register(env, SPR_IABR, "IABR",
                  SPR_NOACCESS, SPR_NOACCESS,
@@ -1047,10 +1063,10 @@ static void gen_spr_604 (CPUPPCState *env)
                  &spr_read_generic, &spr_write_generic,
                  0x00000000);
     /* XXX : not implemented */
-    spr_register(env, SPR_DABR, "DABR",
-                 SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
-                 0x00000000);
+    spr_register_kvm(env, SPR_DABR, "DABR",
+                     SPR_NOACCESS, SPR_NOACCESS,
+                     &spr_read_generic, &spr_write_generic,
+                     KVM_REG_PPC_DABR, 0x00000000);
     /* Performance counters */
     /* XXX : not implemented */
     spr_register(env, SPR_MMCR0, "MMCR0",
@@ -2305,14 +2321,14 @@ static void gen_spr_620 (CPUPPCState *env)
 static void gen_spr_5xx_8xx (CPUPPCState *env)
 {
     /* Exception processing */
-    spr_register(env, SPR_DSISR, "DSISR",
-                 SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
-                 0x00000000);
-    spr_register(env, SPR_DAR, "DAR",
-                 SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
-                 0x00000000);
+    spr_register_kvm(env, SPR_DSISR, "DSISR",
+                     SPR_NOACCESS, SPR_NOACCESS,
+                     &spr_read_generic, &spr_write_generic,
+                     KVM_REG_PPC_DSISR, 0x00000000);
+    spr_register_kvm(env, SPR_DAR, "DAR",
+                     SPR_NOACCESS, SPR_NOACCESS,
+                     &spr_read_generic, &spr_write_generic,
+                     KVM_REG_PPC_DAR, 0x00000000);
     /* Timer */
     spr_register(env, SPR_DECR, "DECR",
                  SPR_NOACCESS, SPR_NOACCESS,
@@ -7036,22 +7052,22 @@ static void init_proc_POWER7 (CPUPPCState *env)
                  0x00000000);
 #if !defined(CONFIG_USER_ONLY)
     /* PURR & SPURR: Hack - treat these as aliases for the TB for now */
-    spr_register(env, SPR_PURR,   "PURR",
-                 &spr_read_purr, SPR_NOACCESS,
-                 &spr_read_purr, SPR_NOACCESS,
-                 0x00000000);
-    spr_register(env, SPR_SPURR,   "SPURR",
-                 &spr_read_purr, SPR_NOACCESS,
-                 &spr_read_purr, SPR_NOACCESS,
-                 0x00000000);
+    spr_register_kvm(env, SPR_PURR,   "PURR",
+                     &spr_read_purr, SPR_NOACCESS,
+                     &spr_read_purr, SPR_NOACCESS,
+                     KVM_REG_PPC_PURR, 0x00000000);
+    spr_register_kvm(env, SPR_SPURR,   "SPURR",
+                     &spr_read_purr, SPR_NOACCESS,
+                     &spr_read_purr, SPR_NOACCESS,
+                     KVM_REG_PPC_SPURR, 0x00000000);
     spr_register(env, SPR_CFAR, "SPR_CFAR",
                  SPR_NOACCESS, SPR_NOACCESS,
                  &spr_read_cfar, &spr_write_cfar,
                  0x00000000);
-    spr_register(env, SPR_DSCR, "SPR_DSCR",
-                 SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
-                 0x00000000);
+    spr_register_kvm(env, SPR_DSCR, "SPR_DSCR",
+                     SPR_NOACCESS, SPR_NOACCESS,
+                     &spr_read_generic, &spr_write_generic,
+                     KVM_REG_PPC_DSCR, 0x00000000);
 #endif /* !CONFIG_USER_ONLY */
     /* Memory management */
     /* XXX : not implemented */