target/ppc: Add Directed Privileged Door-bell Exception State (DPDES) SPR

DPDES stores a status of a doorbell message and if it is lost in
migration, the destination CPU won't receive it. This does not hit us
much as IPIs complete too quick to catch a pending one and even if
we missed one, broadcasts happen often enough to wake that CPU.

This defines DPDES and registers with KVM for migration.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <20190816061733.53572-1-aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 50245a8c4d932f870eab8151718aa03fa8823d43..4b35c8e4f4e8dfef03f1274fee0bc5cc295b26fb 100644 (file)
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1466,6 +1466,7 @@ typedef PowerPCCPU ArchCPU;
 #define SPR_MPC_ICTRL         (0x09E)
 #define SPR_MPC_BAR           (0x09F)
 #define SPR_PSPB              (0x09F)
+#define SPR_DPDES             (0x0B0)
 #define SPR_DAWR              (0x0B4)
 #define SPR_RPR               (0x0BA)
 #define SPR_CIABR             (0x0BB)

diff --git a/target/ppc/translate_init.inc.c b/target/ppc/translate_init.inc.c
index c9fcd87095f513e1bccc63a9eb9041283f477e91..7e41ae145600d58aa8e70cea540424680a951a54 100644 (file)
--- a/target/ppc/translate_init.inc.c
+++ b/target/ppc/translate_init.inc.c
@@ -8198,6 +8198,18 @@ static void gen_spr_power8_pspb(CPUPPCState *env)
                      KVM_REG_PPC_PSPB, 0);
 }
 
+static void gen_spr_power8_dpdes(CPUPPCState *env)
+{
+#if !defined(CONFIG_USER_ONLY)
+    /* Directed Privileged Door-bell Exception State, used for IPI */
+    spr_register_kvm_hv(env, SPR_DPDES, "DPDES",
+                        SPR_NOACCESS, SPR_NOACCESS,
+                        &spr_read_generic, SPR_NOACCESS,
+                        &spr_read_generic, &spr_write_generic,
+                        KVM_REG_PPC_DPDES, 0x00000000);
+#endif
+}
+
 static void gen_spr_power8_ic(CPUPPCState *env)
 {
 #if !defined(CONFIG_USER_ONLY)
@@ -8629,6 +8641,7 @@ static void init_proc_POWER8(CPUPPCState *env)
     gen_spr_power8_pmu_user(env);
     gen_spr_power8_tm(env);
     gen_spr_power8_pspb(env);
+    gen_spr_power8_dpdes(env);
     gen_spr_vtb(env);
     gen_spr_power8_ic(env);
     gen_spr_power8_book4(env);
@@ -8817,6 +8830,7 @@ static void init_proc_POWER9(CPUPPCState *env)
     gen_spr_power8_pmu_user(env);
     gen_spr_power8_tm(env);
     gen_spr_power8_pspb(env);
+    gen_spr_power8_dpdes(env);
     gen_spr_vtb(env);
     gen_spr_power8_ic(env);
     gen_spr_power8_book4(env);