[Qemu-devel] [PATCH 16/19] target/ppc: Add Hypervisor Virtualization Interrupt on POWER9

["Cédric Le Goater" <clg@kaod.org>]

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>

This adds support for delivering that exception

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/cpu.h                |  5 ++++-
 target/ppc/excp_helper.c        | 17 ++++++++++++++++-
 target/ppc/translate_init.inc.c | 16 +++++++++++++++-
 3 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index b69410ea2541..385d33bd37ff 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -160,8 +160,10 @@ enum {
     /* Server doorbell variants */
     POWERPC_EXCP_SDOOR    = 99,
     POWERPC_EXCP_SDOOR_HV = 100,
+    /* ISA 3.00 additions */
+    POWERPC_EXCP_HVIRT    = 101,
     /* EOL                                                                   */
-    POWERPC_EXCP_NB       = 101,
+    POWERPC_EXCP_NB       = 102,
     /* QEMU exceptions: used internally during code translation              */
     POWERPC_EXCP_STOP         = 0x200, /* stop translation                   */
     POWERPC_EXCP_BRANCH       = 0x201, /* branch instruction                 */
@@ -2344,6 +2346,7 @@ enum {
     PPC_INTERRUPT_PERFM,          /* Performance monitor interrupt        */
     PPC_INTERRUPT_HMI,            /* Hypervisor Maintainance interrupt    */
     PPC_INTERRUPT_HDOORBELL,      /* Hypervisor Doorbell interrupt        */
+    PPC_INTERRUPT_HVIRT,          /* Hypervisor virtualization interrupt  */
 };
 
 /* Processor Compatibility mask (PCR) */
diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index 1a2f469a5fa2..d171a5eb6236 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -97,6 +97,9 @@ static int powerpc_reset_wakeup(CPUState *cs, CPUPPCState *env, int excp,
     case POWERPC_EXCP_HV_MAINT:
         *msr |= 0xaull << (63 - 45);
         break;
+    case POWERPC_EXCP_HVIRT:
+        *msr |= 0x9ull << (63 - 45);
+        break;
     default:
         cpu_abort(cs, "Unsupported exception %d in Power Save mode\n",
                   excp);
@@ -427,6 +430,7 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
     case POWERPC_EXCP_HISEG:     /* Hypervisor instruction segment exception */
     case POWERPC_EXCP_SDOOR_HV:  /* Hypervisor Doorbell interrupt            */
     case POWERPC_EXCP_HV_EMU:
+    case POWERPC_EXCP_HVIRT:     /* Hypervisor virtualization                */
         srr0 = SPR_HSRR0;
         srr1 = SPR_HSRR1;
         new_msr |= (target_ulong)MSR_HVB;
@@ -809,7 +813,18 @@ static void ppc_hw_interrupt(CPUPPCState *env)
             return;
         }
     }
-    /* Extermal interrupt can ignore MSR:EE under some circumstances */
+
+    /* Hypervisor virtualization interrupt */
+    if (env->pending_interrupts & (1 << PPC_INTERRUPT_HVIRT)) {
+        /* LPCR will be clear when not supported so this will work */
+        bool hvice = !!(env->spr[SPR_LPCR] & LPCR_HVICE);
+        if ((async_deliver || msr_hv == 0) && hvice) {
+            powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_HVIRT);
+            return;
+        }
+    }
+
+    /* External interrupt can ignore MSR:EE under some circumstances */
     if (env->pending_interrupts & (1 << PPC_INTERRUPT_EXT)) {
         bool lpes0 = !!(env->spr[SPR_LPCR] & LPCR_LPES0);
         if (async_deliver || (env->has_hv_mode && msr_hv == 0 && !lpes0)) {
diff --git a/target/ppc/translate_init.inc.c b/target/ppc/translate_init.inc.c
index c1719c46a383..6ffa4a8fe0fa 100644
--- a/target/ppc/translate_init.inc.c
+++ b/target/ppc/translate_init.inc.c
@@ -3313,6 +3313,15 @@ static void init_excp_POWER8(CPUPPCState *env)
 #endif
 }
 
+static void init_excp_POWER9(CPUPPCState *env)
+{
+    init_excp_POWER8(env);
+
+#if !defined(CONFIG_USER_ONLY)
+    env->excp_vectors[POWERPC_EXCP_HVIRT]    = 0x00000EA0;
+#endif
+}
+
 #endif
 
 /*****************************************************************************/
@@ -8783,7 +8792,7 @@ static void init_proc_POWER9(CPUPPCState *env)
     env->icache_line_size = 128;
 
     /* Allocate hardware IRQ controller */
-    init_excp_POWER8(env);
+    init_excp_POWER9(env);
     ppcPOWER7_irq_init(ppc_env_get_cpu(env));
 }
 
@@ -8836,6 +8845,11 @@ static bool cpu_has_work_POWER9(CPUState *cs)
             (env->spr[SPR_LPCR] & LPCR_HDEE)) {
             return true;
         }
+        /* Hypervisor virtualization exception */
+        if ((env->pending_interrupts & (1u << PPC_INTERRUPT_HVIRT)) &&
+            (env->spr[SPR_LPCR] & LPCR_HVEE)) {
+            return true;
+        }
         if (env->pending_interrupts & (1u << PPC_INTERRUPT_RESET)) {
             return true;
         }
-- 
2.20.1