[Qemu-devel] [PATCH 10/10] target/ppc: Add support for LPCR:HEIC on POWER9

["Cédric Le Goater" <clg@kaod.org>]

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

This controls whether the External Interrupt (0x500) can be
delivered to the hypervisor or not.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
---
 target/ppc/excp_helper.c        | 5 ++++-
 target/ppc/translate_init.inc.c | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index d171a5eb6236..39bedbb11db0 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -827,7 +827,10 @@ static void ppc_hw_interrupt(CPUPPCState *env)
     /* 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)) {
+        bool heic = !!(env->spr[SPR_LPCR] & LPCR_HEIC);
+        /* HEIC blocks delivery to the hypervisor */
+        if ((async_deliver && !(heic && msr_hv && !msr_pr)) ||
+            (env->has_hv_mode && msr_hv == 0 && !lpes0)) {
             powerpc_excp(cpu, env->excp_model, POWERPC_EXCP_EXTERNAL);
             return;
         }
diff --git a/target/ppc/translate_init.inc.c b/target/ppc/translate_init.inc.c
index befa1a95cd77..be95324bad95 100644
--- a/target/ppc/translate_init.inc.c
+++ b/target/ppc/translate_init.inc.c
@@ -8823,7 +8823,10 @@ static bool cpu_has_work_POWER9(CPUState *cs)
         /* External Exception */
         if ((env->pending_interrupts & (1u << PPC_INTERRUPT_EXT)) &&
             (env->spr[SPR_LPCR] & LPCR_EEE)) {
-            return true;
+            bool heic = !!(env->spr[SPR_LPCR] & LPCR_HEIC);
+            if (heic == 0 || !msr_hv || msr_pr) {
+                return true;
+            }
         }
         /* Decrementer Exception */
         if ((env->pending_interrupts & (1u << PPC_INTERRUPT_DECR)) &&
-- 
2.20.1