[Qemu-ppc] [PATCH v3] xics: Add H_IPOLL implementation

[Alexey Kardashevskiy]

From: Benjamin Herrenschmidt <address@hidden>

This adds support for the H_IPOLL hypercall which the guest
uses to poll for a pending interrupt. This hypercall is
mandatory for PAPR+ and there is no way for the guest to
detect whether it is supported or not so just add it.

Signed-off-by: Benjamin Herrenschmidt <address@hidden>
Signed-off-by: Alexey Kardashevskiy <address@hidden>
---
 hw/intc/xics.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/hw/intc/xics.c b/hw/intc/xics.c
index f439e8d..2e6111d 100644
--- a/hw/intc/xics.c
+++ b/hw/intc/xics.c
@@ -689,6 +689,18 @@ static target_ulong h_eoi(PowerPCCPU *cpu, 
sPAPREnvironment *spapr,
     return H_SUCCESS;
 }
 
+static target_ulong h_ipoll(PowerPCCPU *cpu, sPAPREnvironment *spapr,
+                            target_ulong opcode, target_ulong *args)
+{
+    CPUState *cs = CPU(cpu);
+    ICPState *ss = &spapr->icp->ss[cs->cpu_index];
+
+    args[0] = ss->xirr;
+    args[1] = ss->mfrr;
+
+    return H_SUCCESS;
+}
+
 static void rtas_set_xive(PowerPCCPU *cpu, sPAPREnvironment *spapr,
                           uint32_t token,
                           uint32_t nargs, target_ulong args,
@@ -842,6 +854,7 @@ static void xics_realize(DeviceState *dev, Error **errp)
     spapr_register_hypercall(H_IPI, h_ipi);
     spapr_register_hypercall(H_XIRR, h_xirr);
     spapr_register_hypercall(H_EOI, h_eoi);
+    spapr_register_hypercall(H_IPOLL, h_ipoll);
 
     object_property_set_bool(OBJECT(icp->ics), true, "realized", &error);
     if (error) {
-- 
1.8.4.rc4