[PATCH for-5.0 v5 11/23] ppc/pnv: Introduce a pnv_xive_is_cpu_enabled() helper

["Cédric Le Goater" <clg@kaod.org>]

and use this helper to exclude CPUs which are not enabled in the XIVE
controller.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/intc/pnv_xive.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/hw/intc/pnv_xive.c b/hw/intc/pnv_xive.c
index 71ca4961b6b1..4c8c6e51c20f 100644
--- a/hw/intc/pnv_xive.c
+++ b/hw/intc/pnv_xive.c
@@ -372,6 +372,20 @@ static int pnv_xive_get_eas(XiveRouter *xrtr, uint8_t blk, uint32_t idx,
     return pnv_xive_vst_read(xive, VST_TSEL_IVT, blk, idx, eas);
 }
 
+static int cpu_pir(PowerPCCPU *cpu)
+{
+    CPUPPCState *env = &cpu->env;
+    return env->spr_cb[SPR_PIR].default_value;
+}
+
+static bool pnv_xive_is_cpu_enabled(PnvXive *xive, PowerPCCPU *cpu)
+{
+    int pir = cpu_pir(cpu);
+    int thrd_id = pir & 0x7f;
+
+    return xive->regs[PC_THREAD_EN_REG0 >> 3] & PPC_BIT(thrd_id);
+}
+
 static int pnv_xive_match_nvt(XivePresenter *xptr, uint8_t format,
                               uint8_t nvt_blk, uint32_t nvt_idx,
                               bool cam_ignore, uint8_t priority,
@@ -393,6 +407,10 @@ static int pnv_xive_match_nvt(XivePresenter *xptr, uint8_t format,
             XiveTCTX *tctx;
             int ring;
 
+            if (!pnv_xive_is_cpu_enabled(xive, cpu)) {
+                continue;
+            }
+
             tctx = XIVE_TCTX(pnv_cpu_state(cpu)->intc);
 
             /*
-- 
2.21.0