spapr: Print out extra hints when CAS negotiation of interrupt mode fails

Let's suggest to the user how the machine should be configured to allow
the guest to boot successfully.

Suggested-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <155799221739.527449.14907564571096243745.stgit@bahia.lan>
Reviewed-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Tested-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
[dwg: Adjusted for style error]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 63a55614b83d704e12493091eb0d78abd33b9273..0a050ad3d85f8fa91f9ab7db088cc512183c8979 100644 (file)
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1646,12 +1646,14 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
      */
     if (guest_xive) {
         if (spapr->irq->ov5 == SPAPR_OV5_XIVE_LEGACY) {
-            error_report("Guest requested unavailable interrupt mode (XIVE)");
+            error_report(
+"Guest requested unavailable interrupt mode (XIVE), try the ic-mode=xive or ic-mode=dual machine property");
             exit(EXIT_FAILURE);
         }
     } else {
         if (spapr->irq->ov5 == SPAPR_OV5_XIVE_EXPLOIT) {
-            error_report("Guest requested unavailable interrupt mode (XICS)");
+            error_report(
+"Guest requested unavailable interrupt mode (XICS), either don't set the ic-mode machine property or try ic-mode=xics or ic-mode=dual");
             exit(EXIT_FAILURE);
         }
     }