From f2aeed761d2dad14920fa08c977dc45564886d9b Mon Sep 17 00:00:00 2001
From: David Gibson <dgibson@redhat.com>
Date: Fri, 3 Jan 2020 01:15:12 +0000
Subject: [PATCH 1/5] spapr: Don't trigger a CAS reboot for XICS/XIVE mode
 changeover
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RH-Author: David Gibson <dgibson@redhat.com>
Message-id: <20200103011512.49129-2-dgibson@redhat.com>
Patchwork-id: 93261
O-Subject: [RHEL-AV-4.2 qemu-kvm PATCH 1/1] spapr: Don't trigger a CAS reboot for XICS/XIVE mode changeover
Bugzilla: 1733893
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>

From: David Gibson <david@gibson.dropbear.id.au>

PAPR allows the interrupt controller used on a POWER9 machine (XICS or
XIVE) to be selected by the guest operating system, by using the
ibm,client-architecture-support (CAS) feature negotiation call.

Currently, if the guest selects an interrupt controller different from the
one selected at initial boot, this causes the system to be reset with the
new model and the boot starts again.  This means we run through the SLOF
boot process twice, as well as any other bootloader (e.g. grub) in use
before the OS calls CAS.  This can be confusing and/or inconvenient for
users.

Thanks to two fairly recent changes, we no longer need this reboot.  1) we
now completely regenerate the device tree when CAS is called (meaning we
don't need special case updates for all the device tree changes caused by
the interrupt controller mode change),  2) we now have explicit code paths
to activate and deactivate the different interrupt controllers, rather than
just implicitly calling those at machine reset time.

We can therefore eliminate the reboot for changing irq mode, simply by
putting a call to spapr_irq_update_active_intc() before we call
spapr_h_cas_compose_response() (which gives the updated device tree to
the guest firmware and OS).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cedric Le Goater <clg@fr.ibm.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
(cherry picked from commit 8deb8019d696c75e6ecaee7545026b62aba2f1bb)

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1733893

Signed-off-by: David Gibson <dgibson@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 hw/ppc/spapr_hcall.c | 33 +++++++++++++--------------------
 1 file changed, 13 insertions(+), 20 deletions(-)

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 140f05c..05a7ca2 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1767,21 +1767,10 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
     }
     spapr->cas_pre_isa3_guest = !spapr_ovec_test(ov1_guest, OV1_PPC_3_00);
     spapr_ovec_cleanup(ov1_guest);
-    if (!spapr->cas_reboot) {
-        /* If spapr_machine_reset() did not set up a HPT but one is necessary
-         * (because the guest isn't going to use radix) then set it up here. */
-        if ((spapr->patb_entry & PATE1_GR) && !guest_radix) {
-            /* legacy hash or new hash: */
-            spapr_setup_hpt_and_vrma(spapr);
-        }
-        spapr->cas_reboot =
-            (spapr_h_cas_compose_response(spapr, args[1], args[2],
-                                          ov5_updates) != 0);
-    }
 
     /*
-     * Ensure the guest asks for an interrupt mode we support; otherwise
-     * terminate the boot.
+     * Ensure the guest asks for an interrupt mode we support;
+     * otherwise terminate the boot.
      */
     if (guest_xive) {
         if (!spapr->irq->xive) {
@@ -1797,14 +1786,18 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
         }
     }
 
-    /*
-     * Generate a machine reset when we have an update of the
-     * interrupt mode. Only required when the machine supports both
-     * modes.
-     */
+    spapr_irq_update_active_intc(spapr);
+
     if (!spapr->cas_reboot) {
-        spapr->cas_reboot = spapr_ovec_test(ov5_updates, OV5_XIVE_EXPLOIT)
-            && spapr->irq->xics && spapr->irq->xive;
+        /* If spapr_machine_reset() did not set up a HPT but one is necessary
+         * (because the guest isn't going to use radix) then set it up here. */
+        if ((spapr->patb_entry & PATE1_GR) && !guest_radix) {
+            /* legacy hash or new hash: */
+            spapr_setup_hpt_and_vrma(spapr);
+        }
+        spapr->cas_reboot =
+            (spapr_h_cas_compose_response(spapr, args[1], args[2],
+                                          ov5_updates) != 0);
     }
 
     spapr_ovec_cleanup(ov5_updates);
-- 
1.8.3.1

