[Qemu-devel] [PATCH] target/ppc: fix CPU hotplug when radix is enabled (TCG)

["Cédric Le Goater" <clg@kaod.org>]

But when a guest initializes radix mode, it issues a H_REGISTER_PROC_TBL
to update the LPCR of all CPUs. Hot-plugged CPUs inherit from the same
setting under KVM but not under TCG. So, Let's check for radix and update
the default LPCR to keep new CPUs in sync.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/translate_init.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
index 8b9807665dd5..8776e9b0f8fa 100644
--- a/target/ppc/translate_init.c
+++ b/target/ppc/translate_init.c
@@ -9014,8 +9014,16 @@ void cpu_ppc_set_papr(PowerPCCPU *cpu, PPCVirtualHypervisor *vhyp)
         /* By default we choose legacy mode and switch to new hash or radix
          * when a register process table hcall is made. So disable process
          * tables and guest translation shootdown by default
+         *
+         * Hot-plugged CPUs inherit from the guest radix setting under
+         * KVM but not under TCG. Update the default LPCR to keep new
+         * CPUs in sync when radix is enabled.
          */
-        lpcr->default_value &= ~(LPCR_UPRT | LPCR_GTSE);
+        if (ppc64_radix_guest(cpu)) {
+            lpcr->default_value |= LPCR_UPRT | LPCR_GTSE;
+        } else {
+            lpcr->default_value &= ~(LPCR_UPRT | LPCR_GTSE);
+        }
         lpcr->default_value |= LPCR_PDEE | LPCR_HDEE | LPCR_EEE | LPCR_DEE |
                                LPCR_OEE;
         break;
-- 
2.7.5