From 0550b1206a91d66051a21441a02c4ff126b531fe Mon Sep 17 00:00:00 2001 From: Greg Kurz Date: Thu, 3 May 2018 23:16:59 +0200 Subject: spapr: don't advertise radix GTSE if max-compat-cpu < power9 On a POWER9 host, if a guest runs in pre POWER9 compat mode, it necessarily uses the hash MMU mode. In this case, we shouldn't advertise radix GTSE in the ibm,arch-vec-5-platform-support DT property as the current code does. The first reason is that it doesn't make sense, and the second one is that causes the CAS-negotiated options subsection to be migrated. This breaks backward migration to QEMU 2.7 and older versions on POWER8 hosts: qemu-system-ppc64: error while loading state for instance 0x0 of device 'spapr' qemu-system-ppc64: load of migration failed: No such file or directory This patch hence initialize CPUs a bit earlier so that we can check the requested compat mode, and don't set OV5_MMU_RADIX_GTSE for power8 and older. Signed-off-by: Greg Kurz Signed-off-by: David Gibson --- hw/ppc/spapr.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) (limited to 'hw') diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 19997f66c0..32ab3c43b6 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -2512,6 +2512,7 @@ static void spapr_machine_init(MachineState *machine) long load_limit, fw_size; char *filename; Error *resize_hpt_err = NULL; + PowerPCCPU *first_ppc_cpu; msi_nonbroken = true; @@ -2592,11 +2593,6 @@ static void spapr_machine_init(MachineState *machine) } spapr_ovec_set(spapr->ov5, OV5_FORM1_AFFINITY); - if (!kvm_enabled() || kvmppc_has_cap_mmu_radix()) { - /* KVM and TCG always allow GTSE with radix... */ - spapr_ovec_set(spapr->ov5, OV5_MMU_RADIX_GTSE); - } - /* ... but not with hash (currently). */ /* advertise support for dedicated HP event source to guests */ if (spapr->use_hotplug_event_source) { @@ -2614,6 +2610,15 @@ static void spapr_machine_init(MachineState *machine) /* init CPUs */ spapr_init_cpus(spapr); + first_ppc_cpu = POWERPC_CPU(first_cpu); + if ((!kvm_enabled() || kvmppc_has_cap_mmu_radix()) && + ppc_check_compat(first_ppc_cpu, CPU_POWERPC_LOGICAL_3_00, 0, + spapr->max_compat_pvr)) { + /* KVM and TCG always allow GTSE with radix... */ + spapr_ovec_set(spapr->ov5, OV5_MMU_RADIX_GTSE); + } + /* ... but not with hash (currently). */ + if (kvm_enabled()) { /* Enable H_LOGICAL_CI_* so SLOF can talk to in-kernel devices */ kvmppc_enable_logical_ci_hcalls(); -- cgit v1.2.1