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Violators will be prosecuted for from ; Wed, 8 Aug 2018 16:59:39 +0100 From: Bharata B Rao Date: Wed, 8 Aug 2018 21:29:19 +0530 Message-Id: <20180808155919.12972-1-bharata@linux.ibm.com> Subject: [Qemu-devel] [PATCH] spapr_cpu_core: vmstate_[un]register per-CPU data from (un)realizefn List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-ppc@nongnu.org, david@gibson.dropbear.id.au, groug@kaod.org, sathnaga@linux.vnet.ibm.com, Bharata B Rao VMStateDescription vmstate_spapr_cpu_state was added by commit b94020268e0b6 (spapr_cpu_core: migrate per-CPU data) to migrate per-CPU data with the required vmstate registration and unregistration calls. However the unregistration is being done only from vcpu creation error path and not from CPU delete path. This causes migration to fail with the following error if migration is attempted after a CPU unplug like this: Unknown savevm section or instance 'spapr_cpu' 16 Additionally this leaves the source VM unresponsive after migration failure. Fix this by ensuring the vmstate_unregister happens during CPU removal. Fixing this becomes easier when vmstate (un)registration calls are moved to vcpu (un)realize functions which is what this patch does. Fixes: https://bugs.launchpad.net/qemu/+bug/1785972 Reported-by: Satheesh Rajendran Signed-off-by: Bharata B Rao --- hw/ppc/spapr_cpu_core.c | 62 +++++++++++++++++++++++++------------------------ 1 file changed, 32 insertions(+), 30 deletions(-) diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c index 993759db47..bb88a3ce4e 100644 --- a/hw/ppc/spapr_cpu_core.c +++ b/hw/ppc/spapr_cpu_core.c @@ -113,26 +113,6 @@ const char *spapr_get_cpu_core_type(const char *cpu_type) return object_class_get_name(oc); } -static void spapr_unrealize_vcpu(PowerPCCPU *cpu) -{ - qemu_unregister_reset(spapr_cpu_reset, cpu); - object_unparent(cpu->intc); - cpu_remove_sync(CPU(cpu)); - object_unparent(OBJECT(cpu)); -} - -static void spapr_cpu_core_unrealize(DeviceState *dev, Error **errp) -{ - sPAPRCPUCore *sc = SPAPR_CPU_CORE(OBJECT(dev)); - CPUCore *cc = CPU_CORE(dev); - int i; - - for (i = 0; i < cc->nr_threads; i++) { - spapr_unrealize_vcpu(sc->threads[i]); - } - g_free(sc->threads); -} - static bool slb_shadow_needed(void *opaque) { sPAPRCPUState *spapr_cpu = opaque; @@ -207,10 +187,34 @@ static const VMStateDescription vmstate_spapr_cpu_state = { } }; +static void spapr_unrealize_vcpu(PowerPCCPU *cpu, sPAPRCPUCore *sc) +{ + if (!sc->pre_3_0_migration) { + vmstate_unregister(NULL, &vmstate_spapr_cpu_state, cpu->machine_data); + } + qemu_unregister_reset(spapr_cpu_reset, cpu); + object_unparent(cpu->intc); + cpu_remove_sync(CPU(cpu)); + object_unparent(OBJECT(cpu)); +} + +static void spapr_cpu_core_unrealize(DeviceState *dev, Error **errp) +{ + sPAPRCPUCore *sc = SPAPR_CPU_CORE(OBJECT(dev)); + CPUCore *cc = CPU_CORE(dev); + int i; + + for (i = 0; i < cc->nr_threads; i++) { + spapr_unrealize_vcpu(sc->threads[i], sc); + } + g_free(sc->threads); +} + static void spapr_realize_vcpu(PowerPCCPU *cpu, sPAPRMachineState *spapr, - Error **errp) + sPAPRCPUCore *sc, Error **errp) { CPUPPCState *env = &cpu->env; + CPUState *cs = CPU(cpu); Error *local_err = NULL; object_property_set_bool(OBJECT(cpu), true, "realized", &local_err); @@ -233,6 +237,11 @@ static void spapr_realize_vcpu(PowerPCCPU *cpu, sPAPRMachineState *spapr, goto error_unregister; } + if (!sc->pre_3_0_migration) { + vmstate_register(NULL, cs->cpu_index, &vmstate_spapr_cpu_state, + cpu->machine_data); + } + return; error_unregister: @@ -272,10 +281,6 @@ static PowerPCCPU *spapr_create_vcpu(sPAPRCPUCore *sc, int i, Error **errp) } cpu->machine_data = g_new0(sPAPRCPUState, 1); - if (!sc->pre_3_0_migration) { - vmstate_register(NULL, cs->cpu_index, &vmstate_spapr_cpu_state, - cpu->machine_data); - } object_unref(obj); return cpu; @@ -290,9 +295,6 @@ static void spapr_delete_vcpu(PowerPCCPU *cpu, sPAPRCPUCore *sc) { sPAPRCPUState *spapr_cpu = spapr_cpu_state(cpu); - if (!sc->pre_3_0_migration) { - vmstate_unregister(NULL, &vmstate_spapr_cpu_state, cpu->machine_data); - } cpu->machine_data = NULL; g_free(spapr_cpu); object_unparent(OBJECT(cpu)); @@ -325,7 +327,7 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error **errp) } for (j = 0; j < cc->nr_threads; j++) { - spapr_realize_vcpu(sc->threads[j], spapr, &local_err); + spapr_realize_vcpu(sc->threads[j], spapr, sc, &local_err); if (local_err) { goto err_unrealize; } @@ -334,7 +336,7 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error **errp) err_unrealize: while (--j >= 0) { - spapr_unrealize_vcpu(sc->threads[j]); + spapr_unrealize_vcpu(sc->threads[j], sc); } err: while (--i >= 0) { -- 2.14.3