From 630eb0faf4d3c04a117a047247691e0654632aa8 Mon Sep 17 00:00:00 2001 From: Igor Mammedov Date: Wed, 27 Jul 2016 11:24:54 +0200 Subject: [PATCH] exec: Ensure the only one cpu_index allocation method is used Make sure that cpu_index auto allocation isn't used in combination with manual cpu_index assignment. And dissallow out of order cpu removal if auto allocation is in use. Target that wishes to support out of order unplug should switch to manual cpu_index assignment. Following patch could be used as an example: (pc: init CPUState->cpu_index with index in possible_cpus[])) Signed-off-by: Igor Mammedov Signed-off-by: Eduardo Habkost --- exec.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/exec.c b/exec.c index 8ffde75983..80398b038f 100644 --- a/exec.c +++ b/exec.c @@ -598,11 +598,14 @@ AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx) } #endif +static bool cpu_index_auto_assigned; + static int cpu_get_free_index(void) { CPUState *some_cpu; int cpu_index = 0; + cpu_index_auto_assigned = true; CPU_FOREACH(some_cpu) { cpu_index++; } @@ -620,6 +623,8 @@ void cpu_exec_exit(CPUState *cpu) return; } + assert(!(cpu_index_auto_assigned && cpu != QTAILQ_LAST(&cpus, CPUTailQ))); + QTAILQ_REMOVE(&cpus, cpu, node); cpu->node.tqe_prev = NULL; cpu->cpu_index = UNASSIGNED_CPU_INDEX; @@ -663,6 +668,8 @@ void cpu_exec_init(CPUState *cpu, Error **errp) if (cpu->cpu_index == UNASSIGNED_CPU_INDEX) { cpu->cpu_index = cpu_get_free_index(); assert(cpu->cpu_index != UNASSIGNED_CPU_INDEX); + } else { + assert(!cpu_index_auto_assigned); } QTAILQ_INSERT_TAIL(&cpus, cpu, node); cpu_list_unlock();