On Fri, 7 Jun 2024 12:56:47 +0100 Salil Mehta <salil.me...@huawei.com> wrote:
> Virtual CPU Hot-unplug leads to unrealization of a CPU object. This also > involves destruction of the CPU AddressSpace. Add common function to help > destroy the CPU AddressSpace. > > Signed-off-by: Salil Mehta <salil.me...@huawei.com> > Tested-by: Vishnu Pajjuri <vis...@os.amperecomputing.com> > Reviewed-by: Gavin Shan <gs...@redhat.com> > Tested-by: Xianglai Li <lixiang...@loongson.cn> > Tested-by: Miguel Luis <miguel.l...@oracle.com> > Reviewed-by: Shaoqin Huang <shahu...@redhat.com> > Tested-by: Zhao Liu <zhao1....@intel.com> Acked-by: Igor Mammedov <imamm...@redhat.com> > --- > include/exec/cpu-common.h | 8 ++++++++ > include/hw/core/cpu.h | 1 + > system/physmem.c | 29 +++++++++++++++++++++++++++++ > 3 files changed, 38 insertions(+) > > diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h > index 815342d043..240ee04369 100644 > --- a/include/exec/cpu-common.h > +++ b/include/exec/cpu-common.h > @@ -129,6 +129,14 @@ size_t qemu_ram_pagesize_largest(void); > */ > void cpu_address_space_init(CPUState *cpu, int asidx, > const char *prefix, MemoryRegion *mr); > +/** > + * cpu_address_space_destroy: > + * @cpu: CPU for which address space needs to be destroyed > + * @asidx: integer index of this address space > + * > + * Note that with KVM only one address space is supported. > + */ > +void cpu_address_space_destroy(CPUState *cpu, int asidx); > > void cpu_physical_memory_rw(hwaddr addr, void *buf, > hwaddr len, bool is_write); > diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h > index bb398e8237..60b160d0b4 100644 > --- a/include/hw/core/cpu.h > +++ b/include/hw/core/cpu.h > @@ -486,6 +486,7 @@ struct CPUState { > QSIMPLEQ_HEAD(, qemu_work_item) work_list; > > struct CPUAddressSpace *cpu_ases; > + int cpu_ases_count; > int num_ases; > AddressSpace *as; > MemoryRegion *memory; > diff --git a/system/physmem.c b/system/physmem.c > index 342b7a8fd4..146f17826a 100644 > --- a/system/physmem.c > +++ b/system/physmem.c > @@ -763,6 +763,7 @@ void cpu_address_space_init(CPUState *cpu, int asidx, > > if (!cpu->cpu_ases) { > cpu->cpu_ases = g_new0(CPUAddressSpace, cpu->num_ases); > + cpu->cpu_ases_count = cpu->num_ases; > } > > newas = &cpu->cpu_ases[asidx]; > @@ -776,6 +777,34 @@ void cpu_address_space_init(CPUState *cpu, int asidx, > } > } > > +void cpu_address_space_destroy(CPUState *cpu, int asidx) > +{ > + CPUAddressSpace *cpuas; > + > + assert(cpu->cpu_ases); > + assert(asidx >= 0 && asidx < cpu->num_ases); > + /* KVM cannot currently support multiple address spaces. */ > + assert(asidx == 0 || !kvm_enabled()); > + > + cpuas = &cpu->cpu_ases[asidx]; > + if (tcg_enabled()) { > + memory_listener_unregister(&cpuas->tcg_as_listener); > + } > + > + address_space_destroy(cpuas->as); > + g_free_rcu(cpuas->as, rcu); > + > + if (asidx == 0) { > + /* reset the convenience alias for address space 0 */ > + cpu->as = NULL; > + } > + > + if (--cpu->cpu_ases_count == 0) { > + g_free(cpu->cpu_ases); > + cpu->cpu_ases = NULL; > + } > +} > + > AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx) > { > /* Return the AddressSpace corresponding to the specified index */