Hi Jonathan,
> From: Jonathan Cameron <jonathan.came...@huawei.com>
> Sent: Monday, October 2, 2023 5:20 PM
> To: Salil Mehta <salil.me...@huawei.com>
> Cc: qemu-devel@nongnu.org; qemu-...@nongnu.org; m...@kernel.org; jean-
> phili...@linaro.org; lpieral...@kernel.org; peter.mayd...@linaro.org;
> richard.hender...@linaro.org; imamm...@redhat.com; andrew.jo...@linux.dev;
> da...@redhat.com; phi...@linaro.org; eric.au...@redhat.com;
> oliver.up...@linux.dev; pbonz...@redhat.com; m...@redhat.com;
> w...@kernel.org; gs...@redhat.com; raf...@kernel.org;
> alex.ben...@linaro.org; li...@armlinux.org.uk;
> dar...@os.amperecomputing.com; il...@os.amperecomputing.com;
> vis...@os.amperecomputing.com; karl.heub...@oracle.com;
> miguel.l...@oracle.com; salil.me...@opnsrc.net; zhukeqian
> <zhukeqi...@huawei.com>; wangxiongfeng (C) <wangxiongfe...@huawei.com>;
> wangyanan (Y) <wangyana...@huawei.com>; jiakern...@gmail.com;
> maob...@loongson.cn; lixiang...@loongson.cn; Linuxarm <linux...@huawei.com>
> Subject: Re: [PATCH V2 08/10] physmem: Add helper function to destroy CPU
> AddressSpace
>
> On Sat, 30 Sep 2023 01:19:31 +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>
>
> I'm not that familiar with this bit of the code, so no tag, but
> as far as I can tell from a fairly superficial look, this is good.
Ok no problem. Thanks.
Salil.
> > include/exec/cpu-common.h | 8 ++++++++
> > include/hw/core/cpu.h | 1 +
> > softmmu/physmem.c | 25 +++++++++++++++++++++++++
> > 3 files changed, 34 insertions(+)
> >
> > diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
> > index 41788c0bdd..eb56a228a2 100644
> > --- a/include/exec/cpu-common.h
> > +++ b/include/exec/cpu-common.h
> > @@ -120,6 +120,14 @@ 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 648b5b3586..65d2ae4581 100644
> > --- a/include/hw/core/cpu.h
> > +++ b/include/hw/core/cpu.h
> > @@ -355,6 +355,7 @@ struct CPUState {
> > QSIMPLEQ_HEAD(, qemu_work_item) work_list;
> >
> > CPUAddressSpace *cpu_ases;
> > + int cpu_ases_count;
> > int num_ases;
> > AddressSpace *as;
> > MemoryRegion *memory;
> > diff --git a/softmmu/physmem.c b/softmmu/physmem.c
> > index 4f6ca653b3..4dfa0ca66f 100644
> > --- a/softmmu/physmem.c
> > +++ b/softmmu/physmem.c
> > @@ -761,6 +761,7 @@ 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];
> > @@ -774,6 +775,30 @@ void cpu_address_space_init(CPUState *cpu, int
> asidx,
> > }
> > }
> >
> > +void cpu_address_space_destroy(CPUState *cpu, int asidx)
> > +{
> > + CPUAddressSpace *cpuas;
> > +
> > + assert(asidx < cpu->num_ases);
> > + assert(asidx == 0 || !kvm_enabled());
> > + assert(cpu->cpu_ases);
> > +
> > + 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 (cpu->cpu_ases_count == 1) {
> > + g_free(cpu->cpu_ases);
> > + cpu->cpu_ases = NULL;
> > + }
> > +
> > + cpu->cpu_ases_count--;
> > +}
> > +
> > AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx)
> > {
> > /* Return the AddressSpace corresponding to the specified index */
