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Fri, 29 Sep 2023 15:36:34 +0100 (BST) References: <20230929124304.13672-1-salil.mehta@huawei.com> <20230929124304.13672-9-salil.mehta@huawei.com> User-agent: mu4e 1.11.20; emacs 29.1.50 From: Alex =?utf-8?Q?Benn=C3=A9e?= To: Salil Mehta Cc: qemu-devel@nongnu.org, qemu-arm@nongnu.org, maz@kernel.org, jean-philippe@linaro.org, jonathan.cameron@huawei.com, lpieralisi@kernel.org, peter.maydell@linaro.org, richard.henderson@linaro.org, imammedo@redhat.com, andrew.jones@linux.dev, david@redhat.com, philmd@linaro.org, eric.auger@redhat.com, oliver.upton@linux.dev, pbonzini@redhat.com, mst@redhat.com, will@kernel.org, gshan@redhat.com, rafael@kernel.org, linux@armlinux.org.uk, darren@os.amperecomputing.com, ilkka@os.amperecomputing.com, vishnu@os.amperecomputing.com, karl.heubaum@oracle.com, miguel.luis@oracle.com, salil.mehta@opnsrc.net, zhukeqian1@huawei.com, wangxiongfeng2@huawei.com, wangyanan55@huawei.com, jiakernel2@gmail.com, maobibo@loongson.cn, lixianglai@loongson.cn, linuxarm@huawei.com Subject: Re: [PATCH 8/9] physmem,gdbstub: Add helper functions to help *unrealize* vCPU object Date: Fri, 29 Sep 2023 15:34:38 +0100 In-reply-to: <20230929124304.13672-9-salil.mehta@huawei.com> Message-ID: <87ttrdnj0t.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=2a00:1450:4864:20::432; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x432.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Salil Mehta writes: > vCPU Hot-unplug requires some helper functions to unroll what has happened > during realization of a CPU object. > > Signed-off-by: Salil Mehta > --- > gdbstub/gdbstub.c | 13 +++++++++++++ > include/exec/cpu-common.h | 8 ++++++++ > include/exec/gdbstub.h | 1 + > include/hw/core/cpu.h | 1 + > softmmu/physmem.c | 25 +++++++++++++++++++++++++ > 5 files changed, 48 insertions(+) > > diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c > index 349d348c7b..a06ea3adad 100644 > --- a/gdbstub/gdbstub.c > +++ b/gdbstub/gdbstub.c > @@ -491,6 +491,19 @@ void gdb_register_coprocessor(CPUState *cpu, > } > } >=20=20 > +void gdb_unregister_coprocessor_all(CPUState *cpu) > +{ > + GDBRegisterState *s, *p; > + > + p =3D cpu->gdb_regs; > + while (p) { > + s =3D p; > + p =3D p->next; Maybe add: /* s->xml is static const char so isn't freed */ > + g_free(s); > + } > + cpu->gdb_regs =3D NULL; > +} > + > static void gdb_process_breakpoint_remove_all(GDBProcess *p) > { > CPUState *cpu =3D gdb_get_first_cpu_in_process(p); > 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); >=20=20 > void cpu_physical_memory_rw(hwaddr addr, void *buf, > hwaddr len, bool is_write); > diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h > index 16a139043f..986d8d2fa5 100644 > --- a/include/exec/gdbstub.h > +++ b/include/exec/gdbstub.h > @@ -27,6 +27,7 @@ typedef int (*gdb_set_reg_cb)(CPUArchState *env, uint8_= t *buf, int reg); > void gdb_register_coprocessor(CPUState *cpu, > gdb_get_reg_cb get_reg, gdb_set_reg_cb set= _reg, > int num_regs, const char *xml, int > g_pos); Can we have a kdoc comment here describing the function. I suspect this should be split into two patches, one for gdbstub and one for physmem. > +void gdb_unregister_coprocessor_all(CPUState *cpu); >=20=20 > /** > * gdbserver_start: start the gdb server > 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; >=20=20 > 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, >=20=20 > if (!cpu->cpu_ases) { > cpu->cpu_ases =3D g_new0(CPUAddressSpace, cpu->num_ases); > + cpu->cpu_ases_count =3D cpu->num_ases; > } >=20=20 > newas =3D &cpu->cpu_ases[asidx]; > @@ -774,6 +775,30 @@ void cpu_address_space_init(CPUState *cpu, int asidx, > } > } >=20=20 > +void cpu_address_space_destroy(CPUState *cpu, int asidx) > +{ > + CPUAddressSpace *cpuas; > + > + assert(asidx < cpu->num_ases); > + assert(asidx =3D=3D 0 || !kvm_enabled()); > + assert(cpu->cpu_ases); > + > + cpuas =3D &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 =3D=3D 1) { > + g_free(cpu->cpu_ases); > + cpu->cpu_ases =3D NULL; > + } > + > + cpu->cpu_ases_count--; > +} > + > AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx) > { > /* Return the AddressSpace corresponding to the specified index */ --=20 Alex Benn=C3=A9e Virtualisation Tech Lead @ Linaro