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bh=/zQthKHMWcaG2RmR1M0fI0NnOXqcyM7h7UEIx9SJ3no=; b=Xtd9O1aseThUM9faG18J0HpsILZUPV6+8mOKm+TgwdONCL74FuVgBAYea2+I25gwo2Dq6o 8KTYDwc7fvDztAlxeAT3kXhjA6hBDmHXG0k0LYchGjYF2Pad7eC5AlhBGsXcJlHCM2cK0o BAMckSxSAjKDIkfQES0M66+hd34ECvg= X-MC-Unique: KsX4y_-xPeev1HaOreIJDg-1 From: Igor Mammedov To: qemu-devel@nongnu.org Subject: [PATCH v5 09/10] x68: acpi: trigger SMI before sending hotplug Notify event to OSPM Date: Mon, 7 Sep 2020 07:23:47 -0400 Message-Id: <20200907112348.530921-10-imammedo@redhat.com> In-Reply-To: <20200907112348.530921-1-imammedo@redhat.com> References: <20200907112348.530921-1-imammedo@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=imammedo@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.120; envelope-from=imammedo@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/07 03:19:10 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: boris.ostrovsky@oracle.com, lersek@redhat.com, aaron.young@oracle.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" In case firmware has negotiated CPU hotplug SMI feature, generate AML to describe SMI IO port region and send SMI to firmware on each CPU hotplug SCI in case new CPUs were hotplugged. Since new CPUs can be hotplugged while CPU_SCAN_METHOD is running we can't send SMI before new CPUs are fetched from QEMU as it could cause sending Notify to a CPU that firmware hasn't seen yet. So fetch new CPUs into local cache first, then send SMI and after that send Notify events to cached CPUs. This should ensure that Notify is sent only to CPUs which were processed by firmware first. Any CPUs that were hotplugged after caching will be processed by the next CPU_SCAN_METHOD, when pending SCI is handled. Signed-off-by: Igor Mammedov Reviewed-by: Laszlo Ersek Tested-by: Laszlo Ersek --- v5: - fix hotplug on Windows when there is more than 256 possible CPUs (Windows isn't able to handle VarPackage over 255 elements so process CPUs in batches) - (Laszlo Ersek ) - fix off-by-one in package length - fix not selecting CPU before clearing insert event - use aml_lgreater() instead of aml_lnot(aml_equal(num_added_cpus, zero) - split off in separate patches: - making smi_negotiated_features a property - introduction of AcpiPmInfo.smi_on_cpuhp - introduction of PCI0.SMI0 ACPI device v2: - clear insert event after firmware has returned control from SMI. (Laszlo Ersek ) v1: - make sure that Notify is sent only to CPUs seen by FW - (Laszlo Ersek ) - use macro instead of x-smi-negotiated-features - style fixes - reserve whole SMI block (0xB2, 0xB3) v0: - s/aml_string/aml_eisaid/ /fixes Windows BSOD, on nonsense value/ (Laszlo Ersek ) - put SMI device under PCI0 like the rest of hotplug IO port - do not generate SMI AML if CPU hotplug SMI feature hasn't been negotiated --- hw/acpi/cpu.c | 156 +++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 129 insertions(+), 27 deletions(-) diff --git a/hw/acpi/cpu.c b/hw/acpi/cpu.c index 3d6a500fb7..1283972001 100644 --- a/hw/acpi/cpu.c +++ b/hw/acpi/cpu.c @@ -14,6 +14,8 @@ #define ACPI_CPU_CMD_DATA_OFFSET_RW 8 #define ACPI_CPU_CMD_DATA2_OFFSET_R 0 =20 +#define OVMF_CPUHP_SMI_CMD 4 + enum { CPHP_GET_NEXT_CPU_WITH_EVENT_CMD =3D 0, CPHP_OST_EVENT_CMD =3D 1, @@ -321,6 +323,7 @@ const VMStateDescription vmstate_cpu_hotplug =3D { #define CPU_NOTIFY_METHOD "CTFY" #define CPU_EJECT_METHOD "CEJ0" #define CPU_OST_METHOD "COST" +#define CPU_ADDED_LIST "CNEW" =20 #define CPU_ENABLED "CPEN" #define CPU_SELECTOR "CSEL" @@ -465,42 +468,141 @@ void build_cpus_aml(Aml *table, MachineState *machin= e, CPUHotplugFeatures opts, =20 method =3D aml_method(CPU_SCAN_METHOD, 0, AML_SERIALIZED); { + const uint8_t max_cpus_per_pass =3D 255; Aml *else_ctx; - Aml *while_ctx; + Aml *while_ctx, *while_ctx2; Aml *has_event =3D aml_local(0); Aml *dev_chk =3D aml_int(1); Aml *eject_req =3D aml_int(3); Aml *next_cpu_cmd =3D aml_int(CPHP_GET_NEXT_CPU_WITH_EVENT_CMD= ); + Aml *num_added_cpus =3D aml_local(1); + Aml *cpu_idx =3D aml_local(2); + Aml *uid =3D aml_local(3); + Aml *has_job =3D aml_local(4); + Aml *new_cpus =3D aml_name(CPU_ADDED_LIST); =20 aml_append(method, aml_acquire(ctrl_lock, 0xFFFF)); - aml_append(method, aml_store(one, has_event)); - while_ctx =3D aml_while(aml_equal(has_event, one)); + + /* + * Windows versions newer than XP (including Windows 10/Windows + * Server 2019), do support* VarPackageOp but, it is cripled t= o hold + * the same elements number as old PackageOp. + * For compatibility with Windows XP (so it won't crash) use A= CPI1.0 + * PackageOp which can hold max 255 elements. + * + * use named package as old Windows don't support it in local = var + */ + aml_append(method, aml_name_decl(CPU_ADDED_LIST, + aml_package(max_cpus_per_pass= ))); + + aml_append(method, aml_store(zero, uid)); + aml_append(method, aml_store(one, has_job)); + /* + * CPU_ADDED_LIST can hold limited number of elements, outer l= oop + * allows to process CPUs in batches which let us to handle mo= re + * CPUs than CPU_ADDED_LIST can hold. + */ + while_ctx2 =3D aml_while(aml_equal(has_job, one)); { - /* clear loop exit condition, ins_evt/rm_evt checks - * will set it to 1 while next_cpu_cmd returns a CPU - * with events */ - aml_append(while_ctx, aml_store(zero, has_event)); - aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd)); - ifctx =3D aml_if(aml_equal(ins_evt, one)); - { - aml_append(ifctx, - aml_call2(CPU_NOTIFY_METHOD, cpu_data, dev_chk)); - aml_append(ifctx, aml_store(one, ins_evt)); - aml_append(ifctx, aml_store(one, has_event)); - } - aml_append(while_ctx, ifctx); - else_ctx =3D aml_else(); - ifctx =3D aml_if(aml_equal(rm_evt, one)); - { - aml_append(ifctx, - aml_call2(CPU_NOTIFY_METHOD, cpu_data, eject_req)= ); - aml_append(ifctx, aml_store(one, rm_evt)); - aml_append(ifctx, aml_store(one, has_event)); - } - aml_append(else_ctx, ifctx); - aml_append(while_ctx, else_ctx); + aml_append(while_ctx2, aml_store(zero, has_job)); + + aml_append(while_ctx2, aml_store(one, has_event)); + aml_append(while_ctx2, aml_store(zero, num_added_cpus)); + + /* + * Scan CPUs, till there are CPUs with events or + * CPU_ADDED_LIST capacity is exhausted + */ + while_ctx =3D aml_while(aml_land(aml_equal(has_event, one), + aml_lless(uid, aml_int(arch_ids->len= )))); + { + /* + * clear loop exit condition, ins_evt/rm_evt checks w= ill + * set it to 1 while next_cpu_cmd returns a CPU with = events + */ + aml_append(while_ctx, aml_store(zero, has_event)); + + aml_append(while_ctx, aml_store(uid, cpu_selector)); + aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd= )); + + /* + * wrap around case, scan is complete, exit loop. + * It happens since events are not cleared in scan lo= op, + * so next_cpu_cmd continues to find already processe= d CPUs + */ + ifctx =3D aml_if(aml_lless(cpu_data, uid)); + { + aml_append(ifctx, aml_break()); + } + aml_append(while_ctx, ifctx); + + /* + * if CPU_ADDED_LIST is full, exit inner loop and pro= cess + * collected CPUs + */ + ifctx =3D aml_if( + aml_equal(num_added_cpus, aml_int(max_cpus_per_pa= ss))); + { + aml_append(ifctx, aml_store(one, has_job)); + aml_append(ifctx, aml_break()); + } + aml_append(while_ctx, ifctx); + + aml_append(while_ctx, aml_store(cpu_data, uid)); + ifctx =3D aml_if(aml_equal(ins_evt, one)); + { + /* cache added CPUs to Notify/Wakeup later */ + aml_append(ifctx, aml_store(uid, + aml_index(new_cpus, num_added_cpus))); + aml_append(ifctx, aml_increment(num_added_cpus)); + aml_append(ifctx, aml_store(one, has_event)); + } + aml_append(while_ctx, ifctx); + else_ctx =3D aml_else(); + ifctx =3D aml_if(aml_equal(rm_evt, one)); + { + aml_append(ifctx, + aml_call2(CPU_NOTIFY_METHOD, uid, eject_req)); + aml_append(ifctx, aml_store(one, rm_evt)); + aml_append(ifctx, aml_store(one, has_event)); + } + aml_append(else_ctx, ifctx); + aml_append(while_ctx, else_ctx); + aml_append(while_ctx, aml_increment(uid)); + } + aml_append(while_ctx2, while_ctx); + + /* + * in case FW negotiated ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT, + * make upcall to FW, so it can pull in new CPUs before + * OS is notified and wakes them up + */ + if (opts.smi_path) { + ifctx =3D aml_if(aml_lgreater(num_added_cpus, zero)); + { + aml_append(ifctx, aml_store(aml_int(OVMF_CPUHP_SMI= _CMD), + aml_name("%s", opts.smi_path))); + } + aml_append(while_ctx2, ifctx); + } + + /* Notify OSPM about new CPUs and clear insert events */ + aml_append(while_ctx2, aml_store(zero, cpu_idx)); + while_ctx =3D aml_while(aml_lless(cpu_idx, num_added_cpus)= ); + { + aml_append(while_ctx, + aml_store(aml_derefof(aml_index(new_cpus, cpu_idx)= ), + uid)); + aml_append(while_ctx, + aml_call2(CPU_NOTIFY_METHOD, uid, dev_chk)); + aml_append(while_ctx, aml_store(uid, aml_debug())); + aml_append(while_ctx, aml_store(uid, cpu_selector)); + aml_append(while_ctx, aml_store(one, ins_evt)); + aml_append(while_ctx, aml_increment(cpu_idx)); + } + aml_append(while_ctx2, while_ctx); } - aml_append(method, while_ctx); + aml_append(method, while_ctx2); aml_append(method, aml_release(ctrl_lock)); } aml_append(cpus_dev, method); --=20 2.27.0