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Thu, 20 Aug 2020 14:56:38 +0000 (UTC) From: Igor Mammedov To: qemu-devel@nongnu.org Subject: [PATCH v3 1/7] x86: lpc9: let firmware negotiate 'CPU hotplug with SMI' features Date: Thu, 20 Aug 2020 10:56:35 -0400 Message-Id: <20200820145635.1305276-1-imammedo@redhat.com> In-Reply-To: <20200818122208.1243901-2-imammedo@redhat.com> References: <20200818122208.1243901-2-imammedo@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=imammedo@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=207.211.31.120; envelope-from=imammedo@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/20 08:28:03 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-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=-1, 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 Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" It will allow firmware to notify QEMU that firmware requires SMI being triggered on CPU hot[un]plug, so that it would be able to account for hotplugged CPU and relocate it to new SMM base and/or safely remove CPU on unplug. Using negotiated features, follow up patches will insert SMI upcall into AML code, to make sure that firmware processes hotplug before guest OS would attempt to use new CPU. Signed-off-by: Igor Mammedov --- v3: - rebase on top of "[PATCH v2] hw: add compat machines for 5.2" so apply that before this patch v2: - rebase on top of 5.1 (move compat values to 5.1 machine) - make "x-smi-cpu-hotunplug" false by default (Laszlo Ersek ) --- include/hw/i386/ich9.h | 2 ++ hw/i386/pc.c | 4 +++- hw/i386/pc_piix.c | 1 + hw/i386/pc_q35.c | 1 + hw/isa/lpc_ich9.c | 13 +++++++++++++ 5 files changed, 20 insertions(+), 1 deletion(-) diff --git a/include/hw/i386/ich9.h b/include/hw/i386/ich9.h index a98d10b252..d1bb3f7bf0 100644 --- a/include/hw/i386/ich9.h +++ b/include/hw/i386/ich9.h @@ -247,5 +247,7 @@ typedef struct ICH9LPCState { /* bit positions used in fw_cfg SMI feature negotiation */ #define ICH9_LPC_SMI_F_BROADCAST_BIT 0 +#define ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT 1 +#define ICH9_LPC_SMI_F_CPU_HOT_UNPLUG_BIT 2 #endif /* HW_ICH9_H */ diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 9aa813949c..583db11d28 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -97,7 +97,9 @@ #include "fw_cfg.h" #include "trace.h" -GlobalProperty pc_compat_5_1[] = {}; +GlobalProperty pc_compat_5_1[] = { + { "ICH9-LPC", "x-smi-cpu-hotplug", "off" }, +}; const size_t pc_compat_5_1_len = G_N_ELEMENTS(pc_compat_5_1); GlobalProperty pc_compat_5_0[] = { diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c index c5ba70ca17..68f8ba1bf9 100644 --- a/hw/i386/pc_piix.c +++ b/hw/i386/pc_piix.c @@ -433,6 +433,7 @@ static void pc_i440fx_5_2_machine_options(MachineClass *m) m->alias = "pc"; m->is_default = true; pcmc->default_cpu_version = 1; + compat_props_add(m->compat_props, pc_compat_5_1, pc_compat_5_1_len); } DEFINE_I440FX_MACHINE(v5_2, "pc-i440fx-5.2", NULL, diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c index 0cb9c18cd4..b729cf9a58 100644 --- a/hw/i386/pc_q35.c +++ b/hw/i386/pc_q35.c @@ -359,6 +359,7 @@ static void pc_q35_5_2_machine_options(MachineClass *m) pc_q35_machine_options(m); m->alias = "q35"; pcmc->default_cpu_version = 1; + compat_props_add(m->compat_props, pc_compat_5_1, pc_compat_5_1_len); } DEFINE_Q35_MACHINE(v5_2, "pc-q35-5.2", NULL, diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c index cd6e169d47..19f32bed3e 100644 --- a/hw/isa/lpc_ich9.c +++ b/hw/isa/lpc_ich9.c @@ -373,6 +373,15 @@ static void smi_features_ok_callback(void *opaque) /* guest requests invalid features, leave @features_ok at zero */ return; } + if (!(guest_features & BIT_ULL(ICH9_LPC_SMI_F_BROADCAST_BIT)) && + guest_features & (BIT_ULL(ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT) | + BIT_ULL(ICH9_LPC_SMI_F_CPU_HOT_UNPLUG_BIT))) { + /* + * cpu hot-[un]plug with SMI requires SMI broadcast, + * leave @features_ok at zero + */ + return; + } /* valid feature subset requested, lock it down, report success */ lpc->smi_negotiated_features = guest_features; @@ -747,6 +756,10 @@ static Property ich9_lpc_properties[] = { DEFINE_PROP_BOOL("noreboot", ICH9LPCState, pin_strap.spkr_hi, true), DEFINE_PROP_BIT64("x-smi-broadcast", ICH9LPCState, smi_host_features, ICH9_LPC_SMI_F_BROADCAST_BIT, true), + DEFINE_PROP_BIT64("x-smi-cpu-hotplug", ICH9LPCState, smi_host_features, + ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT, true), + DEFINE_PROP_BIT64("x-smi-cpu-hotunplug", ICH9LPCState, smi_host_features, + ICH9_LPC_SMI_F_CPU_HOT_UNPLUG_BIT, false), DEFINE_PROP_END_OF_LIST(), }; -- 2.26.2