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bh=i8i04RflSSAEa8AF3BhF/y7h5IJuR6XGASJTy9nNJmQ=; b=NG+xBg+yrsIieyG/EQB2yGezWk+Z0CgVxNH1JMcKmvaFyZnxDTj9ME29gaEHDDCTKEZ+ih kP0yP+YWbKQPMHYp1/EJpY9/tH/2VdAYkA6b2vTUtIIf2Bw5Laq2cuKgfiDS47QnNwApzc iqMXiKAsMaLTn2g4EenguMAhL+PNd4U= X-MC-Unique: M3kV4D0TNiu3P2N9YWYgFw-1 From: Igor Mammedov To: qemu-devel@nongnu.org Subject: [PATCH v6 03/11] x86: cpuhp: refuse cpu hot-unplug request earlier if not supported Date: Wed, 23 Sep 2020 05:46:42 -0400 Message-Id: <20200923094650.1301166-4-imammedo@redhat.com> In-Reply-To: <20200923094650.1301166-1-imammedo@redhat.com> References: <20200923094650.1301166-1-imammedo@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=imammedo@redhat.com X-Mimecast-Spam-Score: 0 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; 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charset="utf-8" CPU hot-unplug with SMM requires firmware participation to prevent guest crash (i.e. CPU can be removed only after OS _and_ firmware were prepared for the action). Previous patches introduced ICH9_LPC_SMI_F_CPU_HOT_UNPLUG_BIT feature bit, which is advertised by firmware when it has support for CPU hot-unplug. Use it to check if guest is able to handle unplug and make device_del fail gracefully if hot-unplug feature hasn't been negotiated. Signed-off-by: Igor Mammedov Tested-by: Laszlo Ersek Reviewed-by: Laszlo Ersek --- v2: - fix typo in commit message - drop 5.1 version from hint message (Laszlo) --- hw/acpi/ich9.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c index 0acc9a3107..95cb0f935b 100644 --- a/hw/acpi/ich9.c +++ b/hw/acpi/ich9.c @@ -460,6 +460,18 @@ void ich9_pm_device_unplug_request_cb(HotplugHandler *= hotplug_dev, errp); } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) && !lpc->pm.cpu_hotplug_legacy) { + uint64_t negotiated =3D lpc->smi_negotiated_features; + + if (negotiated & BIT_ULL(ICH9_LPC_SMI_F_BROADCAST_BIT) && + !(negotiated & BIT_ULL(ICH9_LPC_SMI_F_CPU_HOT_UNPLUG_BIT))) { + error_setg(errp, "cpu hot-unplug with SMI wasn't enabled " + "by firmware"); + error_append_hint(errp, "update machine type to a version havi= ng " + "x-smi-cpu-hotunplug=3Don and firmware= that " + "supports CPU hot-unplug with SMM"); + return; + } + acpi_cpu_unplug_request_cb(hotplug_dev, &lpc->pm.cpuhp_state, dev, errp); } else { --=20 2.27.0