From nobody Mon Feb 9 10:32:45 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1570644711; cv=none; d=zoho.com; s=zohoarc; b=OfXGCnG6VNvKNLFce3Irht6a5MvRKQNuwEDj2SXb5ejQ5td+e6jgbhfwGabxgsJWsHL4/IrxGbMCbh892NnQX1FYiWVzvhADcDekJ9qZAyv9eyjsc+0bGuap3YEGjK0RKdUmndomCYIl+Pw7lJ6nTR9SibmGPVHHb19tDso1+30= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1570644711; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=y57s929sKnPGzR8mS6oEokR+fMEiXPEy+q55dM2RKZA=; b=j26CMssy4MK4MjsarntfPWIcC9RnGf4wUJiqQ3Hq8l02qrtIpEdcMHPYmTPVhPEjvPZ76KACZU74k2rYlZWjnNj10/laufiGS6dX53p6U5fRMEeTNayzp2VSeyoF+kXZb9H3t1PuzAKKU0177cPlP1J9yfIwMgRSoZpX2gKTpYQ= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1570644711753270.58339062715675; Wed, 9 Oct 2019 11:11:51 -0700 (PDT) Received: from localhost ([::1]:53606 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iIGRC-0007ke-6z for importer@patchew.org; Wed, 09 Oct 2019 14:11:50 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46322) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iIBvs-0002nT-SI for qemu-devel@nongnu.org; Wed, 09 Oct 2019 09:23:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iIBvr-0001LV-KX for qemu-devel@nongnu.org; Wed, 09 Oct 2019 09:23:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48242) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iIBvr-0001LQ-Cu for qemu-devel@nongnu.org; Wed, 09 Oct 2019 09:23:11 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A1E6E10C094D; Wed, 9 Oct 2019 13:23:10 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq.redhat.com (dell-r430-03.lab.eng.brq.redhat.com [10.37.153.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 02CF35C1D6; Wed, 9 Oct 2019 13:23:08 +0000 (UTC) From: Igor Mammedov To: qemu-devel@nongnu.org Subject: [RFC 3/3] acpi: cpuhp: add CPHP_GET_CPU_ID_CMD command Date: Wed, 9 Oct 2019 09:22:52 -0400 Message-Id: <20191009132252.17860-4-imammedo@redhat.com> In-Reply-To: <20191009132252.17860-1-imammedo@redhat.com> References: <20191009132252.17860-1-imammedo@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.66]); Wed, 09 Oct 2019 13:23:10 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 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: Eduardo Habkost , "Michael S. Tsirkin" , Laszlo Ersek , Gerd Hoffmann , Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Extend CPU hotplug interface to return architecture specific identifier for current CPU (in case of x86, it's APIC ID). Signed-off-by: Igor Mammedov --- TODO: * cripple it to behave old way on old machine types so that new firmware started on new QEMU won't see a difference when migrated to an old QEMU (i.e. QEMU that doesn't support this command) --- docs/specs/acpi_cpu_hotplug.txt | 10 +++++++++- hw/acpi/cpu.c | 15 +++++++++++++++ hw/acpi/trace-events | 1 + 3 files changed, 25 insertions(+), 1 deletion(-) diff --git a/docs/specs/acpi_cpu_hotplug.txt b/docs/specs/acpi_cpu_hotplug.= txt index 43c5a193f0..0438678249 100644 --- a/docs/specs/acpi_cpu_hotplug.txt +++ b/docs/specs/acpi_cpu_hotplug.txt @@ -32,7 +32,9 @@ Register block size: =20 read access: offset: - [0x0-0x3] reserved + [0x0-0x3] Command data 2: (DWORD access) + upper 32 bit of 'Command data' if returned data value is 64 = bit. + in case of error or unsupported command reads is 0x0 [0x4] CPU device status fields: (1 byte access) bits: 0: Device is enabled and may be used by guest @@ -87,6 +89,8 @@ write access: 2: stores value into OST status register, triggers ACPI_DEVICE_OST QMP event from QEMU to external applicati= ons with current values of OST event and status registers. + 3: OSPM reads architecture specific value identifying CPU + (x86: APIC ID) other values: reserved =20 Selecting CPU device beyond possible range has no effect on platform: @@ -115,3 +119,7 @@ Typical usecases: 5.2 if 'Command data' register has not changed, there is not CPU corresponding to iterator value and the last valid iterator value equals to 'max_cpus' + 1 + - Get architecture specific id for a CPU + 1. pick a CPU to read from using 'CPU selector' register + 2. write 0x3 int0 'Command field' register + 3. read architecture specific id from 'Command data' register diff --git a/hw/acpi/cpu.c b/hw/acpi/cpu.c index 87f30a31d7..701542d860 100644 --- a/hw/acpi/cpu.c +++ b/hw/acpi/cpu.c @@ -12,11 +12,13 @@ #define ACPI_CPU_FLAGS_OFFSET_RW 4 #define ACPI_CPU_CMD_OFFSET_WR 5 #define ACPI_CPU_CMD_DATA_OFFSET_RW 8 +#define ACPI_CPU_CMD_DATA2_OFFSET_RW 0 =20 enum { CPHP_GET_NEXT_CPU_WITH_EVENT_CMD =3D 0, CPHP_OST_EVENT_CMD =3D 1, CPHP_OST_STATUS_CMD =3D 2, + CPHP_GET_CPU_ID_CMD =3D 3, CPHP_CMD_MAX }; =20 @@ -74,11 +76,24 @@ static uint64_t cpu_hotplug_rd(void *opaque, hwaddr add= r, unsigned size) case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD: val =3D cpu_st->selector; break; + case CPHP_GET_CPU_ID_CMD: + val =3D cpu_to_le64(cdev->arch_id) & 0xFFFFFFFF; + break; default: break; } trace_cpuhp_acpi_read_cmd_data(cpu_st->selector, val); break; + case ACPI_CPU_CMD_DATA2_OFFSET_RW: + switch (cpu_st->command) { + case CPHP_GET_CPU_ID_CMD: + val =3D cpu_to_le64(cdev->arch_id) >> 32; + break; + default: + break; + } + trace_cpuhp_acpi_read_cmd_data2(cpu_st->selector, val); + break; default: break; } diff --git a/hw/acpi/trace-events b/hw/acpi/trace-events index 96b8273297..afbc77de1c 100644 --- a/hw/acpi/trace-events +++ b/hw/acpi/trace-events @@ -23,6 +23,7 @@ cpuhp_acpi_read_flags(uint32_t idx, uint8_t flags) "idx[0= x%"PRIx32"] flags: 0x%" cpuhp_acpi_write_idx(uint32_t idx) "set active cpu idx: 0x%"PRIx32 cpuhp_acpi_write_cmd(uint32_t idx, uint8_t cmd) "idx[0x%"PRIx32"] cmd: 0x%= "PRIx8 cpuhp_acpi_read_cmd_data(uint32_t idx, uint32_t data) "idx[0x%"PRIx32"] da= ta: 0x%"PRIx32 +cpuhp_acpi_read_cmd_data2(uint32_t idx, uint32_t data) "idx[0x%"PRIx32"] d= ata: 0x%"PRIx32 cpuhp_acpi_cpu_has_events(uint32_t idx, bool ins, bool rm) "idx[0x%"PRIx32= "] inserting: %d, removing: %d" cpuhp_acpi_clear_inserting_evt(uint32_t idx) "idx[0x%"PRIx32"]" cpuhp_acpi_clear_remove_evt(uint32_t idx) "idx[0x%"PRIx32"]" --=20 2.18.1