From nobody Mon Feb 9 03:14:29 2026 Delivered-To: importer@patchew.org Received-SPF: none (zohomail.com: 8.43.85.245 is neither permitted nor denied by domain of lists.libvirt.org) client-ip=8.43.85.245; envelope-from=devel-bounces@lists.libvirt.org; helo=lists.libvirt.org; Authentication-Results: mx.zohomail.com; spf=none (zohomail.com: 8.43.85.245 is neither permitted nor denied by domain of lists.libvirt.org) smtp.mailfrom=devel-bounces@lists.libvirt.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.libvirt.org (lists.libvirt.org [8.43.85.245]) by mx.zohomail.com with SMTPS id 1713881957121502.7757472985928; Tue, 23 Apr 2024 07:19:17 -0700 (PDT) Received: by lists.libvirt.org (Postfix, from userid 996) id F046D214B; Tue, 23 Apr 2024 10:19:15 -0400 (EDT) Received: from lists.libvirt.org (localhost [IPv6:::1]) by lists.libvirt.org (Postfix) with ESMTP id 4C43721E8; Tue, 23 Apr 2024 10:16:44 -0400 (EDT) Received: by lists.libvirt.org (Postfix, from userid 996) id 165F71DE1; Tue, 23 Apr 2024 10:16:33 -0400 (EDT) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.libvirt.org (Postfix) with ESMTPS id 8D0761DE1 for ; Tue, 23 Apr 2024 10:16:29 -0400 (EDT) Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-443-A6VfMQlSPZmmrB59nKLLVA-1; Tue, 23 Apr 2024 10:16:27 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 83DB29D1640 for ; Tue, 23 Apr 2024 14:16:27 +0000 (UTC) Received: from maggie.brq.redhat.com (unknown [10.43.3.102]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2F9DA1121312 for ; Tue, 23 Apr 2024 14:16:27 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on lists.libvirt.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL,SPF_HELO_NONE autolearn=unavailable autolearn_force=no version=3.4.4 X-MC-Unique: A6VfMQlSPZmmrB59nKLLVA-1 From: Michal Privoznik To: devel@lists.libvirt.org Subject: [PATCH v2 3/4] virhostcpu: Introduce virHostCPUGetIsolated() Date: Tue, 23 Apr 2024 16:16:23 +0200 Message-ID: <92a5725249130a7b60a27adab3b4d8263df79176.1713881661.git.mprivozn@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.3 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Message-ID-Hash: U2V7VNVLJSRISBAC3S45NBJCLL4CO3GZ X-Message-ID-Hash: U2V7VNVLJSRISBAC3S45NBJCLL4CO3GZ X-MailFrom: mprivozn@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-config-1; header-match-config-2; header-match-config-3; header-match-devel.lists.libvirt.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; suspicious-header X-Mailman-Version: 3.2.2 Precedence: list List-Id: Development discussions about the libvirt library & tools Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="utf-8"; x-default="true" Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1713881958168100001 This is a helper that parses /sys/devices/system/cpu/isolated into a virBitmap. It's going to be needed soon. Signed-off-by: Michal Privoznik --- src/libvirt_private.syms | 1 + src/util/virhostcpu.c | 31 +++++++++++++++++++++++++++++++ src/util/virhostcpu.h | 1 + 3 files changed, 33 insertions(+) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 2c7e4b45d3..0f2d5db883 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -2504,6 +2504,7 @@ virHostCPUGetCount; virHostCPUGetCPUID; virHostCPUGetHaltPollTime; virHostCPUGetInfo; +virHostCPUGetIsolated; virHostCPUGetKVMMaxVCPUs; virHostCPUGetMap; virHostCPUGetMicrocodeVersion; diff --git a/src/util/virhostcpu.c b/src/util/virhostcpu.c index 01de69c0d1..b6d1db2302 100644 --- a/src/util/virhostcpu.c +++ b/src/util/virhostcpu.c @@ -1152,6 +1152,37 @@ virHostCPUGetAvailableCPUsBitmap(void) } =20 =20 +/** + * virHostCPUGetIsolated: + * @isolated: returned bitmap of isolated CPUs + * + * Sets @isolated to point to a bitmap of isolated CPUs (e.g. those passed= to + * isolcpus=3D kernel cmdline). If the file doesn't exist, @isolated is se= t to + * NULL and success is returned. If the file does exist but it's empty, + * @isolated is set to an empty bitmap an success is returned. + * + * Returns: 0 on success, + * -1 otherwise (with error reported). + */ +int +virHostCPUGetIsolated(virBitmap **isolated) +{ + g_autoptr(virBitmap) bitmap =3D NULL; + int rc; + + rc =3D virFileReadValueBitmapAllowEmpty(&bitmap, "%s/cpu/isolated", SY= SFS_SYSTEM_PATH); + if (rc =3D=3D -2) { + *isolated =3D NULL; + return 0; + } else if (rc < 0) { + return -1; + } + + *isolated =3D g_steal_pointer(&bitmap); + return 0; +} + + #if WITH_LINUX_KVM_H && defined(KVM_CAP_PPC_SMT) =20 /* Get the number of threads per subcore. diff --git a/src/util/virhostcpu.h b/src/util/virhostcpu.h index d7e09bff22..1f47634c33 100644 --- a/src/util/virhostcpu.h +++ b/src/util/virhostcpu.h @@ -43,6 +43,7 @@ bool virHostCPUHasBitmap(void); virBitmap *virHostCPUGetPresentBitmap(void); virBitmap *virHostCPUGetOnlineBitmap(void); virBitmap *virHostCPUGetAvailableCPUsBitmap(void); +int virHostCPUGetIsolated(virBitmap **isolated); =20 int virHostCPUGetCount(void); int virHostCPUGetThreadsPerSubcore(virArch arch) G_NO_INLINE; --=20 2.43.2 _______________________________________________ Devel mailing list -- devel@lists.libvirt.org To unsubscribe send an email to devel-leave@lists.libvirt.org