From nobody Mon Feb 9 17:25:11 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=quarantine dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1769491209; cv=none; d=zohomail.com; s=zohoarc; b=fyuEyHAlNxHHfydSLHcGJjRR6MNHndOzexe+d1cAAAjjQst34QngpIF8/EXCuVHHM6l9Ln18qfz7W+Xf4fclM2olivmIkqASOmhQFLjmanFxXYJJqhFyGZvcmaQ2wv8H/ukH57ITSsui3Jbf92EQ3sH2rsBz+xWUN0mlgm7BbKs= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1769491209; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=5C6sP8bU1zvxuy85CHu7c4a3R3EcqLaWP1a8seyGArg=; b=WLlajdwc8xazkHRKRKzk6/QaE0d504BeMTNUm55l921tVRs0BwE6J7yYfLnujqydgLKj20tAdCrjcVPi744LEvzMgWTBYXdtoY0d9tBvG+0R5IkR/4st+frBojBg8uqLjalGbRoKpQ+mTyaDK3sI2PL2B1Khi0INAZuzGNBzVyw= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1769491209764709.2850311706496; Mon, 26 Jan 2026 21:20:09 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vkbSg-0007jO-Sk; Tue, 27 Jan 2026 00:17:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vkbSc-0007eJ-Uf for qemu-devel@nongnu.org; Tue, 27 Jan 2026 00:17:55 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vkbSb-0000EJ-GR for qemu-devel@nongnu.org; Tue, 27 Jan 2026 00:17:54 -0500 Received: from mail-pj1-f71.google.com (mail-pj1-f71.google.com [209.85.216.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-153-v5ytG9K5MiewOoq2QYRnwA-1; Tue, 27 Jan 2026 00:17:50 -0500 Received: by mail-pj1-f71.google.com with SMTP id 98e67ed59e1d1-34cc8bf226cso5352438a91.3 for ; Mon, 26 Jan 2026 21:17:50 -0800 (PST) Received: from rhel9-box.lan ([122.163.48.79]) by smtp.googlemail.com with ESMTPSA id 98e67ed59e1d1-353f6230d5dsm1110925a91.17.2026.01.26.21.17.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jan 2026 21:17:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1769491072; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5C6sP8bU1zvxuy85CHu7c4a3R3EcqLaWP1a8seyGArg=; b=NveRxP23Idl1lUvOxb/vwfpuvrN5y7SalcEGMCquZNaoFW0Sv1+7EgHRyLVrnhojrnASCW 7gHY3cEw1Wm+cw7076E91LUmbfisneh2AlruMkL+Ss5jtSNFYvnwtFzDZ0v/DdelXpJXKc RWB9ZbjjRieGBpw7d5Gzy+rodoktYzs= X-MC-Unique: v5ytG9K5MiewOoq2QYRnwA-1 X-Mimecast-MFC-AGG-ID: v5ytG9K5MiewOoq2QYRnwA_1769491070 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1769491070; x=1770095870; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5C6sP8bU1zvxuy85CHu7c4a3R3EcqLaWP1a8seyGArg=; b=E9LOKJLJkoTu2lID+iEM8RV94Tf4dAjWgMYWMfbUr8/2zndAWPdxfl8Lo3eaAOo8NF 4G4saEsuUtDS0qbeJWP+boyz2cUNV8zxfPmTO4iC7cmUQLrICld4kHUgkiLKRi3avBfp gZhHg89QQDHOrAG2ZwcFz0id89gT+hKPesvaubfX+Vngp24Zvz6L/9hFcFVBB4/mnYxj I8NdAcVpkKm4u/3y2u1FtZtl9FvbmCWgVs6vX7D8mpizAzQdHmHUTPuNv7Hb8xfRYlIZ 1JygxO8HAYTieQGIcGNcKAShNdO+VVS8PqkXr0+Q+KL4QiVusemkI19DPma2RiwhBDC+ LVwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769491070; x=1770095870; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=5C6sP8bU1zvxuy85CHu7c4a3R3EcqLaWP1a8seyGArg=; b=ESzYONa6eosH2jEIhmKkNMVGZfnJLe5PnA8FbftYbRbCvwLJcAM6LEpyZ9uJk/0ICk Y3CMjJ37V8c15RjsbvB+taaMLQkgzEgjZNJsyJ4K4r+FKAuztZ9RJ2d2PI+JBHZLZk1n XUvYtCUMcd2o7hkNegMoULO4jrROoM3qCfvMsB+ACUKFGk8yaLC4gPeJG8qBsQe0AXml GOVbi2M+i9w//suxxrndfNvLrAfyUhrLpUO75E0JrRWqwJn2+IbVXxIfmoDXX0o4STct UB+4p08LE1X23MreCv1JQsKDvV9fm1h4WvwxY0Ze4Lj7Yuz2l+azAaSQjLbQW8Oh1zUT GeFQ== X-Forwarded-Encrypted: i=1; AJvYcCUvS+FSoXAoKeyj+2qFJa0HSsuWUBvYIKTZvtN6wnWeC2OwQaNSi46Q2sQ+lhO2w4P3VbvHjGwlyqG8@nongnu.org X-Gm-Message-State: AOJu0YztzpqBMx1//T5OSjgHsMnY+yFnwysaTR/DEHKV6Ig0YreQLKoT A77cOdF85ZzOSoeB8Fj8Zyh6cmbB8qEBQg8Nv8gFT8gXjkSy1j07t4MH5+/+cNUe0zqY+sjtRFs f/TFAIuiEkRwgOkbUzpBhyyrhfp/2k8qrK0Tb+JmvDHK310a8dBlbi3ce X-Gm-Gg: AZuq6aJ3ApPuMYUmVjX0O7jgNELKDXi38So47vv1+slyySy3KVTPcvjsoyahKa7YL2u IGT/9SG4z0m8kDe0fFts1FetXS20bFqbf4EHh9QCHly4LcM6Y1yo3S5pfrHXJFYwK13V2us2hQK 7+XeXl29POVH1YAChPU8Cky+KoaUI0qZNaY2WVVbBwUSYv68DXngbpHiMx8sRMySzFRGRRIjFiA 0SkW0ox7uFOQvsqapAQM/OZFgh4GLqBG7BkY1IK/9WjcO84Fds0pR2YVuiZrQ9MJMgN+eQhJTYU JGvzxDRKEO2cGS0kXqsUqegaJ+j9wA9LnFWBwQIZMsy3dLSOPZTw/d1yNiR2MfW48sUwp+iriAL Wxux0lJPmfu4kBaPqUPICyPyzbq1XLVoeSkm34kdOog== X-Received: by 2002:a17:90b:1e51:b0:32e:749d:fcb7 with SMTP id 98e67ed59e1d1-353fecdb174mr760701a91.13.1769491069756; Mon, 26 Jan 2026 21:17:49 -0800 (PST) X-Received: by 2002:a17:90b:1e51:b0:32e:749d:fcb7 with SMTP id 98e67ed59e1d1-353fecdb174mr760679a91.13.1769491069377; Mon, 26 Jan 2026 21:17:49 -0800 (PST) From: Ani Sinha To: "Maciej S. Szmigiero" Cc: kraxel@redhat.com, Ani Sinha , qemu-devel@nongnu.org Subject: [PATCH v3 25/33] hw/hyperv/vmbus: add support for confidential guest reset Date: Tue, 27 Jan 2026 10:45:53 +0530 Message-ID: <20260127051612.219475-26-anisinha@redhat.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20260127051612.219475-1-anisinha@redhat.com> References: <20260127051612.219475-1-anisinha@redhat.com> MIME-Version: 1.0 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=170.10.129.124; envelope-from=anisinha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-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: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1769491212229158500 Content-Type: text/plain; charset="utf-8" On confidential guests when the KVM virtual machine file descriptor changes= as a part of the reset process, event file descriptors needs to be reassociated with the new KVM VM file descriptor. This is achieved with the help of a callback handler that gets called when KVM VM file descriptor changes during the confidential guest reset process. This patch is untested on confidential guests and only exists for completen= ess. Signed-off-by: Ani Sinha --- hw/hyperv/vmbus.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/hw/hyperv/vmbus.c b/hw/hyperv/vmbus.c index c5bab5d245..ff1b6f805c 100644 --- a/hw/hyperv/vmbus.c +++ b/hw/hyperv/vmbus.c @@ -20,6 +20,7 @@ #include "hw/hyperv/vmbus-bridge.h" #include "hw/core/sysbus.h" #include "exec/cpu-common.h" +#include "system/kvm.h" #include "exec/target_page.h" #include "trace.h" =20 @@ -248,6 +249,12 @@ struct VMBus { * interrupt page */ EventNotifier notifier; + + /* + * Notifier to inform when vmfd is changed as a part of confidential g= uest + * reset mechanism. + */ + NotifierWithReturn vmbus_vmfd_change_notifier; }; =20 static bool gpadl_full(VMBusGpadl *gpadl) @@ -2347,6 +2354,32 @@ static void vmbus_dev_unrealize(DeviceState *dev) free_channels(vdev); } =20 +/* + * If the KVM fd changes because of VM reset in confidential guests, + * reassociate event fd with the new KVM fd. + */ +static int vmbus_handle_vmfd_change(NotifierWithReturn *notifier, + void *data, Error** errp) +{ + VMBus *vmbus =3D container_of(notifier, VMBus, + vmbus_vmfd_change_notifier); + int ret =3D 0; + + /* we are not interested in pre vmfd change notification */ + if (((VmfdChangeNotifier *)data)->pre) { + return 0; + } + + ret =3D hyperv_set_event_flag_handler(VMBUS_EVENT_CONNECTION_ID, + &vmbus->notifier); + /* if we are only using userland event handler, it may already exist */ + if (ret !=3D 0 && ret !=3D -EEXIST) { + error_setg(errp, "hyperv set event handler failed with %d", ret); + } + + return ret; +} + static const Property vmbus_dev_props[] =3D { DEFINE_PROP_UUID("instanceid", VMBusDevice, instanceid), }; @@ -2429,6 +2462,9 @@ static void vmbus_realize(BusState *bus, Error **errp) goto clear_event_notifier; } =20 + vmbus->vmbus_vmfd_change_notifier.notify =3D vmbus_handle_vmfd_change; + kvm_vmfd_add_change_notifier(&vmbus->vmbus_vmfd_change_notifier); + return; =20 clear_event_notifier: --=20 2.42.0