From nobody Sun Oct 26 05:25:20 2025 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=1760625660; cv=none; d=zohomail.com; s=zohoarc; b=MBPcnfuRD5B012fVeMw+jq4svG+TSGQy7fbPZentluiQaB1LGm9L+0+d2mKK76U5wxl8QFBQY5WLUFosdATEs0tWcbakXUPnYwIADlo9Fk+JPcboW1UOiPS//PW+OSq3DLWr1NJZSPGz1duV9MzU7fkb3mgcqH218VWfMQTx66k= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1760625660; 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=/ShBJd7pr2QL1+bDad9zH4M11TP2RGj4jPPtrOcO4qo=; b=HS3e/I5sliBwWiXq16MbqPY98j/N+rzpE8cSy/0oIQuh0xOp6AfTuQ8XJ1FogAws+jtlndNiSmCNaQ0i4SocKc0t+49g4dpJq8ZnkfaaULKKh4rDvC8Ancx6OWapDtig+HZyiAkbMOUxEZJmZrNPTaE8HgwnHVRPviM0SFZBWDs= 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 1760625660845369.40780235224724; Thu, 16 Oct 2025 07:41:00 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1v9P8Q-0008Ia-8b; Thu, 16 Oct 2025 10:39:18 -0400 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 1v9P8N-0008IM-8c for qemu-devel@nongnu.org; Thu, 16 Oct 2025 10:39:15 -0400 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 1v9P8F-0005RD-Bx for qemu-devel@nongnu.org; Thu, 16 Oct 2025 10:39:14 -0400 Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-49-8tCOJCdTOxyCoIpI8IgOIw-1; Thu, 16 Oct 2025 10:39:02 -0400 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (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 mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0998219560B7; Thu, 16 Oct 2025 14:39:01 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.45.225.164]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 06BF1180044F; Thu, 16 Oct 2025 14:38:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1760625545; 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=/ShBJd7pr2QL1+bDad9zH4M11TP2RGj4jPPtrOcO4qo=; b=JlSlbOwAFqchzuzwKzc8cNk11QI+Otqcckb1zOI70IAsVlAwllWoTgnQaphPqHN37BmDcw YhCzNBD7K+gehb7jWi3ElN1T3cNtmTbV7E8XbM1xnYq6pP/AOOixIsfIYGCtmBqlf5F7wh l9CYFExl+9PGNDrYxe01wrxthlRXzVc= X-MC-Unique: 8tCOJCdTOxyCoIpI8IgOIw-1 X-Mimecast-MFC-AGG-ID: 8tCOJCdTOxyCoIpI8IgOIw_1760625541 From: Albert Esteve To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , hi@alyssa.is, stefanha@redhat.com, david@redhat.com, jasowang@redhat.com, dbassey@redhat.com, stevensd@chromium.org, Stefano Garzarella , Laurent Vivier , "Michael S. Tsirkin" , Paolo Bonzini , Fabiano Rosas , slp@redhat.com, manos.pitsidianakis@linaro.org, Albert Esteve Subject: [PATCH v10 4/7] vhost_user: Add frontend get_shmem_config command Date: Thu, 16 Oct 2025 16:38:24 +0200 Message-ID: <20251016143827.1850397-5-aesteve@redhat.com> In-Reply-To: <20251016143827.1850397-1-aesteve@redhat.com> References: <20251016143827.1850397-1-aesteve@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 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=aesteve@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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, T_SPF_TEMPERROR=0.01 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: 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: 1760625662714154100 Content-Type: text/plain; charset="utf-8" The frontend can use this command to retrieve VirtIO Shared Memory Regions configuration from the backend. The response contains the number of shared memory regions, their size, and shmid. This is useful when the frontend is unaware of specific backend type and configuration, for example, in the `vhost-user-device` case. Reviewed-by: Stefan Hajnoczi Signed-off-by: Albert Esteve --- include/hw/virtio/vhost-backend.h | 10 ++++++++++ include/hw/virtio/vhost-user.h | 1 + include/hw/virtio/virtio.h | 2 ++ 3 files changed, 13 insertions(+) diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-ba= ckend.h index ff94fa1734..ce58b4d2d6 100644 --- a/include/hw/virtio/vhost-backend.h +++ b/include/hw/virtio/vhost-backend.h @@ -163,6 +163,15 @@ typedef int (*vhost_set_device_state_fd_op)(struct vho= st_dev *dev, int *reply_fd, Error **errp); typedef int (*vhost_check_device_state_op)(struct vhost_dev *dev, Error **= errp); +/* + * Max regions is VIRTIO_MAX_SHMEM_REGIONS, so that is the maximum + * number of memory_sizes that will be accepted. + */ +typedef int (*vhost_get_shmem_config_op)(struct vhost_dev *dev, + int *nregions, + uint64_t *memory_sizes, + Error **errp); + =20 typedef struct VhostOps { VhostBackendType backend_type; @@ -220,6 +229,7 @@ typedef struct VhostOps { vhost_supports_device_state_op vhost_supports_device_state; vhost_set_device_state_fd_op vhost_set_device_state_fd; vhost_check_device_state_op vhost_check_device_state; + vhost_get_shmem_config_op vhost_get_shmem_config; } VhostOps; =20 int vhost_backend_update_device_iotlb(struct vhost_dev *dev, diff --git a/include/hw/virtio/vhost-user.h b/include/hw/virtio/vhost-user.h index 9a3f238b43..bacc7d184c 100644 --- a/include/hw/virtio/vhost-user.h +++ b/include/hw/virtio/vhost-user.h @@ -32,6 +32,7 @@ enum VhostUserProtocolFeature { /* Feature 17 reserved for VHOST_USER_PROTOCOL_F_XEN_MMAP. */ VHOST_USER_PROTOCOL_F_SHARED_OBJECT =3D 18, VHOST_USER_PROTOCOL_F_DEVICE_STATE =3D 19, + VHOST_USER_PROTOCOL_F_SHMEM =3D 20, VHOST_USER_PROTOCOL_F_MAX }; =20 diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 3f6dfba321..bd6b16733d 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -82,6 +82,8 @@ typedef struct VirtQueueElement =20 #define VIRTIO_NO_VECTOR 0xffff =20 +#define VIRTIO_MAX_SHMEM_REGIONS 256 + /* special index value used internally for config irqs */ #define VIRTIO_CONFIG_IRQ_IDX -1 =20 --=20 2.49.0