From patchwork Wed Jun 5 23:34:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 1944358 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=YDHkkQcj; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4VvkQG2Dtzz20Q6 for ; Thu, 6 Jun 2024 09:37:10 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sF09o-0002qt-3I; Wed, 05 Jun 2024 19:35:04 -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 1sF09m-0002qO-5H for qemu-devel@nongnu.org; Wed, 05 Jun 2024 19:35:02 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sF09k-0004pA-J7 for qemu-devel@nongnu.org; Wed, 05 Jun 2024 19:35:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1717630499; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rU41nJqg3mDUGH1bcBpKF5g1VLC3bOtqyqIezIWqM9s=; b=YDHkkQcjCxi0uFckLXkFl5QpellKuftC/IqcrXaGy+AuA8aIuiW72WgGM+77dClDF8NLRH rTF7AsKToFFeRDGrRwCv0kQnUX3mmgREbJx0dWEsGxW0jIHeEPaMM1oEmVT4PQ8Z6/DX4Z vUe+6UzDegm7P/jASLidcgM8c/BQRiI= Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-256--swm5-G7OJyAlTqJ1hubEQ-1; Wed, 05 Jun 2024 19:34:58 -0400 X-MC-Unique: -swm5-G7OJyAlTqJ1hubEQ-1 Received: by mail-ed1-f72.google.com with SMTP id 4fb4d7f45d1cf-57a32f2f782so79340a12.1 for ; Wed, 05 Jun 2024 16:34:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717630496; x=1718235296; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=rU41nJqg3mDUGH1bcBpKF5g1VLC3bOtqyqIezIWqM9s=; b=fgRVbLUFxGobH26AvWwAgDa/tn+0Aej9Cby7YSC2LP5cDnqgIrWNrnyt50aVnGxXPH uBkmiryXS7iaBmV+4qAdQiCMhC3clkZxJJoYC6w+hRpbUb8OcB4CQFJRHZwOKcxe9Lzv FtyaSOsyeuxc27b1foun5aJvig/i2PaDqnq4+2CoCaASFeeH4MHs3PAkFsnpsSFKwxet T8RN5MPM0vtpXFkkWD9fLGyrTQ1MrFo7oGnj4VMIzQ6zhXdy3EGIkVQjyBFzEwkXjhdJ Fl2FMHb0Vm9FUo4t6m519Zhc26Fk4LLTqZkqqDV8SSU6Yy1/TAjjk8mW2D9/xhMQl9Hx AYrA== X-Gm-Message-State: AOJu0YxfI9owl0/mjNiGvY1pGYz8Yo1aOlEPm/OlhGuLlI1X10HvYzEQ wF1rssxg+IMtvhKUyiN932flRu8dlRku53twkhfRWc9QQypTl3ELwHsJIXjZrJIO9+EAPG659r1 9mBVojIi2MvCET1mBT/YtdlzyCRwZRSDHUK1pvi4xCfZ6M3mUT5DClqALd/qgSpC2KTVXY00YiG i+PDLBwZLXKCFnBdWMlvEX5X+y4zE+Jw== X-Received: by 2002:a50:cd10:0:b0:57a:3357:5967 with SMTP id 4fb4d7f45d1cf-57a8bc9f858mr2411428a12.30.1717630496446; Wed, 05 Jun 2024 16:34:56 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGMgv2ZpIyUyXfJqvPhlWngNJwMCoAUIFMvG+vfHkCxWi4UXIr2W3HFnv9tCefxMfWqLMCZBg== X-Received: by 2002:a50:cd10:0:b0:57a:3357:5967 with SMTP id 4fb4d7f45d1cf-57a8bc9f858mr2411422a12.30.1717630495960; Wed, 05 Jun 2024 16:34:55 -0700 (PDT) Received: from redhat.com ([2.55.56.67]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-57aae0c9f88sm99816a12.21.2024.06.05.16.34.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Jun 2024 16:34:55 -0700 (PDT) Date: Wed, 5 Jun 2024 19:34:53 -0400 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Cc: Peter Maydell , Jonah Palmer , Eugenio =?utf-8?b?UMOpcmV6?= Subject: [PULL v3 04/41] virtio/virtio-pci: Handle extra notification data Message-ID: <2e169a5bc1e75cda7075401ae9ee7e4d28a4df31.1717630437.git.mst@redhat.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent Received-SPF: pass client-ip=170.10.133.124; envelope-from=mst@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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Jonah Palmer Add support to virtio-pci devices for handling the extra data sent from the driver to the device when the VIRTIO_F_NOTIFICATION_DATA transport feature has been negotiated. The extra data that's passed to the virtio-pci device when this feature is enabled varies depending on the device's virtqueue layout. In a split virtqueue layout, this data includes: - upper 16 bits: shadow_avail_idx - lower 16 bits: virtqueue index In a packed virtqueue layout, this data includes: - upper 16 bits: 1-bit wrap counter & 15-bit shadow_avail_idx - lower 16 bits: virtqueue index Signed-off-by: Jonah Palmer Message-Id: <20240315165557.26942-2-jonah.palmer@oracle.com> Reviewed-by: Eugenio Pérez Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/virtio/virtio.h | 2 ++ hw/virtio/virtio-pci.c | 12 +++++++++--- hw/virtio/virtio.c | 18 ++++++++++++++++++ 3 files changed, 29 insertions(+), 3 deletions(-) diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index 7d5ffdc145..1451926a13 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -307,6 +307,8 @@ int virtio_queue_ready(VirtQueue *vq); int virtio_queue_empty(VirtQueue *vq); +void virtio_queue_set_shadow_avail_idx(VirtQueue *vq, uint16_t idx); + /* Host binding interface. */ uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr); diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index b1d02f4b3d..cffc7efcae 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -384,7 +384,7 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) { VirtIOPCIProxy *proxy = opaque; VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); - uint16_t vector; + uint16_t vector, vq_idx; hwaddr pa; switch (addr) { @@ -408,8 +408,14 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) vdev->queue_sel = val; break; case VIRTIO_PCI_QUEUE_NOTIFY: - if (val < VIRTIO_QUEUE_MAX) { - virtio_queue_notify(vdev, val); + vq_idx = val; + if (vq_idx < VIRTIO_QUEUE_MAX && virtio_queue_get_num(vdev, vq_idx)) { + if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) { + VirtQueue *vq = virtio_get_queue(vdev, vq_idx); + + virtio_queue_set_shadow_avail_idx(vq, val >> 16); + } + virtio_queue_notify(vdev, vq_idx); } break; case VIRTIO_PCI_STATUS: diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 893a072c9d..f7c99e3a96 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2264,6 +2264,24 @@ void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) } } +void virtio_queue_set_shadow_avail_idx(VirtQueue *vq, uint16_t shadow_avail_idx) +{ + if (!vq->vring.desc) { + return; + } + + /* + * 16-bit data for packed VQs include 1-bit wrap counter and + * 15-bit shadow_avail_idx. + */ + if (virtio_vdev_has_feature(vq->vdev, VIRTIO_F_RING_PACKED)) { + vq->shadow_avail_wrap_counter = (shadow_avail_idx >> 15) & 0x1; + vq->shadow_avail_idx = shadow_avail_idx & 0x7FFF; + } else { + vq->shadow_avail_idx = shadow_avail_idx; + } +} + static void virtio_queue_notify_vq(VirtQueue *vq) { if (vq->vring.desc && vq->handle_output) {