From patchwork Thu Feb 2 08:42:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Alvaro Karsz X-Patchwork-Id: 13125543 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D674AC61DA4 for ; Thu, 2 Feb 2023 08:42:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231664AbjBBImU (ORCPT ); Thu, 2 Feb 2023 03:42:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56878 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230366AbjBBImT (ORCPT ); Thu, 2 Feb 2023 03:42:19 -0500 Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4EE567DBED for ; Thu, 2 Feb 2023 00:42:18 -0800 (PST) Received: by mail-wm1-x32a.google.com with SMTP id c4-20020a1c3504000000b003d9e2f72093so3153991wma.1 for ; Thu, 02 Feb 2023 00:42:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=solid-run-com.20210112.gappssmtp.com; s=20210112; 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=gJ2h1ZaU/GcFk31wHwXi/YmcM59nhFndu/IEhvHklgU=; b=JagVYhvz8pDF2iKIQuwL52O/DMXrNq67WmS2Ysg5mBspm6Zf8s2/AQKlykE1CtDrve F0RYnEng7c0b4oazJF+xUwLeqwvyj2lYJYi+Y534DnWMgwgxSqbBOueBiCVkM/X5CPjt hnxIvTMYbUoZgPpki9SXVTpE8hvicKxkrZ964jCqnG0GflrwMvYQXDjVqrc5xgCiRDVb QadV0/HE8flOC0K3cBAFbpYqqux4xuzJiH9wttkEHnFRnS8Evz+DsdHUhy76G6c/kcUc NXxs3L4XwebUUg47uv3kfnC5ECntYGcG4t1oKc2Re7DIadqy63CoJL7jJqKouexsrAdz 2lRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=gJ2h1ZaU/GcFk31wHwXi/YmcM59nhFndu/IEhvHklgU=; b=tg7Z9MYSR8O0CuE71Q12DNvhLGbrWOotAo+qdaxg5m6ztJo9PHWlrAP9wFWgqPY7+k f1dK60dBeAl3PPWWmYMw/LkerxBb/VLA1Y+yh/k0C+az2EmSdQH8v0tdaYVB1iBHMJlC jHV4PRv2amgzcF8X7QiS4y2jchL4TPZdR7CxY2lcY8+uHWb77b4fVE6Syaq9D/jCrV73 /k1YaBzf2HF2Oo/LdtjqTwLi+/z7qtEIYkTs3lYM6VNPKd1BzgJbiFbZ3sVj9OfPTQ6P wyJb2lBQl8RaY6dn42IH7U5tdvJBajYIg1tevswj21lkW5nTXRNv+DLGiEyxC2rdFqtE nvvQ== X-Gm-Message-State: AO0yUKXIs6N13RCjOFmCNWpZr9QsO43Kq4O0yhB4IHXVctooO2Bfb87f NANaY4jUxNZxG2e0/in/o7FIhQ== X-Google-Smtp-Source: AK7set/dZBeBiTxve1zjMeO7wkX4uitN6ccr1VJ/0ayaitBMBYYqDoBhGZzUzubT3kffRhTh0I1vbA== X-Received: by 2002:a05:600c:3b9d:b0:3d2:3be4:2d9a with SMTP id n29-20020a05600c3b9d00b003d23be42d9amr5141708wms.20.1675327336811; Thu, 02 Feb 2023 00:42:16 -0800 (PST) Received: from alvaro-dell.. (bzq-84-110-153-254.static-ip.bezeqint.net. [84.110.153.254]) by smtp.gmail.com with ESMTPSA id i13-20020a1c540d000000b003db03725e86sm4170906wmb.8.2023.02.02.00.42.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Feb 2023 00:42:15 -0800 (PST) From: Alvaro Karsz To: mst@redhat.com, jasowang@redhat.com Cc: virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, netdev@vger.kernel.org, Alvaro Karsz , Eugenio Perez Martin Subject: [PATCH v2] vhost-vdpa: print warning when vhost_vdpa_alloc_domain fails Date: Thu, 2 Feb 2023 10:42:12 +0200 Message-Id: <20230202084212.1328530-1-alvaro.karsz@solid-run.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230201152018.1270226-1-alvaro.karsz@solid-run.com> References: <20230201152018.1270226-1-alvaro.karsz@solid-run.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add a print explaining why vhost_vdpa_alloc_domain failed if the device is not IOMMU cache coherent capable. Without this print, we have no hint why the operation failed. For example: $ virsh start error: Failed to start domain error: Unable to open '/dev/vhost-vdpa-' for vdpa device: Unknown error 524 Suggested-by: Eugenio Perez Martin Signed-off-by: Alvaro Karsz Acked-by: Eugenio Pérez Martin --- v2: - replace dev_err with dev_warn_once. drivers/vhost/vdpa.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 23db92388393..135f8aa70fb2 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -1151,8 +1151,11 @@ static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v) if (!bus) return -EFAULT; - if (!device_iommu_capable(dma_dev, IOMMU_CAP_CACHE_COHERENCY)) + if (!device_iommu_capable(dma_dev, IOMMU_CAP_CACHE_COHERENCY)) { + dev_warn_once(&v->dev, + "Failed to allocate domain, device is not IOMMU cache coherent capable\n"); return -ENOTSUPP; + } v->domain = iommu_domain_alloc(bus); if (!v->domain)