From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 636D8398F85 for ; Thu, 4 Dec 2025 01:33:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764812012; cv=none; b=UGkjvVaK7gK6Re2pgwqNDlCzTLCrxwlObrC7Vr0hkr944cmhkRmm02jRebtIohc0KojuyWENPV/juaNfvJo8tfGSi5Hnztyw8/QWfLDsz5d/V110oy0e/v24sdQ1SjGhNg2RNqq6Uxj7HBu83FAkkBAlbROGVCP7xTDf3V/VIRc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764812012; c=relaxed/simple; bh=xQEchCyS/SDzra4Ea9JG9KXn1RKa+px7wYeOBNUrWJA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=feKMDNgrn38CCOHtMHj27BEJeTI6CUWX+eyjrVe/DocQg+AwtbDVfhFhWnB4p0x+2sgAg8CAppjnfNEQaLDyvTHErV/MT3O2YvbpkTqJZX3QSr0x+eM+wOQxWfcki9it3cLgGnVubRqXp4345H9mpPQ6ICqO3wmEyeApmyGR/Wo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=nrfLeL/c; arc=none smtp.client-ip=209.85.214.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nrfLeL/c" Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-297f35be2ffso6190765ad.2 for ; Wed, 03 Dec 2025 17:33:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1764812011; x=1765416811; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=1OLjEC1FU02v8o2+aL765z3ax4u9Wn8i4cyPIqv2NWg=; b=nrfLeL/c5wd6vYAIBlU6lisqNesZ540v0bB2z1KeCVkIxGmUMJ9TpGlNFRfroGO6rJ 0Fdka5I4+upGA+rQ5sChFYZPTEYghHO+FfIUrAL4NvkB5NuaAKz13pND6Kbl7Y8joLpF fSKIpaXr5Jkx6ehB3t+F8qY8tRVRm1lZ2ADCrTujFBd9YZJyFo3tv4QfEZ+DEUmZy6a7 deBFyQR0UySwbz04yuncepGpMcQGNk8HEBLuRADAE040zGUJmixIyZv0sKEP/QsQ5WAO ZAUEJzlt05SWYAzkfhAlG43Wvab9b+euDue30ccbE4EUnEfxEHc3iQ82yO1pFFgRnxDT Xiuw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764812011; x=1765416811; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=1OLjEC1FU02v8o2+aL765z3ax4u9Wn8i4cyPIqv2NWg=; b=G4wF7PxMgGrUvrvi+TSK6f/nGCvb8CtEFMy5TraoTWijX5pu/is6PNPpbxVKqW442o hwoz3WEEKA+E75/NEqXngz9dhk6wwXNZcunVEUtQf/RNi6+d8IofitY94bUoAw/qLJIP JqM+dn3QxIlKLq0psijPcJj8KQpLZDlxZ0veWJeP+91ZUQG5WWjwPXDjcgRFm4Xm+xjj P4VyJfZo6fiXcQOQYbuj8OSQsi6UBdx4dGwIfuSRBpidKyOb6CLddYmjLu/kCX8WJuFL Mn0r4azce5RELjQHnthf215KeHvYl13Etomyfx4XW59imbtUGUOOBL93YZDiiy9x4ZFc lSjA== X-Forwarded-Encrypted: i=1; AJvYcCXTgRMLjlaN+oxxrmCnQK8g43oIF1IqaqHEQ9rtUEsLQZeIOMRh+liRaPIQA3DiNrXve+qLKTR2L7MReq8=@vger.kernel.org X-Gm-Message-State: AOJu0YxV8CwOIoDaVbG9d6up5YErit9CSQDWcSVCdQOItBFwkIJ2JQfr zv9qO789KjT0pzrgjn9dXHVVwd7JVhqiRBakTgYhUatw07kC6flbVGvR X-Gm-Gg: ASbGnct+7zketL05WTAmXd8RuuWDBWey8SgehoUEwELxuRQBp/GA4gdIcywSwrjkksT DrKsi4sIs1TrdSOkvqI2Bhm+3/OEdiWfORJQ/uokaa4LNNDtLD4xC8OCWMA0AXbxepsx3kUutwf MSpqBT25w4HHsNqPJU0FjPQY9G1lSLVbPpAQhFFOFnT7st+SVZCXap7P8urR8JKVZsiU59eCM6l 0d/JyB3BKgQdbmytMS+j5DQYRg+pVptCQLYN6uIfL3AbTWzeJL4Bz9xHP55qvmz6gdhaQ7v5JQx 0jplH0m3VeJMv4u8U9R/JjahEPCVhkmO2DWDUVWpqCzfgBwIdj2nCPvOd1gm03qYRG9g34R6VdQ 677Fib2UOzguSCcYxHFnwDbxGedUCKUBSIvqpLvc0mPlLY8PayjUva7e2i5K33XXlcduT+gcaQi Eo0u2qHXUdkfTspQBAgE0rMd1QVa4yMMLdXoQS1hi7EGOY7A== X-Google-Smtp-Source: AGHT+IE8Rvg94sCmcdZ3rOlKWQaPxgdUe5bYjXp+akgFFnSeqWM9ehkwCxofj9csZW166RntHbw50g== X-Received: by 2002:a17:903:19e4:b0:295:8c80:fb94 with SMTP id d9443c01a7336-29d683e1cacmr50148045ad.59.1764812010639; Wed, 03 Dec 2025 17:33:30 -0800 (PST) Received: from ?IPV6:2601:1c0:5102:8330:1273:9a5a:e6fa:1903? ([2601:1c0:5102:8330:1273:9a5a:e6fa:1903]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29dae4cf98bsm1860585ad.36.2025.12.03.17.33.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 03 Dec 2025 17:33:30 -0800 (PST) Message-ID: Date: Wed, 3 Dec 2025 17:33:26 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 4/4] vfio/xe: Add device specific vfio_pci driver variant for Intel graphics To: =?UTF-8?Q?Micha=C5=82_Winiarski?= , Alex Williamson , Lucas De Marchi , =?UTF-8?Q?Thomas_Hellstr=C3=B6m?= , Rodrigo Vivi , Jason Gunthorpe , Yishai Hadas , Kevin Tian , Shameer Kolothum , intel-xe@lists.freedesktop.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Matthew Brost , Michal Wajdeczko Cc: dri-devel@lists.freedesktop.org, Jani Nikula , Joonas Lahtinen , Tvrtko Ursulin , David Airlie , Simona Vetter , Lukasz Laguna , Christoph Hellwig References: <20251127093934.1462188-1-michal.winiarski@intel.com> <20251127093934.1462188-5-michal.winiarski@intel.com> Content-Language: en-US From: Angela In-Reply-To: <20251127093934.1462188-5-michal.winiarski@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 11/27/25 01:39, Michał Winiarski wrote: [snip] > +static void xe_vfio_pci_reset_done(struct pci_dev *pdev) > +{ > + struct xe_vfio_pci_core_device *xe_vdev = pci_get_drvdata(pdev); > + int ret; > + > + if (!pdev->is_virtfn) > + return; > + > + /* > + * VF FLR requires additional processing done by PF driver. > + * The processing is done after FLR is already finished from PCIe > + * perspective. > + * In order to avoid a scenario where VF is used while PF processing > + * is still in progress, additional synchronization point is needed. > + */ > + ret = xe_sriov_vfio_wait_flr_done(xe_vdev->xe, xe_vdev->vfid); > + if (ret) > + dev_err(&pdev->dev, "Failed to wait for FLR: %d\n", ret); > + > + if (!xe_vdev->vfid) > + return; > + > + /* > + * As the higher VFIO layers are holding locks across reset and using > + * those same locks with the mm_lock we need to prevent ABBA deadlock > + * with the state_mutex and mm_lock. > + * In case the state_mutex was taken already we defer the cleanup work > + * to the unlock flow of the other running context. > + */ > + spin_lock(&xe_vdev->reset_lock); > + xe_vdev->deferred_reset = true; > + if (!mutex_trylock(&xe_vdev->state_mutex)) { > + spin_unlock(&xe_vdev->reset_lock); > + return; > + } > + spin_unlock(&xe_vdev->reset_lock); > + xe_vfio_pci_state_mutex_unlock(xe_vdev); > + > + xe_vfio_pci_reset(xe_vdev); > +} [snip] My first KVM review :) I think xe_vfio_pci_reset(xe_vdev) need be protected by state_mutex. So, we should move xe_vfio_pci_state_mutex_unlock(xe_vdev) after xe_vfio_pci_reset(xe_vdev). Thoughts? Thanks, Angela