From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f44.google.com (mail-pj1-f44.google.com [209.85.216.44]) (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 8F44A3DBD7D for ; Tue, 24 Mar 2026 17:06:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.44 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774371962; cv=none; b=MR8l610kdnpqpYzyYAUrWA2RQJkMYoyk4Mg2IB9RIZO3Gt0WYnGuFJv+JsjCjQ94imlMKc/qwlituXxkTWw/Z2qvfvTrrkocuYdnW2XQ+520wP1yOpMrW94GAwnBg3BsNdrmJHcBcuyr0Zj1t7xF0d8HPD19QhgFC0uiq3ff+4c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774371962; c=relaxed/simple; bh=5Sv9xAJZpaaT64nid3Je6B7u2J/2/RXvcmlIiaS9WJs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=MjTU6+KMND49MN5b2Pamw9EA3iD3qeke0oOhsZqXZ7kbghF2AjKhgmxN7QtlD50ej6fcUQRXvdsCOwT8xjO69FqWuzEECr4BpQ99f1YxFcFwG9yIXZOttr+6ywuxhAO57exG32Lx30sCoxd/2D60wI46pZRgby8kgjjuiMIPi+Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=F+ocCLqH; arc=none smtp.client-ip=209.85.216.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="F+ocCLqH" Received: by mail-pj1-f44.google.com with SMTP id 98e67ed59e1d1-35c05d7e0e9so774235a91.1 for ; Tue, 24 Mar 2026 10:06:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1774371961; x=1774976761; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=oHY3J33g6ujwnRTqJrGO/jD1PTpcRqvXhZiCbNP/dps=; b=F+ocCLqHYAl+5Nc+4oVSi7m0MB45HhMwwGram+xxk+ok4l5Rgi55wO5VdXordRD9n3 JqHAZNOJ3l5EmfJDXbH9R3Zs6GcE8DVzMsqQciMx5+ccLWQulqC51YKSLjC031syfrLR 8LRl8tIr8z2MTLzw/wb7/S+QzhUNxoNYlb5k7OFDYTKid7ZJwMH0TxTrZ0uSf2U+HMDf eCpbLo1ex6VU/MjzjpkFwcn0kHW+nvSCnTZ2pfYPs3EjtXKvZDr6D5msjGik81+r2mtz zokKo3/2k5YytK/jpjzakodzAOIhLsQ8dJcPgCgHQU2kqCNu0fvm+zHQglERoWcLPK0b O7tw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774371961; x=1774976761; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=oHY3J33g6ujwnRTqJrGO/jD1PTpcRqvXhZiCbNP/dps=; b=O/rFFq25g7V0wg5nSlwI/fdD13l0oaIkpX905MJVq68vDvsdBLKPlJBRes5cp7B/QE BZQ9G92Lesu4Qoxb/pEJ4OJSZvlyzbgmK207XZikGwYFUxsTpzV8pQal0wdqqQbDB1bD 61SJgMWfigvtS56fSOtvJnLtIUO2MddQChXiyQ7gJQT7nnwRNb0ThuIYX7jCcDqCr6gs RJA8Jjmpi/RXtCYmUaaZVFkBifsnDPcJK9XehIHht0zvuWvBzZxRFcRJ/RSXfQJ4io2E zgxboLqBUsvzZaC8758/vwEb3EqEEwJG+WJ8Gd9JMtqFgX32O6IlsaIyPf+h7VJBE1V2 LF0A== X-Forwarded-Encrypted: i=1; AJvYcCUubXBtv7CMsi2vvrwkMG6rqlpMKNVwrqtaRyuyGVzuwntb8ctjIA6N/BvZfOet9VtjvW/Gof0vD+HOIU0vjtw=@vger.kernel.org X-Gm-Message-State: AOJu0YwTjWFAO8Se0c6+95NSYuqBby8rf9qBilBSbjYdPtp50DcR5cci u5LuR99REpMEdJM1hjrw/nxLBwcFYKkcyaybN7iOb6KgMnLuyHo/viZKoHZA8xXigg== X-Gm-Gg: ATEYQzxkOgawqOpfnY95EZVHAogIYf7mUotobd5cBzByp6YqVlRGs17xIC1EEAUrni+ F7hgE7lEWH9tCQ3jx7GxadNywybzdIgkgGDZZFUObhlYw2AOIHCt1E2URJrWLakOmljMDpBKdOb HnTBKKWDlI5TIZ6akmHcxz0fpdnKT8h/7lyscO4ZSeK5RVrXTptPFGKMSB7LQfp0ErgJsGnjRm5 L2oYYLLvszGpMKH83ZxFOUrPesPOrwZHEpsqReM8gD1HnW5s4wJoC3oKsl2GY/Fb1z0JIlbD3iL wdLyF9ZT+fy21ayj+A1C9CoSsoiV5ZwtCVko/ZkXWl2luGMXT4/JxDjLgHjjIL3Mxga63JHVdvY UXs/WxQyPbVGlYcjpot+04pfRjNj9qiCnHuZIPsfsJX0M2qBb7PBLdd5gRDWXgKlQA4TMoCoCg3 AOKcovBup6Zgb/52PQiokbxra5uiW940GAIUVhyQtYoWKwruINtYedfSTp0r6hAg== X-Received: by 2002:a17:90b:2249:b0:35b:a53a:7d0b with SMTP id 98e67ed59e1d1-35c0dd3ae00mr92968a91.20.1774371960194; Tue, 24 Mar 2026 10:06:00 -0700 (PDT) Received: from google.com (239.23.105.34.bc.googleusercontent.com. [34.105.23.239]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35c03172a8asm3524836a91.15.2026.03.24.10.05.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 10:05:59 -0700 (PDT) Date: Tue, 24 Mar 2026 17:05:55 +0000 From: David Matlack To: Yi Liu Cc: Alex Williamson , Bjorn Helgaas , Adithya Jayachandran , Alexander Graf , Alex Mastro , Andrew Morton , Ankit Agrawal , Arnd Bergmann , Askar Safin , "Borislav Petkov (AMD)" , Chris Li , Dapeng Mi , David Rientjes , Feng Tang , Jacob Pan , Jason Gunthorpe , Jason Gunthorpe , Jonathan Corbet , Josh Hilke , Kees Cook , Kevin Tian , kexec@lists.infradead.org, kvm@vger.kernel.org, Leon Romanovsky , Leon Romanovsky , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Li RongQing , Lukas Wunner , Marco Elver , =?utf-8?Q?Micha=C5=82?= Winiarski , Mike Rapoport , Parav Pandit , Pasha Tatashin , "Paul E. McKenney" , Pawan Gupta , "Peter Zijlstra (Intel)" , Pranjal Shrivastava , Pratyush Yadav , Raghavendra Rao Ananta , Randy Dunlap , Rodrigo Vivi , Saeed Mahameed , Samiullah Khawaja , Shuah Khan , Vipin Sharma , Vivek Kasireddy , William Tu , Zhu Yanjun Subject: Re: [PATCH v3 08/24] vfio/pci: Retrieve preserved device files after Live Update Message-ID: References: <20260323235817.1960573-1-dmatlack@google.com> <20260323235817.1960573-9-dmatlack@google.com> <815947ee-2603-47f0-9b03-f523601eae86@intel.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <815947ee-2603-47f0-9b03-f523601eae86@intel.com> On 2026-03-24 09:08 PM, Yi Liu wrote: > On 3/24/26 07:58, David Matlack wrote: > > From: Vipin Sharma > > > > Enable userspace to retrieve preserved VFIO device files from VFIO after > > a Live Update by implementing the retrieve() and finish() file handler > > callbacks. > > > > Use an anonymous inode when creating the file, since the retrieved > > device file is not opened through any particular cdev inode, and the > > cdev inode does not matter in practice. > > do we have a list of struct file fields that do not matter? My understanding is that VFIO only cares about these fields in struct file: - private_data: Pointer to struct vfio_device_file - f_op: Pointer to vfio_device_fops - f_mapping: Pointer to vfio_device->inode->i_mapping This is based on cross-referencing VFIO_GROUP_GET_DEVICE_FD (which uses an anonymous inode) and the cdev code. > > +err_free_device_file: > > + kvfree(df); > > any reason to use kvfree()? No this can be kfree(). Will fix in v4.