From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f170.google.com (mail-pl1-f170.google.com [209.85.214.170]) (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 873CF3101B0 for ; Wed, 25 Feb 2026 08:03:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772006611; cv=none; b=RowxAcGtpBEmbjrZ2Qp6JKGkYCClI3m4dRyQNLnB561DA0H02+0q8YwsF6Fu51EDVSf3wcZT3DoYbifg+v4k0oXeP0Rm+j1bVimnFMRBybFrUvcpL/4V2JVlzoyldBoRyMPuagt/gMjGDAF+qZo/nl/cCVhOG2buvf0NaaQIoyQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772006611; c=relaxed/simple; bh=bq6zwXtFCcnqrhZIHxjGnvBS+KlyTU9xlpYaT604hrE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=cI2PfnG6cqG/mflVMPuNCKQeWQuldH2BOvfgVTmrnUvvIW9zKJsJ3OrQEYl7zFxZjuOJicc7su9hMm82KRQlxqW3tUhsVjcNR/0MjbdfsOU4bmRF0gRc7i+cWW0nvY13vLeeH9cWVKBOev4YxmlewvGxrt/uFBUt04Dg41e/eZA= 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=QEN4BMRI; arc=none smtp.client-ip=209.85.214.170 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="QEN4BMRI" Received: by mail-pl1-f170.google.com with SMTP id d9443c01a7336-2ada9e4ea32so55965ad.1 for ; Wed, 25 Feb 2026 00:03:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1772006610; x=1772611410; 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=sCJxVjDFn9Nx1ZVu0w3V3L8nPN74ZP9DglkzEBV+/BI=; b=QEN4BMRI3NcE4s4dHITuXTcZZePBS1pa5N7KS5NPIL0HW2SIO+xI7LqmE+gzxENW1t db5f3juWENY4Cn13Po/FHPGa2PSZML3rqQLoVgVs0ZW5e+H4Ke+OnwrhtSAtlGK2FVqo i+68/6axzRRuCqzk/1Ot2WM0e7XUc0VpfbGTUl/ATa6rLoZMx/nwxjQUcxtY3TYaiNIM aG8kHl3ipr/WLb0kjr6y4FjsD9tOj1Nr+nngKm3+etCnD/jXOL9VJXjVPi/OOQB038JG 0rYUrOs8KTU0z/pHYb4Bkd3RhtzvNoqjEbwBimPDUcF87cY2BemjgWPUfvPP7XkqWXrK hfKg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772006610; x=1772611410; 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=sCJxVjDFn9Nx1ZVu0w3V3L8nPN74ZP9DglkzEBV+/BI=; b=RShhu+6kyW5G5s4GEmvebnrQOq+LEBqrgmx0IieFyCm3b8TalkDNJoSPOu83kcsJ8Q SzNiuP6aKpEsj4Fvhqh8O61iT6YQwO8gCO8/dZVp9mtfraS6f/tEb6+wjJy8gKdajTeI i6GLr2x+QF0WhIS16C2Lb62uM/r0QVTJky5NlruvJ0o94In3EWY5ibgyRPiEgBzjUiLd mH6bYjfqnqzlH2wAj45Zn0x0sjswyGekc3+hwAeb4Kd+wmvzK/O/BO5Jd66UBJyefi13 nqo4QiMHDZ0779BmIamHmE6HPknMSAYs2SQq42/AQ2Pn1b8WJ1c0bH/ylNEEaqC9PZ3v T2+w== X-Forwarded-Encrypted: i=1; AJvYcCW4kMR4ZGsRIxAmjPmp1pnps4S7V1K9mbHU4LObjE0dFjWmjaFCefdWrdN623HpDKeK6CFCjPTK6rGjExo=@vger.kernel.org X-Gm-Message-State: AOJu0YweyRTfbjspEVF13FvSrzOKQdqrZaakSNroM3VuUJzqp5P/ZOI6 /e7MtppGorAQxBP5Lzf2TRsm1rAFUgM4bMuwwFxLespvZrRBhd2i36KphW8T9W2bTw== X-Gm-Gg: ATEYQzwJZ9zMB/qJwn/X4Wwo32X7B2ldv5xhV+YQqlE14SPBCGfty5MpntIiOtm/zmK MGH0p8GHh2h3i+tqWDUtNmj/myOczjwvcqe1L15W8o/4ahXLKaSMNroglbkPaSPyXqc6maZBQ1H SMTL5GydzNrlus05u+KuiFFpARkov8DM7swfZ05AqXtj7DTZB+4yrYcBzhLrYZ59j+gkJn57ox/ kPDfjW6VtyzXXSQxkwK5Z37ovUxLdOpTd14PPREAQ1XrTSTWcTzDCwuBhs3mrFHA+s6ZGtFkpU+ O7XfHGVrPYbpJ6FnlJ2VFspCm9voAWtq6/gWj3+y9LxU0D0/H9O4emLE/npLYdn0/+P2oTE1ZzR E8I+0Q486lENO5hydHJT2QeKSTfhhgkkK7xn4SbbsTjoePBdZ5bTb2Bro2MMFX2gWM2uKTjczqq 3k6LTx6+u3UTwP5+jy4ww8B/VG050rkuXeUBca29GBUd9NW/7/WLysQORxIesT X-Received: by 2002:a17:902:ecc2:b0:2a7:7f07:340e with SMTP id d9443c01a7336-2adca6c9d85mr1313215ad.4.1772006609152; Wed, 25 Feb 2026 00:03:29 -0800 (PST) Received: from google.com (222.245.187.35.bc.googleusercontent.com. [35.187.245.222]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3591342f19fsm421683a91.10.2026.02.25.00.03.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Feb 2026 00:03:28 -0800 (PST) Date: Wed, 25 Feb 2026 08:03:18 +0000 From: Pranjal Shrivastava To: David Matlack Cc: Alex Williamson , Adithya Jayachandran , Alexander Graf , Alex Mastro , Alistair Popple , Andrew Morton , Ankit Agrawal , Bjorn Helgaas , Chris Li , David Rientjes , Jacob Pan , Jason Gunthorpe , Jason Gunthorpe , Jonathan Corbet , Josh Hilke , 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, Lukas Wunner , =?utf-8?Q?Micha=C5=82?= Winiarski , Mike Rapoport , Parav Pandit , Pasha Tatashin , Pratyush Yadav , Raghavendra Rao Ananta , Rodrigo Vivi , Saeed Mahameed , Samiullah Khawaja , Shuah Khan , Thomas =?iso-8859-1?Q?Hellstr=F6m?= , Tomita Moeko , Vipin Sharma , Vivek Kasireddy , William Tu , Yi Liu , Zhu Yanjun Subject: Re: [PATCH v2 08/22] vfio: Enforce preserved devices are retrieved via LIVEUPDATE_SESSION_RETRIEVE_FD Message-ID: References: <20260129212510.967611-1-dmatlack@google.com> <20260129212510.967611-9-dmatlack@google.com> Precedence: bulk X-Mailing-List: linux-kernel@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: <20260129212510.967611-9-dmatlack@google.com> On Thu, Jan 29, 2026 at 09:24:55PM +0000, David Matlack wrote: > Enforce that files for incoming (preserved by previous kernel) VFIO > devices are retrieved via LIVEUPDATE_SESSION_RETRIEVE_FD rather than by > opening the corresponding VFIO character device or via > VFIO_GROUP_GET_DEVICE_FD. > > Both of these methods would result in VFIO initializing the device > without access to the preserved state of the device passed by the > previous kernel. > > Signed-off-by: David Matlack > --- > drivers/vfio/device_cdev.c | 4 ++++ > drivers/vfio/group.c | 9 +++++++++ > include/linux/vfio.h | 18 ++++++++++++++++++ > 3 files changed, 31 insertions(+) > Reviewed-by: Pranjal Shrivastava Thanks, Praan