From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f182.google.com (mail-pl1-f182.google.com [209.85.214.182]) (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 7D9233101A9 for ; Wed, 25 Feb 2026 08:03:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772006612; cv=none; b=FhVp3zXNzKPnWQkMaD0olW/9r8PdKEbMg8POrlIsXHh72bE0pMRajACMwUYS8/MFdxI3f+ZVEb0hgeV2W7m4GyB+I6WTxIYqJqLanQMh32vW7a/52YFgwn4/z776s9ZfcfLhx8K/g3MLgnM4rFJ2GaQPpaRSviYhwWPmzz4Rg9Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772006612; 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=ZN0oEiYQ31iNhJ/a0Bvhou79nxQVyu0VFCxMDH/3roFF1wKKIHrJskV9dioQQC6Cqu9l92MKvCCn97aL+Q/2Hab8gSyKrIUpS0fjX0crvWKjv9I4yP5Dmb4+xBhzgiwSGycxx9QvRHWkLCRQl/KuQW3Qcuaz3Xn4bw6ZW9keI9w= 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=209.85.214.182 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-f182.google.com with SMTP id d9443c01a7336-2adb1c1f9d4so75495ad.0 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=NeqbJuHGqUIfsAtY6tK23Jk3Yoe91mSpt2rymoEInPPJ0FRjXdZIDpKhaHrpATUIE4 U4euc6z5FwArC1/I34vv8TdxSEMIhn1OdGHmuDnvxTRJcOPotNIcAnuFYl0m6xMHrRJq yY8OAu++KYMwE51MZVrFpD/IUb1Wo2rU89qENsjFJlYvPKFJ6U1tpRDHbVS9Hb6/Hnsl o5xaKJRD8h1ygSBL5A8oP6VXA4dbDuX9LO9Z8f5qpymEMcWsWdi1YavSLc5gBdfs+f5Q 2/Tjlcn9TFTYsTCgCc0YmYgweSmj2Ln80KwkCC+yLxcONEydkqoznHRUUk2VBI0YnsH6 iVag== X-Forwarded-Encrypted: i=1; AJvYcCVDlFPn0p4ss7cHCYSJWPBBhx4Lf10XfTCJzuFnyeel0aoeZvBKDz/mQkvq6yhYElwX8E39yTsOGig=@vger.kernel.org X-Gm-Message-State: AOJu0YxDBagyf/UTXpp6aMCfmJ5GqKwNWYGSEznWLnK1te+nMtmymrKt 8dp19JaJWPSWrB4S996z558on/p4f9Mi9xTKaHPxIb7xTxjYhoWBTGqItiTAacIIpA== X-Gm-Gg: ATEYQzyHDhNdVykvhLINvSTiWzM93UIfjx7ExhQGBycZNG118jToRF12DzMOhS6JNCU GrQ8jvftXAwRXWBJbGCF5W9vttNCYIh2OnARNM1Y/gen9DvwP+4ZKfGAjamajTHisV0HjUenXzu g0/OK8m1b0pjs0b+rBKyAr8Rl5hX/itbYFYkU+SUiV9GfXY0siWzkcBEqXQSLafYZawuIxSuDNz v+LVcvfhGlXvrkeEe5QoZ/zswdEbk0asnz4uy/yf9hYLTF4KI3F1F68iXUKKQzmwSNjaiyh94ZH zPgKrgvu5mu+W1nvnDcCn1pSpTWllBUL4ukWSUw03GxxactZWdYYIaIGV/Vhp2guIEPPgCXwqPd MeFQKQXbMN1CFXTaiW0A4RIhYuYQkS/xApGbgIqfWsP2m5VQ1imklKuQiBuVqN6B2BxaN8TyQi1 zlGZkzuICJ7KSzr6amk0+CevnLpvxhJ4SuqTQogwRISPrYfsNAZMu/ll8mtdG9 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-doc@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