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Mon, 3 May 2021 12:08:18 +0000 Received: from [10.20.22.163] (172.20.145.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 3 May 2021 12:08:17 +0000 Subject: Re: [RFC 1/2] vfio/pci: keep the prefetchable attribute of a BAR region in VMA To: Marc Zyngier CC: Vikram Sethi , Alex Williamson , Will Deacon , Catalin Marinas , Christoffer Dall , "linux-arm-kernel@lists.infradead.org" , "kvmarm@lists.cs.columbia.edu" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , Jason Sequeira References: <20210429162906.32742-1-sdonthineni@nvidia.com> <20210429162906.32742-2-sdonthineni@nvidia.com> <20210429122840.4f98f78e@redhat.com> <470360a7-0242-9ae5-816f-13608f957bf6@nvidia.com> <20210429134659.321a5c3c@redhat.com> <87czucngdc.wl-maz@kernel.org> <1edb2c4e-23f0-5730-245b-fc6d289951e1@nvidia.com> <878s4zokll.wl-maz@kernel.org> <87eeeqvm1d.wl-maz@kernel.org> <49e26646-9f05-ccb8-f5c1-73a92ab79972@nvidia.com> <87czu8uowe.wl-maz@kernel.org> From: Shanker R Donthineni Message-ID: <22e592c5-58e5-5456-311d-3d23303a91ac@nvidia.com> Date: Mon, 3 May 2021 07:08:15 -0500 User-Agent: Mozilla/5.0 (X11; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 May 2021 12:08:18.4931 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1ba67fa3-f649-435e-bb63-08d90e2c2381 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.34];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT064.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB2828 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Marc, On 5/3/21 4:50 AM, Marc Zyngier wrote: > You are mixing two things: what Linux/arm64 gives to kernel drivers, > and what KVM, as an implementation of the ARMv8 architecture, gives to > virtual machines. There is zero reason for the two to match if there > is no definition of what we need to provide. Suggestion here is memory-types PROT_NORMAL_NC and PROT_DEVICE_nGnRE are applicable to braemetal only and don't use for device memory inside VM.