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([2404:f801:9000:1a:efea::75b]) by smtp.gmail.com with ESMTPSA id bi11-20020a170902bf0b00b001866a019010sm815765plb.97.2022.11.03.08.25.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Nov 2022 08:25:32 -0700 (PDT) Message-ID: <941fe781-674c-ad08-3f33-b99d1c7e3539@gmail.com> Date: Thu, 3 Nov 2022 23:25:19 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.4.1 Subject: Re: [PATCH 10/12] Drivers: hv: Don't remap addresses that are above shared_gpa_boundary Content-Language: en-US To: Michael Kelley , hpa@zytor.com, kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, luto@kernel.org, peterz@infradead.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, lpieralisi@kernel.org, robh@kernel.org, kw@linux.com, bhelgaas@google.com, arnd@arndb.de, hch@infradead.org, m.szyprowski@samsung.com, robin.murphy@arm.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, Tianyu.Lan@microsoft.com, kirill.shutemov@linux.intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, ak@linux.intel.com, isaku.yamahata@intel.com, dan.j.williams@intel.com, jane.chu@oracle.com, seanjc@google.com, tony.luck@intel.com, x86@kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, iommu@lists.linux.dev References: <1666288635-72591-1-git-send-email-mikelley@microsoft.com> <1666288635-72591-11-git-send-email-mikelley@microsoft.com> From: Tianyu Lan In-Reply-To: <1666288635-72591-11-git-send-email-mikelley@microsoft.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On 10/21/2022 1:57 AM, Michael Kelley wrote: > With the vTOM bit now treated as a protection flag and not part of > the physical address, avoid remapping physical addresses with vTOM set > since technically such addresses aren't valid. Use ioremap_cache() > instead of memremap() to ensure that the mapping provides decrypted > access, which will correctly set the vTOM bit as a protection flag. > > While this change is not required for correctness with the current > implementation of memremap(), for general code hygiene it's better to > not depend on the mapping functions doing something reasonable with > a physical address that is out-of-range. > > While here, fix typos in two error messages. > > Signed-off-by: Michael Kelley > --- Reviewed-by: Tianyu Lan