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([2404:f801:9000:18:efec::75b]) by smtp.gmail.com with ESMTPSA id n184-20020a6227c1000000b0056b9df2a15esm825190pfn.62.2022.11.03.07.27.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 03 Nov 2022 07:27:39 -0700 (PDT) Message-ID: Date: Thu, 3 Nov 2022 22:27:28 +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 07/12] Drivers: hv: vmbus: Remove second mapping of VMBus monitor pages 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> <1666288635-72591-8-git-send-email-mikelley@microsoft.com> From: Tianyu Lan In-Reply-To: <1666288635-72591-8-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 changes to how Hyper-V guest VMs flip memory between private > (encrypted) and shared (decrypted), creating a second kernel virtual > mapping for shared memory is no longer necessary. Everything needed > for the transition to shared is handled by set_memory_decrypted(). > > As such, remove the code to create and manage the second > mapping for VMBus monitor pages. Because set_memory_decrypted() > and set_memory_encrypted() are no-ops in normal VMs, it's > not even necessary to test for being in a Confidential VM > (a.k.a., "Isolation VM"). > > Signed-off-by: Michael Kelley Reviewed-by: Tianyu Lan