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(p200300cbc74fd600c705bc2517b271c9.dip0.t-ipconnect.de. [2003:cb:c74f:d600:c705:bc25:17b2:71c9]) by smtp.gmail.com with ESMTPSA id g17-20020a7bc4d1000000b003fc02e8ea68sm15188204wmk.13.2023.09.12.00.19.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 12 Sep 2023 00:19:39 -0700 (PDT) Message-ID: <96f124d6-c1f2-adb3-1d3b-8329e85ff099@redhat.com> Date: Tue, 12 Sep 2023 09:19:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH V2 1/2] efi/unaccepted: Do not let /proc/vmcore try to access unaccepted memory To: Adrian Hunter , "Kirill A. Shutemov" , Borislav Petkov , Andrew Morton , Ard Biesheuvel Cc: Dave Hansen , Vlastimil Babka , Mike Rapoport , Lorenzo Stoakes , Tom Lendacky , Baoquan He , Vivek Goyal , Dave Young , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, kexec@lists.infradead.org References: <20230911112114.91323-1-adrian.hunter@intel.com> <20230911112114.91323-2-adrian.hunter@intel.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230911112114.91323-2-adrian.hunter@intel.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: BE7A9C001C X-Stat-Signature: do7d3ekb8te6kc4h4tkqpztxnenmxx3o X-Rspam-User: X-HE-Tag: 1694503183-427358 X-HE-Meta: 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 YBYtAhQR FKmUd0wMayid0GliFJjHtfGlQhf3UaBRFJ9GqjVfneUg8eXv8YZ59WcvzFB817mwJ3Pwsb39dtooBou7WKob9USpXFdRvXH2KlS+sICP/2Yxjdze0Tcp1rL2AHGrrqRBSEcCaNIyyHGdh0WP1T2qNa/aEMYF6mOZ37+7S2GJPiIV/mlqstBqQW4w9/SUDxdmbgqmsYGWgKVFwKMKV268n1Y8/xiCrceBwlRxy7KMFwhMSeQRmoCFuk1LJCeub6h4PLRFqsGkpFWvDERZes2CVq90gatJgqKHngrLKGk69a/jzuCn8dmqB6TQm52qPGFnh1dV/sf32AS/2mw/NUCWs0Tb4fE7JwKAi7cgEArrWTPG9Gduntopa1CBsI8Okg8b9O087RRrgrjuc778ZSImsIyjzrRKQ3Rrv2E7oYTU0kfVQfbP9SOg7OmO/Aw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 11.09.23 13:21, Adrian Hunter wrote: > Support for unaccepted memory was added recently, refer commit dcdfdd40fa82 > ("mm: Add support for unaccepted memory"), whereby a virtual machine may > need to accept memory before it can be used. > > Do not let /proc/vmcore try to access unaccepted memory because it can > cause the guest to fail. Oh, hold on. What are the actual side effects of this? Once we're in the kdump kernel, any guest is already dead. So failing a guest doesn't apply, no? -- Cheers, David / dhildenb