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X-IronPort-AV: E=McAfee;i="6600,9927,10872"; a="418013080" X-IronPort-AV: E=Sophos;i="6.03,246,1694761200"; d="scan'208";a="418013080" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Oct 2023 09:57:36 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10872"; a="1005361732" X-IronPort-AV: E=Sophos;i="6.03,246,1694761200"; d="scan'208";a="1005361732" Received: from dahansge-mobl.amr.corp.intel.com (HELO [10.212.208.196]) ([10.212.208.196]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Oct 2023 09:57:35 -0700 Message-ID: <1d9c03d9-9ec4-4b59-93ae-bf0a6c163217@intel.com> Date: Mon, 23 Oct 2023 09:57:34 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/10] Handle set_memory_XXcrypted() errors Content-Language: en-US To: "Michael Kelley (LINUX)" , Rick Edgecombe , "x86@kernel.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "hpa@zytor.com" , "luto@kernel.org" , "peterz@infradead.org" , "kirill.shutemov@linux.intel.com" , "elena.reshetova@intel.com" , "isaku.yamahata@intel.com" , "seanjc@google.com" , "thomas.lendacky@amd.com" , Dexuan Cui , "sathyanarayanan.kuppuswamy@linux.intel.com" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-s390@vger.kernel.org" References: <20231017202505.340906-1-rick.p.edgecombe@intel.com> <73b02835-dbd6-4662-91f9-e8324d8cbf98@intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Mon, 23 Oct 2023 09:57:49 -0700 (PDT) On 10/23/23 09:47, Michael Kelley (LINUX) wrote: > For paranoid CoCo VM users, using panic_on_warn=1 seems workable. > However, with current code and this patch series, it's possible have > set_memory_decrypted() return an error and have set_memory_encrypted() > fix things up as best it can without generating any warnings. It seems > like we need a WARN or some equivalent mechanism if either of these > fails, so that CoCo VMs can panic if they don't want to run with any > inconsistencies (again, assuming the host isn't malicious). Adding a warning to the fixup path in set_memory_encrypted() would be totally fine with me.