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Received: from SN6PR12MB2767.namprd12.prod.outlook.com (2603:10b6:805:75::23) by SJ1PR12MB6124.namprd12.prod.outlook.com (2603:10b6:a03:459::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5813.18; Tue, 15 Nov 2022 22:44:52 +0000 Received: from SN6PR12MB2767.namprd12.prod.outlook.com ([fe80::395:21e6:abfd:7894]) by SN6PR12MB2767.namprd12.prod.outlook.com ([fe80::395:21e6:abfd:7894%6]) with mapi id 15.20.5813.018; Tue, 15 Nov 2022 22:44:52 +0000 Message-ID: <01a24370-895c-465a-c7fb-0c6a86c301bc@amd.com> Date: Tue, 15 Nov 2022 16:44:46 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.2.1 Subject: Re: [PATCH Part2 v6 14/49] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Content-Language: en-US To: Borislav Petkov Cc: Vlastimil Babka , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, jroedel@suse.de, thomas.lendacky@amd.com, hpa@zytor.com, ardb@kernel.org, pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com, jmattson@google.com, luto@kernel.org, dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com, peterz@infradead.org, srinivas.pandruvada@linux.intel.com, rientjes@google.com, dovmurik@linux.ibm.com, tobin@ibm.com, michael.roth@amd.com, kirill@shutemov.name, ak@linux.intel.com, tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com, alpergun@google.com, dgilbert@redhat.com, jarkko@kernel.org, "Kaplan, David" , Naoya Horiguchi , Miaohe Lin , Oscar Salvador References: <380c9748-1c86-4763-ea18-b884280a3b60@amd.com> <6511c122-d5cc-3f8d-9651-7c2cd67dc5af@amd.com> <7882353e-2b13-d35a-b462-cef35ee56f51@suse.cz> From: "Kalra, Ashish" In-Reply-To: Content-Type: text/plain; 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With UPM, the guest pages are all still freed back to the host after guest shutdown, so it's not clear how this would help with handling of leaked pages, for e.g, the host can still access these pages once the guest is shutdown and it will cause the RMP violation #PF at that point. Additionally, our use case is of host allocated firmware pages as part of the crypto driver (to be passed to SNP firmware api calls and then re-transitioned back to host state on return) so these are not guest private pages in the true sense and they need to be handled differently in case there is a failure in reclaiming them. Can you elaborate on what you have in mind ? Thanks, Ashish > > And Michael has patches so you probably should talk to him... > > Thx. >