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22 Jun 2022 07:13:46 -0700 X-IronPort-AV: E=Sophos;i="5.92,212,1650956400"; d="scan'208";a="677555339" Received: from bshakya-mobl.amr.corp.intel.com (HELO [10.212.188.76]) ([10.212.188.76]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jun 2022 07:13:44 -0700 Message-ID: Date: Wed, 22 Jun 2022 07:13:26 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers Content-Language: en-US To: Ashish Kalra , 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 Cc: 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, bp@alien8.de, michael.roth@amd.com, vbabka@suse.cz, 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 References: <8f63961f00fd170ba0e561f499292175f3155d26.1655761627.git.ashish.kalra@amd.com> From: Dave Hansen In-Reply-To: <8f63961f00fd170ba0e561f499292175f3155d26.1655761627.git.ashish.kalra@amd.com> Content-Type: text/plain; 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bh=+EXRl6WV5FG4M9RIL6Oi04vvsi30kRgWRes9pKk2Hh0=; b=GH1Lj2+Xhz8PVScY1MmYxFpU0Exe3MNT57tQoUp+KjksaOuBqU2kcoAYvNKDE1Gj+qxQjH 1/OZ7a/z3p5NZwwF9oAKbzV9ilogl+V5hfYeQrio8HZsq0kwPhq6MrMwSfuYyxOn6868I/ YX94yHvZViAim8UDG4HFS5BwL/mYewo= X-Rspamd-Queue-Id: 78D4B1C00BB X-Rspam-User: Authentication-Results: imf20.hostedemail.com; dkim=temperror ("DNS error when getting key") header.d=intel.com header.s=Intel header.b=ktOgGoz1; dmarc=temperror reason="SPF/DKIM temp error" header.from=intel.com (policy=temperror); spf=none (imf20.hostedemail.com: domain of dave.hansen@intel.com has no SPF policy when checking 134.134.136.100) smtp.mailfrom=dave.hansen@intel.com X-Rspamd-Server: rspam03 X-Stat-Signature: zjnbqswp79dr8nxe31i79iezq7tzwypi X-HE-Tag: 1655907243-832941 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 6/20/22 16:02, Ashish Kalra wrote: > +/* > + * The RMP entry format is not architectural. The format is defined in PPR > + * Family 19h Model 01h, Rev B1 processor. > + */ Let's say that Family 20h comes out and has a new RMP entry format. What keeps an old kernel from attempting to use this old format on that new CPU?