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Mon, 1 Aug 2022 21:53:59 +0000 Received: from SN6PR12MB2767.namprd12.prod.outlook.com ([fe80::8953:6baa:97bb:a15d]) by SN6PR12MB2767.namprd12.prod.outlook.com ([fe80::8953:6baa:97bb:a15d%7]) with mapi id 15.20.5482.016; Mon, 1 Aug 2022 21:53:59 +0000 From: "Kalra, Ashish" To: Borislav Petkov , Sean Christopherson CC: Dave Hansen , "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" , "Lendacky, Thomas" , "hpa@zytor.com" , "ardb@kernel.org" , "pbonzini@redhat.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" , "Roth, Michael" , "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" Subject: RE: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers Thread-Topic: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers Thread-Index: AQHYhkJMEjVRVcpx502HVSPCQUlAqK1bejcAgAACPYCAAD2E8IAAAkWAgAAEHtCAAALbAIAAEKeAgAACGACAAAZmMIABummAgAABGvCALNnqAIAAfWiAgAAF14CAAAOTAIAP3LBQ Date: Mon, 1 Aug 2022 21:53:59 +0000 Message-ID: References: <99d72d58-a9bb-d75c-93af-79d497dfe176@intel.com> <5db37cc2-4fb1-7a73-c39a-3531260414d0@intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_4342314e-0df4-4b58-84bf-38bed6170a0f_Enabled=true; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2767.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8d26a7f8-da80-4263-bc74-08da740856f5 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Aug 2022 21:53:59.3383 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: hatC2jMXMVbzpuCz1bO7U5bs5/8daMCKHepkTkbEUgTTsTWQ5xxI34IUJ2Ya7F39qpbtGC29iuRiqkPiHzLpnQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB6343 [AMD Official Use Only - General] As I mentioned before, in the future we will have architectural support to = read RMP table entries, we will first check for availability of this feature and use it always if it is supported and enabl= ed, and only fallback to doing raw RMP table access if this architectural support is not available. Thanks, Ashish -----Original Message----- From: Borislav Petkov =20 Sent: Friday, July 22, 2022 2:38 PM To: Sean Christopherson Cc: Kalra, Ashish ; Dave Hansen ; x86@kernel.org; linux-kernel@vger.kernel.org; kvm@vger.kernel.org; linu= x-coco@lists.linux.dev; linux-mm@kvack.org; linux-crypto@vger.kernel.org; t= glx@linutronix.de; mingo@redhat.com; jroedel@suse.de; Lendacky, Thomas ; hpa@zytor.com; ardb@kernel.org; pbonzini@redhat.com;= vkuznets@redhat.com; jmattson@google.com; luto@kernel.org; dave.hansen@lin= ux.intel.com; slp@redhat.com; pgonda@google.com; peterz@infradead.org; srin= ivas.pandruvada@linux.intel.com; rientjes@google.com; dovmurik@linux.ibm.co= m; tobin@ibm.com; Roth, Michael ; vbabka@suse.cz; kir= ill@shutemov.name; ak@linux.intel.com; tony.luck@intel.com; marcorr@google.= com; sathyanarayanan.kuppuswamy@linux.intel.com; alpergun@google.com; dgilb= ert@redhat.com; jarkko@kernel.org Subject: Re: [PATCH Part2 v6 05/49] x86/sev: Add RMP entry lookup helpers Btw, what could work is to spec only a *version* field somewhere in the HW or FW= which says which version the RMP header has. Then, OS would check that field and if it doesn't support that certain vers= ion, it'll bail. I'd need to talk to folks first, though, what the whole story is behind not= spec-ing the RMP format... -- Regards/Gruss, Boris. https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fpeople.= kernel.org%2Ftglx%2Fnotes-about-netiquette&data=3D05%7C01%7CAshish.Kalr= a%40amd.com%7Cfc8ed4feddb346bbae8a08da6c19b7d6%7C3dd8961fe4884e608e11a82d99= 4e183d%7C0%7C0%7C637941154968117489%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjA= wMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sda= ta=3DkhiE7a%2FAW8C%2B0RilZHWxGvMtnlQkDTlC5UtU8Q3L1Lo%3D&reserved=3D0