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Fri, 24 Apr 2020 21:27:35 +0000 Subject: Re: [PATCH] Allow RDTSC and RDTSCP from userspace To: Dave Hansen , Mike Stunes , joro@8bytes.org Cc: dan.j.williams@intel.com, dave.hansen@linux.intel.com, hpa@zytor.com, jgross@suse.com, jroedel@suse.de, jslaby@suse.cz, keescook@chromium.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, luto@kernel.org, peterz@infradead.org, thellstrom@vmware.com, virtualization@lists.linux-foundation.org, x86@kernel.org, Sean Christopherson References: <20200319091407.1481-56-joro@8bytes.org> <20200424210316.848878-1-mstunes@vmware.com> <2c49061d-eb84-032e-8dcb-dd36a891ce90@intel.com> From: Tom Lendacky Message-ID: Date: Fri, 24 Apr 2020 16:27:32 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 In-Reply-To: <2c49061d-eb84-032e-8dcb-dd36a891ce90@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SN6PR01CA0035.prod.exchangelabs.com (2603:10b6:805:b6::48) To DM6PR12MB3163.namprd12.prod.outlook.com (2603:10b6:5:15e::26) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from office-linux.texastahm.com (67.79.209.213) by SN6PR01CA0035.prod.exchangelabs.com (2603:10b6:805:b6::48) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2937.13 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: 467goDWZkBEpkhxfDCvcgqEtMW+Lim/F49AB/25Xqk/MsCPCyh+eNLBZGw8qn2J4p1GGXovUvNCflRpjhTwJaFdztA/1m6BbF8N0gLbhs3U3yv1AIt8lXWRY5DZhy0a/W/nW2PMN32OaoGdKrjsv6gCAoAqBsePjUQNG/FJbJkxEKsJfnRyU2D9MWGa98Tt7thgg3xrVg4ZFPedq7RaR2Mg8rHOTPSc4VIyAHTsfjnRZNzoPC+g/DNbtgOHqs3e/aqELCZk87+2S957dR9seNnZvPxf0bAh8BMprnYFMGsbUtgjSrxjxwxOka+lyp0ZweVwlWAxL3ZlIWKDvJhjISOQE02YOh8DZ/Rjn/aRsSafzaJN5yi6dRXsw0RDndh0aUy2xhlGGz7+5NKLOPmcgVDKraSa5yLtBLzRa9gSSGBT7TQQnvr1y6TlCqjRQ4fY+ X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: bd7ab3d7-0a07-41bc-b92e-08d7e8964e35 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Apr 2020 21:27:35.2595 (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: K9RXoA/3AHh87XPc4HN4aYawXMIxeB/Dbz3DJ/H5rJI0aZiNqtWaU6bviMUqO91ugEJUoULYKTPZNpxvVfdLRw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB3562 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/24/20 4:24 PM, Dave Hansen wrote: > On 4/24/20 2:03 PM, Mike Stunes wrote: >> I needed to allow RDTSC(P) from userspace and in early boot in order to >> get userspace started properly. Patch below. >> >> --- >> SEV-ES guests will need to execute rdtsc and rdtscp from userspace and >> during early boot. Move the rdtsc(p) #VC handler into common code and >> extend the #VC handlers. > > Do SEV-ES guests _always_ #VC on rdtsc(p)? Only if the hypervisor is intercepting those instructions. Thanks, Tom >