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Wed, 3 Jul 2024 20:14:12 +0000 Message-ID: <8a34f1d4-9f43-4fa7-9566-144b5eeda4d9@intel.com> Date: Wed, 3 Jul 2024 13:14:09 -0700 User-Agent: Mozilla Thunderbird Subject: Re: VMX Preemption Timer appears to be buggy on SKX, CLX, and ICX To: Sean Christopherson CC: , , , , , , , , , , , , , "Hao, Xudong" References: <2fccf35715b5ba8aec5e5708d86ad7015b8d74e6.1718214999.git.reinette.chatre@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0032.namprd04.prod.outlook.com (2603:10b6:303:6a::7) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|BL1PR11MB6001:EE_ X-MS-Office365-Filtering-Correlation-Id: 71d75af6-1675-470e-194f-08dc9b9cb44e X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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>> + /* Check if measured frequency is within 1% of configured frequency. */ >> + GUEST_ASSERT(freq < apic_hz * 101 / 100); >> + GUEST_ASSERT(freq > apic_hz * 99 / 100); >> + } > > This test fails on our SKX, CLX, and ICX systems due to what appears to be a CPU > bug. It looks like something APICv related is clobbering internal VMX timer state? > Or maybe there's a tearing or truncation issue? It has been a few days. Just a note to let you know that we are investigating this. On my side I have not yet been able to reproduce this issue. I tested kvm-x86-next-2024.06.28 on an ICX and an CLX system by running 100 iterations of apic_bus_clock_test and they all passed. Since I have lack of experience here there are some Intel virtualization experts helping out with this investigation and I hope that they will be some insights from the analysis and testing that you already provided. Reinette