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Thu, 1 Aug 2024 10:06:35 +0000 Message-ID: Date: Thu, 1 Aug 2024 15:36:10 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] target/i386: Always set leaf 0x1f Content-Language: en-GB To: Xiaoyao Li , John Levon Cc: Igor Mammedov , qemu-devel@nongnu.org, berrange@redhat.com, zhao1.liu@intel.com, pbonzini@redhat.com, bob.ball@nutanix.com, prerna.saxena@nutanix.com References: <20240724075226.212882-1-manish.mishra@nutanix.com> <20240724110004.389c1a0c@imammedo.users.ipa.redhat.com> <21ca5c19-677b-4fac-84d4-72413577f260@nutanix.com> <6e65dbb2-461e-44f4-842c-249c7b333885@intel.com> From: Manish In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MA0PR01CA0054.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:ac::6) To SA0PR02MB7386.namprd02.prod.outlook.com (2603:10b6:806:d9::19) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA0PR02MB7386:EE_|CO1PR02MB8491:EE_ X-MS-Office365-Filtering-Correlation-Id: c2cdfe50-f6c9-40a8-cbf7-08dcb211a00c x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|52116014; 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envelope-from=manish.mishra@nutanix.com; helo=mx0a-002c1b01.pphosted.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.126, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 31/07/24 9:01 pm, Xiaoyao Li wrote: > !-------------------------------------------------------------------| >  CAUTION: External Email > > |-------------------------------------------------------------------! > > On 7/31/2024 4:49 PM, John Levon wrote: >> On Wed, Jul 31, 2024 at 03:02:15PM +0800, Xiaoyao Li wrote: >> >>>> Windows does not expect 0x1f to be present for any CPU model. But >>>> if it >>>> is exposed to the guest, it expects non-zero values. >>> >>> Please fix Windows! >> >> A ticket has been filed with MSFT, we are aware this is a guest bug. >> >> But that doesn't really help anybody trying to use Windows right now. > > For existing buggy Windows, we can still introduce > "cpuid-0x1f-enforce" but not make it default on. > > People want to boot the buggy Windows needs to opt-in it themselves > via "-cpu xxx,cpuid-0x1f-enforce=on". This way, we don't have live > migration issue and it doesn't affect anything. Yes, that makes sense, I will send a updated patch by tomorrow if no one has any objection with this. > >> regards >> john Thanks Manish Mishra