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mx.microsoft.com 1; spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.onmicrosoft.com; s=selector2-citrix-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=bp6uXK5EQx2tinS2k5rBse7bcwefxSb7M+RGMrG/nBM=; b=BEFYpl9+V+GqiHMYl6lX7CExSHfbdCu8gk0+N0gvZgi3Wg4IjiW7fU6UCOJxFjaqN9z/uYuBMk33V+cErEK5FKlAyojOVSNIDPgtI60QgYjB/TibpiO0c1ewtA9+YJYiTx2la3dKdWyQPxVbRsOBEyol7e6ngjSTW9M1L/h9ulQ= Subject: Re: [PATCH v7 05/10] x86/vmx: Add Intel Processor Trace support To: Jan Beulich CC: =?UTF-8?Q?Micha=c5=82_Leszczy=c5=84ski?= , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Wei Liu , Jun Nakajima , Kevin Tian , Tamas K Lengyel , Xen-devel References: <20210121212718.2441-1-andrew.cooper3@citrix.com> <20210121212718.2441-6-andrew.cooper3@citrix.com> <9fa8ff47-cd09-a09b-6d62-bb47f72c3847@suse.com> From: Andrew Cooper Message-ID: Date: Fri, 29 Jan 2021 22:08:06 +0000 User-Agent: Mozilla/5.0 (X11; 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X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?MWZjOWVWeHA0Yjl4dXRCWUJLMVNwc3l5VnF3RmRKNktOaHhoQWdZWGdGL1Iy?= =?utf-8?B?TnpIMXVSbWtrcGN4a2hqai9vUUNNcXlIckRwZzBwaDlmYmVUSzRUeGNkZlBM?= =?utf-8?B?cFRwVVpnSzJvd3lXKzhCeG02SGZRT3lHYkhHTExCMHhac05GR01RaDhQbTJH?= =?utf-8?B?ejNOeEZLT0JscUlvakppMWV6SFpraXJjaUtMZW1YLzZmaklhNU1kOERzYURW?= =?utf-8?B?Y0VTSjM4NHRjMmtsNnphSHc0U0dlWEo1bVBZRHhBZ2J0M1BzVk9qOEg0VUFB?= =?utf-8?B?dUEvLzExd2xPcFhPeXBlQ0tZVzY1RVNnbFJKM3VxVWdhYzFnSFNOaHQyK1Zv?= =?utf-8?B?a1BhOUNITjljNjBrK29LMGxEVFp1eFU2T1dBTkxNZXMzMjFBUXhlVXlmZG04?= =?utf-8?B?cFVNZVdZRkREZHNqc21scXNOdlBFdHRTcXpwRm95N3lOTVR6TjRkekd1eGdJ?= =?utf-8?B?L295VEEzSStUZDNEQzZ2Z1dHWFBROUt2ZndhUVpVK1Z1U0VXbFRiUlVqeWFC?= =?utf-8?B?WTVSOWc5a1EzRzlLTmwxcDQvUDM2UnJxUFN0T3hrWkgrd0FUZjBsTUhFcnBP?= =?utf-8?B?NUxYbHgrSkFUU1hJeDVTY2pUbnY0YUNJdGE1d2dLNkhIRjhYY2FDZG1FMzYr?= =?utf-8?B?OUpsbERIMnQ0bmo5MjVRU093cmZvZjhZRnFOUTRrUXdtT1JSRExOV0VuZ2li?= =?utf-8?B?MFF4NThCNmxOWkRWdlMvUUVHajBtVGJYU2Zmb2pKNk43NUhOalhsS2Q0bGZY?= =?utf-8?B?eGhIT1lRWnBjcnNnWEYyaWhiajNIdkJ1bXZPMHRaQ0luT2Y2MFN3bFZsZXNM?= =?utf-8?B?RTdDaXIvQUpEN2p6Q0dBdnhxdXl6b3hFU0M5alRaNlVJZCtudmp2UVIvWUx4?= =?utf-8?B?ck16cFNqVW1VcFd2MCtSemZhc0g3MkR4d0lodEhodDEyanZlRkgrcmpBRVEr?= =?utf-8?B?N0tMUGtxZU13SUxvTDhtQXRTYWlTd2FQN1FXQmNRZkFTM2diRDF4TnpTV1NR?= =?utf-8?B?anNoTHNlYXI0WHFZRVFmN0lDeGIyYmNORjdPUnBYblRzc2FYUXVVQnpiOHAw?= =?utf-8?B?djRibjFZSHlBUDNuS2N1MEp6Znd4bURyYzBQMTlQNDlCZVFFOXVpTlpxdG9l?= =?utf-8?B?bnMxbE9TSXEzWmxIT1A4RE45bEZOMXBJYXFwYUNSU1k2bi9XRXZpVE9SYzhp?= =?utf-8?B?Rmx0WCs2QU9QUVJQVGNDbWx4UFhicGE5STI0VSt3VHd6NVUzTG50YjVCc3lL?= =?utf-8?B?VFJrcE9DRlViWko2RnpaVFlkQlBDTnVURnRGS1kzWm5XUlBKRUlLc3BpTUFQ?= =?utf-8?B?eVJHb2JTdkYrbDRQaW1MQUxlMkZwcmFKYXdhMkpjdGY4c2szd0FYOElpazBV?= =?utf-8?B?SEhoZk12UWIvdXRnT3F0Ui9kQWsvOUYwODVsZmxEMDNYV1hRaGFkVXVNN2F3?= =?utf-8?B?TWVCeU1udG9obTY2VFBVWlZlb1I4eWFtUUpNbFdBPT0=?= X-MS-Exchange-CrossTenant-Network-Message-Id: 8cdd6eda-04ce-45fb-080c-08d8c4a25eeb X-MS-Exchange-CrossTenant-AuthSource: BYAPR03MB4728.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jan 2021 22:08:13.0871 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: KNCVCl2kZtfCuL3kGwKRvqNp5VA0zbHjM77S++c2lPpWVlh1n1j3FF20Yezg7CCrMruSB8O/qxNjGfErMInoi/ll5rTp8UBYp4pv6yC1g74= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR03MB5268 X-OriginatorOrg: citrix.com On 26/01/2021 13:35, Jan Beulich wrote: > On 21.01.2021 22:27, Andrew Cooper wrote: >> --- a/xen/include/asm-x86/msr.h >> +++ b/xen/include/asm-x86/msr.h >> @@ -306,6 +306,38 @@ struct vcpu_msrs >> }; >> } misc_features_enables; >> >> + /* >> + * 0x00000560 ... 57x - MSR_RTIT_* >> + * >> + * "Real Time Instruction Trace", now called Processor Trace. >> + * >> + * These MSRs are not exposed to guests. They are controlled by Xen >> + * behind the scenes, when vmtrace is enabled for the domain. >> + * >> + * MSR_RTIT_OUTPUT_BASE not stored here. It is fixed per vcpu, and >> + * derived from v->vmtrace.buf. >> + */ >> + struct { >> + /* >> + * Placed in the MSR load/save lists. Only modified by hypercall in >> + * the common case. >> + */ >> + uint64_t ctl; > IIUC this field will be used by subsequent patches only? Correct. ~Andrew