From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: Re: [PATCH v9 02/11] x86/cpuid: Handling of IBRS/IBPB, STIBP and IBRS for guests Date: Fri, 19 Jan 2018 10:53:29 +0000 Message-ID: <86dc061f-afa7-b260-b096-b6efbf464dec@citrix.com> References: <1516290370-14958-1-git-send-email-andrew.cooper3@citrix.com> <1516290370-14958-3-git-send-email-andrew.cooper3@citrix.com> <5A61D91102000078001A0481@prv-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <5A61D91102000078001A0481@prv-mh.provo.novell.com> Content-Language: en-GB List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Jan Beulich Cc: Xen-devel List-Id: xen-devel@lists.xenproject.org T24gMTkvMDEvMTggMTA6NDAsIEphbiBCZXVsaWNoIHdyb3RlOgo+Pj4+IE9uIDE4LjAxLjE4IGF0 IDE2OjQ2LCA8YW5kcmV3LmNvb3BlcjNAY2l0cml4LmNvbT4gd3JvdGU6Cj4+IEZvciBndWVzdCBz YWZldHksIHdlIHRyZWF0IFNUSUJQIGFzIHNwZWNpYWwsIGFsd2F5cyBvdmVycmlkZSB0aGUgdG9v bHN0YWNrCj4+IGNob2ljZSwgYW5kIGFsd2F5cyBhZHZlcnRpc2UgU1RJQlAgaWYgSUJSUyBpcyBh dmFpbGFibGUuICBUaGlzIHJlbW92ZXMgdGhlCj4+IGNvcm5lciBjYXNlIHdoZXJlIFNUSUJQIGlz IG5vdCBhZHZlcnRpc2VkLCBidXQgdGhlIGd1ZXN0IGlzIHJ1bm5pbmcgb24KPj4gSFQtY2FwYWJs ZSBoYXJkd2FyZSB3aGVyZSBpdCBkb2VzIG1hdHRlci4KPiBJIGd1ZXNzIHRoZSBhbnN3ZXIgdG8g bXkgcXVlc3Rpb24gbWF5IGxpdmUgc29tZXdoZXJlIGxhdGVyIGluIHRoZQo+IHNlcmllcywgYnV0 IHNpbmNlIEkgaGF2ZW4ndCBnb3QgdGhlcmUgeWV0OiBJcyB0aGlzIGJhc2VkIG9uIHRoZQo+IGFz c3VtcHRpb24gdGhhdCBvbiBIVC1jYXBhYmxlIGhhcmR3YXJlIHRoZXkgd291bGQgYWx3YXlzIGJl Cj4gYXZhaWxhYmxlIHRvZ2V0aGVyPyBPdGhlcndpc2UsIGhvdyBkbyB5b3UgZW11bGF0ZSBTVElC UCBmb3IgdGhlCj4gZ3Vlc3QgaWYgYWxsIHlvdSd2ZSBnb3QgaXMgSUJSUy9JQlBCPwoKVGhlIHNh ZmV0eSBkZXBlbmRzIG9uIHRoZSBndWVzdCBzZWVpbmcgU1RJQlAgYW5kIHVzaW5nIGl0IGlmIGl0 IHdhbnRzCnRvLsKgIChOb3QgdGhhdCBJJ3ZlIHNlZW4gYW55IHNpZ24gb2YgU1RJQlAgaW4gdGhl IExpbnV4IGNvZGUsIG9yIGZyb20Kb2JzZXJ2aW5nIHdoYXQgV2luZG93cyBhcHBlYXJzIHRvIGRv KS4KCkZvciB0b3BvbG9neSByZWFzb25zIChkZXNwaXRlIHRoZSBvdGhlciBjYW5zIG9mIHdvcm1z IGluIHRoaXMgYXJlYSksIHdlCnVuaWxhdGVyYWxseSBzZXQgSFQsIHNvIGFsbCBndWVzdHMgc2hv dWxkIGZpbmQgdGhlbXNlbHZlcyBvbiBIVC1jYXBhYmxlCnN5c3RlbXMuCgo+Cj4+IC0tLSBhL3hl bi9hcmNoL3g4Ni9jcHVpZC5jCj4+ICsrKyBiL3hlbi9hcmNoL3g4Ni9jcHVpZC5jCj4+IEBAIC0z ODMsNiArMzgzLDE2IEBAIHN0YXRpYyB2b2lkIF9faW5pdCBjYWxjdWxhdGVfcHZfbWF4X3BvbGlj eSh2b2lkKQo+PiAgICAgIC8qIFVuY29uZGl0aW9uYWxseSBjbGFpbSB0byBiZSBhYmxlIHRvIHNl dCB0aGUgaHlwZXJ2aXNvciBiaXQuICovCj4+ICAgICAgX19zZXRfYml0KFg4Nl9GRUFUVVJFX0hZ UEVSVklTT1IsIHB2X2ZlYXR1cmVzZXQpOwo+PiAgCj4+ICsgICAgLyogT24gaGFyZHdhcmUgd2l0 aCBJQlJTL0lCUEIgc3VwcG9ydCwgdGhlcmUgYXJlIGZ1cnRoZXIgYWRqdXN0bWVudHMuICovCj4+ ICsgICAgaWYgKCB0ZXN0X2JpdChYODZfRkVBVFVSRV9JQlJTQiwgcHZfZmVhdHVyZXNldCkgKQo+ PiArICAgIHsKPj4gKyAgICAgICAgLyogT2ZmZXIgU1RJQlAgdW5jb25kaXRpb25hbGx5LiAgSXQg aXMgYSBub3Agb24gbm9uLUhUIGhhcmR3YXJlLiAqLwo+PiArICAgICAgICBfX3NldF9iaXQoWDg2 X0ZFQVRVUkVfU1RJQlAsIHB2X2ZlYXR1cmVzZXQpOwo+PiArCj4+ICsgICAgICAgIC8qIEFNRCdz IElCUEIgaXMgYSBzdWJzZXQgb2YgSUJSUy9JQlBCLiAqLwo+PiArICAgICAgICBfX3NldF9iaXQo WDg2X0ZFQVRVUkVfSUJQQiwgcHZfZmVhdHVyZXNldCk7Cj4+ICsgICAgfQo+PiArCj4+ICAgICAg c2FuaXRpc2VfZmVhdHVyZXNldChwdl9mZWF0dXJlc2V0KTsKPj4gICAgICBjcHVpZF9mZWF0dXJl c2V0X3RvX3BvbGljeShwdl9mZWF0dXJlc2V0LCBwKTsKPj4gICAgICByZWNhbGN1bGF0ZV94c3Rh dGUocCk7Cj4+IEBAIC00NDAsNiArNDUwLDE2IEBAIHN0YXRpYyB2b2lkIF9faW5pdCBjYWxjdWxh dGVfaHZtX21heF9wb2xpY3kodm9pZCkKPj4gICAgICAgICAgICAgIF9fY2xlYXJfYml0KFg4Nl9G RUFUVVJFX1hTQVZFUywgaHZtX2ZlYXR1cmVzZXQpOwo+PiAgICAgIH0KPj4gIAo+PiArICAgIC8q IE9uIGhhcmR3YXJlIHdpdGggSUJSUy9JQlBCIHN1cHBvcnQsIHRoZXJlIGFyZSBmdXJ0aGVyIGFk anVzdG1lbnRzLiAqLwo+PiArICAgIGlmICggdGVzdF9iaXQoWDg2X0ZFQVRVUkVfSUJSU0IsIGh2 bV9mZWF0dXJlc2V0KSApCj4+ICsgICAgewo+PiArICAgICAgICAvKiBPZmZlciBTVElCUCB1bmNv bmRpdGlvbmFsbHkuICBJdCBpcyBhIG5vcCBvbiBub24tSFQgaGFyZHdhcmUuICovCj4+ICsgICAg ICAgIF9fc2V0X2JpdChYODZfRkVBVFVSRV9TVElCUCwgaHZtX2ZlYXR1cmVzZXQpOwo+PiArCj4+ ICsgICAgICAgIC8qIEFNRCdzIElCUEIgaXMgYSBzdWJzZXQgb2YgSUJSUy9JQlBCLiAqLwo+PiAr ICAgICAgICBfX3NldF9iaXQoWDg2X0ZFQVRVUkVfSUJQQiwgaHZtX2ZlYXR1cmVzZXQpOwo+PiAr ICAgIH0KPiBBcyBsb25nIGFzIHdlIGRvbid0IGV4cGVjdCB0aGlzIGxvZ2ljIHRvIGdyb3csIGhh dmluZyBpdCBkdXBsaWNhdGVkCj4gbGlrZSB0aGlzIGlzIHByb2JhYmx5IGZpbmUuIE90aGVyd2lz ZSBhIGhlbHBlciBmdW5jdGlvbiBtaWdodCBiZQo+IGJldHRlci4KCkknbGwgc2VlIGFib3V0IHRo aXMgd2hlbiBJIGdldCBiYWNrIHRvIHRoZSBDUFVJRCB3b3JrLsKgIFRoZXJlIHByb2JhYmx5Cndp bGwgYmUgb3RoZXJzIGFjdGlvbnMgd2hpY2ggYXJlIGNvbW1vbiBhY3Jvc3MgZ3Vlc3QgdHlwZXMs IHNvIGEgaGVscGVyCmlzIHByb2JhYmx5IHdvcnRod2hpbGUsIGJ1dCBzb21lIGJpdHMgb2YgdGhp cyB3aWxsIGNoYW5nZSB3aGVuIHdlIGV4cG9zZQpmdWxsIGNwdWlkX3BvbGljaWVzIHRvIHRoZSB0 b29sc3RhY2suCgp+QW5kcmV3CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW5wcm9q ZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGluZm8veGVu LWRldmVs