From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Liu Subject: Re: [PATCH 10/10] x86/spec_ctrl: Elide MSR_SPEC_CTRL handling in idle context when possible Date: Wed, 16 May 2018 12:28:27 +0100 Message-ID: <20180516112827.ocdvskp4lpnkmjwr@citrix.com> References: <1526035094-14343-1-git-send-email-andrew.cooper3@citrix.com> <1526035094-14343-11-git-send-email-andrew.cooper3@citrix.com> <20180514154849.uwddevkj2d4ggucg@citrix.com> <2ebd18f8-52a4-4b90-1264-6465206aad90@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <2ebd18f8-52a4-4b90-1264-6465206aad90@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Andrew Cooper Cc: Juergen Gross , Roger Pau =?iso-8859-1?Q?Monn=E9?= , Wei Liu , Jan Beulich , Xen-devel List-Id: xen-devel@lists.xenproject.org T24gV2VkLCBNYXkgMTYsIDIwMTggYXQgMTI6Mjc6MjlQTSArMDEwMCwgQW5kcmV3IENvb3BlciB3 cm90ZToKPiBPbiAxNC8wNS8xOCAxNjo0OCwgV2VpIExpdSB3cm90ZToKPiA+IE9uIEZyaSwgTWF5 IDExLCAyMDE4IGF0IDExOjM4OjE0QU0gKzAxMDAsIEFuZHJldyBDb29wZXIgd3JvdGU6Cj4gPj4g SWYgWGVuIGlzIHZpcnR1YWxpc2luZyBNU1JfU1BFQ19DVFJMIGhhbmRsaW5nIGZvciBndWVzdHMs IGJ1dCB1c2luZyAwIGFzIGl0cwo+ID4+IG93biBNU1JfU1BFQ19DVFJMIHZhbHVlLCBzcGVjX2N0 cmxfe2VudGVyLGV4aXR9X2lkbGUoKSBuZWVkIG5vdCB3cml0ZSB0byB0aGUKPiA+PiBNU1IuCj4g Pj4KPiA+PiBSZXF1ZXN0ZWQtYnk6IEphbiBCZXVsaWNoIDxKQmV1bGljaEBzdXNlLmNvbT4KPiA+ PiBTaWduZWQtb2ZmLWJ5OiBBbmRyZXcgQ29vcGVyIDxhbmRyZXcuY29vcGVyM0BjaXRyaXguY29t Pgo+ID4+IC0tLQo+ID4+IENDOiBKYW4gQmV1bGljaCA8SkJldWxpY2hAc3VzZS5jb20+Cj4gPj4g Q0M6IFdlaSBMaXUgPHdlaS5saXUyQGNpdHJpeC5jb20+Cj4gPj4gQ0M6IFJvZ2VyIFBhdSBNb25u w6kgPHJvZ2VyLnBhdUBjaXRyaXguY29tPgo+ID4+IENDOiBKdWVyZ2VuIEdyb3NzIDxqZ3Jvc3NA c3VzZS5jb20+Cj4gPj4gLS0tCj4gPj4gIHhlbi9hcmNoL3g4Ni9zcGVjX2N0cmwuYyAgICAgICAg ICB8IDQgKysrKwo+ID4+ICB4ZW4vaW5jbHVkZS9hc20teDg2L2NwdWZlYXR1cmVzLmggfCAxICsK PiA+PiAgeGVuL2luY2x1ZGUvYXNtLXg4Ni9zcGVjX2N0cmwuaCAgIHwgOCArKy0tLS0tLQo+ID4+ ICAzIGZpbGVzIGNoYW5nZWQsIDcgaW5zZXJ0aW9ucygrKSwgNiBkZWxldGlvbnMoLSkKPiA+Pgo+ ID4+IGRpZmYgLS1naXQgYS94ZW4vYXJjaC94ODYvc3BlY19jdHJsLmMgYi94ZW4vYXJjaC94ODYv c3BlY19jdHJsLmMKPiA+PiBpbmRleCBhMjMyOGJkLi5mNGEzMTY1IDEwMDY0NAo+ID4+IC0tLSBh L3hlbi9hcmNoL3g4Ni9zcGVjX2N0cmwuYwo+ID4+ICsrKyBiL3hlbi9hcmNoL3g4Ni9zcGVjX2N0 cmwuYwo+ID4+IEBAIC01MjYsNiArNTI2LDEwIEBAIHZvaWQgX19pbml0IGluaXRfc3BlY3VsYXRp b25fbWl0aWdhdGlvbnModm9pZCkKPiA+PiAgICAgIC8qIChSZSlpbml0IEJTUCBzdGF0ZSBub3cg dGhhdCBkZWZhdWx0X3NwZWNfY3RybF9mbGFncyBoYXMgYmVlbiBjYWxjdWxhdGVkLiAqLwo+ID4+ ICAgICAgaW5pdF9zaGFkb3dfc3BlY19jdHJsX3N0YXRlKCk7Cj4gPj4gIAo+ID4+ICsgICAgLyog SWYgWGVuIGlzIHVzaW5nIGFueSBNU1JfU1BFQ19DVFJMIHNldHRpbmdzLCBhZGp1c3QgdGhlIGlk bGUgcGF0aC4gKi8KPiA+PiArICAgIGlmICggZGVmYXVsdF94ZW5fc3BlY19jdHJsICkKPiA+PiAr ICAgICAgICBzZXR1cF9mb3JjZV9jcHVfY2FwKFg4Nl9GRUFUVVJFX1NDX01TUl9JRExFKTsKPiA+ PiArCj4gPj4gICAgICB4cHRpX2luaXRfZGVmYXVsdChmYWxzZSk7Cj4gPj4gICAgICBpZiAoIG9w dF94cHRpID09IDAgKQo+ID4+ICAgICAgICAgIHNldHVwX2ZvcmNlX2NwdV9jYXAoWDg2X0ZFQVRV UkVfTk9fWFBUSSk7Cj4gPj4gZGlmZiAtLWdpdCBhL3hlbi9pbmNsdWRlL2FzbS14ODYvY3B1ZmVh dHVyZXMuaCBiL3hlbi9pbmNsdWRlL2FzbS14ODYvY3B1ZmVhdHVyZXMuaAo+ID4+IGluZGV4IDlk NWQ4MWUuLmI5MGFhMmQgMTAwNjQ0Cj4gPj4gLS0tIGEveGVuL2luY2x1ZGUvYXNtLXg4Ni9jcHVm ZWF0dXJlcy5oCj4gPj4gKysrIGIveGVuL2luY2x1ZGUvYXNtLXg4Ni9jcHVmZWF0dXJlcy5oCj4g Pj4gQEAgLTMxLDMgKzMxLDQgQEAgWEVOX0NQVUZFQVRVUkUoU0NfTVNSX0hWTSwgICAgICAoRlND QVBJTlRTKzApKjMyKzE3KSAvKiBNU1JfU1BFQ19DVFJMIHVzZWQgYnkgWGUKPiA+PiAgWEVOX0NQ VUZFQVRVUkUoU0NfUlNCX1BWLCAgICAgICAoRlNDQVBJTlRTKzApKjMyKzE4KSAvKiBSU0Igb3Zl cndyaXRlIG5lZWRlZCBmb3IgUFYgKi8KPiA+PiAgWEVOX0NQVUZFQVRVUkUoU0NfUlNCX0hWTSwg ICAgICAoRlNDQVBJTlRTKzApKjMyKzE5KSAvKiBSU0Igb3ZlcndyaXRlIG5lZWRlZCBmb3IgSFZN ICovCj4gPj4gIFhFTl9DUFVGRUFUVVJFKE5PX1hQVEksICAgICAgICAgKEZTQ0FQSU5UUyswKSoz MisyMCkgLyogWFBUSSBtaXRpZ2F0aW9uIG5vdCBpbiB1c2UgKi8KPiA+PiArWEVOX0NQVUZFQVRV UkUoU0NfTVNSX0lETEUsICAgICAoRlNDQVBJTlRTKzApKjMyKzIxKSAvKiAoU0NfTVNSX1BWIHx8 IFNDX01TUl9IVk0pICYmIGRlZmF1bHRfeGVuX3NwZWNfY3RybCAqLwo+ID4gSSBkb24ndCBmb2xs b3c6IHRoZSBjb2RlIGFib3ZlIG9ubHkgZGVwZW5kcyBvbiBkZWZhdWx0X3hlbl9zcGVjX2N0cmwg YnV0Cj4gPiB0aGUgY29tbWVudCBzYXlzIFNDX01TUl9QViBhbmQgU0NfTVNSX0hWTSBhcmUgYWxz byB0YWtlbiBpbnRvCj4gPiBjb25zaWRlcmF0aW9uLgo+IAo+IGRlZmF1bHRfeGVuX3NwZWNfY3Ry bCBpcyBvbmx5IGV2ZXIgbm9uemVybyB3aGVuIFNDX01TUl9QViBvciBTQ19NU1JfSFZNCj4gaXMg c2V0LsKgIEluIHByaW5jaXBsZSwgSSBjb3VsZCBhc3NlcnQgdGhhdCBvbmUgb2YgdGhlIHR3byBp cyBzZXQuCj4gCj4gSSBoYXZlIHBocmFzZWQgaXQgbGlrZSB0aGlzIGJlY2F1c2UgaXQgaXMgZ29p bmcgdG8gYmVjb21lIHJhdGhlciBtb3JlCj4gY29tcGxpY2F0ZWQgKHRoYW4gIT0gMCkgd2hlbiBh ZGRpbmcgSUJSU19BVFQgbW9kZS4KCk9LLCB0aGFua3MgZm9yIGV4cGxhaW5pbmcuCgpXZWkuCgpf X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwg bWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3Rz LnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs