From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: Re: [PATCH 1/4] x86: suppress XPTI-related TLB flushes when possible Date: Wed, 3 Apr 2019 19:52:50 +0100 Message-ID: References: <5C88F524020000780021E12C@prv1-mh.provo.novell.com> <5C88F9B0020000780021E177@prv1-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hBl0J-0001iF-Om for xen-devel@lists.xenproject.org; Wed, 03 Apr 2019 18:52:55 +0000 In-Reply-To: <5C88F9B0020000780021E177@prv1-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 , xen-devel Cc: George Dunlap , Wei Liu , Roger Pau Monne List-Id: xen-devel@lists.xenproject.org T24gMTMvMDMvMjAxOSAxMjozOCwgSmFuIEJldWxpY2ggd3JvdGU6Cj4gV2hlbiB0aGVyZSdzIG5v IFhQVEktZW5hYmxlZCBQViBkb21haW4gYXQgYWxsLCB0aGVyZSdzIG5vIG5lZWQgdG8gaXNzdWUK PiByZXNwZWN0aXZlIFRMQiBmbHVzaGVzLiBIYXJkd2lyZSBvcHRfeHB0aV8qIHRvIGZhbHNlIHdo ZW4gIVBWLCBhbmQKPiByZWNvcmQgdGhlIGNyZWF0aW9uIG9mIFBWIGRvbWFpbnMgYnkgYnVtcGlu ZyBvcHRfeHB0aV8qIGFjY29yZGluZ2x5Lgo+Cj4gU2lnbmVkLW9mZi1ieTogSmFuIEJldWxpY2gg PGpiZXVsaWNoQHN1c2UuY29tPgo+IC0tLQo+IFRCRDogVGhlIGhhcmR3aXJpbmcgdG8gZmFsc2Ug Y291bGQgYmUgZXh0ZW5kZWQgdG8gb3B0X3B2X2wxdGZfKiBhbmQgKGZvcgo+ICAgICAgIUhWTSkg b3B0X2wxZF9mbHVzaCBhcyB3ZWxsLgoKRm9yIHdoYXQgcHVycG9zZT/CoCBvcHRfcHZfbDF0Zl8q IGlzIG9ubHkgcmVhZCBpbnNpZGUgYSBDT05GSUdfUFYgc2VjdGlvbgooZGVzcGl0ZSBob3cgcHZf bDF0Zl9kb21haW5faW5pdCgpIGlzIGxhaWQgb3V0IC0gdGhlcmUgaXMgYW4gb3V0ZXIgaWZkZWYK YXMgd2VsbCksIHdoaWxlIG9wdF9sMWRfZmx1c2ggaW5mbHVlbmNlcyB0aGUgY29udGVudHMgb2Yg dGhlIGd1ZXN0cyBNU1IKbG9hZCBsaXN0LCB3aGljaCBpcyBpbmhlcmVudGx5IFZULXggb25seS4K Cj4gLS0tIGEveGVuL2FyY2gveDg2L3B2L2RvbWFpbi5jCj4gKysrIGIveGVuL2FyY2gveDg2L3B2 L2RvbWFpbi5jCj4gQEAgLTI3MCw2ICsyNzAsOSBAQCB2b2lkIHB2X2RvbWFpbl9kZXN0cm95KHN0 cnVjdCBkb21haW4gKmQpCj4gICAgICBkZXN0cm95X3BlcmRvbWFpbl9tYXBwaW5nKGQsIEdEVF9M RFRfVklSVF9TVEFSVCwKPiAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgR0RUX0xEVF9N QllURVMgPDwgKDIwIC0gUEFHRV9TSElGVCkpOwo+ICAKPiArICAgIG9wdF94cHRpX2h3ZG9tIC09 IElTX0VOQUJMRUQoQ09ORklHX0xBVEVfSFdET00pICYmCj4gKyAgICAgICAgICAgICAgICAgICAg ICAhZC0+ZG9tYWluX2lkICYmIG9wdF94cHRpX2h3ZG9tOwo+ICsKPiAgICAgIFhGUkVFKGQtPmFy Y2gucHYuY3B1aWRtYXNrcyk7Cj4gIAo+ICAgICAgRlJFRV9YRU5IRUFQX1BBR0UoZC0+YXJjaC5w di5nZHRfbGR0X2wxdGFiKTsKPiBAQCAtMzA4LDcgKzMxMSwxNiBAQCBpbnQgcHZfZG9tYWluX2lu aXRpYWxpc2Uoc3RydWN0IGRvbWFpbiAqCj4gICAgICAvKiA2NC1iaXQgUFYgZ3Vlc3QgYnkgZGVm YXVsdC4gKi8KPiAgICAgIGQtPmFyY2guaXNfMzJiaXRfcHYgPSBkLT5hcmNoLmhhc18zMmJpdF9z aGluZm8gPSAwOwo+ICAKPiAtICAgIGQtPmFyY2gucHYueHB0aSA9IGlzX2hhcmR3YXJlX2RvbWFp bihkKSA/IG9wdF94cHRpX2h3ZG9tIDogb3B0X3hwdGlfZG9tdTsKPiArICAgIGlmICggaXNfaGFy ZHdhcmVfZG9tYWluKGQpICYmIG9wdF94cHRpX2h3ZG9tICkKPiArICAgIHsKPiArICAgICAgICBk LT5hcmNoLnB2LnhwdGkgPSB0cnVlOwo+ICsgICAgICAgICsrb3B0X3hwdGlfaHdkb207Cj4gKyAg ICB9Cj4gKyAgICBpZiAoICFpc19oYXJkd2FyZV9kb21haW4oZCkgJiYgb3B0X3hwdGlfZG9tdSAp Cj4gKyAgICB7Cj4gKyAgICAgICAgZC0+YXJjaC5wdi54cHRpID0gdHJ1ZTsKPiArICAgICAgICBv cHRfeHB0aV9kb211ID0gMjsKClRoaXMgbG9naWMgaXMgYXN5bWV0cmljLsKgIFdlIHdpbGwgcmV0 YWluIFRMQiBmbHVzaGluZyBhZnRlciB0aGUgZmluYWwKZG9tdSBoYXMgc2h1dCBkb3duLgoKSSdt IGFsc28gbm90IHN1cmUgYWJvdXQgdGhlIGh3ZG9tIGxvZ2ljLsKgIFRoZXJlIGlzIGd1YXJhbnRl ZWQgdG8gYmUKZXhhY3RseSBvbmUsIGFuZCBYZW4gd2lsbCBzaHV0IGRvd24gd2hlbiBpdCBnb2Vz IG9mZmxpbmUsIGJ1dCBpdCBtYXkgbm90CmJlIGEgUFYgZ3Vlc3QuwqAgb3B0X3hwdGlfaHdkb20g c2hvdWxkIGJlIHVuY29uZGl0aW9uYWxseSAyIG9uIHRoaXMgcGF0aAooSSB0aGluaykuCgo+IC0t LSBhL3hlbi9pbmNsdWRlL2FzbS14ODYvc3BlY19jdHJsLmgKPiArKysgYi94ZW4vaW5jbHVkZS9h c20teDg2L3NwZWNfY3RybC5oCj4gQEAgLTQyLDcgKzQyLDEyIEBAIGV4dGVybiBib29sIGJzcF9k ZWxheV9zcGVjX2N0cmw7Cj4gIGV4dGVybiB1aW50OF90IGRlZmF1bHRfeGVuX3NwZWNfY3RybDsK PiAgZXh0ZXJuIHVpbnQ4X3QgZGVmYXVsdF9zcGVjX2N0cmxfZmxhZ3M7Cj4gIAo+ICsjaWZkZWYg Q09ORklHX1BWCj4gIGV4dGVybiBpbnQ4X3Qgb3B0X3hwdGlfaHdkb20sIG9wdF94cHRpX2RvbXU7 Cj4gKyNlbHNlCj4gKyMgZGVmaW5lIG9wdF94cHRpX2h3ZG9tIGZhbHNlCj4gKyMgZGVmaW5lIG9w dF94cHRpX2RvbXUgZmFsc2UKPiArI2VuZGlmCgpUaGVzZSBub3cgaGF2ZSBtb3JlIGNvbXBsaWNh dGVkIGludGVyYWN0aW9uIHdpdGggZmx1c2hpbmcuwqAgQXQgdGhlCmFic29sdXRlIG1pbmltdW0s IGl0IG5lZWRzIGEgc2VudGVuY2Ugb3IgdHdvIGFib3V0IHRoZSBuZXcgc2VtYW50aWNzLgoKfkFu ZHJldwoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVu LWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6 Ly9saXN0cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi1kZXZlbA==