From mboxrd@z Thu Jan 1 00:00:00 1970 From: Borislav Petkov Subject: Re: [PATCH v4 2/5] x86/msr: Carry on after a non-"safe" MSR access fails without !panic_on_oops Date: Mon, 14 Mar 2016 13:02:03 +0100 Message-ID: <20160314120202.GD15800__13694.7861676619$1457957040$gmane$org@pd.tnic> References: Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Andy Lutomirski Cc: KVM list , Peter Zijlstra , Linus Torvalds , X86 ML , "linux-kernel@vger.kernel.org" , xen-devel , Paolo Bonzini , Andrew Morton , Arjan van de Ven List-Id: xen-devel@lists.xenproject.org T24gU2F0LCBNYXIgMTIsIDIwMTYgYXQgMTA6MDg6NDlBTSAtMDgwMCwgQW5keSBMdXRvbWlyc2tp IHdyb3RlOgo+IFRoaXMgZGVtb3RlcyBhbiBPT1BTIGFuZCBsaWtlbHkgcGFuaWMgZHVlIHRvIGEg ZmFpbGVkIG5vbi0ic2FmZSIgTVNSCj4gYWNjZXNzIHRvIGEgV0FSTl9PTkNFIGFuZCwgZm9yIFJE TVNSLCBhIHJldHVybiB2YWx1ZSBvZiB6ZXJvLiAgSWYKPiBwYW5pY19vbl9vb3BzIGlzIHNldCwg dGhlbiBmYWlsZWQgdW5zYWZlIE1TUiBhY2Nlc3NlcyB3aWxsIHN0aWxsCj4gb29wcyBhbmQgcGFu aWMuCj4gCj4gVG8gYmUgY2xlYXIsIHRoaXMgdHlwZSBvZiBmYWlsdXJlIHNob3VsZCAqbm90KiBo YXBwZW4uICBUaGlzIHBhdGNoCj4gZXhpc3RzIHRvIG1pbmltaXplIHRoZSBjaGFuY2Ugb2YgbmFz dHkgdW5kZWJ1Z2dhYmxlIGZhaWx1cmVzIGR1ZSBvbgo+IHN5c3RlbXMgdGhhdCB1c2VkIHRvIHdv cmsgZHVlIHRvIGEgbm93LWZpeGVkIENPTkZJR19QQVJBVklSVD15IGJ1Zy4KPiAKPiBTaWduZWQt b2ZmLWJ5OiBBbmR5IEx1dG9taXJza2kgPGx1dG9Aa2VybmVsLm9yZz4KPiAtLS0KPiAgYXJjaC94 ODYvaW5jbHVkZS9hc20vbXNyLmggfCAxMCArKysrKysrKy0tCj4gIGFyY2gveDg2L21tL2V4dGFi bGUuYyAgICAgIHwgMzMgKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrCj4gIDIgZmls ZXMgY2hhbmdlZCwgNDEgaW5zZXJ0aW9ucygrKSwgMiBkZWxldGlvbnMoLSkKPiAKPiBkaWZmIC0t Z2l0IGEvYXJjaC94ODYvaW5jbHVkZS9hc20vbXNyLmggYi9hcmNoL3g4Ni9pbmNsdWRlL2FzbS9t c3IuaAo+IGluZGV4IDkzZmI3YzFjZmZkYS4uMTQ4NzA1NGExYTcwIDEwMDY0NAo+IC0tLSBhL2Fy Y2gveDg2L2luY2x1ZGUvYXNtL21zci5oCj4gKysrIGIvYXJjaC94ODYvaW5jbHVkZS9hc20vbXNy LmgKPiBAQCAtOTIsNyArOTIsMTAgQEAgc3RhdGljIGlubGluZSB1bnNpZ25lZCBsb25nIGxvbmcg bmF0aXZlX3JlYWRfbXNyKHVuc2lnbmVkIGludCBtc3IpCj4gIHsKPiAgCURFQ0xBUkVfQVJHUyh2 YWwsIGxvdywgaGlnaCk7Cj4gIAo+IC0JYXNtIHZvbGF0aWxlKCJyZG1zciIgOiBFQVhfRURYX1JF VCh2YWwsIGxvdywgaGlnaCkgOiAiYyIgKG1zcikpOwo+ICsJYXNtIHZvbGF0aWxlKCIxOiByZG1z clxuIgo+ICsJCSAgICAgIjI6XG4iCj4gKwkJICAgICBfQVNNX0VYVEFCTEVfSEFORExFKDFiLCAy YiwgZXhfaGFuZGxlcl9yZG1zcl91bnNhZmUpCj4gKwkJICAgICA6IEVBWF9FRFhfUkVUKHZhbCwg bG93LCBoaWdoKSA6ICJjIiAobXNyKSk7Cj4gIAlpZiAobXNyX3RyYWNlcG9pbnRfYWN0aXZlKF9f dHJhY2Vwb2ludF9yZWFkX21zcikpCj4gIAkJZG9fdHJhY2VfcmVhZF9tc3IobXNyLCBFQVhfRURY X1ZBTCh2YWwsIGxvdywgaGlnaCksIDApOwo+ICAJcmV0dXJuIEVBWF9FRFhfVkFMKHZhbCwgbG93 LCBoaWdoKTsKPiBAQCAtMTE5LDcgKzEyMiwxMCBAQCBzdGF0aWMgaW5saW5lIHVuc2lnbmVkIGxv bmcgbG9uZyBuYXRpdmVfcmVhZF9tc3Jfc2FmZSh1bnNpZ25lZCBpbnQgbXNyLAo+ICBzdGF0aWMg aW5saW5lIHZvaWQgbmF0aXZlX3dyaXRlX21zcih1bnNpZ25lZCBpbnQgbXNyLAo+ICAJCQkJICAg IHVuc2lnbmVkIGxvdywgdW5zaWduZWQgaGlnaCkKPiAgewo+IC0JYXNtIHZvbGF0aWxlKCJ3cm1z ciIgOiA6ICJjIiAobXNyKSwgImEiKGxvdyksICJkIiAoaGlnaCkgOiAibWVtb3J5Iik7Cj4gKwlh c20gdm9sYXRpbGUoIjE6IHdybXNyXG4iCj4gKwkJICAgICAiMjpcbiIKPiArCQkgICAgIF9BU01f RVhUQUJMRV9IQU5ETEUoMWIsIDJiLCBleF9oYW5kbGVyX3dybXNyX3Vuc2FmZSkKClRoaXMgbWln aHQgYmUgYSBnb29kIGlkZWE6CgpbICAgIDAuMjIwMDY2XSBjcHVpZGxlOiB1c2luZyBnb3Zlcm5v ciBtZW51ClsgICAgMC4yMjQwMDBdIC0tLS0tLS0tLS0tLVsgY3V0IGhlcmUgXS0tLS0tLS0tLS0t LQpbICAgIDAuMjI0MDAwXSBXQVJOSU5HOiBDUFU6IDAgUElEOiAxIGF0IGFyY2gveDg2L21tL2V4 dGFibGUuYzo3NCBleF9oYW5kbGVyX3dybXNyX3Vuc2FmZSsweDczLzB4ODAoKQpbICAgIDAuMjI0 MDAwXSB1bmNoZWNrZWQgTVNSIGFjY2VzcyBlcnJvcjogV1JNU1IgdG8gMHhkZWFkYmVlZiAodHJp ZWQgdG8gd3JpdGUgMHgwMDAwMDAwMDAwMDBjYWNhKQpbICAgIDAuMjI0MDAwXSBNb2R1bGVzIGxp bmtlZCBpbjoKWyAgICAwLjIyNDAwMF0gQ1BVOiAwIFBJRDogMSBDb21tOiBzd2FwcGVyLzAgTm90 IHRhaW50ZWQgNC41LjAtcmM3KyAjNwpbICAgIDAuMjI0MDAwXSBIYXJkd2FyZSBuYW1lOiBRRU1V IFN0YW5kYXJkIFBDIChpNDQwRlggKyBQSUlYLCAxOTk2KSwgQklPUyAxLjcuNS0yMDE0MDUzMV8w ODMwMzAtZ2FuZGFsZiAwNC8wMS8yMDE0ClsgICAgMC4yMjQwMDBdICAwMDAwMDAwMDAwMDAwMDAw IGZmZmY4ODAwN2MwZDdjMDggZmZmZmZmZmY4MTJmMTNhMyBmZmZmODgwMDdjMGQ3YzUwClsgICAg MC4yMjQwMDBdICBmZmZmZmZmZjgxYTQwZmZlIGZmZmY4ODAwN2MwZDdjNDAgZmZmZmZmZmY4MTA1 YzNiMSBmZmZmZmZmZjgxNzE3NzEwClsgICAgMC4yMjQwMDBdICBmZmZmODgwMDdjMGQ3ZDE4IDAw MDAwMDAwMDAwMDAwMDAgZmZmZmZmZmY4MTYyMDdkMCAwMDAwMDAwMDAwMDAwMDAwClsgICAgMC4y MjQwMDBdIENhbGwgVHJhY2U6ClsgICAgMC4yMjQwMDBdICBbPGZmZmZmZmZmODEyZjEzYTM+XSBk dW1wX3N0YWNrKzB4NjcvMHg5NApbICAgIDAuMjI0MDAwXSAgWzxmZmZmZmZmZjgxMDVjM2IxPl0g d2Fybl9zbG93cGF0aF9jb21tb24rMHg5MS8weGQwClsgICAgMC4yMjQwMDBdICBbPGZmZmZmZmZm ODE2MjA3ZDA+XSA/IGFtZF9jcHVfbm90aWZ5KzB4NDAvMHg0MApbICAgIDAuMjI0MDAwXSAgWzxm ZmZmZmZmZjgxMDVjNDNjPl0gd2Fybl9zbG93cGF0aF9mbXQrMHg0Yy8weDUwClsgICAgMC4yMjQw MDBdICBbPGZmZmZmZmZmODE2MjA3ZDA+XSA/IGFtZF9jcHVfbm90aWZ5KzB4NDAvMHg0MApbICAg IDAuMjI0MDAwXSAgWzxmZmZmZmZmZjgxMzFkZTUzPl0gPyBfX3RoaXNfY3B1X3ByZWVtcHRfY2hl Y2srMHgxMy8weDIwClsgICAgMC4yMjQwMDBdICBbPGZmZmZmZmZmODEwNGVmZTM+XSBleF9oYW5k bGVyX3dybXNyX3Vuc2FmZSsweDczLzB4ODAKCmFuZCBpdCBsb29rcyBoZWxwZnVsIGFuZCBhbGwg YnV0IHdoZW4geW91IGRvIGl0IHByZXR0eSBlYXJseSAtIGZvcgpleGFtcGxlIEkgYWRkZWQgYQoK CSB3cm1zcmwoMHhkZWFkYmVlZiwgMHhjYWZlKTsKCmF0IHRoZSBlbmQgb2YgcGF0X2JzcF9pbml0 KCkgYW5kIHRoZSBtYWNoaW5lIGV4cGxvZGVzIHdpdGggYW4gZWFybHkKcGFuaWMuIEknbSB3b25k ZXJpbmcgd2hhdCBpcyBiZXR0ZXIgLSBlYXJseSBwYW5pYyBvciBhbiBlYXJseSAjR1AgZnJvbSBh Cm1pc3NpbmcgTVNSLgoKQW5kIG1vcmUgc3BlY2lmaWNhbGx5LCBjYW4gd2UgZG8gYmV0dGVyIHRv IGhhbmRsZSB0aGUgZWFybHkgY2FzZQpncmFjZWZ1bGx5IHRvbz8KCi0tIApSZWdhcmRzL0dydXNz LAogICAgQm9yaXMuCgpFQ08gdGlwICMxMDE6IFRyaW0geW91ciBtYWlscyB3aGVuIHlvdSByZXBs eS4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1k ZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxpc3RzLnhlbi5vcmcKaHR0cDovL2xpc3RzLnhl bi5vcmcveGVuLWRldmVsCg==