From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jan Beulich" Subject: Re: [PATCH SpectreV1+L1TF v5 8/9] common/grant_table: block speculative out-of-bound accesses Date: Wed, 06 Feb 2019 07:52:11 -0700 Message-ID: <5C5AF49B0200007800214548@prv1-mh.provo.novell.com> References: <1548772997-32742-1-git-send-email-nmanthey@amazon.de> <1548772997-32742-9-git-send-email-nmanthey@amazon.de> <5C4ED1D402000078002119E6@prv1-mh.provo.novell.com> <9C03B9BA0200004637554D14@prv1-mh.provo.novell.com> <00FAA7AF020000F8B1E090C7@prv1-mh.provo.novell.com> <0104A7AF020000F8B1E090C7@prv1-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1grOYg-0001D6-He for xen-devel@lists.xenproject.org; Wed, 06 Feb 2019 14:52:14 +0000 In-Reply-To: <0104A7AF020000F8B1E090C7@prv1-mh.provo.novell.com> Content-Disposition: inline List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: nmanthey@amazon.de Cc: Juergen Gross , Tim Deegan , Stefano Stabellini , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Dario Faggioli , Martin Pohlack , Julien Grall , David Woodhouse , "Martin Mazein(amazein)" , xen-devel , Julian Stecklina , Bjoern Doebel List-Id: xen-devel@lists.xenproject.org Pj4+IE9uIDI5LjAxLjE5IGF0IDE1OjQzLCA8bm1hbnRoZXlAYW1hem9uLmRlPiB3cm90ZToKPiBA QCAtOTYzLDYgKzk2NSw5IEBAIG1hcF9ncmFudF9yZWYoCj4gICAgICAgICAgUElOX0ZBSUwodW5s b2NrX291dCwgR05UU1RfYmFkX2dudHJlZiwgIkJhZCByZWYgJSN4IGZvciBkJWRcbiIsCj4gICAg ICAgICAgICAgICAgICAgb3AtPnJlZiwgcmd0LT5kb21haW4tPmRvbWFpbl9pZCk7Cj4gIAo+ICsg ICAgLyogTWFrZSBzdXJlIHRoZSBhYm92ZSBjaGVjayBpcyBub3QgYnlwYXNzZWQgc3BlY3VsYXRp dmVseSAqLwo+ICsgICAgb3AtPnJlZiA9IGFycmF5X2luZGV4X25vc3BlYyhvcC0+cmVmLCBucl9n cmFudF9lbnRyaWVzKHJndCkpOwo+ICsKPiAgICAgIGFjdCA9IGFjdGl2ZV9lbnRyeV9hY3F1aXJl KHJndCwgb3AtPnJlZik7Cj4gICAgICBzaGFoID0gc2hhcmVkX2VudHJ5X2hlYWRlcihyZ3QsIG9w LT5yZWYpOwo+ICAgICAgc3RhdHVzID0gcmd0LT5ndF92ZXJzaW9uID09IDEgPyAmc2hhaC0+Zmxh Z3MgOiAmc3RhdHVzX2VudHJ5KHJndCwgb3AtPnJlZik7CgpKdXN0IEZUUiAtIHRoaXMgaXMgYSBj YXNlIHdoZXJlIHRoZSBjaGFuZ2UsIGFjY29yZGluZyB0byBwcmlvcgpkaXNjdXNzaW9uLCBpcyBw cmV0dHkgdW5saWtlbHkgdG8gaGVscCBhdCBhbGwuIFRoZSBjb21waWxlciB3aWxsIGhhdmUKYSBo YXJkIHRpbWUgcmVhbGl6aW5nIHRoYXQgaXQgY291bGQga2VlcCB0aGUgcmVzdWx0IGluIGEgcmVn aXN0ZXIgcGFzdAp0aGUgYWN0aXZlX2VudHJ5X2FjcXVpcmUoKSBpbnZvY2F0aW9uLCBhcyB0aGF0 IC0gZHVlIHRvIHRoZSBzcGluCmxvY2sgYWNxdWlyZWQgdGhlcmUgLSBhY3RzIGFzIGEgY29tcGls ZXIgYmFycmllci4gQW5kIGxvb2tpbmcgYXQKZ2VuZXJhdGVkIGNvZGUgKGdjYyA4LjIpIGNvbmZp cm1zIHRoYXQgdGhlcmUncyBhIHJlbG9hZCBmcm9tIHRoZQpzdGFjay4KCj4gQEAgLTIwMjYsNiAr MjAzMSw5IEBAIGdudHRhYl9wcmVwYXJlX2Zvcl90cmFuc2ZlcigKPiAgICAgICAgICBnb3RvIGZh aWw7Cj4gICAgICB9Cj4gIAo+ICsgICAgLyogTWFrZSBzdXJlIHRoZSBhYm92ZSBjaGVjayBpcyBu b3QgYnlwYXNzZWQgc3BlY3VsYXRpdmVseSAqLwo+ICsgICAgcmVmID0gYXJyYXlfaW5kZXhfbm9z cGVjKHJlZiwgbnJfZ3JhbnRfZW50cmllcyhyZ3QpKTsKPiArCj4gICAgICBzaGEgPSBzaGFyZWRf ZW50cnlfaGVhZGVyKHJndCwgcmVmKTsKPiAgCj4gICAgICBzY29tYm8ud29yZCA9ICoodTMyICop JnNoYS0+ZmxhZ3M7Cj4gQEAgLTIyMjMsNyArMjIzMSw4IEBAIGdudHRhYl90cmFuc2ZlcigKPiAg ICAgICAgICBva2F5ID0gZ250dGFiX3ByZXBhcmVfZm9yX3RyYW5zZmVyKGUsIGQsIGdvcC5yZWYp Owo+ICAgICAgICAgIHNwaW5fbG9jaygmZS0+cGFnZV9hbGxvY19sb2NrKTsKPiAgCj4gLSAgICAg ICAgaWYgKCB1bmxpa2VseSghb2theSkgfHwgdW5saWtlbHkoZS0+aXNfZHlpbmcpICkKPiArICAg ICAgICAvKiBNYWtlIHN1cmUgdGhpcyBjaGVjayBpcyBub3QgYnlwYXNzZWQgc3BlY3VsYXRpdmVs eSAqLwo+ICsgICAgICAgIGlmICggZXZhbHVhdGVfbm9zcGVjKHVubGlrZWx5KCFva2F5KSB8fCB1 bmxpa2VseShlLT5pc19keWluZykpICkKCkknbSBzdGlsbCBub3QgcmVhbGx5IGhhcHB5IGFib3V0 IHRoaXMuIFRoZSBjb21tZW50IGlzbid0IGhlbHBmdWwgaW4KY29ubmVjdGluZyB0aGUgdXNlIG9m IGV2YWx1YXRlX25vc3BlYygpIHRvIHRoZSBwcm9ibGVtIHNpdGUKKGluIHRoZSBlYXJsaWVyIGh1 bmssIHdoaWNoIEkndmUgbGVmdCBpbiBjb250ZXh0KSwgYW5kIEkgc3RpbGwgZG9uJ3QKdW5kZXJz dGFuZCB3aHkgdGhlIGUtPmlzX2R5aW5nIGlzIGdldHRpbmcgd3JhcHBlZCBhcyB3ZWxsLgpQbHVz IGl0IG9jY3VycyB0byBtZSBub3cgdGhhdCB5b3UncmUgbGlhYmxlIHRvIHJlbmRlciB1bmxpa2Vs eSgpCmluZWZmZWN0aXZlIGhlcmUuIFNvIGhvdyBhYm91dAoKICAgICAgICBpZiAoIHVubGlrZWx5 KGV2YWx1YXRlX25vc3BlYyghb2theSkpIHx8IHVubGlrZWx5KGUtPmlzX2R5aW5nKSApCgo/CgpK YW4KCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVu LWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6 Ly9saXN0cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL3hlbi1kZXZlbA==