From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Grall Subject: Re: xen/arm and swiotlb-xen: possible data corruption Date: Thu, 2 Mar 2017 23:24:00 +0000 Message-ID: References: <20170302083837.GB23726@toto> <20170302085332.GU9606@toto> <06e91a8f-f31d-b016-afdd-c6ef28800b87@arm.com> <20170302225515.GG23726@toto> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cja4u-0007jn-OG for xen-devel@lists.xenproject.org; Thu, 02 Mar 2017 23:24:08 +0000 In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Stefano Stabellini , "Edgar E. Iglesias" Cc: "Edgar E. Iglesias" , nd@arm.com, xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org CgpPbiAwMi8wMy8yMDE3IDIzOjA3LCBTdGVmYW5vIFN0YWJlbGxpbmkgd3JvdGU6Cj4gT24gVGh1 LCAyIE1hciAyMDE3LCBFZGdhciBFLiBJZ2xlc2lhcyB3cm90ZToKPj4gT24gVGh1LCBNYXIgMDIs IDIwMTcgYXQgMDI6Mzk6NTVQTSAtMDgwMCwgU3RlZmFubyBTdGFiZWxsaW5pIHdyb3RlOgo+Pj4g T24gVGh1LCAyIE1hciAyMDE3LCBKdWxpZW4gR3JhbGwgd3JvdGU6Cj4+Pj4gSGkgU3RlZmFubywK Pj4+Pgo+Pj4+IE9uIDAyLzAzLzE3IDE5OjEyLCBTdGVmYW5vIFN0YWJlbGxpbmkgd3JvdGU6Cj4+ Pj4+IE9uIFRodSwgMiBNYXIgMjAxNywgSnVsaWVuIEdyYWxsIHdyb3RlOgo+Pj4+Pj4gT24gMDIv MDMvMTcgMDg6NTMsIEVkZ2FyIEUuIElnbGVzaWFzIHdyb3RlOgo+Pj4+Pj4+IE9uIFRodSwgTWFy IDAyLCAyMDE3IGF0IDA5OjM4OjM3QU0gKzAxMDAsIEVkZ2FyIEUuIElnbGVzaWFzIHdyb3RlOgo+ Pj4+Pj4+PiBPbiBXZWQsIE1hciAwMSwgMjAxNyBhdCAwNTowNToyMVBNIC0wODAwLCBTdGVmYW5v IFN0YWJlbGxpbmkgd3JvdGU6Cj4+Pj4+IEp1bGllbiwgZnJvbSBsb29raW5nIGF0IHRoZSB0d28g ZGlmZnMsIHRoaXMgaXMgc2ltcGxlciBhbmQgbmljZXIsIGJ1dCBpZgo+Pj4+PiB5b3UgbG9vayBh dCB4ZW4vaW5jbHVkZS9hc20tYXJtL3BhZ2UuaCwgbXkgcGF0Y2ggbWFkZQo+Pj4+PiBjbGVhbl9k Y2FjaGVfdmFfcmFuZ2UgY29uc2lzdGVudCB3aXRoIGludmFsaWRhdGVfZGNhY2hlX3ZhX3Jhbmdl LiBGb3IKPj4+Pj4gY29uc2lzdGVuY3ksIEkgd291bGQgcHJlZmVyIHRvIGRlYWwgd2l0aCB0aGUg dHdvIGZ1bmN0aW9ucyB0aGUgc2FtZSB3YXkuCj4+Pj4+IEFsdGhvdWdoIGl0IGlzIG5vdCBhIHNw ZWMgcmVxdWlyZW1lbnQsIEkgYWxzbyB0aGluayB0aGF0IGl0IGlzIGEgZ29vZAo+Pj4+PiBpZGVh IHRvIGlzc3VlIGNhY2hlIGZsdXNoZXMgZnJvbSBjYWNoZWxpbmUgYWxpZ25lZCBhZGRyZXNzZXMs IGxpa2UKPj4+Pj4gaW52YWxpZGF0ZV9kY2FjaGVfdmFfcmFuZ2UgZG9lcyBhbmQgTGludXggZG9l cywgdG8gbWFrZSBtb3JlIG9idmlvdXMKPj4+Pj4gd2hhdCBpcyBnb2luZyBvbi4KPj4+Pgo+Pj4+ IGludmFsaWRfZGNhY2hlX3ZhX3JhbmdlIGlzIHNwbGl0IGJlY2F1c2UgdGhlIGNhY2hlIGluc3Ry dWN0aW9uIGRpZmZlcnMgZm9yIHRoZQo+Pj4+IHN0YXJ0IGFuZCBlbmQgaWYgdW5hbGlnbmVkLiBG b3IgdGhlbSB5b3Ugd2FudCB0byB1c2UgY2xlYW4gJiBpbnZhbGlkYXRlIHJhdGhlcgo+Pj4+IHRo YW4gaW52YWxpZGF0ZS4KPj4+Pgo+Pj4+IElmIHlvdSBsb29rIGF0IHRoZSBpbXBsZW1lbnRhdGlv biBvZiBvdGhlciBjYWNoZSBoZWxwZXJzIGluIExpbnV4IChzZWUKPj4+PiBkY2FjaGVfYnlfbGlu ZV9vcCBpbiBhcmNoL2FybTY0L2luY2x1ZGUvYXNtL2Fzc2VtYmxlci5oKSwgdGhleSB3aWxsIG9u bHkgYWxpZ24KPj4+PiBzdGFydCAmIGVuZC4KPj4+Cj4+PiBJIGRvbid0IHRoaW5rIHNvLCB1bmxl c3MgSSBhbSByZWFkaW5nIGRjYWNoZV9ieV9saW5lX29wIHdyb25nLgo+Pj4KPj4+Cj4+Pj4gQWxz bywgdGhlIGludmFsaWRfZGNhY2hlX3ZhX3JhbmdlIGlzIHVzaW5nIG1vZHVsbyB3aGljaCBJIHdv dWxkIHJhdGhlciBhdm9pZC4KPj4+PiBUaGUgbW9kdWxvIGluIHRoaXMgY2FzZSB3aWxsIG5vdCBi ZSBvcHRpbWl6ZWQgYnkgdGhlIGNvbXBpbGVyIGJlY2F1c2UKPj4+PiBjYWNoZWxpbmVfYnl0ZXMg aXMgbm90IGEgY29uc3RhbnQuCj4+Pgo+Pj4gVGhhdCBpcyBhIGdvb2QgcG9pbnQuIFdoYXQgaWYg SSByZXBsYWNlIHRoZSBtb2R1bG8gb3Agd2l0aAo+Pj4KPj4+ICAgcCAmIChjYWNoZWxpbmVfYnl0 ZXMgLSAxKQo+Pj4KPj4+IGluIGludmFsaWRhdGVfZGNhY2hlX3ZhX3JhbmdlLCB0aGVuIGFkZCB0 aGUgc2ltaWxhciBjb2RlIHRvCj4+PiBjbGVhbl9kY2FjaGVfdmFfcmFuZ2UgYW5kIGNsZWFuX2Fu ZF9pbnZhbGlkYXRlX2RjYWNoZV92YV9yYW5nZT8KPj4KPj4KPj4gWWVhaCwgaWYgdGhlcmUgd2Fz IHNvbWUga2luZCBvZiBnZW5lcmljIEFMSUdOIG9yIFJPVU5EX0RPV04gbWFjcm8gd2UgY291bGQg ZG86Cj4+Cj4+IC0tLSBhL3hlbi9pbmNsdWRlL2FzbS1hcm0vcGFnZS5oCj4+ICsrKyBiL3hlbi9p bmNsdWRlL2FzbS1hcm0vcGFnZS5oCj4+IEBAIC0zMjUsNyArMzI1LDkgQEAgc3RhdGljIGlubGlu ZSBpbnQgY2xlYW5fZGNhY2hlX3ZhX3JhbmdlKGNvbnN0IHZvaWQgKnAsIHVuc2lnbmVkIGxvbmcg c2l6ZSkKPj4gIHsKPj4gICAgICBjb25zdCB2b2lkICplbmQ7Cj4+ICAgICAgZHNiKHN5KTsgICAg ICAgICAgIC8qIFNvIHRoZSBDUFUgaXNzdWVzIGFsbCB3cml0ZXMgdG8gdGhlIHJhbmdlICovCj4+ IC0gICAgZm9yICggZW5kID0gcCArIHNpemU7IHAgPCBlbmQ7IHAgKz0gY2FjaGVsaW5lX2J5dGVz ICkKPj4gKwo+PiArICAgIHAgPSAodm9pZCAqKUFMSUdOKCh1aW50cHRyX3QpcCwgY2FjaGVsaW5l X2J5dGVzKTsKPj4gKyAgICBlbmQgPSAodm9pZCAqKVJPVU5EVVAoKHVpbnRwdHJfdClwICsgc2l6 ZSwgY2FjaGVsaW5lX2J5dGVzKTsKPgo+IEV2ZW4gc2ltcGxlcjoKPgo+ICAgIGVuZCA9IHAgKyBz aXplOwo+ICAgIHAgPSAodm9pZCAqKUFMSUdOKCh1aW50cHRyX3QpcCwgY2FjaGVsaW5lX2J5dGVz KTsKCldlIGRvbid0IGhhdmUgYW55IEFMSUdOIG1hY3JvIGluIFhlbiBhbmQgdGhlIHdheSB3ZSB1 c2UgdGhlIHRlcm0gYWxpZ24gCmluIHhlbiBpcyB2ZXJ5IHNpbWlsYXIgdG8gUk9VTkRVUC4KCkhv d2V2ZXIgYSBzaW1wbGUgcCA9ICh2b2lkICopKCh1aW50cHRyX3QpcCAmIH4oY2FjaGVsaW5lX2J5 dGVzIC0gMSkpIApzaG91bGQgd29yayBoZXJlLgoKQ2hlZXJzLAoKLS0gCkp1bGllbiBHcmFsbAoK X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVs IG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVuLm9yZwpodHRwczovL2xpc3RzLnhlbi5v cmcveGVuLWRldmVsCg==