From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: Re: xen/arm and swiotlb-xen: possible data corruption Date: Thu, 2 Mar 2017 11:12:00 -0800 (PST) Message-ID: References: <20170302083837.GB23726@toto> <20170302085332.GU9606@toto> <06e91a8f-f31d-b016-afdd-c6ef28800b87@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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 1cjW90-00057V-DF for xen-devel@lists.xenproject.org; Thu, 02 Mar 2017 19:12:06 +0000 In-Reply-To: <06e91a8f-f31d-b016-afdd-c6ef28800b87@arm.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Julien Grall Cc: "Edgar E. Iglesias" , "Edgar E. Iglesias" , nd@arm.com, Stefano Stabellini , xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org T24gVGh1LCAyIE1hciAyMDE3LCBKdWxpZW4gR3JhbGwgd3JvdGU6Cj4gT24gMDIvMDMvMTcgMDg6 NTMsIEVkZ2FyIEUuIElnbGVzaWFzIHdyb3RlOgo+ID4gT24gVGh1LCBNYXIgMDIsIDIwMTcgYXQg MDk6Mzg6MzdBTSArMDEwMCwgRWRnYXIgRS4gSWdsZXNpYXMgd3JvdGU6Cj4gPiA+IE9uIFdlZCwg TWFyIDAxLCAyMDE3IGF0IDA1OjA1OjIxUE0gLTA4MDAsIFN0ZWZhbm8gU3RhYmVsbGluaSB3cm90 ZToKPiA+ID4gPiBIaSBhbGwsCj4gPiA+ID4gCj4gPiA+ID4gRWRnYXIgcmVwb3J0ZWQgYSBkYXRh IGNvcnJ1cHRpb24gb24gbmV0d29yayBwYWNrZXRzIGluIGRvbTAgd2hlbiB0aGUKPiA+ID4gPiBz d2lvdGxiLXhlbiBpcyBpbiB1c2UuIEhlIGFsc28gcmVwb3J0ZWQgdGhhdCB0aGUgZm9sbG93aW5n IHBhdGNoICJmaXhlcyIKPiA+ID4gPiB0aGUgcHJvYmxlbSBmb3IgaGltOgo+ID4gPiA+IAo+ID4g PiA+ICBzdGF0aWMgdm9pZCBfX3hlbl9kbWFfcGFnZV9jcHVfdG9fZGV2KHN0cnVjdCBkZXZpY2Ug Kmh3ZGV2LCBkbWFfYWRkcl90Cj4gPiA+ID4gaGFuZGxlLAo+ID4gPiA+ICAgICAgICAgICAgICAg ICBzaXplX3Qgc2l6ZSwgZW51bSBkbWFfZGF0YV9kaXJlY3Rpb24gZGlyKQo+ID4gPiA+ICB7Cj4g PiA+ID4gLSAgICAgICBkbWFfY2FjaGVfbWFpbnQoaGFuZGxlICYgUEFHRV9NQVNLLCBoYW5kbGUg JiB+UEFHRV9NQVNLLCBzaXplLAo+ID4gPiA+IGRpciwgRE1BX01BUCk7Cj4gPiA+ID4gKyAgICAg ICBwcmludGsoIiVzOiBhZGRyPSVseCBzaXplPSV6ZFxuIiwgX19mdW5jX18sIGhhbmRsZSwgc2l6 ZSk7Cj4gPiA+ID4gKyAgICAgICBkbWFfY2FjaGVfbWFpbnQoaGFuZGxlICYgUEFHRV9NQVNLLCBo YW5kbGUgJiB+UEFHRV9NQVNLLCBzaXplICsKPiA+ID4gPiA2NCwgZGlyLCBETUFfTUFQKTsKPiA+ ID4gPiAKPiA+ID4gPiBJIGFtIHRoaW5raW5nIHRoYXQgdGhlIHByb2JsZW0gaGFzIHNvbWV0aGlu ZyB0byBkbyB3aXRoIGNhY2hlbGluZQo+ID4gPiA+IGFsaWdubWVudCBvbiB0aGUgWGVuIHNpZGUK PiA+ID4gPiAoeGVuL2NvbW1vbi9ncmFudF90YWJsZS5jOl9fZ250dGFiX2NhY2hlX2ZsdXNoKS4K PiA+ID4gPiAKPiA+ID4gPiBJZiBvcCA9PSBHTlRUQUJfQ0FDSEVfSU5WQUwsIHdlIGNhbGwgaW52 YWxpZGF0ZV9kY2FjaGVfdmFfcmFuZ2U7IGlmIG9wCj4gPiA+ID4gPT0gR05UVEFCX0NBQ0hFX0NM RUFOLCB3ZSBjYWxsIGNsZWFuX2RjYWNoZV92YV9yYW5nZSBpbnN0ZWFkLiBUaGUKPiA+ID4gPiBw YXJhbWV0ZXIsIHYsIGNvdWxkIGJlIG5vbi1jYWNoZWxpbmUgYWxpZ25lZC4KPiA+ID4gPiAKPiA+ ID4gPiBpbnZhbGlkYXRlX2RjYWNoZV92YV9yYW5nZSBpcyBjYXBhYmxlIG9mIGhhbmRsaW5nIGEg bm90IGFsaWduZWQgYWRkcmVzcywKPiA+ID4gPiB3aGlsZSBjbGVhbl9kY2FjaGVfdmFfcmFuZ2Ug ZG9lcyBub3QuCj4gPiA+ID4gCj4gPiA+ID4gRWRnYXIsIGRvZXMgdGhlIGFwcGVuZGVkIHBhdGNo IGZpeCB0aGUgcHJvYmxlbSBmb3IgeW91Pwo+ID4gPiAKPiA+ID4gCj4gPiA+IFRoYW5rcyBTdGVm YW5vLAo+ID4gPiAKPiA+ID4gVGhpcyBkb2VzIGluZGVlZCBmaXggdGhlIGlzc3VlIGZvciBtZS4K ClRoYW5rcyBmb3IgcmVwb3J0aW5nIGFuZCB0ZXN0aW5nIQoKCj4gPiBIaSBhZ2FpbiwKPiA+IAo+ ID4gTG9va2luZyBhdCB0aGUgY29kZSwgdGhlIHByb2JsZW0gaGVyZSBpcyB0aGF0IHdlIG1heSBm bHVzaCBvbmUgY2FjaGUgbGluZQo+ID4gbGVzcyB0aGFuIGV4cGVjdGVkLgo+ID4gCj4gPiBUaGlz IHNtYWxsZXIgcGF0Y2ggZml4ZXMgaXQgZm9yIG1lIHRvbzoKPiA+IGRpZmYgLS1naXQgYS94ZW4v aW5jbHVkZS9hc20tYXJtL3BhZ2UuaCBiL3hlbi9pbmNsdWRlL2FzbS1hcm0vcGFnZS5oCj4gPiBp bmRleCBjNDkyZDZkLi5mYTFiNGRkIDEwMDY0NAo+ID4gLS0tIGEveGVuL2luY2x1ZGUvYXNtLWFy bS9wYWdlLmgKPiA+ICsrKyBiL3hlbi9pbmNsdWRlL2FzbS1hcm0vcGFnZS5oCj4gPiBAQCAtMzI1 LDcgKzMyNSw5IEBAIHN0YXRpYyBpbmxpbmUgaW50IGNsZWFuX2RjYWNoZV92YV9yYW5nZShjb25z dCB2b2lkICpwLAo+ID4gdW5zaWduZWQgbG9uZyBzaXplKQo+ID4gIHsKPiA+ICAgICAgY29uc3Qg dm9pZCAqZW5kOwo+ID4gICAgICBkc2Ioc3kpOyAgICAgICAgICAgLyogU28gdGhlIENQVSBpc3N1 ZXMgYWxsIHdyaXRlcyB0byB0aGUgcmFuZ2UgKi8KPiA+IC0gICAgZm9yICggZW5kID0gcCArIHNp emU7IHAgPCBlbmQ7IHAgKz0gY2FjaGVsaW5lX2J5dGVzICkKPiA+ICsKPiA+ICsgICAgZW5kID0g KHZvaWQgKilST1VORFVQKCh1aW50cHRyX3QpcCArIHNpemUsIGNhY2hlbGluZV9ieXRlcyk7Cj4g PiArICAgIGZvciAoIDsgcCA8IGVuZDsgcCArPSBjYWNoZWxpbmVfYnl0ZXMgKQo+ID4gICAgICAg ICAgYXNtIHZvbGF0aWxlIChfX2NsZWFuX2RjYWNoZV9vbmUoMCkgOiA6ICJyIiAocCkpOwo+ID4g ICAgICBkc2Ioc3kpOyAgICAgICAgICAgLyogU28gd2Uga25vdyB0aGUgZmx1c2hlcyBoYXBwZW4g YmVmb3JlIGNvbnRpbnVpbmcKPiA+ICovCj4gPiAgICAgIC8qIEFSTSBjYWxsZXJzIGFzc3VtZSB0 aGF0IGRjYWNoZV8qIGZ1bmN0aW9ucyBjYW5ub3QgZmFpbC4gKi8KPiA+IAo+ID4gCj4gPiBBbnl3 YXksIEknbSBPSyB3aXRoIGVpdGhlciBmaXguCj4gCj4gSSB3b3VsZCBwcmVmZXIgeW91ciB2ZXJz aW9uIGNvbXBhcmUgdG8gU3RlZmFubydzIG9uZS4KCkp1bGllbiwgZnJvbSBsb29raW5nIGF0IHRo ZSB0d28gZGlmZnMsIHRoaXMgaXMgc2ltcGxlciBhbmQgbmljZXIsIGJ1dCBpZgp5b3UgbG9vayBh dCB4ZW4vaW5jbHVkZS9hc20tYXJtL3BhZ2UuaCwgbXkgcGF0Y2ggbWFkZQpjbGVhbl9kY2FjaGVf dmFfcmFuZ2UgY29uc2lzdGVudCB3aXRoIGludmFsaWRhdGVfZGNhY2hlX3ZhX3JhbmdlLiBGb3IK Y29uc2lzdGVuY3ksIEkgd291bGQgcHJlZmVyIHRvIGRlYWwgd2l0aCB0aGUgdHdvIGZ1bmN0aW9u cyB0aGUgc2FtZSB3YXkuCkFsdGhvdWdoIGl0IGlzIG5vdCBhIHNwZWMgcmVxdWlyZW1lbnQsIEkg YWxzbyB0aGluayB0aGF0IGl0IGlzIGEgZ29vZAppZGVhIHRvIGlzc3VlIGNhY2hlIGZsdXNoZXMg ZnJvbSBjYWNoZWxpbmUgYWxpZ25lZCBhZGRyZXNzZXMsIGxpa2UKaW52YWxpZGF0ZV9kY2FjaGVf dmFfcmFuZ2UgZG9lcyBhbmQgTGludXggZG9lcywgdG8gbWFrZSBtb3JlIG9idmlvdXMKd2hhdCBp cyBnb2luZyBvbi4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fClhlbi1kZXZlbCBtYWlsaW5nIGxpc3QKWGVuLWRldmVsQGxpc3RzLnhlbi5vcmcKaHR0cHM6 Ly9saXN0cy54ZW4ub3JnL3hlbi1kZXZlbAo=