From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Edgar E. Iglesias" Subject: Re: xen/arm and swiotlb-xen: possible data corruption Date: Thu, 2 Mar 2017 23:55:15 +0100 Message-ID: <20170302225515.GG23726@toto> 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.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cjZd9-0005L6-7d for xen-devel@lists.xenproject.org; Thu, 02 Mar 2017 22:55:27 +0000 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: Stefano Stabellini Cc: "Edgar E. Iglesias" , Julien Grall , nd@arm.com, xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org T24gVGh1LCBNYXIgMDIsIDIwMTcgYXQgMDI6Mzk6NTVQTSAtMDgwMCwgU3RlZmFubyBTdGFiZWxs aW5pIHdyb3RlOgo+IE9uIFRodSwgMiBNYXIgMjAxNywgSnVsaWVuIEdyYWxsIHdyb3RlOgo+ID4g SGkgU3RlZmFubywKPiA+IAo+ID4gT24gMDIvMDMvMTcgMTk6MTIsIFN0ZWZhbm8gU3RhYmVsbGlu aSB3cm90ZToKPiA+ID4gT24gVGh1LCAyIE1hciAyMDE3LCBKdWxpZW4gR3JhbGwgd3JvdGU6Cj4g PiA+ID4gT24gMDIvMDMvMTcgMDg6NTMsIEVkZ2FyIEUuIElnbGVzaWFzIHdyb3RlOgo+ID4gPiA+ ID4gT24gVGh1LCBNYXIgMDIsIDIwMTcgYXQgMDk6Mzg6MzdBTSArMDEwMCwgRWRnYXIgRS4gSWds ZXNpYXMgd3JvdGU6Cj4gPiA+ID4gPiA+IE9uIFdlZCwgTWFyIDAxLCAyMDE3IGF0IDA1OjA1OjIx UE0gLTA4MDAsIFN0ZWZhbm8gU3RhYmVsbGluaSB3cm90ZToKPiA+ID4gSnVsaWVuLCBmcm9tIGxv b2tpbmcgYXQgdGhlIHR3byBkaWZmcywgdGhpcyBpcyBzaW1wbGVyIGFuZCBuaWNlciwgYnV0IGlm Cj4gPiA+IHlvdSBsb29rIGF0IHhlbi9pbmNsdWRlL2FzbS1hcm0vcGFnZS5oLCBteSBwYXRjaCBt YWRlCj4gPiA+IGNsZWFuX2RjYWNoZV92YV9yYW5nZSBjb25zaXN0ZW50IHdpdGggaW52YWxpZGF0 ZV9kY2FjaGVfdmFfcmFuZ2UuIEZvcgo+ID4gPiBjb25zaXN0ZW5jeSwgSSB3b3VsZCBwcmVmZXIg dG8gZGVhbCB3aXRoIHRoZSB0d28gZnVuY3Rpb25zIHRoZSBzYW1lIHdheS4KPiA+ID4gQWx0aG91 Z2ggaXQgaXMgbm90IGEgc3BlYyByZXF1aXJlbWVudCwgSSBhbHNvIHRoaW5rIHRoYXQgaXQgaXMg YSBnb29kCj4gPiA+IGlkZWEgdG8gaXNzdWUgY2FjaGUgZmx1c2hlcyBmcm9tIGNhY2hlbGluZSBh bGlnbmVkIGFkZHJlc3NlcywgbGlrZQo+ID4gPiBpbnZhbGlkYXRlX2RjYWNoZV92YV9yYW5nZSBk b2VzIGFuZCBMaW51eCBkb2VzLCB0byBtYWtlIG1vcmUgb2J2aW91cwo+ID4gPiB3aGF0IGlzIGdv aW5nIG9uLgo+ID4gCj4gPiBpbnZhbGlkX2RjYWNoZV92YV9yYW5nZSBpcyBzcGxpdCBiZWNhdXNl IHRoZSBjYWNoZSBpbnN0cnVjdGlvbiBkaWZmZXJzIGZvciB0aGUKPiA+IHN0YXJ0IGFuZCBlbmQg aWYgdW5hbGlnbmVkLiBGb3IgdGhlbSB5b3Ugd2FudCB0byB1c2UgY2xlYW4gJiBpbnZhbGlkYXRl IHJhdGhlcgo+ID4gdGhhbiBpbnZhbGlkYXRlLgo+ID4gCj4gPiBJZiB5b3UgbG9vayBhdCB0aGUg aW1wbGVtZW50YXRpb24gb2Ygb3RoZXIgY2FjaGUgaGVscGVycyBpbiBMaW51eCAoc2VlCj4gPiBk Y2FjaGVfYnlfbGluZV9vcCBpbiBhcmNoL2FybTY0L2luY2x1ZGUvYXNtL2Fzc2VtYmxlci5oKSwg dGhleSB3aWxsIG9ubHkgYWxpZ24KPiA+IHN0YXJ0ICYgZW5kLgo+IAo+IEkgZG9uJ3QgdGhpbmsg c28sIHVubGVzcyBJIGFtIHJlYWRpbmcgZGNhY2hlX2J5X2xpbmVfb3Agd3JvbmcuCj4gCj4gCj4g PiBBbHNvLCB0aGUgaW52YWxpZF9kY2FjaGVfdmFfcmFuZ2UgaXMgdXNpbmcgbW9kdWxvIHdoaWNo IEkgd291bGQgcmF0aGVyIGF2b2lkLgo+ID4gVGhlIG1vZHVsbyBpbiB0aGlzIGNhc2Ugd2lsbCBu b3QgYmUgb3B0aW1pemVkIGJ5IHRoZSBjb21waWxlciBiZWNhdXNlCj4gPiBjYWNoZWxpbmVfYnl0 ZXMgaXMgbm90IGEgY29uc3RhbnQuCj4gCj4gVGhhdCBpcyBhIGdvb2QgcG9pbnQuIFdoYXQgaWYg SSByZXBsYWNlIHRoZSBtb2R1bG8gb3Agd2l0aAo+IAo+ICAgcCAmIChjYWNoZWxpbmVfYnl0ZXMg LSAxKQo+IAo+IGluIGludmFsaWRhdGVfZGNhY2hlX3ZhX3JhbmdlLCB0aGVuIGFkZCB0aGUgc2lt aWxhciBjb2RlIHRvCj4gY2xlYW5fZGNhY2hlX3ZhX3JhbmdlIGFuZCBjbGVhbl9hbmRfaW52YWxp ZGF0ZV9kY2FjaGVfdmFfcmFuZ2U/CgoKWWVhaCwgaWYgdGhlcmUgd2FzIHNvbWUga2luZCBvZiBn ZW5lcmljIEFMSUdOIG9yIFJPVU5EX0RPV04gbWFjcm8gd2UgY291bGQgZG86CgotLS0gYS94ZW4v aW5jbHVkZS9hc20tYXJtL3BhZ2UuaAorKysgYi94ZW4vaW5jbHVkZS9hc20tYXJtL3BhZ2UuaApA QCAtMzI1LDcgKzMyNSw5IEBAIHN0YXRpYyBpbmxpbmUgaW50IGNsZWFuX2RjYWNoZV92YV9yYW5n ZShjb25zdCB2b2lkICpwLCB1bnNpZ25lZCBsb25nIHNpemUpCiB7CiAgICAgY29uc3Qgdm9pZCAq ZW5kOwogICAgIGRzYihzeSk7ICAgICAgICAgICAvKiBTbyB0aGUgQ1BVIGlzc3VlcyBhbGwgd3Jp dGVzIHRvIHRoZSByYW5nZSAqLwotICAgIGZvciAoIGVuZCA9IHAgKyBzaXplOyBwIDwgZW5kOyBw ICs9IGNhY2hlbGluZV9ieXRlcyApCisKKyAgICBwID0gKHZvaWQgKilBTElHTigodWludHB0cl90 KXAsIGNhY2hlbGluZV9ieXRlcyk7CisgICAgZW5kID0gKHZvaWQgKilST1VORFVQKCh1aW50cHRy X3QpcCArIHNpemUsIGNhY2hlbGluZV9ieXRlcyk7CisgICAgZm9yICggOyBwIDwgZW5kOyBwICs9 IGNhY2hlbGluZV9ieXRlcyApCiAgICAgICAgIGFzbSB2b2xhdGlsZSAoX19jbGVhbl9kY2FjaGVf b25lKDApIDogOiAiciIgKHApKTsKICAgICBkc2Ioc3kpOyAgICAgICAgICAgLyogU28gd2Uga25v dyB0aGUgZmx1c2hlcyBoYXBwZW4gYmVmb3JlIGNvbnRpbnVpbmcgKi8KICAgICAvKiBBUk0gY2Fs bGVycyBhc3N1bWUgdGhhdCBkY2FjaGVfKiBmdW5jdGlvbnMgY2Fubm90IGZhaWwuICovCgpJIHRo aW5rIHRoYXQgd291bGQgYWNoaWV2ZSB0aGUgc2FtZSByZXN1bHQgYXMgeW91ciBwYXRjaCBTdGVm YW5vPwoKQ2hlZXJzLApFZGdhcgoKCj4gCj4gCj4gPiBCVFcsIHlvdSB3b3VsZCBhbHNvIG5lZWQg dG8gZml4IGNsZWFuX2FuZF9pbnZhbGlkYXRlX2RjYWNoZV92YV9yYW5nZS4KPiAKPiBJJ2xsIGRv IHRoYXQsIHRoYW5rcyBmb3IgdGhlIHJlbWluZGVyLgoKX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxA bGlzdHMueGVuLm9yZwpodHRwczovL2xpc3RzLnhlbi5vcmcveGVuLWRldmVsCg==