From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andre Przywara Subject: ITS emulation race conditions Date: Mon, 10 Apr 2017 00:10:34 +0100 Message-ID: <56c252be-8034-559c-471f-86f85d8c335b@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 1cxM0A-0002hY-Dh for xen-devel@lists.xenproject.org; Sun, 09 Apr 2017 23:12:10 +0000 List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Stefano Stabellini , Julien Grall Cc: xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org SGksCgpJIHdhbnRlZCB0byBydW4gc29tZSBpZGVhcyBvbiBob3cgdG8gcHJldmVudCB0aGUgcmFj ZSBjb25kaXRpb25zIHdlIGFyZQpmYWNpbmcgd2l0aCB0aGUgSVRTIGVtdWxhdGlvbiBhbmQgcmVt b3ZpbmcgZGV2aWNlcyBhbmQvb3IgTFBJcy4KSSB0aGluayBTdGVmYW5vJ3MgaWRlYSBvZiB0YWdn aW5nIGEgZGlzY2FyZGVkIExQSSBpcyB0aGUga2V5LCBidXQgc3RpbGwKc29tZSBkZXRhaWxzIGFy ZSBsZWZ0IHRvIGJlIHNvbHZlZC4KSSB0aGluayB3ZSBhcmUgZGVhbGluZyB3aXRoIHR3byBpc3N1 ZXM6CjEpIEEgZ3Vlc3QncyBESVNDQVJEIGNhbiByYWNlIHdpdGggaW4gaW5jb21pbmcgTFBJLgpJ ZGVhbGx5IERJU0NBUkQgd291bGQgcmVtb3ZlIHRoZSBob3N0IExQSSAtPiB2TFBJIGNvbm5lY3Rp b24gKGluIHRoZQpob3N0X2xwaXMgdGFibGUpLCBzbyBhbnkgbmV3IGluY29taW5nIChob3N0KSBM UEkgd291bGQgc2ltcGx5IGJlCmRpc2NhcmRlZCB2ZXJ5IGVhcmx5IGluIGdpY3YzX2RvX0xQSSgp IHdpdGhvdXQgZXZlciByZXNvbHZpbmcgaW50byBhCnZpcnR1YWwgTFBJLiBOb3cgd2hpbGUgdGhp cyByZW1vdmFsIGlzIGF0b21pYywgd2UgY291bGQgaGF2ZSBqdXN0IG1pc3NlZAphbiBpbmNvbWlu ZyBMUEksIHNvIHRoZSBvbGQgdmlydHVhbCBMUEkgd291bGQgc3RpbGwgdHJhdmVyc2UgZG93biB0 aGUKVkdJQyB3aXRoIGEgImRvb21lZCIgdmlydHVhbCBMUEkgSUQuCkkgd29uZGVyIGlmIHRoYXQg Y291bGQgYmUgc29sdmVkIGJ5IGEgImNyb3Nzd2lzZSIgY2hlY2s6Ci0gVGhlIERJU0NBUkQgaGFu ZGxlciAqZmlyc3QqIHRhZ3MgdGhlIHBlbmRpbmdfaXJxIGFzICJVTk1BUFBFRCIsICp0aGVuKgpy ZW1vdmVzIHRoZSBob3N0X2xwaXMgY29ubmVjdGluLgotIGRvX0xQSSgpIHJlYWRzIHRoZSBob3N0 X2xwaXMoKSBhcnJheSwgKnRoZW4qIGNoZWNrcyB0aGUgVU5NQVBQRUQgdGFnCmluIHRoZSBjb3Jy ZXNwb25kaW5nIHBlbmRpbmdfaXJxIChvciBsZXRzIHZnaWNfdmNwdV9pbmplY3RfaXJxKCkgZG8g dGhhdCkuCldpdGggdGhpcyBzZXR1cCB0aGUgRElTQ0FSRCBoYW5kbGVyIGNhbiBhc3N1bWUgdGhh dCBubyBuZXcgdmlydHVhbCBMUEkKaW5zdGFuY2VzIGVudGVyIHRoZSBWR0lDIGFmdGVyd2FyZHMu CgoyKSBBbiB1bm1hcHBlZCBMUEkgbWlnaHQgc3RpbGwgYmUgaW4gdXNlIGJ5IHRoZSBWR0lDLCBm b3JlbW9zdCBtaWdodApzdGlsbCBiZSBpbiBhbiBMUi4KVGFnZ2luZyB0aGUgcGVuZGluZ19pcnEg c2hvdWxkIHNvbHZlIHRoaXMgaW4gZ2VuZXJhbC4gV2hlbmV2ZXIgYSBWR0lDCmZ1bmN0aW9uIGZp bmRzIHRoZSBVTk1BUFBFRCB0YWcsIGl0IGRvZXMgbm90IHByb2Nlc3MgdGhlIHZJUlEsIGJ1dApy ZXRpcmVzIGl0LiBGb3Igc2ltcGxpY2l0eSB3ZSBtaWdodCBsaW1pdCB0aGlzIHRvIGhhbmRsaW5n IHdoZW4gYSBWQ1BVCmV4aXN0cyBhbmQgYW4gTFIgZ2V0cyBjbGVhbmVkIHVwOiBJZiB3ZSBoaXQg YSB0YWdnZWQgcGVuZGluZ19pcnEgaGVyZSwKd2UgY2xlYW4gdGhlIExSLCByZW1vdmUgdGhlIHBl bmRpbmdfaXJxIGZyb20gYWxsIGxpc3RzIGFuZCBzaWduYWwgdGhlCklUUyBlbXVsYXRpb24gdGhh dCB0aGlzIHBlbmRpbmdfaXJxIGlzIG5vdyByZWFkeSB0byBiZSByZW1vdmVkIChieQpjYWxsaW5n IHNvbWUga2luZCBvZiBjbGVhbnVwX2xwaSgpIGZ1bmN0aW9uLCBmb3IgaW5zdGFuY2UpLgpUaGUg SVRTIGNvZGUgY2FuIHRoZW4gcmVtb3ZlIHRoZSBzdHJ1Y3QgcGVuZGluZ19pcnEgZnJvbSB0aGUg cmFkaXggdHJlZS4KCk1BUEQoVj0wKSBpcyBub3cgdXNpbmcgdGhpcyB0byB0YWcgYWxsIHN0aWxs IG1hcHBlZCBldmVudHMgYXMKIlVOTUFQUEVEIiwgdGhlIGNvdW50aW5nIGRvd24gdGhlICJzdGls bCBhbGl2ZSIgcGVuZGluZ19pcnFzIGluCmNsZWFudXBfbHBpKCkgdW50aWwgdGhleSByZWFjaCB6 ZXJvLiBBdCB0aGlzIHBvaW50IGl0IHNob3VsZCBiZSBzYWZlIHRvCmZyZWUgdGhlIHBlbmRfaXJx IGFycmF5LgoKRG9lcyB0aGF0IHNvdW5kIGxpa2UgYSBwbGFuPwpEbyBJIG1pc3Mgc29tZXRoaW5n IGhlcmU/IFByb2JhYmx5IHllcywgaGVuY2UgSSBhbSBhc2tpbmcgOy0pCgpDaGVlcnMsCkFuZHJl LgpJTVBPUlRBTlQgTk9USUNFOiBUaGUgY29udGVudHMgb2YgdGhpcyBlbWFpbCBhbmQgYW55IGF0 dGFjaG1lbnRzIGFyZSBjb25maWRlbnRpYWwgYW5kIG1heSBhbHNvIGJlIHByaXZpbGVnZWQuIElm IHlvdSBhcmUgbm90IHRoZSBpbnRlbmRlZCByZWNpcGllbnQsIHBsZWFzZSBub3RpZnkgdGhlIHNl bmRlciBpbW1lZGlhdGVseSBhbmQgZG8gbm90IGRpc2Nsb3NlIHRoZSBjb250ZW50cyB0byBhbnkg b3RoZXIgcGVyc29uLCB1c2UgaXQgZm9yIGFueSBwdXJwb3NlLCBvciBzdG9yZSBvciBjb3B5IHRo ZSBpbmZvcm1hdGlvbiBpbiBhbnkgbWVkaXVtLiBUaGFuayB5b3UuCgpfX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhl bi1kZXZlbEBsaXN0cy54ZW4ub3JnCmh0dHBzOi8vbGlzdHMueGVuLm9yZy94ZW4tZGV2ZWwK