From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Cooper Subject: Re: Issues with the xen-access.c model Date: Tue, 5 Apr 2016 13:13:39 +0100 Message-ID: <5703ABF3.4040709@citrix.com> References: <570399A2.4090507@bitdefender.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <570399A2.4090507@bitdefender.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Razvan Cojocaru , "xen-devel@lists.xen.org" Cc: Tamas K Lengyel List-Id: xen-devel@lists.xenproject.org T24gMDUvMDQvMTYgMTE6NTUsIFJhenZhbiBDb2pvY2FydSB3cm90ZToKPiBIZWxsbywKPgo+IHhl bi1hY2Nlc3MuYyBkb2VzIHJvdWdobHkgdGhpczoKPgo+IGZvciAoOzspIHsKPiAJcG9sbF9ldnRf Y2hhbm5lbCgpOwo+Cj4gCWlmIChuZXdfZXZlbnRzKSB7Cj4gCQl3aGlsZSAocmluZ19idWZmZXJf aGFzX3JlcXVlc3RzKSB7Cj4gCQkJcHVsbF9yZXF1ZXN0KCk7Cj4gCQkJcHJvY2Vzc19yZXF1ZXN0 KCk7Cj4gCQkJcHV0X3Jlc3BvbnNlKCk7Cj4gCQl9Cj4KPiAJCXNpZ25hbF9ldnRfY2hhbm5lbCgp Owo+IAl9Cj4gfQo+Cj4gVGhlIHByb2JsZW1zIGFyZSB0aGVzZToKPgo+IDEuIHZtX2V2ZW50X3B1 dF9yZXF1ZXN0KCkgZG9lcyBub3RpZnlfdmlhX3hlbl9ldmVudF9jaGFubmVsKGQsCj4gdmVkLT54 ZW5fcG9ydCk7IGF0IHRoZSB2ZXJ5IGVuZCwgYW5kIHdlIHNlZW0gdG8gYmUgdXNpbmcgYSBGSUZP IGV2ZW50Cj4gY2hhbm5lbCAoaWYgSSdtIHJlYWRpbmcgdGhlIGNvZGUgcmlnaHQsIGl0J3MgZ2Vu ZXJpYyBldmVudCBjaGFubmVsIGNvZGUKPiB0aGF0IHByZS1kYXRlcyB0aGUgdm1fZXZlbnQgY29k ZSB0aGF0IHNpdHMgb24gdG9wIG9mIGl0KS4KPgo+IFRoaXMgbWVhbnMgdGhhdCBmb3IgYSBndWVz dCB0aGF0J3MgcnVubmluZyB0d28gVkNQVXMsIHRoZSBmb2xsb3dpbmcKPiBzY2VuYXJpbyBpcyBw b3NzaWJsZToKPgo+ICogVkNQVTEgcHV0cyBhbiBldmVudCBpbiB0aGUgcmluZyBidWZmZXIKPiAq IFZDUFUxIHNpZ25hbHMgdGhlIGV2ZW50IGNoYW5uZWwKPiAqIHBvbGxfZXZ0X2NoYW5uZWwoKSB3 YWtlcyB1cAo+ICogVkNQVTIgcHV0cyBhbiBldmVudCBpbiB0aGUgcmluZyBidWZmZXIKPiAqIHRo ZSBsb29wIHByb2Nlc3NlcyB0aGUgZmlyc3QgZXZlbnQKPiAqIFZDUFUyIHNpZ25hbHMgdGhlIGV2 ZW50IGNoYW5uZWwKPiAqIHRoZSBsb29wIHByb2Nlc3NlcyB0aGUgc2Vjb25kIGV2ZW50IChzaW5j ZSB0aGVyZSBfYXJlXyBtb3JlIHJlcXVlc3RzCj4gaW4gdGhlIHJpbmcgYnVmZmVyKQo+ICogdGhl IGxvb3Agc2lnbmFscyB0aGUgZXZlbnQgY2hhbm5lbCB0aGF0IHJlcXVlc3RzIGhhdmUgYmVlbiBw cm9jZXNzZWQKPiAqIHBvbGxfZXZ0X2NoYW5uZWwoKSB3YWtlcyB1cCBhZ2FpbiwgYmVjYXVzZSBv ZiB0aGUgc2Vjb25kIGV2ZW50IGNoYW5uZWwKPiBzaWduYWwsIGJ1dCB0aGlzIGlzIHBvaW50bGVz cyBzaW5jZSBhbGwgZXZlbnRzIGhhdmUgYWxyZWFkeSBiZWVuIHByb2Nlc3NlZAo+Cj4gVGhpcyBj YW4gYmUgYXZvaWRlZCBieSBjb3VudGluZyB0aGUgcmVxdWVzdHMgcHJvY2Vzc2VkIHZzLiB0aGUg bnVtYmVyIG9mCj4gc3VjY2VzZnVsIHBvbGwoKXMsIGJ1dCBpdCBzdGlsbCBkb2VzIG5vdCBzb2x2 ZSB0aGUgc2Vjb25kIHByb2JsZW06Cj4KPiAyLiBSYWNlIGNvbmRpdGlvbnMuIEF0IGxlYXN0IGlu IHRoZW9yeSwgdGhlcmUncyBub3RoaW5nIHRvIHN0b3AgdGhlCj4gc2Vjb25kIGl0ZXJhdGlvbiBv ZiB0aGUgcmVxdWVzdCBwcm9jZXNzaW5nIGxvb3AgdG8gcmVhZCBhIHBhcnRpYWxseQo+IHdyaXR0 ZW4gcmVxdWVzdCBmcm9tIHRoZSByaW5nIGJ1ZmZlciwgb3IgZ2FyYmFnZSBsZWZ0IG92ZXIgZnJv bSBhCj4gcHJldmlvdXMgcmVxdWVzdCwgaWYgaXQgaGl0cyBpdCAianVzdCByaWdodCIgKGkuZS4g dGhlICJWQ1BVMiBwdXRzIGFuCj4gZXZlbnQgaW4gdGhlIHJpbmcgYnVmZmVyIiBwYXJ0IGNhbiBy dW4gb24gdG9wIG9mIHRoZSAidGhlIGxvb3AgcHJvY2Vzc2VzCj4gdGhlIHNlY29uZCBldmVudCIp Lgo+Cj4gQWxsIHRoaXMgZG9lc24ndCByZWFsbHkgc2hvdyB1cCB1bmxlc3Mgd2UncmUgaW4gaGVh dnkgcHJvY2Vzc2luZwo+IHNjZW5hcmlvcywgYnV0IHRoZXkgY2FuIG9jY3VyLCBlc3BlY2lhbGx5 IGluIHN5bmNlZCB2bV9ldmVudCBzY2VuYXJpb3MuCj4KPiBUaGUgcHJvYmxlbXMgc2VlbXMgdG8g YmUgYWxsZXZpYXRlZCBieSBjaGFuZ2luZyB0aGUgbG9vcCB0byB0aGlzOgo+Cj4gZm9yICg7Oykg ewo+IAlwb2xsX2V2dF9jaGFubmVsKCk7Cj4KPiAJaWYgKG5ld19ldmVudHMpIHsKPiAJCXdoaWxl IChyaW5nX2J1ZmZlcl9oYXNfcmVxdWVzdHMpIHsKPiAJCQlwdWxsX3JlcXVlc3QoKTsKPiAJCQlw cm9jZXNzX3JlcXVlc3QoKTsKPiAJCQlwdXRfcmVzcG9uc2UoKTsKPgo+IAkJCS8qIE1vdmVkIGhl cmUuICovCj4gCQkJc2lnbmFsX2V2dF9jaGFubmVsKCk7Cj4gCQl9Cj4gCX0KPiB9Cj4KPiBidXQg aXQncyBvYnZpb3VzbHkgbm90IGZvb2xwcm9vZiwgdGhlIG1haW4gcHJvYmxlbSByZW1haW5pbmcg dGhlCj4gc3luY2hyb25pemF0aW9uIG9mIHRoZSByaW5nIGJ1ZmZlciBmcm9tIGJvdGggdGhlIGh5 cGVydmlzb3Igc2lkZSBhbmQKPiB1c2Vyc3BhY2UuCj4KPiBIb3cgc2hvdWxkIHdlIHByb2NlZWQg dG8gZml4IHRoaXM/CgpUaGUgdm1fZXZlbnQgY29kZSBpbiBYZW4gbXVzdCBpbmNyZW1lbnQgdGhl IHByb2R1Y2VyIGluZGV4IGFzIHRoZSBmaW5hbAphY3Rpb24gb2YgcHV0dGluZyBhIHJlcXVlc3Qg b24gdGhlIHJpbmcuICBJZiBpdCBkb2Vzbid0IHRoZW4gaXQgaXMKc2ltcGx5IGJyb2tlbiBhbmQg bmVlZHMgZml4aW5nLgoKVGhpcyB3aWxsIGVuc3VyZSB0aGF0IHRoZSBjb25zdW1lciBuZXZlciBz ZWVzIGEgcGFydGlhbCByZXF1ZXN0IG9uIHRoZQpyaW5nOyBieSB0aGUgdGltZSBpdCBvYnNlcnZl cyBhIG5ld2VyIHByb2R1Y2VyIGluZGV4LCBhbGwgZGF0YSBpcwphbHJlYWR5IHdyaXR0ZW4uCgp+ QW5kcmV3CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpY ZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW4ub3JnCmh0dHA6Ly9saXN0 cy54ZW4ub3JnL3hlbi1kZXZlbAo=