From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?gbk?B?WWFuemhhbmcgTGkg?= Subject: =?gbk?q?Suggestion=3A_Improve_hypercall_Interface_to_?= =?gbk?q?get_real_return_value?= Date: Wed, 5 Dec 2012 14:21:20 +0800 (CST) Message-ID: <1141524074.6.1354688480672.JavaMail.root@bj-mail05.pku.edu.cn> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org SGVsbG8gZXZlcnlvbmUsCgpJIGFtIGEgdXNlciBvZiBYZW4gYW5kIEkgaGF2ZSBlbmNvdW50ZXJl ZCBhIHByb2JsZW0gd2hlbiB0cnlpbmcgdG8gZ2V0IHRoZSByZXR1cm4gdmFsdWUgZnJvbSBoeXBl cmNhbGwgaW4gVE9PTFMuIEkgZm91bmQgdGhhdCB3aGVuIHByb2dyYW1zIGluIFRPT0xTIGNhbGxl ZCBoeXBlcmNhbGwgYW5kIGZhaWxlZCwgaXQgd291bGQgZ2V0IHJldHVybiB2YWx1ZSAtMSBpbnN0 ZWFkIG9mIHRoZSByZWFsIHJldHVybiB2YWx1ZSBnaXZlbiBieSBIeXBlcnZpc29yLgoKVGhlIHJl YXNvbiBpcyB0aGF0IHRoZSBoeXBlcmNhbGwgaW50ZXJmYWNlIG9mIFRPT0xTIHVzZXMgaW9jdGwg dG8gY2FsbCBoeXBlcmNhbGwsIGFuZCBpb2N0bCB3aWxsIG9ubHkgcmV0dXJuIC0xIHdoZW4gZmFp bHVyZSBvY2N1cnMuIFRoZSByZWxhdGVkIGNvZGUgaXMgaW4geGVuLTQuMi4wL3Rvb2xzL2xpYnhj L3hjX2xpbnV4X29zZGVwLmM6CiAgICBzdGF0aWMgaW50IGxpbnV4X3ByaXZjbWRfaHlwZXJjYWxs KHhjX2ludGVyZmFjZSAqeGNoLCB4Y19vc2RlcF9oYW5kbGUgaCwgcHJpdmNtZF9oeXBlcmNhbGxf dCAqaHlwZXJjYWxsKQogICAgewogICAgICAgIGludCBmZCA9IChpbnQpaDsKICAgICAgICByZXR1 cm4gaW9jdGwoZmQsIElPQ1RMX1BSSVZDTURfSFlQRVJDQUxMLCBoeXBlcmNhbGwpOwogICAgfQoK V2hpbGUgSSBkb24ndCB0aGluayB0aGlzIGlzIGEgZ29vZCBpZGVhLCBiZWNhdXNlIHNvbWUgdG9v bHMgbWF5IHdpc2ggdG8gdXNlIHJlYWwgcmV0dXJuIHZhbHVlLiBGb3IgZXhhbXBsZSwgaW4geGVu LTQuMi4wL3Rvb2xzL21lbXNoci9pbnRlcmZhY2UuYywgdGhlIGZ1bmN0aW9uIG1lbXNocl92YmRf aXNzdWVfcm9fcmVxdWVzdCB3aWxsIHN3aXRjaCB2YXJpYWJsZSByZXQgd2hpY2ggY29tZXMgZnJv bSByZXR1cm4gdmFsdWUgb2YgaHlwZXJjYWxsIGRvX21lbW9yeV9vcDoKICAgIHN3aXRjaChyZXQp CiAgICB7CiAgICAgICAgY2FzZSBYRU5NRU1fU0hBUklOR19PUF9TX0hBTkRMRV9JTlZBTElEOgog ICAgICAgICAgICDigKbigKYKICAgICAgICAgICAgYnJlYWs7CiAgICAgICAgY2FzZSBYRU5NRU1f U0hBUklOR19PUF9DX0hBTkRMRV9JTlZBTElEOgogICAgICAgICAgICDigKbigKYKICAgICAgICAg ICAgYnJlYWs7CiAgICAgICAgZGVmYXVsdDoKICAgICAgICAgICAgYnJlYWs7Cn0KClNvIEkgdGhp bmsgaWYgd2UgY291bGQgbW9kaWZ5IHRoZSBpbnRlcmZhY2UgYSBsaXR0bGUgYml0IHRvIHJldHVy biB0aGUgcmVhbCBlcnJvciBudW1iZXIsIGl0IHdvdWxkIGJlIGJlbmVmaWNpYWwgdG8gbWFueSBU T09MUyBkZXZlbG9wZXJzIGluY2x1ZGluZyBteXNlbGYuIE15IHN1Z2dlc3RlZCBtb2RpZmljYXRp b24gaXMgc2ltcGxlOgogICAgc3RhdGljIGludCBsaW51eF9wcml2Y21kX2h5cGVyY2FsbCh4Y19p bnRlcmZhY2UgKnhjaCwgeGNfb3NkZXBfaGFuZGxlIGgsIHByaXZjbWRfaHlwZXJjYWxsX3QgKmh5 cGVyY2FsbCkKICAgIHsKICAgICAgICBpbnQgZmQgPSAoaW50KWg7CiAgICAgICAgaW50IHJldCA9 IGlvY3RsKGZkLCBJT0NUTF9QUklWQ01EX0hZUEVSQ0FMTCwgaHlwZXJjYWxsKTsKICAgICAgICBp ZiAocmV0IDwgMCkKICAgICAgICAgICAgcmV0dXJuIC1lcnJubzsKICAgICAgICByZXR1cm4gcmV0 OwogICAgfQoKRG8geW91IHRoaW5rIHRoaXMgd291bGQgYmUgYSBnb29kIG1vZGlmaWNhdGlvbj8g CkFsc28sIEkgYW0gY3VyaW91cyB3aHkgdGhlIG9yaWdpbmFsIGRlc2lnbiBkaWRuJ3QgZG8gdGhh dC4gSXMgaXQgYSBidWcgb3IgaXMgaXQgZGVzaWduZWQgdGhhdCB3YXkgaW50ZW50aW9uYWxseT8K QW55IHN1Z2dlc3Rpb25zIGFuZCBjb21tZW50cyB3aWxsIGJlIGhpZ2hseSBhcHByZWNpYXRlZC4K ClRoYW5rcyEKQmVzdCBSZWdhcmRzLApZYW56aGFuZyBMaQoKX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2 ZWxAbGlzdHMueGVuLm9yZwpodHRwOi8vbGlzdHMueGVuLm9yZy94ZW4tZGV2ZWwK