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[54.240.197.233]) by smtp.gmail.com with ESMTPSA id x16sm2352385wmk.35.2020.01.09.02.28.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jan 2020 02:28:58 -0800 (PST) To: Tamas K Lengyel , xen-devel@lists.xenproject.org References: From: Julien Grall Message-ID: <5084334f-7ed6-6095-e31a-d530454357a4@xen.org> Date: Thu, 9 Jan 2020 10:28:57 +0000 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB Subject: Re: [Xen-devel] [PATCH v4 15/18] xen/mem_sharing: VM forking X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Tamas K Lengyel , Jan Beulich , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" SGkgVGFtYXMsCgpPbiAwOC8wMS8yMDIwIDE3OjE0LCBUYW1hcyBLIExlbmd5ZWwgd3JvdGU6Cj4g K3N0YXRpYyBpbnQgbWVtX3NoYXJpbmdfZm9yayhzdHJ1Y3QgZG9tYWluICpkLCBzdHJ1Y3QgZG9t YWluICpjZCkKPiArewo+ICsgICAgaW50IHJjOwo+ICsKPiArICAgIGlmICggIWQtPmNvbnRyb2xs ZXJfcGF1c2VfY291bnQgJiYKPiArICAgICAgICAgKHJjID0gZG9tYWluX3BhdXNlX2J5X3N5c3Rl bWNvbnRyb2xsZXIoZCkpICkKCkFGQUlVLCB0aGUgcGFyZW50IGRvbWFpbiB3aWxsIGJlIHBhdXNl ZCBpZiBpdCB3YXNuJ3QgcGF1c2VkIGJlZm9yZSBhbmQgCnRoaXMgd2lsbCBub3QgYmUgdW5wYXVz ZWQgYnkgdGhlIHNhbWUgaHlwZXJjYWxsLiBSaWdodD8KCklmIHNvLCB0aGlzIGJyaW5ncyB0d28g cXVlc3Rpb25zOgogICAgIC0gV2hhdCB3b3VsZCBoYXBwZW4gaWYgdGhlIHRvb2xzdGFjayBkZWNp ZGUgdG8gdW5wYXVzZSB0aGUgZG9tYWluPwogICAgIC0gSG93IGRvZXMgdGhlIGNhbGxlciBrbm93 cyB3aGV0aGVyIHRoaXMgd2FzIHBhdXNlZCBieSB0aGUgCmh5cGVyY2FsbCBvciBub3Q/CgpJIHdv dWxkIGFsc28gc3VnZ2VzdCB0byBkb2N1bWVudCB0aGUgYmVoYXZpb3Igb2YgdGhlIGh5cGVyY2Fs bCBhcyB0aGlzIAppcyBub3QgZW50aXJlbHkgb2J2aW91cyB0aGF0IHRoZSBkb21haW4gd2lsbCBi ZSBwYXVzZWQgaGVyZS4KCj4gKyAgICAgICAgcmV0dXJuIHJjOwo+ICsKPiArICAgIGNkLT5tYXhf cGFnZXMgPSBkLT5tYXhfcGFnZXM7Cj4gKyAgICBjZC0+bWF4X3ZjcHVzID0gZC0+bWF4X3ZjcHVz Owo+ICsKPiArICAgIC8qIHRoaXMgaXMgcHJlZW1wdGlibGUgc28gaXQncyB0aGUgZmlyc3QgdG8g Z2V0IGRvbmUgKi8KPiArICAgIGlmICggKHJjID0gZm9ya19oYXBfYWxsb2NhdGlvbihkLCBjZCkp ICkKPiArICAgICAgICByZXR1cm4gcmM7Cj4gKwo+ICsgICAgaWYgKCAocmMgPSBicmluZ191cF92 Y3B1cyhjZCwgZC0+Y3B1cG9vbCkpICkKPiArICAgICAgICByZXR1cm4gcmM7Cj4gKwo+ICsgICAg aWYgKCAocmMgPSBodm1fY29weV9jb250ZXh0X2FuZF9wYXJhbXMoZCwgY2QpKSApCj4gKyAgICAg ICAgcmV0dXJuIHJjOwo+ICsKPiArICAgIGZvcmtfdHNjKGQsIGNkKTsKPiArCj4gKyAgICBjZC0+ cGFyZW50ID0gZDsKCkhvdyBkbyB5b3UgZW5zdXJlIHRoYXQgdGhlIHBhcmVudCBkb21haW4gd2ls bCBub3QgZ2V0IGRlc3Ryb3llZCBiZWZvcmUgCnRoZSBmb3JrZWQgZG9tYWluPyBEbyB5b3UgaGF2 ZSBhIHJlZmNvdW50IHNvbWV3aGVyZT8KCj4gKwo+ICsgICAgcmV0dXJuIDA7Cj4gK30KPiArCgpD aGVlcnMsCgotLSAKSnVsaWVuIEdyYWxsCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54 ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGlu Zm8veGVuLWRldmVs