From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tamas K Lengyel Subject: Re: [PATCH v5 1/2] x86/mem-sharing: Bulk mem-sharing entire domains Date: Thu, 23 Jun 2016 09:42:48 -0600 Message-ID: References: <1465687481-10095-1-git-send-email-tamas@tklengyel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta14.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bG6mK-00055O-Rn for xen-devel@lists.xenproject.org; Thu, 23 Jun 2016 15:42:52 +0000 Received: by mail-wm0-f67.google.com with SMTP id r201so11978070wme.0 for ; Thu, 23 Jun 2016 08:42:51 -0700 (PDT) Received: from mail-wm0-f44.google.com (mail-wm0-f44.google.com. [74.125.82.44]) by smtp.gmail.com with ESMTPSA id t1sm731644wjy.3.2016.06.23.08.42.49 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 23 Jun 2016 08:42:50 -0700 (PDT) Received: by mail-wm0-f44.google.com with SMTP id v199so131889310wmv.0 for ; Thu, 23 Jun 2016 08:42:49 -0700 (PDT) In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: George Dunlap Cc: xen-devel List-Id: xen-devel@lists.xenproject.org T24gV2VkLCBKdW4gMjIsIDIwMTYgYXQgOTozOCBBTSwgR2VvcmdlIER1bmxhcCA8ZHVubGFwZ0B1 bWljaC5lZHU+IHdyb3RlOgo+IE9uIFN1biwgSnVuIDEyLCAyMDE2IGF0IDEyOjI0IEFNLCBUYW1h cyBLIExlbmd5ZWwgPHRhbWFzQHRrbGVuZ3llbC5jb20+IHdyb3RlOgo+PiBDdXJyZW50bHkgbWVt LXNoYXJpbmcgY2FuIGJlIHBlcmZvcm1lZCBvbiBhIHBhZ2UtYnktcGFnZSBiYXNlIGZyb20gdGhl IGNvbnRyb2wKPj4gZG9tYWluLiBIb3dldmVyLCB3aGVuIGNvbXBsZXRlbHkgZGVkdXBsaWNhdGlu ZyAoY2xvbmluZykgYSBWTSwgdGhpcyByZXF1aXJlcwo+PiBhdCBsZWFzdCAzIGh5cGVyY2FsbHMg cGVyIHBhZ2UuIEFzIHRoZSB1c2VyIGhhcyB0byBsb29wIHRocm91Z2ggYWxsIHBhZ2VzIHVwCj4+ IHRvIG1heF9ncGZuLCB0aGlzIHByb2Nlc3MgaXMgdmVyeSBzbG93IGFuZCB3YXN0ZWZ1bC4KPj4K Pj4gVGhpcyBwYXRjaCBpbnRyb2R1Y2VzIGEgbmV3IG1lbV9zaGFyaW5nIG1lbW9wIGZvciBidWxr IGRlZHVwbGljYXRpb24gd2hlcmUKPj4gdGhlIHVzZXIgZG9lc24ndCBoYXZlIHRvIHNlcGFyYXRl bHkgbm9taW5hdGUgZWFjaCBwYWdlIGluIGJvdGggdGhlIHNvdXJjZSBhbmQKPj4gZGVzdGluYXRp b24gZG9tYWluLCBhbmQgdGhlIGxvb3Bpbmcgb3ZlciBhbGwgcGFnZXMgaGFwcGVuIGluIHRoZSBo eXBlcnZpc29yLgo+PiBUaGlzIHNpZ25pZmljYW50bHkgcmVkdWNlcyB0aGUgb3ZlcmhlYWQgb2Yg Y29tcGxldGVseSBkZWR1cGxpY2F0aW5nIGVudGlyZQo+PiBkb21haW5zLgo+Pgo+PiBTaWduZWQt b2ZmLWJ5OiBUYW1hcyBLIExlbmd5ZWwgPHRhbWFzQHRrbGVuZ3llbC5jb20+Cj4+IEFja2VkLWJ5 OiBXZWkgTGl1IDx3ZWkubGl1MkBjaXRyaXguY29tPgo+PiAtLS0KPj4gSWFuIEphY2tzb24gPGlh bi5qYWNrc29uQGV1LmNpdHJpeC5jb20+Cj4+IEdlb3JnZSBEdW5sYXAgPGdlb3JnZS5kdW5sYXBA ZXUuY2l0cml4LmNvbT4KPj4gSmFuIEJldWxpY2ggPGpiZXVsaWNoQHN1c2UuY29tPgo+PiBBbmRy ZXcgQ29vcGVyIDxhbmRyZXcuY29vcGVyM0BjaXRyaXguY29tPgo+Cj4gSSdtIHNvcnJ5IEknbSBh IGJpdCBsYXRlIHRvIHRoaXMgcGFydHkgLS0gSSdtIG5vdCBzdXJlIGhvdyBJIG1hbmFnZWQKPiB0 byBtaXNzIHRoZSBlYXJsaWVyIHBvc3RzIG9mIHRoaXMuICBBIGNvdXBsZSBvZiBxdWVzdGlvbnMu Li4KPgo+Cj4+IEBAIC0xNDY4LDYgKzE1MTYsNzkgQEAgaW50IG1lbV9zaGFyaW5nX21lbW9wKFhF Tl9HVUVTVF9IQU5ETEVfUEFSQU0oeGVuX21lbV9zaGFyaW5nX29wX3QpIGFyZykKPj4gICAgICAg ICAgfQo+PiAgICAgICAgICBicmVhazsKPj4KPj4gKyAgICAgICAgY2FzZSBYRU5NRU1fc2hhcmlu Z19vcF9idWxrX3NoYXJlOgo+PiArICAgICAgICB7Cj4+ICsgICAgICAgICAgICB1bnNpZ25lZCBs b25nIG1heF9zZ2ZuLCBtYXhfY2dmbjsKPj4gKyAgICAgICAgICAgIHN0cnVjdCBkb21haW4gKmNk Owo+PiArCj4+ICsgICAgICAgICAgICByYyA9IC1FSU5WQUw7Cj4+ICsgICAgICAgICAgICBpZigg bXNvLnUuYnVsay5fcGFkWzBdIHx8IG1zby51LmJ1bGsuX3BhZFsxXSB8fCBtc28udS5idWxrLl9w YWRbMl0gKQo+PiArICAgICAgICAgICAgICAgIGdvdG8gb3V0Owo+PiArCj4+ICsgICAgICAgICAg ICBpZiAoICFtZW1fc2hhcmluZ19lbmFibGVkKGQpICkKPj4gKyAgICAgICAgICAgICAgICBnb3Rv IG91dDsKPj4gKwo+PiArICAgICAgICAgICAgcmMgPSByY3VfbG9ja19saXZlX3JlbW90ZV9kb21h aW5fYnlfaWQobXNvLnUuYnVsay5jbGllbnRfZG9tYWluLAo+PiArICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgJmNkKTsKPj4gKyAgICAgICAgICAgIGlm ICggcmMgKQo+PiArICAgICAgICAgICAgICAgIGdvdG8gb3V0Owo+PiArCj4+ICsgICAgICAgICAg ICAvKgo+PiArICAgICAgICAgICAgICogV2UgcmV1c2UgWEVOTUVNX3NoYXJpbmdfb3Bfc2hhcmUg WFNNIGNoZWNrIGhlcmUgYXMgdGhpcyBpcyBlc3NlbnRpYWxseQo+PiArICAgICAgICAgICAgICog dGhlIHNhbWUgY29uY2VwdCByZXBlYXRlZCBvdmVyIG11bHRpcGxlIHBhZ2VzLgo+PiArICAgICAg ICAgICAgICovCj4+ICsgICAgICAgICAgICByYyA9IHhzbV9tZW1fc2hhcmluZ19vcChYU01fRE1f UFJJViwgZCwgY2QsIFhFTk1FTV9zaGFyaW5nX29wX3NoYXJlKTsKPj4gKyAgICAgICAgICAgIGlm ICggcmMgKQo+PiArICAgICAgICAgICAgewo+PiArICAgICAgICAgICAgICAgIHJjdV91bmxvY2tf ZG9tYWluKGNkKTsKPj4gKyAgICAgICAgICAgICAgICBnb3RvIG91dDsKPj4gKyAgICAgICAgICAg IH0KPj4gKwo+PiArICAgICAgICAgICAgaWYgKCAhbWVtX3NoYXJpbmdfZW5hYmxlZChjZCkgKQo+ PiArICAgICAgICAgICAgewo+PiArICAgICAgICAgICAgICAgIHJjdV91bmxvY2tfZG9tYWluKGNk KTsKPj4gKyAgICAgICAgICAgICAgICByYyA9IC1FSU5WQUw7Cj4+ICsgICAgICAgICAgICAgICAg Z290byBvdXQ7Cj4+ICsgICAgICAgICAgICB9Cj4+ICsKPj4gKyAgICAgICAgICAgIGlmICggIWF0 b21pY19yZWFkKCZkLT5wYXVzZV9jb3VudCkgfHwKPj4gKyAgICAgICAgICAgICAgICAgIWF0b21p Y19yZWFkKCZjZC0+cGF1c2VfY291bnQpICkKPj4gKyAgICAgICAgICAgIHsKPj4gKyAgICAgICAg ICAgICAgICByY3VfdW5sb2NrX2RvbWFpbihjZCk7Cj4+ICsgICAgICAgICAgICAgICAgcmMgPSAt RUlOVkFMOwo+PiArICAgICAgICAgICAgICAgIGdvdG8gb3V0Owo+PiArICAgICAgICAgICAgfQo+ Cj4gSSByZWFsaXplIHRoYXQgSmFuIGFza2VkIGZvciB0aGlzLCBidXQgSSdtIHJlYWxseSBub3Qg c3VyZSB3aGF0IGdvb2QKPiB0aGlzIGlzIHN1cHBvc2VkIHRvIGRvLCBzaW5jZSB0aGUgZ3Vlc3Qg Y2FuIGJlIHVuLXBhdXNlZCBhdCBhbnkgcG9pbnQKPiBoYWxmd2F5IHRocm91Z2ggdGhlIHRyYW5z YWN0aW9uLgo+Cj4gV291bGRuJ3QgaXQgbWFrZSBtb3JlIHNlbnNlIHRvIGhhdmUgdGhpcyBmdW5j dGlvbiBwYXVzZSBhbmQgdW5wYXVzZQo+IHRoZSBkb21haW5zIGl0c2VsZj8KClRoZSBkb21haW5z IGFyZSBwYXVzZWQgYnkgdGhlIHVzZXIgd2hlbiB0aGlzIG9wIGlzIGNhbGxlZCwgc28gdGhpcyBp cwpqdXN0IGEgc2FuaXR5IGNoZWNrIGVuc3VyaW5nIHlvdSBhcmUgbm90IGlzc3VpbmcgdGhlIG9w IG9uIHNvbWUgb3RoZXIKZG9tYWluLiBTbyBpZiB0aGlzIGZ1bmN0aW9uIHdvdWxkIHBhdXNlIHRo ZSBkb21haW4gYXMgd2VsbCBhbGwgaXQKd291bGQgZG8gaXMgaW5jcmVhc2UgdGhlIHBhdXNlIGNv dW50LiBUaGlzIGlzIHRoZSBvbmx5IGludGVuZGVkCnVzZS1jYXNlIGZvciB0aGlzIGZ1bmN0aW9u IGF0IHRoaXMgdGltZS4gSXQgd291bGQgbWFrZSBubyBzZW5zZSB0byB0cnkKdG8gaXNzdWUgdGhp cyBvcCBvbiBkb21haW5zIHRoYXQgYXJlIHJ1bm5pbmcsIGFzIHRoYXQgcHJldHR5IG11Y2gKZ3Vh cmFudGVlIHRoYXQgc29tZSBvZiB0aGVpciBtZW1vcnkgaGFzIGFscmVhZHkgZGl2ZXJnZWQsIGFu ZCB0aHVzCmJ1bGstc2hhcmluZyB0aGVpciBtZW1vcnkgd291bGQgaGF2ZSBzb21lIHVuaW50ZW5k ZWQgc2lkZS1lZmZlY3RzLgoKPgo+PiArCj4+ICsgICAgICAgICAgICBtYXhfc2dmbiA9IGRvbWFp bl9nZXRfbWF4aW11bV9ncGZuKGQpOwo+PiArICAgICAgICAgICAgbWF4X2NnZm4gPSBkb21haW5f Z2V0X21heGltdW1fZ3BmbihjZCk7Cj4+ICsKPj4gKyAgICAgICAgICAgIGlmICggbWF4X3NnZm4g IT0gbWF4X2NnZm4gfHwgbWF4X3NnZm4gPCBtc28udS5idWxrLnN0YXJ0ICkKPj4gKyAgICAgICAg ICAgIHsKPj4gKyAgICAgICAgICAgICAgICByY3VfdW5sb2NrX2RvbWFpbihjZCk7Cj4+ICsgICAg ICAgICAgICAgICAgcmMgPSAtRUlOVkFMOwo+PiArICAgICAgICAgICAgICAgIGdvdG8gb3V0Owo+ PiArICAgICAgICAgICAgfQo+PiArCj4+ICsgICAgICAgICAgICByYyA9IGJ1bGtfc2hhcmUoZCwg Y2QsIG1heF9zZ2ZuICsgMSwgJm1zby51LmJ1bGspOwo+PiArICAgICAgICAgICAgaWYgKCByYyA+ IDAgKQo+PiArICAgICAgICAgICAgewo+PiArICAgICAgICAgICAgICAgIGlmICggX19jb3B5X3Rv X2d1ZXN0KGFyZywgJm1zbywgMSkgKQo+PiArICAgICAgICAgICAgICAgICAgICByYyA9IC1FRkFV TFQ7Cj4+ICsgICAgICAgICAgICAgICAgZWxzZQo+PiArICAgICAgICAgICAgICAgICAgICByYyA9 IGh5cGVyY2FsbF9jcmVhdGVfY29udGludWF0aW9uKF9fSFlQRVJWSVNPUl9tZW1vcnlfb3AsCj4+ ICsgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ImxoIiwgWEVOTUVNX3NoYXJpbmdfb3AsCj4+ICsgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgYXJnKTsKPj4gKyAgICAgICAgICAgIH0KPj4gKyAg ICAgICAgICAgIGVsc2UKPj4gKyAgICAgICAgICAgIHsKPj4gKyAgICAgICAgICAgICAgICBtc28u dS5idWxrLnN0YXJ0ID0gMDsKPj4gKyAgICAgICAgICAgICAgICBtc28udS5idWxrLnNoYXJlZCA9 IGF0b21pY19yZWFkKCZjZC0+c2hyX3BhZ2VzKTsKPj4gKyAgICAgICAgICAgIH0KPj4gKwo+PiAr ICAgICAgICAgICAgcmN1X3VubG9ja19kb21haW4oY2QpOwo+PiArICAgICAgICB9Cj4+ICsgICAg ICAgIGJyZWFrOwo+PiArCj4+ICAgICAgICAgIGNhc2UgWEVOTUVNX3NoYXJpbmdfb3BfZGVidWdf Z2ZuOgo+PiAgICAgICAgICB7Cj4+ICAgICAgICAgICAgICB1bnNpZ25lZCBsb25nIGdmbiA9IG1z by51LmRlYnVnLnUuZ2ZuOwo+PiBkaWZmIC0tZ2l0IGEveGVuL2luY2x1ZGUvcHVibGljL21lbW9y eS5oIGIveGVuL2luY2x1ZGUvcHVibGljL21lbW9yeS5oCj4+IGluZGV4IDI5ZWM1NzEuLjA4NGYw NmUgMTAwNjQ0Cj4+IC0tLSBhL3hlbi9pbmNsdWRlL3B1YmxpYy9tZW1vcnkuaAo+PiArKysgYi94 ZW4vaW5jbHVkZS9wdWJsaWMvbWVtb3J5LmgKPj4gQEAgLTQ2NSw2ICs0NjUsNyBAQCBERUZJTkVf WEVOX0dVRVNUX0hBTkRMRSh4ZW5fbWVtX2FjY2Vzc19vcF90KTsKPj4gICNkZWZpbmUgWEVOTUVN X3NoYXJpbmdfb3BfZGVidWdfZ3JlZiAgICAgICAgNQo+PiAgI2RlZmluZSBYRU5NRU1fc2hhcmlu Z19vcF9hZGRfcGh5c21hcCAgICAgICA2Cj4+ICAjZGVmaW5lIFhFTk1FTV9zaGFyaW5nX29wX2F1 ZGl0ICAgICAgICAgICAgIDcKPj4gKyNkZWZpbmUgWEVOTUVNX3NoYXJpbmdfb3BfYnVsa19zaGFy ZSAgICAgICAgOAo+Pgo+PiAgI2RlZmluZSBYRU5NRU1fU0hBUklOR19PUF9TX0hBTkRMRV9JTlZB TElEICAoLTEwKQo+PiAgI2RlZmluZSBYRU5NRU1fU0hBUklOR19PUF9DX0hBTkRMRV9JTlZBTElE ICAoLTkpCj4+IEBAIC01MDAsNyArNTAxLDE5IEBAIHN0cnVjdCB4ZW5fbWVtX3NoYXJpbmdfb3Ag ewo+PiAgICAgICAgICAgICAgdWludDY0X2FsaWduZWRfdCBjbGllbnRfZ2ZuOyAgICAvKiBJTjog dGhlIGNsaWVudCBnZm4gKi8KPj4gICAgICAgICAgICAgIHVpbnQ2NF9hbGlnbmVkX3QgY2xpZW50 X2hhbmRsZTsgLyogSU46IGhhbmRsZSB0byB0aGUgY2xpZW50IHBhZ2UgKi8KPj4gICAgICAgICAg ICAgIGRvbWlkX3QgIGNsaWVudF9kb21haW47IC8qIElOOiB0aGUgY2xpZW50IGRvbWFpbiBpZCAq Lwo+PiAtICAgICAgICB9IHNoYXJlOwo+PiArICAgICAgICB9IHNoYXJlOwo+PiArICAgICAgICBz dHJ1Y3QgbWVtX3NoYXJpbmdfb3BfYnVsayB7ICAgICAgICAgLyogT1BfQlVMS19TSEFSRSAqLwo+ PiArICAgICAgICAgICAgdWludDY0X2FsaWduZWRfdCBzdGFydDsgICAgICAgICAgLyogSU46IHN0 YXJ0IGdmbi4gU2V0IHRvIDAgZm9yCj4+ICsgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICAgICBmdWxsIGRlZHVwbGljYXRpb24uIEZpZWxkIGlzCj4+ICsgICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICByZXNldCB0byAwIHdoZW4g aHlwZXJjYWxsCj4+ICsgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICBjb21wbGV0ZXMgKi8KPgo+IEl0IHRvb2sgbWUgYSB3aGlsZSB0byBmaWd1cmUgb3V0IHRo YXQgdGhpcyB2YWx1ZSBpc24ndCBhY3R1YWxseQo+IGludGVuZGVkIHRvIGJlIHVzZWQgYXMgZGVz Y3JpYmVkLiAgWW91J3JlIGFjdHVhbGx5IGludGVuZGVkIHRvIGFsd2F5cwo+IHNldCB0aGlzIHRv IHplcm8sIGFuZCB0aGUgaHlwZXJ2aXNvciBqdXN0IHVzZXMgaXQgZm9yIHNjcmF0Y2ggc3BhY2Uu CgpJbiBteSBvcmlnaW5hbCBwYXRjaCB0aGVyZSB3YXMgbm8gZmllbGQgc3VjaCBhcyB0aGlzIGJ1 dCB3YXMgcmVxdWVzdGVkCmJ5IG90aGVyIE1haW50YWluZXJzLiBTbyB0ZWNobmljYWxseSBpdCBp cyBub3cgcG9zc2libGUgdG8gc3RhcnQKYnVsay1zaGFyaW5nIGF0IGEgcGZuIG90aGVyIHRoZW4g MCBhbmQgdGhlIG9wIHdvdWxkIHdvcmssIGl0IHdvdWxkCmp1c3QgcmVzdWx0IGluIGxlc3MgdGhl biBmdWxsIHNoYXJpbmcuIEkgY2VydGFpbmx5IGhhdmUgbm8gdXNlLWNhc2UKZm9yIGl0IGJ1dCBp dCBpcyBwb3NzaWJsZSB0byB1c2UgaXQgdGhhdCB3YXkgc28gSSBzaW1wbHkgZG9jdW1lbnRlZAp0 aGF0IHVuaW50ZW5kZWQgImZlYXR1cmUiLgoKPgo+IFRvIHN0YXJ0IHdpdGgsIGl0IHNlZW1zIGxp a2UgaGF2aW5nIGEgImJ1bGsgc2hhcmUiIG9wdGlvbiB3aGljaCBjb3VsZAo+IGRvIGp1c3QgYSBz cGVjaWZpYyByYW5nZSB3b3VsZCBiZSB1c2VmdWwgYXMgd2VsbCBhcyBhICJidWxrIHNoYXJlIgo+ IHdoaWNoIGF1dG9tYXRpY2FsbHkgZGVkdXBlZCB0aGUgZW50aXJlIHNldCBvZiBtZW1vcnkuCgpJ IGhhdmUgbm8gbmVlZCBmb3Igc3VjaCBvcHRpb25zLgoKPgo+IFNlY29uZGx5LCBzdHJ1Y3R1cmlu ZyB0aGUgaW5mb3JtYXRpb24gbGlrZSB0aGUgb3RoZXIgbWVtb3J5IG9wZXJhdGlvbnMKPiAtLSBm b3IgZXhhbXBsZSwgIm5yX2V4dGVudHMiIGFuZCAibnJfZG9uZSIgLS0gd291bGQgbWFrZSBpdCBt b3JlCj4gY29uc2lzdGVudCwgYW5kIHdvdWxkIGFsbG93IHlvdSB0byBhbHNvIHRvIGF2b2lkIG92 ZXJ3cml0aW5nIG9uZSBvZgo+IHRoZSAiaW4iIHZhbHVlcyBhbmQgaGF2aW5nIHRvIHJlc3RvcmUg aXQgd2hlbiB5b3Ugd2VyZSBkb25lLgoKSSBkb24ndCBzZWUgYW55IGhhcm0gaW4gY2xlYXJpbmcg dGhpcyB2YWx1ZSB0byAwIHdoZW4gdGhlIG9wIGZpbmlzaGVzCnNvIEkgZG9uJ3QgdGhpbmsgaXQg d291bGQgcmVhbGx5IG1ha2UgbXVjaCBkaWZmZXJlbmNlIGlmIHdlIGhhdmUKYW5vdGhlciBmaWVs ZCBqdXN0IGZvciBzY3JhdGNoLXNwYWNlIHVzZS4gSSdtIGZpbmUgd2l0aCBhZGRpbmcgdGhhdApi dXQgaXQganVzdCBzZWVtcyBhIGJpdCBvZGQgdG8gbWUuCgpUYW1hcwoKX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlzdApY ZW4tZGV2ZWxAbGlzdHMueGVuLm9yZwpodHRwOi8vbGlzdHMueGVuLm9yZy94ZW4tZGV2ZWwK