From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Dunlap Subject: Re: [PATCH v2] mm: option to _always_ scrub freed domheap pages Date: Tue, 7 May 2019 14:15:35 +0100 Message-ID: References: <20190507113405.71851-1-elnikety@amazon.com> <5CD175F5020000780022C7EF@prv1-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hNzwg-00041u-AI for xen-devel@lists.xenproject.org; Tue, 07 May 2019 13:15:46 +0000 In-Reply-To: <5CD175F5020000780022C7EF@prv1-mh.provo.novell.com> Content-Language: en-US List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Jan Beulich , Eslam Elnikety Cc: Stefano Stabellini , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Tim Deegan , Julien Grall , xen-devel , Amit Shah List-Id: xen-devel@lists.xenproject.org T24gNS83LzE5IDE6MTEgUE0sIEphbiBCZXVsaWNoIHdyb3RlOgo+Pj4+IE9uIDA3LjA1LjE5IGF0 IDEzOjM0LCA8ZWxuaWtldHlAYW1hem9uLmNvbT4gd3JvdGU6Cj4+IC0tLSBhL3hlbi9jb21tb24v cGFnZV9hbGxvYy5jCj4+ICsrKyBiL3hlbi9jb21tb24vcGFnZV9hbGxvYy5jCj4+IEBAIC0yMTQs NiArMjE0LDEwIEBAIGN1c3RvbV9wYXJhbSgiYm9vdHNjcnViIiwgcGFyc2VfYm9vdHNjcnViX3Bh cmFtKTsKPj4gIHN0YXRpYyB1bnNpZ25lZCBsb25nIF9faW5pdGRhdGEgb3B0X2Jvb3RzY3J1Yl9j aHVuayA9IE1CKDEyOCk7Cj4+ICBzaXplX3BhcmFtKCJib290c2NydWJfY2h1bmsiLCBvcHRfYm9v dHNjcnViX2NodW5rKTsKPj4gIAo+PiArIC8qIHNjcnViLWRvbWhlYXAgLT4gRG9taGVhcCBwYWdl cyBhcmUgc2NydWJiZWQgd2hlbiBmcmVlZCAqLwo+PiArc3RhdGljIGJvb2wgX19yZWFkX21vc3Rs eSBvcHRfc2NydWJfZG9taGVhcDsKPj4gK2Jvb2xlYW5fcGFyYW0oInNjcnViLWRvbWhlYXAiLCBv cHRfc2NydWJfZG9taGVhcCk7Cj4gCj4gVXBvbiAybmQgdGhvdWdodCB0aGlzLCBidHcsIHdvdWxk IHNlZW0gdG8gYmUgYW4gZXhjZWxsZW50IGNhbmRpZGF0ZQo+IGZvciBiZWNvbWluZyBhIHJ1bnRp bWUgcGFyYW1ldGVyLgo+IAo+PiBAQCAtMjM3OCw5ICsyMzgyLDEwIEBAIHZvaWQgZnJlZV9kb21o ZWFwX3BhZ2VzKHN0cnVjdCBwYWdlX2luZm8gKnBnLCB1bnNpZ25lZCBpbnQgb3JkZXIpCj4+ICAg ICAgICAgICAgICAvKgo+PiAgICAgICAgICAgICAgICogTm9ybWFsbHkgd2UgZXhwZWN0IGEgZG9t YWluIHRvIGNsZWFyIHBhZ2VzIGJlZm9yZSBmcmVlaW5nIHRoZW0sCj4+ICAgICAgICAgICAgICAg KiBpZiBpdCBjYXJlcyBhYm91dCB0aGUgc2VjcmVjeSBvZiB0aGVpciBjb250ZW50cy4gSG93ZXZl ciwgYWZ0ZXIKPj4gLSAgICAgICAgICAgICAqIGEgZG9tYWluIGhhcyBkaWVkIHdlIGFzc3VtZSBy ZXNwb25zaWJpbGl0eSBmb3IgZXJhc3VyZS4KPj4gKyAgICAgICAgICAgICAqIGEgZG9tYWluIGhh cyBkaWVkIHdlIGFzc3VtZSByZXNwb25zaWJpbGl0eSBmb3IgZXJhc3VyZS4gV2UgZG8KPj4gKyAg ICAgICAgICAgICAqIHNjcnViIHJlZ2FyZGxlc3MgaWYgb3B0aW9uIHNjcnViX2RvbWhlYXAgaXMg c2V0Lgo+PiAgICAgICAgICAgICAgICovCj4+IC0gICAgICAgICAgICBzY3J1YiA9IGQtPmlzX2R5 aW5nIHx8IHNjcnViX2RlYnVnOwo+PiArICAgICAgICAgICAgc2NydWIgPSBkLT5pc19keWluZyB8 fCBzY3J1Yl9kZWJ1ZyB8fCBvcHRfc2NydWJfZG9taGVhcDsKPiAKPiBEaWQgeW91IGNvbnNpZGVy IHNldHRpbmcgb3B0X3NjcnViX2RvbWhlYXAgd2hlbiBzY3J1Yl9kZWJ1ZyBpcwo+IHNldD8gVGhp cyB3b3VsZCBzaG9ydGVuIHRoZSAocnVudGltZSkgY2FsY3VsYXRpb24gaGVyZSBieSBhIHRpbnkg Yml0LAo+IGF0IHRoZSBwcmljZSBvZiBkb2luZyBvbmUgbW9yZSB0aGluZyBvbmNlIHdoaWxlIGJv b3RpbmcuCgpKdXN0IGZvciBjbGFyaWZpY2F0aW9uIEphbiAtLSBkaWQgeW91IG1lYW4sICJJJ20g aGFwcHkgZm9yIHRoaXMgdG8gZ28gaW4KYXMgaXQgaXMsIGJ1dCBpZiB5b3UgZmVlbCBsaWtlIGl0 LCBoZXJlIGFyZSB0d28gaW1wcm92ZW1lbnRzIj8KCiAtR2VvcmdlCgpfX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhl bi1kZXZlbEBsaXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3Jn L21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E6BEC004C9 for ; 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Tue, 07 May 2019 13:15:43 +0000 (UTC) X-IronPort-AV: E=Sophos;i="5.60,441,1549929600"; d="scan'208";a="85212005" To: Jan Beulich , Eslam Elnikety References: <20190507113405.71851-1-elnikety@amazon.com> <5CD175F5020000780022C7EF@prv1-mh.provo.novell.com> From: George Dunlap Openpgp: preference=signencrypt Autocrypt: addr=george.dunlap@citrix.com; prefer-encrypt=mutual; keydata= mQINBFPqG+MBEACwPYTQpHepyshcufo0dVmqxDo917iWPslB8lauFxVf4WZtGvQSsKStHJSj 92Qkxp4CH2DwudI8qpVbnWCXsZxodDWac9c3PordLwz5/XL41LevEoM3NWRm5TNgJ3ckPA+J K5OfSK04QtmwSHFP3G/SXDJpGs+oDJgASta2AOl9vPV+t3xG6xyfa2NMGn9wmEvvVMD44Z7R W3RhZPn/NEZ5gaJhIUMgTChGwwWDOX0YPY19vcy5fT4bTIxvoZsLOkLSGoZb/jHIzkAAznug Q7PPeZJ1kXpbW9EHHaUHiCD9C87dMyty0N3TmWfp0VvBCaw32yFtM9jUgB7UVneoZUMUKeHA fgIXhJ7I7JFmw3J0PjGLxCLHf2Q5JOD8jeEXpdxugqF7B/fWYYmyIgwKutiGZeoPhl9c/7RE Bf6f9Qv4AtQoJwtLw6+5pDXsTD5q/GwhPjt7ohF7aQZTMMHhZuS52/izKhDzIufl6uiqUBge 0lqG+/ViLKwCkxHDREuSUTtfjRc9/AoAt2V2HOfgKORSCjFC1eI0+8UMxlfdq2z1AAchinU0 eSkRpX2An3CPEjgGFmu2Je4a/R/Kd6nGU8AFaE8ta0oq5BSFDRYdcKchw4TSxetkG6iUtqOO ZFS7VAdF00eqFJNQpi6IUQryhnrOByw+zSobqlOPUO7XC5fjnwARAQABtCRHZW9yZ2UgVy4g RHVubGFwIDxkdW5sYXBnQHVtaWNoLmVkdT6JAlcEEwEKAEECGwMFCwkIBwMFFQoJCAsFFgID AQACHgECF4ACGQEWIQTXqBy2bTNXPzpOYFimNjwxBZC0bQUCXEowWQUJDCJ7dgAKCRCmNjwx BZC0beKvEACJ75YlJXd7TnNHgFyiCJkm/qPeoQ3sFGSDZuZh7SKcdt9+3V2bFEb0Mii1hQaz 3hRqZb8sYPHJrGP0ljK09k3wf8k3OuNxziLQBJyzvn7WNlE4wBEcy/Ejo9TVBdA4ph5D0YaZ nqdsPmxe/xlTFuSkgu4ep1v9dfVP1TQR0e+JIBa/Ss+cKC5intKm+8JxpOploAHuzaPu0L/X FapzsIXqgT9eIQeBEgO2hge6h9Jov3WeED/vh8kA7f8c6zQ/gs5E7VGALwsiLrhr0LZFcKcw kI3oCCrB/C/wyPZv789Ra8EXbeRSJmTjcnBwHRPjnjwQmetRDD1t+VyrkC6uujT5jmgOBzaj KCqZ8PcMAssOzdzQtKmjUQ2b3ICPs2X13xZ5M5/OVs1W3TG5gkvMh4YoHi4ilFnOk+v3/j7q 65FG6N0JLb94Ndi80HkIOQQ1XVGTyu6bUPaBg3rWK91Csp1682kD/dNVF3FKHrRLmSVtmEQR 5rK0+VGc/FmR6vd4haKGWIRuPxzg+pBR77avIZpU7C7+UXGuZ5CbHwIdY8LojJg2TuUdqaVj yxmEZLOA8rVHipCGrslRNthVbJrGN/pqtKjCClFZHIAYJQ9EGLHXLG9Pj76opfjHij3MpR3o pCGAh6KsCrfrsvjnpDwqSbngGyEVH030irSk4SwIqZ7FwLkBDQRUWmc6AQgAzpc8Ng5Opbrh iZrn69Xr3js28p+b4a+0BOvC48NfrNovZw4eFeKIzmI/t6EkJkSqBIxobWRpBkwGweENsqnd 0qigmsDw4N7J9Xx0h9ARDqiWxX4jr7u9xauI+CRJ1rBNO3VV30QdACwQ4LqhR/WA+IjdhyMH wj3EJGE61NdP/h0zfaLYAbvEg47/TPThFsm4m8Rd6bX7RkrrOgBbL/AOnYOMEivyfZZKX1vv iEemAvLfdk2lZt7Vm6X/fbKbV8tPUuZELzNedJvTTBS3/l1FVz9OUcLDeWhGEdlxqXH0sYWh E9+PXTAfz5JxKH+LMetwEM8DbuOoDIpmIGZKrZ+2fQARAQABiQNbBBgBCgAmAhsCFiEE16gc tm0zVz86TmBYpjY8MQWQtG0FAlxKMJ4FCQnQ/OQBKcBdIAQZAQoABgUCVFpnOgAKCRCyFcen x4Qb7cXrCAC0qQeEWmLa9oEAPa+5U6wvG1t/mi22gZN6uzQXH1faIOoDehr7PPESE6tuR/vI CTTnaSrd4UDPNeqOqVF07YexWD1LDcQG6PnRqC5DIX1RGE3BaSaMl2pFJP8y+chews11yP8G DBbxaIsTcHZI1iVIC9XLhoeegWi84vYc8F4ziADVfowbmbvcVw11gE8tmALCwTeBeZVteXjh 0OELHwrc1/4j4yvENjIXRO+QLIgk43kB57Upr4tP2MEcs0odgPM+Q+oETOJ00xzLgkTnLPim C1FIW2bOZdTj+Uq6ezRS2LKsNmW+PRRvNyA5ojEbA/faxmAjMZtLdSSSeFK8y4SoCRCmNjwx BZC0bevWEACRu+GyQgrdGmorUptniIeO1jQlpTiP5WpVnk9Oe8SiLoXUhXXNj6EtzyLGpYmf kEAbki+S6WAKnzZd3shL58AuMyDxtFNNjNeKJOcl6FL7JPBIIgIp3wR401Ep+/s5pl3Nw8Ii 157f0T7o8CPb54w6S1WsMkU78WzTxIs/1lLblSMcvyz1Jq64g4OqiWI85JfkzPLlloVf1rzy ebIBLrrmjhCE2tL1RONpE/KRVb+Q+PIs5+YcZ+Q1e0vXWA7NhTWFbWx3+N6WW6gaGpbFbopo FkYRpj+2TA5cX5zW148/xU5/ATEb5vdUkFLUFVy5YNUSyeBHuaf6fGmBrDc47rQjAOt1rmyD 56MUBHpLUbvA6NkPezb7T6bQpupyzGRkMUmSwHiLyQNJQhVe+9NiJJvtEE3jol0JVJoQ9WVn FAzPNCgHQyvbsIF3gYkCYKI0w8EhEoH5FHYLoKS6Jg880IY5rXzoAEfPvLXegy6mhYl+mNVN QUBD4h9XtOvcdzR559lZuC0Ksy7Xqw3BMolmKsRO3gWKhXSna3zKl4UuheyZtubVWoNWP/bn vbyiYnLwuiKDfNAinEWERC8nPKlv3PkZw5d3t46F1Dx0TMf16NmP+azsRpnMZyzpY8BL2eur feSGAOB9qjZNyzbo5nEKHldKWCKE7Ye0EPEjECS1gjKDwbkBDQRUWrq9AQgA7aJ0i1pQSmUR 6ZXZD2YEDxia2ByR0uZoTS7N0NYv1OjU8v6p017u0Fco5+Qoju/fZ97ScHhp5xGVAk5kxZBF DT4ovJd0nIeSr3bbWwfNzGx1waztfdzXt6n3MBKr7AhioB1m+vuk31redUdnhbtvN7O40MC+ fgSk5/+jRGxY3IOVPooQKzUO7M51GoOg4wl9ia3H2EzOoGhN2vpTbT8qCcL92ZZZwkBRldoA Wn7c1hEKSTuT3f1VpSmhjnX0J4uvKZ1V2R7rooKJYFBcySC0wa8aTmAtAvLgfcpe+legOtgq DKzLuN45xzEjyjCiI521t8zxNMPJY9FiCPNv0sCkDwARAQABiQI8BBgBCgAmAhsMFiEE16gc tm0zVz86TmBYpjY8MQWQtG0FAlxKNJYFCQnQrVkACgkQpjY8MQWQtG2Xxg//RrRP+PFYuNXt 9C5hec/JoY24TkGPPd2tMC9usWZVImIk7VlHlAeqHeE0lWU0LRGIvOBITbS9izw6fOVQBvCA Fni56S12fKLusWgWhgu03toT9ZGxZ9W22yfw5uThSHQ4y09wRWAIYvhJsKnPGGC2KDxFvtz5 4pYYNe8Icy4bwsxcgbaSFaRh+mYtts6wE9VzyJvyfTqbe8VrvE+3InG5rrlNn51AO6M4Wv20 iFEgYanJXfhicl0WCQrHyTLfdB5p1w+072CL8uryHQVfD0FcDe+J/wl3bmYze+aD1SlPzFoI MaSIXKejC6oh6DAT4rvU8kMAbX90T834Mvbc3jplaWorNJEwjAH/r+v877AI9Vsmptis+rni JwUissjRbcdlkKBisoUZRPmxQeUifxUpqgulZcYwbEC/a49+WvbaYUriaDLHzg9xisijHwD2 yWV8igBeg+cmwnk0mPz8tIVvwi4lICAgXob7HZiaqKnwaDXs4LiS4vdG5s/ElnE3rIc87yru 24n3ypeDZ6f5LkdqL1UNp5/0Aqbr3EiN7/ina4YVyscy9754l944kyHnnMRLVykg0v+kakj0 h0RJ5LbfLAMM8M52KIA3y14g0Fb7kHLcOUMVcgfQ3PrN6chtC+5l6ouDIlSLR3toxH8Aam7E rIFfe2Dk+lD9A9BVd2rfoHA= Message-ID: Date: Tue, 7 May 2019 14:15:35 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <5CD175F5020000780022C7EF@prv1-mh.provo.novell.com> Content-Language: en-US Subject: Re: [Xen-devel] [PATCH v2] mm: option to _always_ scrub freed domheap pages 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 , Tim Deegan , Julien Grall , xen-devel , Amit Shah Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Message-ID: <20190507131535.ILNKGHvsrVGPzKNlkqABBGZhgZGBczXR7ncc8peCXnQ@z> T24gNS83LzE5IDE6MTEgUE0sIEphbiBCZXVsaWNoIHdyb3RlOgo+Pj4+IE9uIDA3LjA1LjE5IGF0 IDEzOjM0LCA8ZWxuaWtldHlAYW1hem9uLmNvbT4gd3JvdGU6Cj4+IC0tLSBhL3hlbi9jb21tb24v cGFnZV9hbGxvYy5jCj4+ICsrKyBiL3hlbi9jb21tb24vcGFnZV9hbGxvYy5jCj4+IEBAIC0yMTQs NiArMjE0LDEwIEBAIGN1c3RvbV9wYXJhbSgiYm9vdHNjcnViIiwgcGFyc2VfYm9vdHNjcnViX3Bh cmFtKTsKPj4gIHN0YXRpYyB1bnNpZ25lZCBsb25nIF9faW5pdGRhdGEgb3B0X2Jvb3RzY3J1Yl9j aHVuayA9IE1CKDEyOCk7Cj4+ICBzaXplX3BhcmFtKCJib290c2NydWJfY2h1bmsiLCBvcHRfYm9v dHNjcnViX2NodW5rKTsKPj4gIAo+PiArIC8qIHNjcnViLWRvbWhlYXAgLT4gRG9taGVhcCBwYWdl cyBhcmUgc2NydWJiZWQgd2hlbiBmcmVlZCAqLwo+PiArc3RhdGljIGJvb2wgX19yZWFkX21vc3Rs eSBvcHRfc2NydWJfZG9taGVhcDsKPj4gK2Jvb2xlYW5fcGFyYW0oInNjcnViLWRvbWhlYXAiLCBv cHRfc2NydWJfZG9taGVhcCk7Cj4gCj4gVXBvbiAybmQgdGhvdWdodCB0aGlzLCBidHcsIHdvdWxk IHNlZW0gdG8gYmUgYW4gZXhjZWxsZW50IGNhbmRpZGF0ZQo+IGZvciBiZWNvbWluZyBhIHJ1bnRp bWUgcGFyYW1ldGVyLgo+IAo+PiBAQCAtMjM3OCw5ICsyMzgyLDEwIEBAIHZvaWQgZnJlZV9kb21o ZWFwX3BhZ2VzKHN0cnVjdCBwYWdlX2luZm8gKnBnLCB1bnNpZ25lZCBpbnQgb3JkZXIpCj4+ICAg ICAgICAgICAgICAvKgo+PiAgICAgICAgICAgICAgICogTm9ybWFsbHkgd2UgZXhwZWN0IGEgZG9t YWluIHRvIGNsZWFyIHBhZ2VzIGJlZm9yZSBmcmVlaW5nIHRoZW0sCj4+ICAgICAgICAgICAgICAg KiBpZiBpdCBjYXJlcyBhYm91dCB0aGUgc2VjcmVjeSBvZiB0aGVpciBjb250ZW50cy4gSG93ZXZl ciwgYWZ0ZXIKPj4gLSAgICAgICAgICAgICAqIGEgZG9tYWluIGhhcyBkaWVkIHdlIGFzc3VtZSBy ZXNwb25zaWJpbGl0eSBmb3IgZXJhc3VyZS4KPj4gKyAgICAgICAgICAgICAqIGEgZG9tYWluIGhh cyBkaWVkIHdlIGFzc3VtZSByZXNwb25zaWJpbGl0eSBmb3IgZXJhc3VyZS4gV2UgZG8KPj4gKyAg ICAgICAgICAgICAqIHNjcnViIHJlZ2FyZGxlc3MgaWYgb3B0aW9uIHNjcnViX2RvbWhlYXAgaXMg c2V0Lgo+PiAgICAgICAgICAgICAgICovCj4+IC0gICAgICAgICAgICBzY3J1YiA9IGQtPmlzX2R5 aW5nIHx8IHNjcnViX2RlYnVnOwo+PiArICAgICAgICAgICAgc2NydWIgPSBkLT5pc19keWluZyB8 fCBzY3J1Yl9kZWJ1ZyB8fCBvcHRfc2NydWJfZG9taGVhcDsKPiAKPiBEaWQgeW91IGNvbnNpZGVy IHNldHRpbmcgb3B0X3NjcnViX2RvbWhlYXAgd2hlbiBzY3J1Yl9kZWJ1ZyBpcwo+IHNldD8gVGhp cyB3b3VsZCBzaG9ydGVuIHRoZSAocnVudGltZSkgY2FsY3VsYXRpb24gaGVyZSBieSBhIHRpbnkg Yml0LAo+IGF0IHRoZSBwcmljZSBvZiBkb2luZyBvbmUgbW9yZSB0aGluZyBvbmNlIHdoaWxlIGJv b3RpbmcuCgpKdXN0IGZvciBjbGFyaWZpY2F0aW9uIEphbiAtLSBkaWQgeW91IG1lYW4sICJJJ20g aGFwcHkgZm9yIHRoaXMgdG8gZ28gaW4KYXMgaXQgaXMsIGJ1dCBpZiB5b3UgZmVlbCBsaWtlIGl0 LCBoZXJlIGFyZSB0d28gaW1wcm92ZW1lbnRzIj8KCiAtR2VvcmdlCgpfX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhl bi1kZXZlbEBsaXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3Jn L21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs