From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Grall Subject: Re: [PATCH] xen/arm: skip first page when RAM starts at 0x0 Date: Mon, 29 Apr 2019 16:54:35 +0100 Message-ID: <10687f88-fb6b-721c-c6e8-a1ab06023616@arm.com> References: <1556214715-22030-1-git-send-email-sstabellini@kernel.org> <981e7b3f-464b-d37c-e03e-22408ae65f85@arm.com> <5CC2CB8C02000078002295AA@prv1-mh.provo.novell.com> <5CC2D27C02000078002295F6@prv1-mh.provo.novell.com> <43510317-ca8a-ed23-835a-86a28286b919@arm.com> <5CC3283A0200007800229832@prv1-mh.provo.novell.com> <72a0eee1-1d29-2368-3737-d37f7a4926c6@arm.com> <5CC6A47E0200007800229D67@prv1-mh.provo.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" 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 1hL8c4-0001tB-8V for xen-devel@lists.xenproject.org; Mon, 29 Apr 2019 15:54:40 +0000 In-Reply-To: <5CC6A47E0200007800229D67@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 , Stefano Stabellini Cc: Andrew Cooper , Stefano Stabellini , nd@arm.com, 206497@studenti.unimore.it, xen-devel List-Id: xen-devel@lists.xenproject.org SGksCgpPbiAyOS8wNC8yMDE5IDA4OjE1LCBKYW4gQmV1bGljaCB3cm90ZToKPj4+PiBPbiAyNy4w NC4xOSBhdCAwMTo0NywgPHNzdGFiZWxsaW5pQGtlcm5lbC5vcmc+IHdyb3RlOgo+PiBUaGUgb3Ro ZXIgY2hhbmdlIHRvIG5yX3BkeHMgaXMgbGVzcyBvYnZpb3VzLiBJdCBpcyBjbGVhciB0aGF0IG5y X3BkeHMgaXMKPj4gY2FsY3VsYXRlZCB3cm9uZ2x5IGluIHRoaXMgY2FzZSAobWVtb3J5IDAtMHg4 MDAwMDAwMCwKPj4gMHg4MDAwMDAwMDAtMHg4ODAwMDAwMDAsIHBzPTAsIHBlPTB4ODgwMDAwMDAw KTogbnJfcGR4cz01MjQyODggd2hpY2ggaXMKPj4gaGFsZiB0aGUgbnVtYmVyIHdlIG5lZWQgKHRo ZSBjb3JyZWN0IG51bWJlciBpcyAxMDQ4NTc1KS4KPj4KPj4gVGFraW5nIGEgbGluZSBmcm9tIHRo ZSB4ODYgY29kZSB4ZW4vYXJjaC94ODYvc2V0dXAuYzpzZXR1cF9tYXhfcGR4Cj4+IChKdWxpZW4n cyBzdWdnZXN0aW9uKToKPj4KPj4gICAgbWF4X3BkeCA9IHBmbl90b19wZHgodG9wX3BhZ2UgLSAx KSArIDE7Cj4+Cj4+IEkgY2hhbmdlZCBucl9wZHhzIHRvCj4+ICAgIAo+PiAgICBucl9wZHhzID0g cGZuX3RvX3BkeCgocGUgPj4gUEFHRV9TSElGVCkgLSAxKSArIDE7Cj4+Cj4+IGFuZCBpdCB3b3Jr cy4gSSB0aGluayB0aGUgY2hhbmdlIGlzIGNvcnJlY3QgYmVjYXVzZSBsb29raW5nIGF0IHRoZQo+ PiBpbXBsZW1lbnRhdGlvbiBvZiBwZm5fdG9fcGR4IGl0IGlzIGNlcnRhaW5seSBtZWFudCB0byBv cGVyYXRlIG9uIGEgcGZuCj4+IG1hc2tpbmcgYml0cyBvbiBpdCB0byBjb21wZW5zYXRlIGZvciB0 aGUgaG9sZXMuIEl0IGlzIG5vdCBtZWFudCB0byB3b3JrCj4+IG9uIGEgc2l6ZS4KPj4KPj4gSmFu LCBkb2VzIGl0IGxvb2sgY29ycmVjdCB0byB5b3UgdG9vPwo+IAo+IFllcy4gcGZuX3RvX3BkeCgp IGFuZCBmcmllbmRzIG1heSBvbmx5IGV2ZXIgYmUgcGFzc2VkIGFjdHVhbAo+IFBGTnMgLyBQRFhl cywgbm90IHNvbWV0aGluZyB0aGF0J3Mgb25lIGFib3ZlIG9yIG9uZSBiZWxvdyBhCj4gdmFsaWQg cmFuZ2UuIEkgc2hhcmUgSnVsaWVuJ3MgcXVlc3Rpb24gdGhvdWdoOiBXYXMgaXQgcmVhbGx5IG1l cmUKPiBsdWNrIHRoYXQgdGhpbmdzIGhhdmUgYmVlbiB3b3JraW5nIHRvIGRhdGU/CgpUTERSOyB1 bmV4cGxhaW5lZCB0byBub3Qgc2F5IG1lcmUgbHVjawoKV2UgZGVmaW5lIHRoZSBzaXplIG9mIHRo ZSBmcmFtZXRhYmxlIHVzaW5nOgoKbnJfcGR4cyA9IHBmbl90b19wZHgocGUgLSBwcyk7CmZyYW1l dGFibGVfc2l6ZSA9IG5yX3BkeHMgKiBzaXplb2YgKHN0cnVjdCBwYWdlX2luZm8pOwoKbWZuX3Rv X3BhZ2UgaXMgaW1wbGVtZW50ZWQgdGhlIGZvbGxvd2luZyB3YXk6CgpmcmFtZV90YWJsZSArICht Zm5fdG9fcGR4KG1mbikgLSBmcmFtZXRhYmxlX2Jhc2VfcGR4KQoKV2hlcmUgZnJhbWV0YWJsZV9i YXNlX3BkeCA9IHBmbl90b19wZHgocHMgPj4gUEFHRV9TSElGVCkKCk9uIHRoZSB0d28gcGxhdGZv cm1zIChKdW5vLXIyICsgRm91bmRhdGlvbiBNb2RlbCkgSSB0ZXN0ZWQgdG9kYXksIHNvbWVob3cK CnBmbl90b19wZHgocGUgLSBwcykgPT0gKHBmbl90b19wZHgoKHBlID4+IFBBR0VfU0hJRlQpIC0g MSkgKyAxKSAtIApmcmFtZXRhYmxlX2Jhc2VfcGR4KQoKU28gdGhlIGZyYW1ldGFibGUgaXMgY29y cmVjdGx5IHNpemVkIGJ1dCBJIGhvbmVzdGx5IEkgaGF2ZSBubyBpZGVhIHdoeSBpdCB3b3Jrcy4K CkFueXdheSwgSSBhbHNvIHRlc3RlZCB0aGUgY2hhbmdlIHN1Z2dlc3RlZCBieSBTdGVmYW5vLiBU aGlzIHdpbGwgc3Vic3RhbnRpYWxseSAKaW5jcmVhc2UgdGhlIHNpemUgb2YgdGhlIGZyYW1ldGFi bGUgb24gcGxhdGZvcm0gd2hlcmUgdGhlIFJBTSBkb2VzIG5vdCBzdGFydCBhdCAwLgoKRm9yIGlu c3RhbmNlLCBvbiBGb3VuZGF0aW9uIE1vZGVsIHRoZSBSQU0gc3RhcnRzIGF0IDJHQi4gQXMgd2Ug ZG9uJ3QgY29tcHJlc3MgCmFueSBvZiB0aGUgZmlyc3QgMzEgYml0cywgdGhlIGZyYW1ldGFibGUg d2lsbCBub3cgYmUgMjhNQiBiaWdnZXIgdGhhbiB3ZSAKY3VycmVudGx5IGhhdmUgKDExMk1CIHVw IGZyb20gODRNQikuCgpTbyBJIHRoaW5rIHdoYXQgd2Ugd2FudCBpczoKCm5yX3BkeHMgPSBwZm5f dG9fcGR4KGVuZCAtIDEpIC0gcGZuX3RvX3BkeChzdGFydCkgKyAxOwpmcmFtZV90YWJsZV9iYXNl X3BkeCA9IHBmbl90b19wZHgoc3RhcnQpOwoKT24gYSBzaWRlIG5vdGUsIEkgbm90aWNlZCB0aGF0 IHRoZSB0YWJsZSBpcyBzdGlsbCBtdWNoIGJpZ2dlciB0aGFuIGl0IHNob3VsZCBiZS4gCjRHQiBv ZiBSQU0gc2hvdWxkIG9ubHkgcmVxdWlyZSBhIGZyYW1ldGFibGUgb2YgNTZNQiwgYnV0IGl0IGlz IDg0TUIuIEFueXdheSwgCnRoYXQncyBwcm9iYWJseSBhIHNlcGFyYXRlIGRpc2N1c3Npb24uCgpD aGVlcnMsCgotLSAKSnVsaWVuIEdyYWxsCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54 ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGlu Zm8veGVuLWRldmVs 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,URIBL_BLOCKED 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 3C954C004C9 for ; Mon, 29 Apr 2019 15:54:59 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 154212063F for ; Mon, 29 Apr 2019 15:54:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 154212063F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hL8c5-0001tL-UT; Mon, 29 Apr 2019 15:54:41 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hL8c4-0001tB-8V for xen-devel@lists.xenproject.org; Mon, 29 Apr 2019 15:54:40 +0000 X-Inumbo-ID: 17e2037f-6a97-11e9-843c-bc764e045a96 Received: from foss.arm.com (unknown [217.140.101.70]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTP id 17e2037f-6a97-11e9-843c-bc764e045a96; Mon, 29 Apr 2019 15:54:38 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4F6C780D; Mon, 29 Apr 2019 08:54:38 -0700 (PDT) Received: from [10.1.196.50] (e108454-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 0D9963F5C1; Mon, 29 Apr 2019 08:54:36 -0700 (PDT) To: Jan Beulich , Stefano Stabellini References: <1556214715-22030-1-git-send-email-sstabellini@kernel.org> <981e7b3f-464b-d37c-e03e-22408ae65f85@arm.com> <5CC2CB8C02000078002295AA@prv1-mh.provo.novell.com> <5CC2D27C02000078002295F6@prv1-mh.provo.novell.com> <43510317-ca8a-ed23-835a-86a28286b919@arm.com> <5CC3283A0200007800229832@prv1-mh.provo.novell.com> <72a0eee1-1d29-2368-3737-d37f7a4926c6@arm.com> <5CC6A47E0200007800229D67@prv1-mh.provo.novell.com> From: Julien Grall Message-ID: <10687f88-fb6b-721c-c6e8-a1ab06023616@arm.com> Date: Mon, 29 Apr 2019 16:54:35 +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: <5CC6A47E0200007800229D67@prv1-mh.provo.novell.com> Content-Language: en-US Subject: Re: [Xen-devel] [PATCH] xen/arm: skip first page when RAM starts at 0x0 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: Andrew Cooper , Stefano Stabellini , nd@arm.com, 206497@studenti.unimore.it, xen-devel Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="UTF-8"; format="flowed" Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Message-ID: <20190429155435.qp5R06EJYolUCDqagcbar7xM-BbluGzx1lFKKtAWtks@z> SGksCgpPbiAyOS8wNC8yMDE5IDA4OjE1LCBKYW4gQmV1bGljaCB3cm90ZToKPj4+PiBPbiAyNy4w NC4xOSBhdCAwMTo0NywgPHNzdGFiZWxsaW5pQGtlcm5lbC5vcmc+IHdyb3RlOgo+PiBUaGUgb3Ro ZXIgY2hhbmdlIHRvIG5yX3BkeHMgaXMgbGVzcyBvYnZpb3VzLiBJdCBpcyBjbGVhciB0aGF0IG5y X3BkeHMgaXMKPj4gY2FsY3VsYXRlZCB3cm9uZ2x5IGluIHRoaXMgY2FzZSAobWVtb3J5IDAtMHg4 MDAwMDAwMCwKPj4gMHg4MDAwMDAwMDAtMHg4ODAwMDAwMDAsIHBzPTAsIHBlPTB4ODgwMDAwMDAw KTogbnJfcGR4cz01MjQyODggd2hpY2ggaXMKPj4gaGFsZiB0aGUgbnVtYmVyIHdlIG5lZWQgKHRo ZSBjb3JyZWN0IG51bWJlciBpcyAxMDQ4NTc1KS4KPj4KPj4gVGFraW5nIGEgbGluZSBmcm9tIHRo ZSB4ODYgY29kZSB4ZW4vYXJjaC94ODYvc2V0dXAuYzpzZXR1cF9tYXhfcGR4Cj4+IChKdWxpZW4n cyBzdWdnZXN0aW9uKToKPj4KPj4gICAgbWF4X3BkeCA9IHBmbl90b19wZHgodG9wX3BhZ2UgLSAx KSArIDE7Cj4+Cj4+IEkgY2hhbmdlZCBucl9wZHhzIHRvCj4+ICAgIAo+PiAgICBucl9wZHhzID0g cGZuX3RvX3BkeCgocGUgPj4gUEFHRV9TSElGVCkgLSAxKSArIDE7Cj4+Cj4+IGFuZCBpdCB3b3Jr cy4gSSB0aGluayB0aGUgY2hhbmdlIGlzIGNvcnJlY3QgYmVjYXVzZSBsb29raW5nIGF0IHRoZQo+ PiBpbXBsZW1lbnRhdGlvbiBvZiBwZm5fdG9fcGR4IGl0IGlzIGNlcnRhaW5seSBtZWFudCB0byBv cGVyYXRlIG9uIGEgcGZuCj4+IG1hc2tpbmcgYml0cyBvbiBpdCB0byBjb21wZW5zYXRlIGZvciB0 aGUgaG9sZXMuIEl0IGlzIG5vdCBtZWFudCB0byB3b3JrCj4+IG9uIGEgc2l6ZS4KPj4KPj4gSmFu LCBkb2VzIGl0IGxvb2sgY29ycmVjdCB0byB5b3UgdG9vPwo+IAo+IFllcy4gcGZuX3RvX3BkeCgp IGFuZCBmcmllbmRzIG1heSBvbmx5IGV2ZXIgYmUgcGFzc2VkIGFjdHVhbAo+IFBGTnMgLyBQRFhl cywgbm90IHNvbWV0aGluZyB0aGF0J3Mgb25lIGFib3ZlIG9yIG9uZSBiZWxvdyBhCj4gdmFsaWQg cmFuZ2UuIEkgc2hhcmUgSnVsaWVuJ3MgcXVlc3Rpb24gdGhvdWdoOiBXYXMgaXQgcmVhbGx5IG1l cmUKPiBsdWNrIHRoYXQgdGhpbmdzIGhhdmUgYmVlbiB3b3JraW5nIHRvIGRhdGU/CgpUTERSOyB1 bmV4cGxhaW5lZCB0byBub3Qgc2F5IG1lcmUgbHVjawoKV2UgZGVmaW5lIHRoZSBzaXplIG9mIHRo ZSBmcmFtZXRhYmxlIHVzaW5nOgoKbnJfcGR4cyA9IHBmbl90b19wZHgocGUgLSBwcyk7CmZyYW1l dGFibGVfc2l6ZSA9IG5yX3BkeHMgKiBzaXplb2YgKHN0cnVjdCBwYWdlX2luZm8pOwoKbWZuX3Rv X3BhZ2UgaXMgaW1wbGVtZW50ZWQgdGhlIGZvbGxvd2luZyB3YXk6CgpmcmFtZV90YWJsZSArICht Zm5fdG9fcGR4KG1mbikgLSBmcmFtZXRhYmxlX2Jhc2VfcGR4KQoKV2hlcmUgZnJhbWV0YWJsZV9i YXNlX3BkeCA9IHBmbl90b19wZHgocHMgPj4gUEFHRV9TSElGVCkKCk9uIHRoZSB0d28gcGxhdGZv cm1zIChKdW5vLXIyICsgRm91bmRhdGlvbiBNb2RlbCkgSSB0ZXN0ZWQgdG9kYXksIHNvbWVob3cK CnBmbl90b19wZHgocGUgLSBwcykgPT0gKHBmbl90b19wZHgoKHBlID4+IFBBR0VfU0hJRlQpIC0g MSkgKyAxKSAtIApmcmFtZXRhYmxlX2Jhc2VfcGR4KQoKU28gdGhlIGZyYW1ldGFibGUgaXMgY29y cmVjdGx5IHNpemVkIGJ1dCBJIGhvbmVzdGx5IEkgaGF2ZSBubyBpZGVhIHdoeSBpdCB3b3Jrcy4K CkFueXdheSwgSSBhbHNvIHRlc3RlZCB0aGUgY2hhbmdlIHN1Z2dlc3RlZCBieSBTdGVmYW5vLiBU aGlzIHdpbGwgc3Vic3RhbnRpYWxseSAKaW5jcmVhc2UgdGhlIHNpemUgb2YgdGhlIGZyYW1ldGFi bGUgb24gcGxhdGZvcm0gd2hlcmUgdGhlIFJBTSBkb2VzIG5vdCBzdGFydCBhdCAwLgoKRm9yIGlu c3RhbmNlLCBvbiBGb3VuZGF0aW9uIE1vZGVsIHRoZSBSQU0gc3RhcnRzIGF0IDJHQi4gQXMgd2Ug ZG9uJ3QgY29tcHJlc3MgCmFueSBvZiB0aGUgZmlyc3QgMzEgYml0cywgdGhlIGZyYW1ldGFibGUg d2lsbCBub3cgYmUgMjhNQiBiaWdnZXIgdGhhbiB3ZSAKY3VycmVudGx5IGhhdmUgKDExMk1CIHVw IGZyb20gODRNQikuCgpTbyBJIHRoaW5rIHdoYXQgd2Ugd2FudCBpczoKCm5yX3BkeHMgPSBwZm5f dG9fcGR4KGVuZCAtIDEpIC0gcGZuX3RvX3BkeChzdGFydCkgKyAxOwpmcmFtZV90YWJsZV9iYXNl X3BkeCA9IHBmbl90b19wZHgoc3RhcnQpOwoKT24gYSBzaWRlIG5vdGUsIEkgbm90aWNlZCB0aGF0 IHRoZSB0YWJsZSBpcyBzdGlsbCBtdWNoIGJpZ2dlciB0aGFuIGl0IHNob3VsZCBiZS4gCjRHQiBv ZiBSQU0gc2hvdWxkIG9ubHkgcmVxdWlyZSBhIGZyYW1ldGFibGUgb2YgNTZNQiwgYnV0IGl0IGlz IDg0TUIuIEFueXdheSwgCnRoYXQncyBwcm9iYWJseSBhIHNlcGFyYXRlIGRpc2N1c3Npb24uCgpD aGVlcnMsCgotLSAKSnVsaWVuIEdyYWxsCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54 ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGlu Zm8veGVuLWRldmVs