From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH v3 07/13] xen/arm: Simplify alternative
 patching of non-writable region
Date: Fri, 22 Jun 2018 09:33:22 -0400
Message-ID: <20180622133322.GG10869@char.US.ORACLE.com>
References: <20180612113643.32020-1-julien.grall@arm.com>
 <20180612113643.32020-8-julien.grall@arm.com>
 <20180612211759.GC17709@char.us.oracle.com>
 <c314f376-30a3-ed7f-a696-4adda2502891@arm.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xenproject.org>
Received: from all-amaz-eas1.inumbo.com ([34.197.232.57])
 by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from
 <srs0=7xke=ji=oracle.com=konrad.wilk@srs-us1.protection.inumbo.net>)
 id 1fWMBv-0000ag-T2
 for xen-devel@lists.xenproject.org; Fri, 22 Jun 2018 13:33:31 +0000
Content-Disposition: inline
In-Reply-To: <c314f376-30a3-ed7f-a696-4adda2502891@arm.com>
List-Unsubscribe: <https://lists.xenproject.org/mailman/options/xen-devel>,
 <mailto:xen-devel-request@lists.xenproject.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xenproject.org>
List-Help: <mailto:xen-devel-request@lists.xenproject.org?subject=help>
List-Subscribe: <https://lists.xenproject.org/mailman/listinfo/xen-devel>,
 <mailto:xen-devel-request@lists.xenproject.org?subject=subscribe>
Errors-To: xen-devel-bounces@lists.xenproject.org
Sender: "Xen-devel" <xen-devel-bounces@lists.xenproject.org>
To: Julien Grall <julien.grall@arm.com>
Cc: xen-devel@lists.xenproject.org, nd@arm.com, sstabellini@kernel.org, andre.przywara@arm.com
List-Id: xen-devel@lists.xenproject.org

T24gVHVlLCBKdW4gMTIsIDIwMTggYXQgMTE6MDY6MTZQTSArMDEwMCwgSnVsaWVuIEdyYWxsIHdy
b3RlOgo+IEhpIEtvbnJhZCwKPiAKPiBPbiAxMi8wNi8yMDE4IDIyOjE3LCBLb25yYWQgUnplc3p1
dGVrIFdpbGsgd3JvdGU6Cj4gPiBPbiBUdWUsIEp1biAxMiwgMjAxOCBhdCAxMjozNjozN1BNICsw
MTAwLCBKdWxpZW4gR3JhbGwgd3JvdGU6Cj4gPiA+IER1cmluZyB0aGUgTU1VIHNldHVwIHByb2Nl
c3MsIFhlbiB3aWxsIHNldCBTQ1RMUl9FTDIuV05YCj4gPiA+IChXcml0ZS1Ob24tZVhlY3V0YWJs
ZSkgYml0LiBCZWNhdXNlIG9mIHRoYXQsIHRoZSBhbHRlcm5hdGl2ZSBjb2RlIG5lZWQKPiA+ID4g
dG8gcmUtbWFwcGVkIHRoZSByZWdpb24gaW4gYSBkaWZmZXJlbmNlIHBsYWNlIGluIG9yZGVyIHRv
IG1vZGlmeSB0aGUKPiA+ID4gdGV4dCBzZWN0aW9uLgo+ID4gPiAKPiA+ID4gQXQgdGhlIG1vbWVu
dCwgdGhlIGZ1bmN0aW9uIHBhdGNoaW5nIHRoZSBjb2RlIGlzIG9ubHkgYXdhcmUgb2YgdGhlCj4g
PiA+IHJlLW1hcHBlZCByZWdpb24uIFRoaXMgcmVxdWlyZXMgdGhlIGNhbGxlciB0byBtZXNzIHdp
dGggWGVuIGludGVybmFsIGluCj4gPiA+IG9yZGVyIHRvIGhhdmUgZnVuY3Rpb24gc3VjaCBhcyBp
c19hY3RpdmVfa2VybmVsX3RleHQoKSB3b3JraW5nLgo+ID4gPiAKPiA+ID4gQWxsIHRoZSBpbnRl
cmFjdGlvbnMgd2l0aCBYZW4gaW50ZXJuYWwgY2FuIGJlIHJlbW92ZWQgYnkgc3BlY2lmeWluZyB0
aGUKPiA+ID4gb2Zmc2V0IGJldHdlZW4gdGhlIHJlZ2lvbiBwYXRjaCBhbmQgdGhlIHdyaXRhYmxl
IHJlZ2lvbiBmb3IgdXBkYXRpbmcgdGhlCj4gPiA+IGluc3RydWN0aW9uCj4gPiA+IAo+ID4gPiBU
aGlzIHNpbXBsaWZpY2F0aW9uIHdpbGwgYWxzbyBtYWtlIGl0IGVhc2llciB0byBpbnRlZ3JhdGUg
ZHluYW1pYyBwYXRjaGluZwo+ID4gPiBpbiBhIGZvbGxvdy11cCBwYXRjaC4gSW5kZWVkLCB0aGUg
Y2FsbGJhY2sgYWRkcmVzcyBzaG91bGQgYmUgaW4KPiA+ID4gYW4gb3JpZ2luYWwgcmVnaW9uIGFu
ZCBub3QgcmUtbWFwcGVkIG9ubHkgd2hpY2ggaXMgd3JpdGVhYmxlIG5vbi1leGVjdXRhYmxlLgo+
ID4gPiAKPiA+ID4gVGhpcyBpcyBwYXJ0IG9mIFhTQS0yNjMuCj4gPiA+IAo+ID4gPiBTaWduZWQt
b2ZmLWJ5OiBKdWxpZW4gR3JhbGwgPGp1bGllbi5ncmFsbEBhcm0uY29tPgo+ID4gPiBSZXZpZXdl
ZC1ieTogU3RlZmFubyBTdGFiZWxsaW5pIDxzc3RhYmVsbGluaUBrZXJuZWwub3JnPgo+ID4gPiAK
PiA+ID4gLS0tCj4gPiA+IAo+ID4gPiBDYzogS29ucmFkIFJ6ZXN6dXRlayBXaWxrIDxrb25yYWQu
d2lsa0BvcmFjbGUuY29tPgo+ID4gPiAKPiA+ID4gICAgICBDaGFuZ2VzIGluIHYzOgo+ID4gPiAg
ICAgICAgICAtIEFkZCBzdGVmYW5vJ3MgcmV2aWV3ZWQtYnkKPiA+ID4gCj4gPiA+ICAgICAgQ2hh
bmdlcyBpbiB2MjoKPiA+ID4gICAgICAgICAgLSBBZGQgY29tbWl0IG1lc3NhZ2UKPiA+ID4gICAg
ICAgICAgLSBSZW1vdmUgY29tbWVudCBpbiB0aGUgY29kZSB0aGF0IGRvZXMgbm90IG1ha2Ugc2Vu
c2UgYW55bW9yZQo+ID4gPiAtLS0KPiA+ID4gICB4ZW4vYXJjaC9hcm0vYWx0ZXJuYXRpdmUuYyB8
IDQyICsrKysrKysrKysrKystLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQo+ID4gPiAgIDEg
ZmlsZSBjaGFuZ2VkLCAxMyBpbnNlcnRpb25zKCspLCAyOSBkZWxldGlvbnMoLSkKPiA+ID4gCj4g
PiA+IGRpZmYgLS1naXQgYS94ZW4vYXJjaC9hcm0vYWx0ZXJuYXRpdmUuYyBiL3hlbi9hcmNoL2Fy
bS9hbHRlcm5hdGl2ZS5jCj4gPiA+IGluZGV4IDlmZmRjNDc1ZDYuLjkzNmNmMDQ5NTYgMTAwNjQ0
Cj4gPiA+IC0tLSBhL3hlbi9hcmNoL2FybS9hbHRlcm5hdGl2ZS5jCj4gPiA+ICsrKyBiL3hlbi9h
cmNoL2FybS9hbHRlcm5hdGl2ZS5jCj4gPiA+IEBAIC05NywxMiArOTcsMTYgQEAgc3RhdGljIHUz
MiBnZXRfYWx0X2luc24oY29uc3Qgc3RydWN0IGFsdF9pbnN0ciAqYWx0LAo+ID4gPiAgIC8qCj4g
PiA+ICAgICogVGhlIHJlZ2lvbiBwYXRjaGVkIHNob3VsZCBiZSByZWFkLXdyaXRlIHRvIGFsbG93
IF9fYXBwbHlfYWx0ZXJuYXRpdmVzCj4gPiA+ICAgICogdG8gcmVwbGFjaW5nIHRoZSBpbnN0cnVj
dGlvbnMgd2hlbiBuZWNlc3NhcnkuCj4gPiA+ICsgKgo+ID4gPiArICogQHVwZGF0ZV9vZmZzZXQ6
IE9mZnNldCBiZXR3ZWVuIHRoZSByZWdpb24gcGF0Y2hlZCBhbmQgdGhlIHdyaXRhYmxlCj4gPiA+
ICsgKiByZWdpb24gZm9yIHRoZSB1cGRhdGUuIDAgaWYgdGhlIHBhdGNoZWQgcmVnaW9uIGlzIHdy
aXRhYmxlLgo+ID4gPiAgICAqLwo+ID4gPiAtc3RhdGljIGludCBfX2FwcGx5X2FsdGVybmF0aXZl
cyhjb25zdCBzdHJ1Y3QgYWx0X3JlZ2lvbiAqcmVnaW9uKQo+ID4gPiArc3RhdGljIGludCBfX2Fw
cGx5X2FsdGVybmF0aXZlcyhjb25zdCBzdHJ1Y3QgYWx0X3JlZ2lvbiAqcmVnaW9uLAo+ID4gPiAr
ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICBwYWRkcl90IHVwZGF0ZV9vZmZzZXQpCj4g
PiA+ICAgewo+ID4gPiAgICAgICBjb25zdCBzdHJ1Y3QgYWx0X2luc3RyICphbHQ7Cj4gPiA+IC0g
ICAgY29uc3QgdTMyICpyZXBscHRyOwo+ID4gPiAtICAgIHUzMiAqb3JpZ3B0cjsKPiA+ID4gKyAg
ICBjb25zdCB1MzIgKnJlcGxwdHIsICpvcmlncHRyOwo+ID4gPiArICAgIHUzMiAqdXBkcHRyOwo+
ID4gPiAgICAgICBwcmludGsoWEVOTE9HX0lORk8gImFsdGVybmF0aXZlczogUGF0Y2hpbmcgd2l0
aCBhbHQgdGFibGUgJXAgLT4gJXBcbiIsCj4gPiA+ICAgICAgICAgICAgICByZWdpb24tPmJlZ2lu
LCByZWdpb24tPmVuZCk7Cj4gPiA+IEBAIC0xMTgsNiArMTIyLDcgQEAgc3RhdGljIGludCBfX2Fw
cGx5X2FsdGVybmF0aXZlcyhjb25zdCBzdHJ1Y3QgYWx0X3JlZ2lvbiAqcmVnaW9uKQo+ID4gPiAg
ICAgICAgICAgQlVHX09OKGFsdC0+YWx0X2xlbiAhPSBhbHQtPm9yaWdfbGVuKTsKPiA+ID4gICAg
ICAgICAgIG9yaWdwdHIgPSBBTFRfT1JJR19QVFIoYWx0KTsKPiA+ID4gKyAgICAgICAgdXBkcHRy
ID0gKHZvaWQgKilvcmlncHRyICsgdXBkYXRlX29mZnNldDsKPiA+ID4gICAgICAgICAgIHJlcGxw
dHIgPSBBTFRfUkVQTF9QVFIoYWx0KTsKPiA+ID4gICAgICAgICAgIG5yX2luc3QgPSBhbHQtPmFs
dF9sZW4gLyBzaXplb2YoaW5zbik7Cj4gPiA+IEBAIC0xMjUsNyArMTMwLDcgQEAgc3RhdGljIGlu
dCBfX2FwcGx5X2FsdGVybmF0aXZlcyhjb25zdCBzdHJ1Y3QgYWx0X3JlZ2lvbiAqcmVnaW9uKQo+
ID4gPiAgICAgICAgICAgZm9yICggaSA9IDA7IGkgPCBucl9pbnN0OyBpKysgKQo+ID4gPiAgICAg
ICAgICAgewo+ID4gPiAgICAgICAgICAgICAgIGluc24gPSBnZXRfYWx0X2luc24oYWx0LCBvcmln
cHRyICsgaSwgcmVwbHB0ciArIGkpOwo+ID4gPiAtICAgICAgICAgICAgKihvcmlncHRyICsgaSkg
PSBjcHVfdG9fbGUzMihpbnNuKTsKPiA+ID4gKyAgICAgICAgICAgICoodXBkcHRyICsgaSkgPSBj
cHVfdG9fbGUzMihpbnNuKTsKPiA+ID4gICAgICAgICAgIH0KPiA+ID4gICAgICAgICAgIC8qIEVu
c3VyZSB0aGUgbmV3IGluc3RydWN0aW9ucyByZWFjaGVkIHRoZSBtZW1vcnkgYW5kIG51a2UgKi8K
PiA+ID4gQEAgLTE2Miw5ICsxNjcsNiBAQCBzdGF0aWMgaW50IF9fYXBwbHlfYWx0ZXJuYXRpdmVz
X211bHRpX3N0b3Aodm9pZCAqdW51c2VkKQo+ID4gPiAgICAgICAgICAgcGFkZHJfdCB4ZW5fc2l6
ZSA9IF9lbmQgLSBfc3RhcnQ7Cj4gPiA+ICAgICAgICAgICB1bnNpZ25lZCBpbnQgeGVuX29yZGVy
ID0gZ2V0X29yZGVyX2Zyb21fYnl0ZXMoeGVuX3NpemUpOwo+ID4gPiAgICAgICAgICAgdm9pZCAq
eGVubWFwOwo+ID4gPiAtICAgICAgICBzdHJ1Y3QgdmlydHVhbF9yZWdpb24gcGF0Y2hfcmVnaW9u
ID0gewo+ID4gPiAtICAgICAgICAgICAgLmxpc3QgPSBMSVNUX0hFQURfSU5JVChwYXRjaF9yZWdp
b24ubGlzdCksCj4gPiA+IC0gICAgICAgIH07Cj4gPiA+ICAgICAgICAgICBCVUdfT04ocGF0Y2hl
ZCk7Cj4gPiA+IEBAIC0xNzcsMzEgKzE3OSwxMyBAQCBzdGF0aWMgaW50IF9fYXBwbHlfYWx0ZXJu
YXRpdmVzX211bHRpX3N0b3Aodm9pZCAqdW51c2VkKQo+ID4gPiAgICAgICAgICAgLyogUmUtbWFw
cGluZyBYZW4gaXMgbm90IGV4cGVjdGVkIHRvIGZhaWwgZHVyaW5nIGJvb3QuICovCj4gPiA+ICAg
ICAgICAgICBCVUdfT04oIXhlbm1hcCk7Cj4gPiA+IC0gICAgICAgIC8qCj4gPiA+IC0gICAgICAg
ICAqIElmIHdlIGdlbmVyYXRlIGEgbmV3IGJyYW5jaCBpbnN0cnVjdGlvbiwgdGhlIHRhcmdldCB3
aWxsIGJlCj4gPiA+IC0gICAgICAgICAqIGNhbGN1bGF0ZWQgaW4gdGhpcyByZS1tYXBwZWQgWGVu
IHJlZ2lvbi4gU28gd2UgaGF2ZSB0byByZWdpc3Rlcgo+ID4gPiAtICAgICAgICAgKiB0aGlzIHJl
LW1hcHBlZCBYZW4gcmVnaW9uIGFzIGEgdmlydHVhbCByZWdpb24gdGVtcG9yYXJpbHkuCj4gPiAK
PiA+IFdoYXQgYWJvdXQgdGhpcz8KPiA+IAo+ID4gV29uJ3QgdGhpcyBtZWFuIHRoZSB0cmFwcyAo
aWYgdGhlcmUgYXJlIGFueSkgd29uJ3QgYmUgcmVjb2duaXplZCBhdCBhbGwKPiA+IGR1cmluZyB0
aGlzIHBhdGNoaW5nPwo+IAo+IFdoYXQgZG8geW91IG1lYW4gYnkgcmVjb2duaXplZD8gVGhpcyBu
ZXcgcmVnaW9uIHdpbGwgb25seSBiZSBhY2Nlc3NlZCB0bwo+IHdyaXRlIGluc3RydWN0aW9uLiBU
aGUgb25seSBwb3RlbnRpYWwgZmF1bHQgb24gdGhhdCByZWdpb24gaXMgYSBkYXRhIGFib3J0LgoK
RXhhY3RseSB0aGUgZGF0YSBhYm9ydC4KCk15IHJlY29sbGVjdGlvbiBpcyB0aGF0IHRoZSBkYXRh
IGFib3J0IHdvdWxkIHByaW50IGEgc3RhY2sgdHJhY2UuIEFuZCAKdGhlIHN0YWNrIHRyYWNlIG5l
ZWRzIHN5bWJvbCBpbmZvcm1hdGlvbiAtIHdoaWNoIGl0IGdldHMgZnJvbSB2aXJ0dWFsX3JlZ2lv
bi4KCkJ1dCBpZiB2aXJ0dWFsX3JlZ2lvbiBpcyBub3QgcmVnaXN0ZXJlZCB0aGVuIHRoZSBzdGFj
ayB3b24ndCBjb250YWluIHRoZQpuYW1lIG9mIHRoZSBmdW5jdGlvbiB0aGF0IGhhZCBhbiBkYXRh
IGFib3J0IGFzIHRoZSBwYXRjaGluZyBpcyBkb25lLgoKX19fX19fX19fX19fX19fX19fX19fX19f
X19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVsIG1haWxpbmcgbGlzdApYZW4tZGV2ZWxA
bGlzdHMueGVucHJvamVjdC5vcmcKaHR0cHM6Ly9saXN0cy54ZW5wcm9qZWN0Lm9yZy9tYWlsbWFu
L2xpc3RpbmZvL3hlbi1kZXZlbA==