From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Grall Subject: Re: [PATCH v10 01/32] ARM: vGIC: avoid rank lock when reading priority Date: Wed, 31 May 2017 11:42:30 +0100 Message-ID: <7eb9f658-0e5d-eb9d-731f-1febff338c8c@arm.com> References: <20170526173540.10066-1-andre.przywara@arm.com> <20170526173540.10066-2-andre.przywara@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: Received: from mail6.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dG15I-0004U7-CU for xen-devel@lists.xenproject.org; Wed, 31 May 2017 10:42:36 +0000 In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Stefano Stabellini Cc: Andre Przywara , Vijaya Kumar K , Vijay Kilari , Shanker Donthineni , xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org SGkgU3RlZmFubywKCk9uIDMwLzA1LzE3IDIyOjM5LCBTdGVmYW5vIFN0YWJlbGxpbmkgd3JvdGU6 Cj4gT24gVHVlLCAzMCBNYXkgMjAxNywgSnVsaWVuIEdyYWxsIHdyb3RlOgo+PiBIaSBBbmRyZSwK Pj4KPj4gT24gMjYvMDUvMTcgMTg6MzUsIEFuZHJlIFByenl3YXJhIHdyb3RlOgo+Pj4gV2hlbiBy ZWFkaW5nIHRoZSBwcmlvcml0eSB2YWx1ZSBvZiBhIHZpcnR1YWwgaW50ZXJydXB0LCB3ZSB3ZXJl IHRha2luZwo+Pj4gdGhlIHJlc3BlY3RpdmUgcmFuayBsb2NrIHNvIGZhci4KPj4+IEhvd2V2ZXIg Zm9yIGZvcndhcmRlZCBpbnRlcnJ1cHRzIChEb20wIG9ubHkgc28gZmFyKSB0aGlzIG1heSBsZWFk IHRvIGEKPj4+IGRlYWRsb2NrIHdpdGggdGhlIGZvbGxvd2luZyBjYWxsIGNoYWluOgo+Pj4gLSBN TUlPIGFjY2VzcyB0byBjaGFuZ2UgdGhlIElSUSBhZmZpbml0eSwgY2FsbGluZyB0aGUgSVRBUkdF VFNSIGhhbmRsZXIKPj4+IC0gdGhpcyBoYW5kbGVyIHRha2VzIHRoZSBhcHByb3ByaWF0ZSByYW5r IGxvY2sgYW5kIGNhbGxzCj4+PiB2Z2ljX3N0b3JlX2l0YXJnZXRzcigpCj4+PiAtIHZnaWNfc3Rv cmVfaXRhcmdldHNyKCkgd2lsbCBldmVudHVhbGx5IGNhbGwgdmdpY19taWdyYXRlX2lycSgpCj4+ PiAtIGlmIHRoaXMgSVJRIGlzIGFscmVhZHkgaW4tZmxpZ2h0LCBpdCB3aWxsIHJlbW92ZSBpdCBm cm9tIHRoZSBvbGQKPj4+ICAgVkNQVSBhbmQgaW5qZWN0IGl0IGludG8gdGhlIG5ldyBvbmUsIGJ5 IGNhbGxpbmcgdmdpY192Y3B1X2luamVjdF9pcnEoKQo+Pj4gLSB2Z2ljX3ZjcHVfaW5qZWN0X2ly cSB3aWxsIGNhbGwgdmdpY19nZXRfdmlycV9wcmlvcml0eSgpCj4+PiAtIHZnaWNfZ2V0X3ZpcnFf cHJpb3JpdHkoKSB0cmllcyB0byB0YWtlIHRoZSByYW5rIGxvY2sgLSBhZ2FpbiEKPj4+IEl0IHNl ZW1zIGxpa2UgdGhpcyBjb2RlIHBhdGggaGFzIG5ldmVyIGJlZW4gZXhlcmNpc2VkIGJlZm9yZS4K Pj4+Cj4+PiBGaXggdGhpcyBieSBhdm9pZGluZyB0YWtpbmcgdGhlIGxvY2sgaW4gdmdpY19nZXRf dmlycV9wcmlvcml0eSgpIChsaWtlIHdlCj4+PiBkbyBpbiB2Z2ljX2dldF90YXJnZXRfdmNwdSgp KS4KPj4+IEFjdHVhbGx5IHdlIGFyZSBqdXN0IHJlYWRpbmcgb25lIGJ5dGUsIGFuZCBwcmlvcml0 eSBjaGFuZ2VzIHdoaWxlCj4+PiBpbnRlcnJ1cHRzIGFyZSBoYW5kbGVkIGFyZSBhIGJlbmlnbiBy YWNlIHRoYXQgY2FuIGhhcHBlbiBvbiByZWFsIGhhcmR3YXJlCj4+PiB0b28uIFNvIGl0IGxvb2tz IHNhZmUgdG8ganVzdCB1c2UgcmVhZF9hdG9taWMoKSBpbnN0ZWFkLgo+Pj4KPj4+IFNpZ25lZC1v ZmYtYnk6IEFuZHJlIFByenl3YXJhIDxhbmRyZS5wcnp5d2FyYUBhcm0uY29tPgo+Pj4gLS0tCj4+ PiAgeGVuL2FyY2gvYXJtL3ZnaWMuYyB8IDggKy0tLS0tLS0KPj4+ICAxIGZpbGUgY2hhbmdlZCwg MSBpbnNlcnRpb24oKyksIDcgZGVsZXRpb25zKC0pCj4+Pgo+Pj4gZGlmZiAtLWdpdCBhL3hlbi9h cmNoL2FybS92Z2ljLmMgYi94ZW4vYXJjaC9hcm0vdmdpYy5jCj4+PiBpbmRleCA4MzU2OWIwLi41 NGIyYWFkIDEwMDY0NAo+Pj4gLS0tIGEveGVuL2FyY2gvYXJtL3ZnaWMuYwo+Pj4gKysrIGIveGVu L2FyY2gvYXJtL3ZnaWMuYwo+Pj4gQEAgLTIyNywxNCArMjI3LDggQEAgc3RydWN0IHZjcHUgKnZn aWNfZ2V0X3RhcmdldF92Y3B1KHN0cnVjdCB2Y3B1ICp2LAo+Pj4gdW5zaWduZWQgaW50IHZpcnEp Cj4+PiAgc3RhdGljIGludCB2Z2ljX2dldF92aXJxX3ByaW9yaXR5KHN0cnVjdCB2Y3B1ICp2LCB1 bnNpZ25lZCBpbnQgdmlycSkKPj4+ICB7Cj4+PiAgICAgIHN0cnVjdCB2Z2ljX2lycV9yYW5rICpy YW5rID0gdmdpY19yYW5rX2lycSh2LCB2aXJxKTsKPj4+IC0gICAgdW5zaWduZWQgbG9uZyBmbGFn czsKPj4+IC0gICAgaW50IHByaW9yaXR5Owo+Pj4gLQo+Pj4gLSAgICB2Z2ljX2xvY2tfcmFuayh2 LCByYW5rLCBmbGFncyk7Cj4+PiAtICAgIHByaW9yaXR5ID0gcmFuay0+cHJpb3JpdHlbdmlycSAm IElOVEVSUlVQVF9SQU5LX01BU0tdOwo+Pj4gLSAgICB2Z2ljX3VubG9ja19yYW5rKHYsIHJhbmss IGZsYWdzKTsKPj4+Cj4+PiAtICAgIHJldHVybiBwcmlvcml0eTsKPj4+ICsgICAgcmV0dXJuIHJl YWRfYXRvbWljKCZyYW5rLT5wcmlvcml0eVt2aXJxICYgSU5URVJSVVBUX1JBTktfTUFTS10pOwo+ Pgo+PiBUaGUgd3JpdGUgaW4gcmFuay0+cHJpb3JpdHkgd2lsbCBub3QgYmUgYXRvbWljIChzZWUg dmdpY19yZWdfdXBkYXRlCj4+IGltcGxlbWVudGF0aW9uKTogdGhlIHJlZ2lzdGVyIGlzIGZpcnN0 IG1hc2tlZCwgdGhlIHRoZSBwcmlvcml0eSBzZXQuCj4+Cj4+IFNvIHlvdSBtYXkgZW5kIHVwIHRv IHJlYWQgMCAod2hpY2ggaXMgdGhlIGhpZ2hlciBwcmlvcml0eSkgYnkgbWlzdGFrZS4KPj4KPj4g V2Ugc2hvdWxkIHByb2JhYmx5IHRoaW5rIHRvIG1ha2UgdmdpY19yZWdfKiBoZWxwZXIgYXRvbWlj Lgo+Cj4gUmlnaHQhIFRoYXQncyB3aHkgSSB3cm90ZQo+IGFscGluZS5ERUIuMi4xMC4xNzA1MjMx MTM1MTMwLjE4NzU5QHNzdGFiZWxsaW5pLVRoaW5rUGFkLVgyNjAKCkl0IHdhcyBub3Qgb2J2aW91 cyBmcm9tIHRoaXMgZS1tYWlsIHdoeSB5b3Ugd2FudGVkIHRoaXMuIEl0IGxvb2tlZCBtb3JlIAph IHJlcXVlc3QgZm9yIGltcHJvdmVtZW50IHJhdGhlciB0aGFuIGEgcG90ZW50aWFsIGJ1Zy4gSGVu Y2UgbXkgCnN1Z2dlc3Rpb24gdG8gZGVsYXkgaXQuCgpDaGVlcnMsCgotLSAKSnVsaWVuIEdyYWxs CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2 ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW4ub3JnCmh0dHBzOi8vbGlzdHMueGVu Lm9yZy94ZW4tZGV2ZWwK