From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex =?utf-8?Q?Benn=C3=A9e?= Subject: Re: [RFC PATCH 09/16] KVM: arm64: Allow ID registers to by dynamically read-as-zero Date: Wed, 25 Jul 2018 16:46:55 +0100 Message-ID: <876013tj0w.fsf@linaro.org> References: <1529593060-542-1-git-send-email-Dave.Martin@arm.com> <1529593060-542-10-git-send-email-Dave.Martin@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id C2BDE4A0F6 for ; Wed, 25 Jul 2018 11:46:58 -0400 (EDT) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3z0PNnKqq8u8 for ; Wed, 25 Jul 2018 11:46:58 -0400 (EDT) Received: from mail-wr1-f65.google.com (mail-wr1-f65.google.com [209.85.221.65]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id C7B4040A50 for ; Wed, 25 Jul 2018 11:46:57 -0400 (EDT) Received: by mail-wr1-f65.google.com with SMTP id v14-v6so7900172wro.5 for ; Wed, 25 Jul 2018 08:46:57 -0700 (PDT) In-reply-to: <1529593060-542-10-git-send-email-Dave.Martin@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: Dave Martin Cc: Okamoto Takayuki , Christoffer Dall , Ard Biesheuvel , Marc Zyngier , Catalin Marinas , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org List-Id: kvmarm@lists.cs.columbia.edu CkRhdmUgTWFydGluIDxEYXZlLk1hcnRpbkBhcm0uY29tPiB3cml0ZXM6Cgo+IFdoZW4gYSBmZWF0 dXJlLWRlcGVuZGVudCBJRCByZWdpc3RlciBpcyBoaWRkZW4gZnJvbSB0aGUgZ3Vlc3QsIGl0Cj4g bmVlZHMgdG8gZXhoaWJpdCByZWFkLWFzLXplcm8gYmVoYXZpb3VyIGFzIGRlZmluZWQgYnkgdGhl IEFybQo+IGFyY2hpdGVjdHVyZSwgcmF0aGVyIHRoYW4gYXBwZWFyaW5nIHRvIGJlIGVudGlyZWx5 IGFic2VudC4KPgo+IFRoaXMgcGF0Y2ggdXBkYXRlcyB0aGUgSUQgcmVnaXN0ZXIgZW11bGF0aW9u IGxvZ2ljIHRvIG1ha2UgdXNlIG9mCj4gdGhlIG5ldyBjaGVja19wcmVzZW50KCkgbWV0aG9kIHRv IGRldGVybWluZSB3aGV0aGVyIHRoZSByZWdpc3Rlcgo+IHNob3VsZCByZWFkIGFzIHplcm8gaW5z dGVhZCBvZiB5aWVsZGluZyB0aGUgaG9zdCdzIHNhbml0aXNlZAo+IHZhbHVlLiAgQmVjYXVzZSBj dXJyZW50bHkgYSBmYWxzZSByZXN1bHQgZnJvbSB0aGlzIG1ldGhvZCB0cnVuY2F0ZXMKPiB0aGUg dHJhcCBjYWxsIGNoYWluIGJlZm9yZSB0aGUgc3lzcmVnJ3MgZW11bGF0ZSBtZXRob2QoKSBpcyBj YWxsZWQsCj4gYSBmbGFnIGlzIGFkZGVkIHRvIGRpc3Rpbmd1aXNoIHRoaXMgc3BlY2lhbCBjYXNl LCBhbmQgaGVscGVycyBhcmUKPiByZWZhY3RvcmVkIGFwcHJvcHJpYXRlbHkuCj4KPiBUaGlzIGlu dmxvdmVzIHNvbWUgdHJpdmlhbCB1cGRhdGVzIHRvIHBhc3MgdGhlIHZjcHUgcG9pbnRlciBkb3du Cj4gaW50byB0aGUgSUQgcmVnaXN0ZXIgZW11bGF0aW9uL2FjY2VzcyBmdW5jdGlvbnMuCj4KPiBB IG5ldyBJRF9TQU5JVElTRURfSUYoKSBtYWNybyBpcyBkZWZpbmVkIGZvciBkZWNsYXJpbmcKPiBj b25kaXRpb25hbGx5IHZpc2libGUgSUQgcmVnaXN0ZXJzLgo+Cj4gU2lnbmVkLW9mZi1ieTogRGF2 ZSBNYXJ0aW4gPERhdmUuTWFydGluQGFybS5jb20+Cj4gLS0tCjxzbmlwPgo+IEBAIC0yMzM3LDcg KzIzNTIsNyBAQCBpbnQga3ZtX2FybV9zeXNfcmVnX3NldF9yZWcoc3RydWN0IGt2bV92Y3B1ICp2 Y3B1LCBjb25zdCBzdHJ1Y3Qga3ZtX29uZV9yZWcgKnJlZwo+ICAJaWYgKCFyKQo+ICAJCXJldHVy biBzZXRfaW52YXJpYW50X3N5c19yZWcocmVnLT5pZCwgdWFkZHIpOwo+Cj4gLQlpZiAoIXN5c19y ZWdfcHJlc2VudCh2Y3B1LCByKSkKPiArCWlmICghc3lzX3JlZ19wcmVzZW50X29yX3Jheih2Y3B1 LCByKSkKPiAgCQlyZXR1cm4gLUVOT0VOVDsKCkl0J3MgYWxsIHZlcnkgd2VsbCBiZWluZyByYXos IGJ1dCBzaG91bGRuJ3QgeW91IGNhdGNoIHRoaXMgZnVydGhlciBkb3duCmFuZCBub3QgYXR0ZW1w dCB0byB3cml0ZSB0aGUgcmVnaXN0ZXIgdGhhdCBkb2Vzbid0IGV4aXN0PwoKPgo+ICAJaWYgKHIt PnNldF91c2VyKQo+IEBAIC0yNDA4LDcgKzI0MjMsNyBAQCBzdGF0aWMgaW50IHdhbGtfb25lX3N5 c19yZWcoc3RydWN0IGt2bV92Y3B1ICp2Y3B1LAo+ICAJaWYgKCEocmQtPnJlZyB8fCByZC0+Z2V0 X3VzZXIpKQo+ICAJCXJldHVybiAwOwo+Cj4gLQlpZiAoIXN5c19yZWdfcHJlc2VudCh2Y3B1LCBy ZCkpCj4gKwlpZiAoIXN5c19yZWdfcHJlc2VudF9vcl9yYXoodmNwdSwgcmQpKQo+ICAJCXJldHVy biAwOwo+Cj4gIAlpZiAoIWNvcHlfcmVnX3RvX3VzZXIocmQsIHVpbmQpKQo+IGRpZmYgLS1naXQg YS9hcmNoL2FybTY0L2t2bS9zeXNfcmVncy5oIGIvYXJjaC9hcm02NC9rdm0vc3lzX3JlZ3MuaAo+ IGluZGV4IGRmYmIzNDIuLjMwNDkyOGYgMTAwNjQ0Cj4gLS0tIGEvYXJjaC9hcm02NC9rdm0vc3lz X3JlZ3MuaAo+ICsrKyBiL2FyY2gvYXJtNjQva3ZtL3N5c19yZWdzLmgKPiBAQCAtNjYsMTQgKzY2 LDI1IEBAIHN0cnVjdCBzeXNfcmVnX2Rlc2Mgewo+ICAJCQljb25zdCBzdHJ1Y3Qga3ZtX29uZV9y ZWcgKnJlZywgdm9pZCBfX3VzZXIgKnVhZGRyKTsKPiAgCWJvb2wgKCpjaGVja19wcmVzZW50KShj b25zdCBzdHJ1Y3Qga3ZtX3ZjcHUgKnZwY3UsCj4gIAkJCSAgICAgIGNvbnN0IHN0cnVjdCBzeXNf cmVnX2Rlc2MgKnJkKTsKPiArCj4gKwkvKiBPUiBvZiBTUl8qIGZsYWdzICovCj4gKwl1bnNpZ25l ZCBpbnQgZmxhZ3M7Cj4gIH07Cj4KPiArI2RlZmluZSBTUl9SQVpfSUZfQUJTRU5UCSgxIDw8IDAp Cj4gKwo+ICBzdGF0aWMgaW5saW5lIGJvb2wgc3lzX3JlZ19wcmVzZW50KGNvbnN0IHN0cnVjdCBr dm1fdmNwdSAqdmNwdSwKPiAgCQkJCSAgIGNvbnN0IHN0cnVjdCBzeXNfcmVnX2Rlc2MgKnJkKQo+ ICB7Cj4gIAlyZXR1cm4gbGlrZWx5KCFyZC0+Y2hlY2tfcHJlc2VudCkgfHwgcmQtPmNoZWNrX3By ZXNlbnQodmNwdSwgcmQpOwo+ICB9Cj4KPiArc3RhdGljIGlubGluZSBib29sIHN5c19yZWdfcHJl c2VudF9vcl9yYXooY29uc3Qgc3RydWN0IGt2bV92Y3B1ICp2Y3B1LAo+ICsJCQkJCSAgY29uc3Qg c3RydWN0IHN5c19yZWdfZGVzYyAqcmQpCj4gK3sKPiArCXJldHVybiBzeXNfcmVnX3ByZXNlbnQo dmNwdSwgcmQpIHx8IChyZC0+ZmxhZ3MgJiBTUl9SQVpfSUZfQUJTRU5UKTsKPiArfQo+ICsKPiAg c3RhdGljIGlubGluZSB2b2lkIHByaW50X3N5c19yZWdfaW5zdHIoY29uc3Qgc3RydWN0IHN5c19y ZWdfcGFyYW1zICpwKQo+ICB7Cj4gIAkvKiBMb29rLCB3ZSBldmVuIGZvcm1hdHRlZCBpdCBmb3Ig eW91IHRvIHBhc3RlIGludG8gdGhlIHRhYmxlISAqLwoKCi0tCkFsZXggQmVubsOpZQpfX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwprdm1hcm0gbWFpbGluZyBs aXN0Cmt2bWFybUBsaXN0cy5jcy5jb2x1bWJpYS5lZHUKaHR0cHM6Ly9saXN0cy5jcy5jb2x1bWJp YS5lZHUvbWFpbG1hbi9saXN0aW5mby9rdm1hcm0K