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Tue, 12 Jan 2021 11:51:56 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kzIDJ-00060h-Ot for linux-arm-kernel@lists.infradead.org; Tue, 12 Jan 2021 11:51:54 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B666823104; Tue, 12 Jan 2021 11:51:52 +0000 (UTC) Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94) (envelope-from ) id 1kzIDG-006ws6-Kb; Tue, 12 Jan 2021 11:51:50 +0000 MIME-Version: 1.0 Date: Tue, 12 Jan 2021 11:51:50 +0000 From: Marc Zyngier To: Suzuki K Poulose Subject: Re: [PATCH v3 09/21] arm64: cpufeature: Add global feature override facility In-Reply-To: References: <20210111132811.2455113-1-maz@kernel.org> <20210111132811.2455113-10-maz@kernel.org> <20210111184154.GC17941@gaia> <129db8bd3913a90c96d4cfe4f55e27a0@kernel.org> User-Agent: Roundcube Webmail/1.4.9 Message-ID: X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: suzuki.poulose@arm.com, catalin.marinas@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, will@kernel.org, mark.rutland@arm.com, dbrazdil@google.com, alexandru.elisei@arm.com, ardb@kernel.org, jingzhangos@google.com, pajay@qti.qualcomm.com, psodagud@codeaurora.org, sramana@codeaurora.org, james.morse@arm.com, julien.thierry.kdev@gmail.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210112_065154_147765_BE40663C X-CRM114-Status: GOOD ( 21.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Jing Zhang , Prasad Sodagudi , Srinivas Ramana , kernel-team@android.com, Catalin Marinas , Alexandru Elisei , linux-kernel@vger.kernel.org, Ard Biesheuvel , James Morse , Julien Thierry , Ajay Patil , David Brazdil , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjAyMS0wMS0xMiAxMTo1MCwgTWFyYyBaeW5naWVyIHdyb3RlOgo+IEhpIFN1enVraSwKPiAK PiBPbiAyMDIxLTAxLTEyIDA5OjE3LCBTdXp1a2kgSyBQb3Vsb3NlIHdyb3RlOgo+PiBIaSBNYXJj LAo+PiAKPj4gT24gMS8xMS8yMSA3OjQ4IFBNLCBNYXJjIFp5bmdpZXIgd3JvdGU6Cj4gCj4gWy4u Ll0KPiAKPj4+IGRpZmYgLS1naXQgYS9hcmNoL2FybTY0L2tlcm5lbC9jcHVmZWF0dXJlLmMgCj4+ PiBiL2FyY2gvYXJtNjQva2VybmVsL2NwdWZlYXR1cmUuYwo+Pj4gaW5kZXggODk0YWY2MGI5NjY5 Li4wMGQ5OWU1OTNiNjUgMTAwNjQ0Cj4+PiAtLS0gYS9hcmNoL2FybTY0L2tlcm5lbC9jcHVmZWF0 dXJlLmMKPj4+ICsrKyBiL2FyY2gvYXJtNjQva2VybmVsL2NwdWZlYXR1cmUuYwo+Pj4gQEAgLTc3 NCw2ICs3NzQsNyBAQCBzdGF0aWMgdm9pZCBfX2luaXQgaW5pdF9jcHVfZnRyX3JlZyh1MzIgc3lz X3JlZywgCj4+PiB1NjQgbmV3KQo+Pj4gIMKgwqDCoMKgIHU2NCBzdHJpY3RfbWFzayA9IH4weDBV TEw7Cj4+PiAgwqDCoMKgwqAgdTY0IHVzZXJfbWFzayA9IDA7Cj4+PiAgwqDCoMKgwqAgdTY0IHZh bGlkX21hc2sgPSAwOwo+Pj4gK8KgwqDCoCB1NjQgb3ZlcnJpZGVfdmFsID0gMCwgb3ZlcnJpZGVf bWFzayA9IDA7Cj4+PiAKPj4+ICDCoMKgwqDCoCBjb25zdCBzdHJ1Y3QgYXJtNjRfZnRyX2JpdHMg KmZ0cnA7Cj4+PiAgwqDCoMKgwqAgc3RydWN0IGFybTY0X2Z0cl9yZWcgKnJlZyA9IGdldF9hcm02 NF9mdHJfcmVnKHN5c19yZWcpOwo+Pj4gQEAgLTc4MSw5ICs3ODIsMzUgQEAgc3RhdGljIHZvaWQg X19pbml0IGluaXRfY3B1X2Z0cl9yZWcodTMyIHN5c19yZWcsIAo+Pj4gdTY0IG5ldykKPj4+ICDC oMKgwqDCoCBpZiAoIXJlZykKPj4+ICDCoMKgwqDCoMKgwqDCoMKgIHJldHVybjsKPj4+IAo+Pj4g K8KgwqDCoCBpZiAocmVnLT5vdmVycmlkZV9tYXNrICYmIHJlZy0+b3ZlcnJpZGVfdmFsKSB7Cj4+ PiArwqDCoMKgwqDCoMKgwqAgb3ZlcnJpZGVfbWFzayA9ICpyZWctPm92ZXJyaWRlX21hc2s7Cj4+ PiArwqDCoMKgwqDCoMKgwqAgb3ZlcnJpZGVfdmFsID0gKnJlZy0+b3ZlcnJpZGVfdmFsOwo+Pj4g K8KgwqDCoCB9Cj4+PiArCj4+PiAgwqDCoMKgwqAgZm9yIChmdHJwID0gcmVnLT5mdHJfYml0czsg ZnRycC0+d2lkdGg7IGZ0cnArKykgewo+Pj4gIMKgwqDCoMKgwqDCoMKgwqAgdTY0IGZ0cl9tYXNr ID0gYXJtNjRfZnRyX21hc2soZnRycCk7Cj4+PiAgwqDCoMKgwqDCoMKgwqDCoCBzNjQgZnRyX25l dyA9IGFybTY0X2Z0cl92YWx1ZShmdHJwLCBuZXcpOwo+Pj4gK8KgwqDCoMKgwqDCoMKgIHM2NCBm dHJfb3ZyID0gYXJtNjRfZnRyX3ZhbHVlKGZ0cnAsIG92ZXJyaWRlX3ZhbCk7Cj4+PiArCj4+PiAr wqDCoMKgwqDCoMKgwqAgaWYgKChmdHJfbWFzayAmIG92ZXJyaWRlX21hc2spID09IGZ0cl9tYXNr KSB7Cj4+PiArwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBpZiAoZnRyX292ciA8IGZ0cl9uZXcpIHsK Pj4gCj4+IEhlcmUgd2UgYXNzdW1lIHRoYXQgYWxsIHRoZSBmZWF0dXJlcyBhcmUgRlRSX0xPV0VS X1NBRkUuIFdlIGNvdWxkCj4+IHByb2JhYmx5IHVzZSBhcm02NF9mdHJfc2FmZV92YWx1ZShmdHJw LCBmdHJfbmV3LCBmdHJfb3ZyKSBoZXJlID8KPj4gVGhhdCB3b3VsZCBjb3ZlciB1cyBmb3IgYm90 aCBISUdIRVJfU0FGRSBhbmQgTE9XRVJfU0FGRSBmZWF0dXJlcy4KPj4gSG93ZXZlciB0aGF0IG1h eSBiZSByZXN0cmljdGl2ZSBmb3IgRlRSX0VYQUNULCBhcyB3ZSB0aGUgc2FmZQo+PiB2YWx1ZSB3 b3VsZCBiZSBzZXQgdG8gImZ0ci0+c2FmZV92YWwiLiBJIGd1ZXNzIHRoYXQgbWF5IGJlIGJldHRl cgo+PiB0aGFuIGZvcmNpbmcgdG8gdXNlIGFuIHVuc2FmZSB2YWx1ZSBmb3IgdGhlIGJvb3QgQ1BV LCB3aGljaCBjb3VsZAo+PiBhbnl3YXkgY29uZmxpY3Qgd2l0aCB0aGUgb3RoZXIgQ1BVcyBhbmQg ZXZlbnR1YWxseSB0cmlnZ2VyIHRoZQo+PiBmdHIgYWx1ZSB0byBiZSBzYWZlX3ZhbC4KPiAKPiBJ IGxpa2UgdGhlIGlkZWEgb2YgdXNpbmcgdGhlIGhlbHBlciwgYXMgaXQgY2xlYW51cHMgdXAgdGhl IGNvZGUgYSBiaXQuCj4gSG93ZXZlciwgbm90IGJlaW5nIHRvIHNldCBhIGZlYXR1cmUgdG8gYSBj ZXJ0YWluIHZhbHVlIGNvdWxkIGJlIAo+IHJlc3RyaWN0aXZlLAo+IGFzIGluIGdlbmVyYWwsIGl0 IG1lYW5zIHRoYXQgd2UgY2FuIG9ubHkgZGlzYWJsZSBhIGZlYXR1cmUgYW5kIG5vdCAKPiBhZGp1 c3QKPiBpdHMgbGV2ZWwgb2Ygc3VwcG9ydC4KPiAKPiBUYWtlIFBNVVZFUiBmb3IgZXhhbXBsZTog d2l0aCB0aGUgaGVscGVyLCBJIGNhbid0IG92ZXJyaWRlIGl0IGZyb20gdjguNCAKPiB0bwo+IHY4 LjEuIEkgY2FuIG9ubHkgZ28gdG8gdjguMC4KCkFjdHVhbGx5LCB3ZSBjYW4gb25seSAqZGlzYWJs ZSogdGhlIFBNVSBhbHRvZ2V0aGVyLiBTYW1lIHF1ZXN0aW9uIAp0aG91Z2guLi4KCiAgICAgICAg IE0uCgo+IAo+IElzIGl0IHNvbWV0aGluZyB3ZSBjYXJlIGFib3V0Pwo+IAo+IFRoYW5rcywKPiAK PiAgICAgICAgIE0uCgotLSAKSmF6eiBpcyBub3QgZGVhZC4gSXQganVzdCBzbWVsbHMgZnVubnku Li4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4 LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFk Lm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFy bS1rZXJuZWwK