From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8817751025; Mon, 22 Jan 2024 18:00:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705946420; cv=none; b=COhhDyP3I0brm5h6VOn3XOFfDk7henD/Vkk9Rh2HVGKouaNvo2hl9PKnE0CzQU6hvnsFQ0ox9O8eI51UGWS8yaIrbRdyKta/xHGpyO0sB7bvsRApiwizSk6FXMDGHSsAUMuFbK+f35fHaU6bki18IAXlPUqW1ZGh0c9hSTnBgkQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705946420; c=relaxed/simple; bh=1QPBYp1cuVlPzvmIrkvDtRmi9tk3BbCt5QfOkc4KoTA=; h=Date:From:To:CC:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=oNYcKz0LIXIuDfoVseADQ+wbhY/PxzZL+hDYsVttKEi4SsPnzZaEvgJeVY86/PdCMllRsfJ7z+6xvqJFvlpntca6QpEyLQvycsXODO/hMhE8btP6tezSbS1hs/wPOfifpYHKKmWXlqhUbH54CNAbwQOnuWcay96BUo5/yZ1Kumw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=Huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=Huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.231]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4TJdGS60Srz67ZCr; Tue, 23 Jan 2024 01:57:20 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id DA1F61400F4; Tue, 23 Jan 2024 02:00:14 +0800 (CST) Received: from localhost (10.202.227.76) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Mon, 22 Jan 2024 18:00:14 +0000 Date: Mon, 22 Jan 2024 18:00:13 +0000 From: Jonathan Cameron To: "Rafael J. Wysocki" CC: Russell King , , , , , , , , , , , , , , , Salil Mehta , Jean-Philippe Brucker , , , James Morse Subject: Re: [PATCH RFC v3 05/21] ACPI: Rename ACPI_HOTPLUG_CPU to include 'present' Message-ID: <20240122180013.000016d5@Huawei.com> In-Reply-To: References: Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To lhrpeml500005.china.huawei.com (7.191.163.240) On Mon, 18 Dec 2023 21:35:16 +0100 "Rafael J. Wysocki" wrote: > On Wed, Dec 13, 2023 at 1:49=E2=80=AFPM Russell King wrote: > > > > From: James Morse > > > > The code behind ACPI_HOTPLUG_CPU allows a not-present CPU to become > > present. =20 >=20 > Right. >=20 > > This isn't the only use of HOTPLUG_CPU. On arm64 and riscv > > CPUs can be taken offline as a power saving measure. =20 >=20 > But still there is the case in which a non-present CPU can become > present, isn't it there? Not yet defined by the architectures (and I'm assuming it probably never wi= ll be). The original proposal we took to ARM was to do exactly that - they pushed back hard on the basis there was no architecturally safe way to implement i= t. Too much of the ARM arch has to exist from the start of time. https://lore.kernel.org/linux-arm-kernel/cbaa6d68-6143-e010-5f3c-ec62f879ad= 95@arm.com/ is one of the relevant threads of the kernel side of that discussion. Not to put specific words into the ARM architects mouths, but the short description is that there is currently no demand for working out how to make physical CPU hotplug possible, as such they will not provide an architecturally compliant way to do it for virtual CPU hotplug a= nd another means is needed (which is why this series doesn't use the present b= it for that purpose and we have the Online capable bit in MADT/GICC) It was a 'fun' dance of several years to get to that clarification. As another fun fact, the same is defined for x86, but I don't think anyone has used it yet (GICC for ARM has an online capable bit in the flags= to enable this, which was remarkably similar to the online capable bit in the flags of the Local APIC entries as added fairly recently). >=20 > > On arm64 an offline CPU may be disabled by firmware, preventing it from > > being brought back online, but it remains present throughout. > > > > Adding code to prevent user-space trying to online these disabled CPUs > > needs some additional terminology. > > > > Rename the Kconfig symbol CONFIG_ACPI_HOTPLUG_PRESENT_CPU to reflect > > that it makes possible CPUs present. =20 >=20 > Honestly, I don't think that this change is necessary or even useful. Whilst it's an attempt to avoid future confusion, the rename is not something I really care about so my advice to Russell is drop it unless you are attached to it! Jonathan >=20 > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 179D0C47DD3 for ; Mon, 22 Jan 2024 18:00:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:CC:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=BFdKvfACDXAUDPK3BOP5UOayGl1NEppizpzVOYkVZOY=; b=cCQfOibL6I3EOA MxFNztsMlI+8Hhrs/auYLPPxQWTzJI97p6WXkRX/pfzvtHMXtm69RR0IQZpMRbNx6tbT/As9Ipooj eRXnjuli3wF1mhggEAxexo8lKSjfzOknvSpmp55phVmdC7QMSf2xI534qgK7TIGcTCL+5ZdCywSGE gP82VVEsqzxXAK0TlxeOzsCh8sDNtCjiinba5uVcNDhY2BvA4tDUIXT7qKWO8Pz5RslgNiXXGCQgH Y7RuHmaIXgnU3009rfl81CadEDDjDXjxXrBFgTNYcKGZpD8PtkRxyszQSczjRk0QTpaRqFQUvT29y 5slJwP+WhcTDZKDI8LEA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rRyaw-00DOPB-32; Mon, 22 Jan 2024 18:00:26 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rRyas-00DON7-1w; Mon, 22 Jan 2024 18:00:25 +0000 Received: from mail.maildlp.com (unknown [172.18.186.231]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4TJdGS60Srz67ZCr; Tue, 23 Jan 2024 01:57:20 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id DA1F61400F4; Tue, 23 Jan 2024 02:00:14 +0800 (CST) Received: from localhost (10.202.227.76) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Mon, 22 Jan 2024 18:00:14 +0000 Date: Mon, 22 Jan 2024 18:00:13 +0000 From: Jonathan Cameron To: "Rafael J. Wysocki" CC: Russell King , , , , , , , , , , , , , , , Salil Mehta , Jean-Philippe Brucker , , , James Morse Subject: Re: [PATCH RFC v3 05/21] ACPI: Rename ACPI_HOTPLUG_CPU to include 'present' Message-ID: <20240122180013.000016d5@Huawei.com> In-Reply-To: References: Organization: Huawei Technologies Research and Development (UK) Ltd. 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Mon, 22 Jan 2024 18:00:26 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rRyas-00DON7-1w; Mon, 22 Jan 2024 18:00:25 +0000 Received: from mail.maildlp.com (unknown [172.18.186.231]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4TJdGS60Srz67ZCr; Tue, 23 Jan 2024 01:57:20 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id DA1F61400F4; Tue, 23 Jan 2024 02:00:14 +0800 (CST) Received: from localhost (10.202.227.76) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Mon, 22 Jan 2024 18:00:14 +0000 Date: Mon, 22 Jan 2024 18:00:13 +0000 From: Jonathan Cameron To: "Rafael J. Wysocki" CC: Russell King , , , , , , , , , , , , , , , Salil Mehta , Jean-Philippe Brucker , , , James Morse Subject: Re: [PATCH RFC v3 05/21] ACPI: Rename ACPI_HOTPLUG_CPU to include 'present' Message-ID: <20240122180013.000016d5@Huawei.com> In-Reply-To: References: Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 X-Originating-IP: [10.202.227.76] X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240122_100022_923965_9B0FD039 X-CRM114-Status: GOOD ( 21.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gTW9uLCAxOCBEZWMgMjAyMyAyMTozNToxNiArMDEwMAoiUmFmYWVsIEouIFd5c29ja2kiIDxy YWZhZWxAa2VybmVsLm9yZz4gd3JvdGU6Cgo+IE9uIFdlZCwgRGVjIDEzLCAyMDIzIGF0IDE6NDni gK9QTSBSdXNzZWxsIEtpbmcgPHJtaytrZXJuZWxAYXJtbGludXgub3JnLnVrPiB3cm90ZToKPiA+ Cj4gPiBGcm9tOiBKYW1lcyBNb3JzZSA8amFtZXMubW9yc2VAYXJtLmNvbT4KPiA+Cj4gPiBUaGUg Y29kZSBiZWhpbmQgQUNQSV9IT1RQTFVHX0NQVSBhbGxvd3MgYSBub3QtcHJlc2VudCBDUFUgdG8g YmVjb21lCj4gPiBwcmVzZW50LiAgCj4gCj4gUmlnaHQuCj4gCj4gPiBUaGlzIGlzbid0IHRoZSBv bmx5IHVzZSBvZiBIT1RQTFVHX0NQVS4gT24gYXJtNjQgYW5kIHJpc2N2Cj4gPiBDUFVzIGNhbiBi ZSB0YWtlbiBvZmZsaW5lIGFzIGEgcG93ZXIgc2F2aW5nIG1lYXN1cmUuICAKPiAKPiBCdXQgc3Rp bGwgdGhlcmUgaXMgdGhlIGNhc2UgaW4gd2hpY2ggYSBub24tcHJlc2VudCBDUFUgY2FuIGJlY29t ZQo+IHByZXNlbnQsIGlzbid0IGl0IHRoZXJlPwoKTm90IHlldCBkZWZpbmVkIGJ5IHRoZSBhcmNo aXRlY3R1cmVzIChhbmQgSSdtIGFzc3VtaW5nIGl0IHByb2JhYmx5IG5ldmVyIHdpbGwgYmUpLgoK VGhlIG9yaWdpbmFsIHByb3Bvc2FsIHdlIHRvb2sgdG8gQVJNIHdhcyB0byBkbyBleGFjdGx5IHRo YXQgLSB0aGV5IHB1c2hlZApiYWNrIGhhcmQgb24gdGhlIGJhc2lzIHRoZXJlIHdhcyBubyBhcmNo aXRlY3R1cmFsbHkgc2FmZSB3YXkgdG8gaW1wbGVtZW50IGl0LgpUb28gbXVjaCBvZiB0aGUgQVJN IGFyY2ggaGFzIHRvIGV4aXN0IGZyb20gdGhlIHN0YXJ0IG9mIHRpbWUuCgpodHRwczovL2xvcmUu a2VybmVsLm9yZy9saW51eC1hcm0ta2VybmVsL2NiYWE2ZDY4LTYxNDMtZTAxMC01ZjNjLWVjNjJm ODc5YWQ5NUBhcm0uY29tLwppcyBvbmUgb2YgdGhlIHJlbGV2YW50IHRocmVhZHMgb2YgdGhlIGtl cm5lbCBzaWRlIG9mIHRoYXQgZGlzY3Vzc2lvbi4KCk5vdCB0byBwdXQgc3BlY2lmaWMgd29yZHMg aW50byB0aGUgQVJNIGFyY2hpdGVjdHMgbW91dGhzLCBidXQgdGhlCnNob3J0IGRlc2NyaXB0aW9u IGlzIHRoYXQgdGhlcmUgaXMgY3VycmVudGx5IG5vIGRlbWFuZCBmb3Igd29ya2luZwpvdXQgaG93 IHRvIG1ha2UgcGh5c2ljYWwgQ1BVIGhvdHBsdWcgcG9zc2libGUsIGFzIHN1Y2ggdGhleSB3aWxs IG5vdApwcm92aWRlIGFuIGFyY2hpdGVjdHVyYWxseSBjb21wbGlhbnQgd2F5IHRvIGRvIGl0IGZv ciB2aXJ0dWFsIENQVSBob3RwbHVnIGFuZAphbm90aGVyIG1lYW5zIGlzIG5lZWRlZCAod2hpY2gg aXMgd2h5IHRoaXMgc2VyaWVzIGRvZXNuJ3QgdXNlIHRoZSBwcmVzZW50IGJpdApmb3IgdGhhdCBw dXJwb3NlIGFuZCB3ZSBoYXZlIHRoZSBPbmxpbmUgY2FwYWJsZSBiaXQgaW4gTUFEVC9HSUNDKQoK SXQgd2FzIGEgJ2Z1bicgZGFuY2Ugb2Ygc2V2ZXJhbCB5ZWFycyB0byBnZXQgdG8gdGhhdCBjbGFy aWZpY2F0aW9uLgpBcyBhbm90aGVyIGZ1biBmYWN0LCB0aGUgc2FtZSBpcyBkZWZpbmVkIGZvciB4 ODYsIGJ1dCBJIGRvbid0IHRoaW5rCmFueW9uZSBoYXMgdXNlZCBpdCB5ZXQgKEdJQ0MgZm9yIEFS TSBoYXMgYW4gb25saW5lIGNhcGFibGUgYml0IGluIHRoZSBmbGFncyB0bwplbmFibGUgdGhpcywg d2hpY2ggd2FzIHJlbWFya2FibHkgc2ltaWxhciB0byB0aGUgb25saW5lIGNhcGFibGUgYml0IGlu IHRoZQpmbGFncyBvZiB0aGUgTG9jYWwgQVBJQyBlbnRyaWVzIGFzIGFkZGVkIGZhaXJseSByZWNl bnRseSkuCgo+IAo+ID4gT24gYXJtNjQgYW4gb2ZmbGluZSBDUFUgbWF5IGJlIGRpc2FibGVkIGJ5 IGZpcm13YXJlLCBwcmV2ZW50aW5nIGl0IGZyb20KPiA+IGJlaW5nIGJyb3VnaHQgYmFjayBvbmxp bmUsIGJ1dCBpdCByZW1haW5zIHByZXNlbnQgdGhyb3VnaG91dC4KPiA+Cj4gPiBBZGRpbmcgY29k ZSB0byBwcmV2ZW50IHVzZXItc3BhY2UgdHJ5aW5nIHRvIG9ubGluZSB0aGVzZSBkaXNhYmxlZCBD UFVzCj4gPiBuZWVkcyBzb21lIGFkZGl0aW9uYWwgdGVybWlub2xvZ3kuCj4gPgo+ID4gUmVuYW1l IHRoZSBLY29uZmlnIHN5bWJvbCBDT05GSUdfQUNQSV9IT1RQTFVHX1BSRVNFTlRfQ1BVIHRvIHJl ZmxlY3QKPiA+IHRoYXQgaXQgbWFrZXMgcG9zc2libGUgQ1BVcyBwcmVzZW50LiAgCj4gCj4gSG9u ZXN0bHksIEkgZG9uJ3QgdGhpbmsgdGhhdCB0aGlzIGNoYW5nZSBpcyBuZWNlc3Nhcnkgb3IgZXZl biB1c2VmdWwuCgpXaGlsc3QgaXQncyBhbiBhdHRlbXB0IHRvIGF2b2lkIGZ1dHVyZSBjb25mdXNp b24sIHRoZSByZW5hbWUgaXMKbm90IHNvbWV0aGluZyBJIHJlYWxseSBjYXJlIGFib3V0IHNvIG15 IGFkdmljZSB0byBSdXNzZWxsIGlzIGRyb3AKaXQgdW5sZXNzIHlvdSBhcmUgYXR0YWNoZWQgdG8g aXQhCgpKb25hdGhhbgoKCj4gCj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX18KPiBsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdAo+IGxpbnV4LWFybS1r ZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwo+IGh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21h aWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAoKCl9fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0Cmxp bnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFk Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK