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Tue, 04 Aug 2020 18:16:30 +0100 MIME-Version: 1.0 Date: Tue, 04 Aug 2020 18:16:30 +0100 From: Marc Zyngier To: =?UTF-8?Q?Alex_Benn=C3=A9e?= Subject: Re: [PATCH v1 3/3] kernel/configs: don't include PCI_QUIRKS in KVM guest configs In-Reply-To: <87lfiumnc8.fsf@linaro.org> References: <20200804124417.27102-1-alex.bennee@linaro.org> <20200804124417.27102-4-alex.bennee@linaro.org> <87r1smmpw5.fsf@linaro.org> <87lfiumnc8.fsf@linaro.org> User-Agent: Roundcube Webmail/1.4.5 Message-ID: X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: alex.bennee@linaro.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, christoffer.dall@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; 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Tue, 4 Aug 2020 17:16:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596561392; bh=KgUSQXHnQmyfVqBx7P8DiLDgLrGMLQ5sEeXPjkKaMgo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=po6Awiu2jyPPa8K7P1obOSX43I7xN26lmV3hDkANXkQYWOVML8pKHGk7i8bZvGsXJ C7YOUuBeHSAf5ybIvPArid5p2sVn2opD172H2vkd7LXJ3RBWN+wElJAYGQ02xwutbi T1rDroNvCn5e/s/uutC20fI/FKFmzW8QVPCvkUro= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1k30YA-00HReQ-IA; Tue, 04 Aug 2020 18:16:30 +0100 MIME-Version: 1.0 Date: Tue, 04 Aug 2020 18:16:30 +0100 From: Marc Zyngier To: =?UTF-8?Q?Alex_Benn=C3=A9e?= Subject: Re: [PATCH v1 3/3] kernel/configs: don't include PCI_QUIRKS in KVM guest configs In-Reply-To: <87lfiumnc8.fsf@linaro.org> References: <20200804124417.27102-1-alex.bennee@linaro.org> <20200804124417.27102-4-alex.bennee@linaro.org> <87r1smmpw5.fsf@linaro.org> <87lfiumnc8.fsf@linaro.org> User-Agent: Roundcube Webmail/1.4.5 Message-ID: X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: alex.bennee@linaro.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, christoffer.dall@arm.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-20200804_131633_090422_9127DAAC X-CRM114-Status: GOOD ( 14.75 ) 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: christoffer.dall@arm.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.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 T24gMjAyMC0wOC0wNCAxNjo0MCwgQWxleCBCZW5uw6llIHdyb3RlOgo+IE1hcmMgWnluZ2llciA8 bWF6QGtlcm5lbC5vcmc+IHdyaXRlczoKPiAKPj4gT24gMjAyMC0wOC0wNCAxNTo0NCwgQWxleCBC ZW5uw6llIHdyb3RlOgo+Pj4gTWFyYyBaeW5naWVyIDxtYXpAa2VybmVsLm9yZz4gd3JpdGVzOgo+ Pj4gCj4+Pj4gT24gMjAyMC0wOC0wNCAxMzo0NCwgQWxleCBCZW5uw6llIHdyb3RlOgo+Pj4+PiBU aGUgVklSVElPX1BDSSBzdXBwb3J0IGlzIGFuIGlkZWFsaXNlZCBQQ0kgYnVzLCB3ZSBkb24ndCBu ZWVkIGEgCj4+Pj4+IGJ1bmNoCj4+Pj4+IG9mIGJsb2F0IGZvciByZWFsIHdvcmxkIGhhcmR3YXJl IGZvciBhIFZpcnRJTyBndWVzdC4KPj4+PiAKPj4+PiBXaG8gc2F5cyB0aGlzIGd1ZXN0IHdpbGwg b25seSBoYXZlIHZpcnRpbyBkZXZpY2VzPwo+Pj4gCj4+PiBUaGlzIGlzIHRydWUgLSBhbHRob3Vn aCB3aGF0IGlzIHRoZSBwb2ludCBvZiBrdm1fZ3Vlc3QuY29uZmlnPyBXZQo+Pj4gY2VydGFpbmx5 IHR1cm4gb24gYSB3aG9sZSBidW5jaCBvZiB2aXJ0IG9wdGltaXNlZCBwYXRod2F5cyB3aXRoCj4+ PiBQQVJBVklSVAo+Pj4gYW5kIEhZUEVSVklTT1JfR1VFU1QgYWxvbmcgd2l0aCB0aGUgcmVzdCBv ZiBWaXJ0SU8uCj4+IAo+PiBNb3N0IG9mIHdoaWNoIGFjdHVhbGx5IHF1YWxpZmllcyBhcyBibG9h dCBpdHNlbGYgYXMgZmFyIGFzIEtWTS9hcm02NAo+PiBpcyBjb25jZXJuZWQuLi4KPiAKPiBTbyBo ZXJlIGlzIHRoZSBxdWVzdGlvbiAtIGRvZXMgdGhlIGtlcm5lbCBjYXJlIGFib3V0IGhhdmluZyBh IGJsZXNzZWQKPiBjb25maWcgZm9yIGEgbWluaW1hbCB2aWFibGUgZ3Vlc3Q/IFRoZXkgYXJlIGNl cnRhaW5seSB1c2VkIGluIHRoZSBjbG91ZAo+IGJ1dCBJIHVuZGVyc3RhbmQgdGhlIGtlcm5lbCBp cyB0cnlpbmcgdG8gZ2V0IGF3YXkgZnJvbSBoYXZpbmcgYSB6b28gb2YKPiBjb25maWdzLiBXaGF0 IGlzIHRoZSBhY3R1YWwgcG9pbnQgb2Yga3ZtX2d1ZXN0LmNvbmZpZz8gSnVzdCBhbiBlYXN5Cj4g ZW5hYmxpbmcgZm9yIGRldmVsb3BlcnM/CgpUaGUgY2xvdWQgdmVuZG9yIEkga25vdyBjZXJ0YWlu bHkgZG9lc24ndCBwcm92aWRlIGEgImR1bWJlZCBkb3duIgprZXJuZWwgY29uZmlndXJhdGlvbi4g V2hhdCB0aGV5IHJ1biBpcyBlaXRoZXIgYSBkaXN0cm8ga2VybmVsCm9yIHNvbWV0aGluZyB0aGF0 IGZpdHMgdGhlaXIgZW52aXJvbm1lbnQgKHdoaWNoIGRvZXMgaW5jbHVkZQpIVyBQQ0kgZGV2aWNl cywgYW5kIGhhcmRseSBhbnkgdmlydGlvIGRldmljZSkuCgpNeSB0YWtlIGlzIHRoYXQgdGhpcyBr dm0tc3BlY2lhbCBjb25maWcgaXNuJ3QgdGhhdCB1c2VmdWwgaW4KdGhlIHJlYWwgd29ybGQsIGFu ZCBJIGRvbid0IGJlbGlldmUgdGhlcmUgaXMgc3VjaCB0aGluZyBhcyBhCiJtaW5pbWFsIHZpYWJs ZSBndWVzdCIgY29uZmlnLCBjZXJ0YWlubHkgbm90IGFjcm9zcyBhcmNoaXRlY3R1cmVzCmFuZCBW TU1zLiBIb3BlZnVsbHkgaXQgZml0cyBzb21lb25lJ3MgZGV2ZWxvcG1lbnQgd29ya2Zsb3csIGJ1 dAp0aGF0J3MgcHJvYmFibHkgaXQuCgogICAgICAgICAgTS4KLS0gCkphenogaXMgbm90IGRlYWQu IEl0IGp1c3Qgc21lbGxzIGZ1bm55Li4uCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0t a2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFp bG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg== 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 X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6002FC433DF for ; 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Tue, 4 Aug 2020 17:16:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596561392; bh=KgUSQXHnQmyfVqBx7P8DiLDgLrGMLQ5sEeXPjkKaMgo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=po6Awiu2jyPPa8K7P1obOSX43I7xN26lmV3hDkANXkQYWOVML8pKHGk7i8bZvGsXJ C7YOUuBeHSAf5ybIvPArid5p2sVn2opD172H2vkd7LXJ3RBWN+wElJAYGQ02xwutbi T1rDroNvCn5e/s/uutC20fI/FKFmzW8QVPCvkUro= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1k30YA-00HReQ-IA; Tue, 04 Aug 2020 18:16:30 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Date: Tue, 04 Aug 2020 18:16:30 +0100 From: Marc Zyngier To: =?UTF-8?Q?Alex_Benn=C3=A9e?= Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, christoffer.dall@arm.com Subject: Re: [PATCH v1 3/3] kernel/configs: don't include PCI_QUIRKS in KVM guest configs In-Reply-To: <87lfiumnc8.fsf@linaro.org> References: <20200804124417.27102-1-alex.bennee@linaro.org> <20200804124417.27102-4-alex.bennee@linaro.org> <87r1smmpw5.fsf@linaro.org> <87lfiumnc8.fsf@linaro.org> User-Agent: Roundcube Webmail/1.4.5 Message-ID: X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: alex.bennee@linaro.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, christoffer.dall@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 2020-08-04 16:40, Alex Bennée wrote: > Marc Zyngier writes: > >> On 2020-08-04 15:44, Alex Bennée wrote: >>> Marc Zyngier writes: >>> >>>> On 2020-08-04 13:44, Alex Bennée wrote: >>>>> The VIRTIO_PCI support is an idealised PCI bus, we don't need a >>>>> bunch >>>>> of bloat for real world hardware for a VirtIO guest. >>>> >>>> Who says this guest will only have virtio devices? >>> >>> This is true - although what is the point of kvm_guest.config? We >>> certainly turn on a whole bunch of virt optimised pathways with >>> PARAVIRT >>> and HYPERVISOR_GUEST along with the rest of VirtIO. >> >> Most of which actually qualifies as bloat itself as far as KVM/arm64 >> is concerned... > > So here is the question - does the kernel care about having a blessed > config for a minimal viable guest? They are certainly used in the cloud > but I understand the kernel is trying to get away from having a zoo of > configs. What is the actual point of kvm_guest.config? Just an easy > enabling for developers? The cloud vendor I know certainly doesn't provide a "dumbed down" kernel configuration. What they run is either a distro kernel or something that fits their environment (which does include HW PCI devices, and hardly any virtio device). My take is that this kvm-special config isn't that useful in the real world, and I don't believe there is such thing as a "minimal viable guest" config, certainly not across architectures and VMMs. Hopefully it fits someone's development workflow, but that's probably it. M. -- Jazz is not dead. It just smells funny...