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Tue, 04 Aug 2020 08:40:10 -0700 (PDT) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id a10sm30539397wrx.15.2020.08.04.08.40.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Aug 2020 08:40:08 -0700 (PDT) Received: from zen (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id A1FA31FF7E; Tue, 4 Aug 2020 16:40:07 +0100 (BST) References: <20200804124417.27102-1-alex.bennee@linaro.org> <20200804124417.27102-4-alex.bennee@linaro.org> <87r1smmpw5.fsf@linaro.org> User-agent: mu4e 1.5.5; emacs 28.0.50 From: Alex =?utf-8?Q?Benn=C3=A9e?= To: Marc Zyngier Subject: Re: [PATCH v1 3/3] kernel/configs: don't include PCI_QUIRKS in KVM guest configs In-reply-to: Date: Tue, 04 Aug 2020 16:40:07 +0100 Message-ID: <87lfiumnc8.fsf@linaro.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200804_114011_889296_9857FED8 X-CRM114-Status: GOOD ( 12.00 ) 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-Type: text/plain; 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Tue, 04 Aug 2020 08:40:10 -0700 (PDT) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id a10sm30539397wrx.15.2020.08.04.08.40.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Aug 2020 08:40:08 -0700 (PDT) Received: from zen (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id A1FA31FF7E; Tue, 4 Aug 2020 16:40:07 +0100 (BST) References: <20200804124417.27102-1-alex.bennee@linaro.org> <20200804124417.27102-4-alex.bennee@linaro.org> <87r1smmpw5.fsf@linaro.org> User-agent: mu4e 1.5.5; emacs 28.0.50 From: Alex =?utf-8?Q?Benn=C3=A9e?= To: Marc Zyngier 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: Date: Tue, 04 Aug 2020 16:40:07 +0100 Message-ID: <87lfiumnc8.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Marc Zyngier writes: > On 2020-08-04 15:44, Alex Benn=C3=A9e wrote: >> Marc Zyngier writes: >>=20 >>> On 2020-08-04 13:44, Alex Benn=C3=A9e 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. >>>=20 >>> Who says this guest will only have virtio devices? >>=20 >> This is true - although what is the point of kvm_guest.config? We >> certainly turn on a whole bunch of virt optimised pathways with=20 >> 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? > > M. --=20 Alex Benn=C3=A9e