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Sat, 03 Oct 2026 17:29:16 +0000 Date: Sat, 03 Oct 2026 18:32:23 +0100 Message-ID: <87ld8e3d20.wl-maz@kernel.org> From: Marc Zyngier To: Suzuki K Poulose Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, sudeep.holla@arm.com, jonathan.cameron@oss.qualcomm.com Subject: Re: [PATCH v21 10/23] KVM: arm64: Add VM specific callback for S2 MMU operations In-Reply-To: References: <20261001210703.1597150-1-suzuki.poulose@arm.com> <20261001210703.1597150-11-suzuki.poulose@arm.com> <86ik3j2m5v.wl-maz@kernel.org> <9873fb9d-6f32-46f6-bcac-6a52e293d011@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: suzuki.poulose@arm.com, kvm@vger.kernel.org, kvmarm@lists.linux.dev, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, sudeep.holla@arm.com, jonathan.cameron@oss.qualcomm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, 03 Oct 2026 17:12:28 +0100, Suzuki K Poulose wrote: >=20 > On 03/10/2026 16:30, Suzuki K Poulose wrote: > > On 03/10/2026 10:01, Marc Zyngier wrote: > >> On Thu, 01 Oct 2026 22:06:50 +0100, > >> Suzuki K Poulose wrote: > >>>=20 > >>> Add VM type specific S2 MMU operation backends which can be > >>> initialized per > >>> VM flavor, to keep the handling cleaner. > >>>=20 > >>> Reviewed-by: Jonathan Cameron > >>> Tested-by: Gavin Shan > >>> Signed-off-by: Suzuki K Poulose > >>> --- > >>> Changes since v19: > >>> =C2=A0 - Add a blank line in kvm_arch_flush_remote_tlbs() > >=20 > >=20 > >>> =C2=A0 struct kvm_s2_mmu { > >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 struct kvm_vmid vmid; > >>> @@ -332,6 +345,8 @@ struct kvm_arch { > >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ > >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 u64 fgu[__NR_FGT_GROUP_IDS__]; > >>> +=C2=A0=C2=A0=C2=A0 const struct kvm_vm_s2_ops *vm_s2_ops; > >>> + > >>=20 > >> If you're touching this patch, can you please move this pointer next > >> to the vcpu_ops pointer? > >=20 > > Sure, I will do that. >=20 > Sorry, this is only stored in kvm_arch, while the vcpu_ops are stored > in the vcpu_arch, to avoid pointer chasing vcpu->kvm->arch->. Ah, my bad, > I could move it closer to the vm_flavor ? Maybe. Check whether that introduces a hole or not (I'm trying to keep this structure as packed as possible). But we can always change this later on. Thanks, M. --=20 Jazz isn't dead. It just smells funny.