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Sat, 10 Oct 2026 09:19:08 +0000 Date: Sat, 10 Oct 2026 10:19:07 +0100 Message-ID: <865wz93oc4.wl-maz@kernel.org> From: Marc Zyngier To: Fuad Tabba Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, Suzuki K Poulose , 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, 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, jonathan.cameron@oss.qualcomm.com, Sudeep Holla Subject: Re: [PATCH v23 00/14] KVM: arm64: CCA: Add basic plumbing for Realms In-Reply-To: References: <20261007073537.2454351-1-suzuki.poulose@arm.com> <179155224299.829527.1733164520192309991.b4-ty@b4> 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=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: fuad.tabba@linux.dev, kvm@vger.kernel.org, kvmarm@lists.linux.dev, suzuki.poulose@arm.com, 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, 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, jonathan.cameron@oss.qualcomm.com, sudeep.holla@kernel.org 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 Fri, 09 Oct 2026 15:20:44 +0100, Fuad Tabba wrote: > > Hi Marc, > > On Fri, 09 Oct 2026 14:28:03 +0100, Marc Zyngier wrote: > [...] > > Of course, mmu.c is where the crap happens, so anyone with any interest > > in this stuff being halfway sane, please review the conflict resolution. > > I went through the mmu.c resolution and it looks good to me. Unmap and > aging are still no-ops for protected VMs, their abort handler is > unchanged, and the default op keeps the tracked unmap for nested MMUs. > Two minor things you might want to tidy up. > > kvm_vm_stage2_unmap_range() repeats the lockdep_assert_held_write() > and WARN_ON(size & ~PAGE_MASK) that kvm_stage2_unmap_range() already > does before calling the op. > > The VM_WARN_ON_ONCE() in kvm_vm_mem_abort() reads the ESR from the > vcpu again, where next had moved these checks to s2fd->esr. It's the > same result today, since the only caller handles a real abort, but > this (and dropping the vcpu local) would keep it in line with the > rest: > > VM_WARN_ON_ONCE(kvm_s2_fault_is_perm(s2fd) && > !esr_abt_is_write_fault(s2fd->esr) && > !kvm_s2_fault_is_exec(s2fd)); Thanks for looking. I've now applied this to the merge resolution. Cheers, M. -- Without deviation from the norm, progress is not possible.