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[175.34.8.244]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-841d7300ea4sm3790751b3a.56.2026.05.27.21.07.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 27 May 2026 21:07:37 -0700 (PDT) Message-ID: <5ea74b6a-a51a-415e-b53f-5ece9829dee8@redhat.com> Date: Thu, 28 May 2026 14:07:27 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v14 20/44] arm64: RMI: Support for the VGIC in realms To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo.Pieralisi2@arm.com References: <20260513131757.116630-1-steven.price@arm.com> <20260513131757.116630-21-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20260513131757.116630-21-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Steve, On 5/13/26 11:17 PM, Steven Price wrote: > The RMM provides emulation of a VGIC to the realm guest. With RMM v2.0 > the registers are passed in the system registers so this works similar > to a normal guest, but kvm_arch_vcpu_put() need reordering to early out, > and realm guests don't support GICv2 even if the host does. > > Signed-off-by: Steven Price > --- > Changes from v12: > * GIC registers are now passed in the system registers rather than via > rec_entry/rec_exit which removes most of the changes. > Changes from v11: > * Minor changes to align with the previous patches. Note that the VGIC > handling will change with RMM v2.0. > Changes from v10: > * Make sure we sync the VGIC v4 state, and only populate valid lrs from > the list. > Changes from v9: > * Copy gicv3_vmcr from the RMM at the same time as gicv3_hcr rather > than having to handle that as a special case. > Changes from v8: > * Propagate gicv3_hcr to from the RMM. > Changes from v5: > * Handle RMM providing fewer GIC LRs than the hardware supports. > --- > arch/arm64/kvm/arm.c | 11 ++++++++--- > arch/arm64/kvm/vgic/vgic-init.c | 2 +- > 2 files changed, 9 insertions(+), 4 deletions(-) > > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c > index 93d34762db91..21d9dfdb1ea0 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -786,19 +786,24 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) > kvm_call_hyp_nvhe(__pkvm_vcpu_put); > } > > + kvm_timer_vcpu_put(vcpu); > + kvm_vgic_put(vcpu); > + > + vcpu->cpu = -1; > + > + if (vcpu_is_rec(vcpu)) > + return; > + For a REC, kvm_vcpu_{load, put}_debug() becomes unbalanced in kvm_arch_vcpu_{load, put}(). kvm_vcpu_load_debug() is called in kvm_arch_vcpu_load(), but kvm_vcpu_put_debug() won't be called in kvm_arch_vcpu_put() after this whole series is applied. > kvm_vcpu_put_debug(vcpu); > kvm_arch_vcpu_put_fp(vcpu); > if (has_vhe()) > kvm_vcpu_put_vhe(vcpu); > - kvm_timer_vcpu_put(vcpu); > - kvm_vgic_put(vcpu); > kvm_vcpu_pmu_restore_host(vcpu); > if (vcpu_has_nv(vcpu)) > kvm_vcpu_put_hw_mmu(vcpu); > kvm_arm_vmid_clear_active(); > > vcpu_clear_on_unsupported_cpu(vcpu); > - vcpu->cpu = -1; > } > > static void __kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu) > diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c > index 933983bb2005..a9db963dfd23 100644 > --- a/arch/arm64/kvm/vgic/vgic-init.c > +++ b/arch/arm64/kvm/vgic/vgic-init.c > @@ -81,7 +81,7 @@ int kvm_vgic_create(struct kvm *kvm, u32 type) > * the proper checks already. > */ > if (type == KVM_DEV_TYPE_ARM_VGIC_V2 && > - !kvm_vgic_global_state.can_emulate_gicv2) > + (!kvm_vgic_global_state.can_emulate_gicv2 || kvm_is_realm(kvm))) > return -ENODEV; > > /* Thanks, Gavin