From nobody Wed Dec 17 16:11:08 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id CA9C134FF46; Wed, 17 Dec 2025 10:13:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765966430; cv=none; b=keLTHbpsrDWYSzQbfXN2mvS4CdhSPSAxqgcBjZFdCaoudwm8PAhfWAouXu2bZYnm1qEf7OZRwMU29dDTii5CfHi5WNDEYmCGbpbIyO6ZBFgoZk4guNroQ8k+wxnsHE6azLeE45JuqQhWhK+eoy+kryOd4P6uMva9DsWmjH9ycNw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765966430; c=relaxed/simple; bh=sny76D7zcho6byNZw//ddnnEMimtEenabitLC8oE8jg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WCcb0nPQJV6ro1gtFYU0jTjuXBg22X7KbD+6FpaaeibP5saHoefcoygZ3zWsO2KGXvWn42gj2ci+cBFa8+8mGLltawrs1vI+brHaSsqM/U8JBydXd/E4yaSCpsRXsWaLE2ZeNRYyOqVJQtT5Qc0TLAKATBdmMCxq1Cf0pRV837Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2175D1691; Wed, 17 Dec 2025 02:13:41 -0800 (PST) Received: from e122027.arm.com (unknown [10.57.45.201]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 02AC23F73B; Wed, 17 Dec 2025 02:13:43 -0800 (PST) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , 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 , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Vishal Annapurve Subject: [PATCH v12 25/46] KVM: arm64: Handle realm VCPU load Date: Wed, 17 Dec 2025 10:11:02 +0000 Message-ID: <20251217101125.91098-26-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251217101125.91098-1-steven.price@arm.com> References: <20251217101125.91098-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When loading a realm VCPU much of the work is handled by the RMM so only some of the actions are required. Rearrange kvm_arch_vcpu_load() slightly so we can bail out early for a realm guest. Signed-off-by: Steven Price --- arch/arm64/kvm/arm.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 0a06ed9d1a64..06070bc47ee3 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -641,7 +641,7 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) struct kvm_s2_mmu *mmu; int *last_ran; =20 - if (is_protected_kvm_enabled()) + if (is_protected_kvm_enabled() || kvm_is_realm(vcpu->kvm)) goto nommu; =20 if (vcpu_has_nv(vcpu)) @@ -685,12 +685,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) kvm_vgic_load(vcpu); kvm_vcpu_load_debug(vcpu); kvm_vcpu_load_fgt(vcpu); - if (has_vhe()) - kvm_vcpu_load_vhe(vcpu); - kvm_arch_vcpu_load_fp(vcpu); - kvm_vcpu_pmu_restore_guest(vcpu); - if (kvm_arm_is_pvtime_enabled(&vcpu->arch)) - kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu); =20 if (kvm_vcpu_should_clear_twe(vcpu)) vcpu->arch.hcr_el2 &=3D ~HCR_TWE; @@ -712,6 +706,17 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) &vcpu->arch.vgic_cpu.vgic_v3); } =20 + /* No additional state needs to be loaded on Realmed VMs */ + if (vcpu_is_rec(vcpu)) + return; + + if (has_vhe()) + kvm_vcpu_load_vhe(vcpu); + kvm_arch_vcpu_load_fp(vcpu); + kvm_vcpu_pmu_restore_guest(vcpu); + if (kvm_arm_is_pvtime_enabled(&vcpu->arch)) + kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu); + if (!cpumask_test_cpu(cpu, vcpu->kvm->arch.supported_cpus)) vcpu_set_on_unsupported_cpu(vcpu); } --=20 2.43.0