From nobody Sat Feb 7 06:40:12 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7771D334398; Wed, 20 Aug 2025 14:58:05 +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=1755701886; cv=none; b=lIA4yLyqMvFeQAGkQS1yygvQ5n03vbU65S94EbVhgFj8etIjw6QgwBDj5XJvfMYopyLM+72G3vPnvXh2vh84HNlL8bKqWTsRL7+irsyKw+JOvPPM6AjIxUIyi8GyF1Or6gmuV0/rNIQrpgO8gfoE5xka39+dYBE8+60S0pPJVSY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755701886; c=relaxed/simple; bh=v8+MMGHbBiOZEbGP1aLfGJT3+AUPFXWTYCcSlZHj62E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Wfsf15JUDpe2QCdTJU7ffRzGP8wSfKbA48Fsugg35yQ9a7hiiCugUAE5gHand5GKMKf3juZ3bmME/F1BnDXPqpOxUqdPtoQVpTmi8YdFLDqyn5qx59TiN9bkAdoW1WO7rH7mvlDU1rZoE7YYZC+EJUcqYWURs941fReYiAVFhtA= 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 CEA9D1D31; Wed, 20 Aug 2025 07:57:56 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.2.58]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 96A243F738; Wed, 20 Aug 2025 07:58:00 -0700 (PDT) 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 v10 12/43] KVM: arm64: vgic: Provide helper for number of list registers Date: Wed, 20 Aug 2025 15:55:32 +0100 Message-ID: <20250820145606.180644-13-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250820145606.180644-1-steven.price@arm.com> References: <20250820145606.180644-1-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" Currently the number of list registers available is stored in a global (kvm_vgic_global_state.nr_lr). With Arm CCA the RMM is permitted to reserve list registers for its own use and so the number of available list registers can be fewer for a realm VM. Provide a wrapper function to fetch the global in preparation for restricting nr_lr when dealing with a realm VM. Reviewed-by: Gavin Shan Reviewed-by: Suzuki K Poulose Signed-off-by: Steven Price --- New patch for v6 --- arch/arm64/kvm/vgic/vgic.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c index f5148b38120a..b70bff9a624f 100644 --- a/arch/arm64/kvm/vgic/vgic.c +++ b/arch/arm64/kvm/vgic/vgic.c @@ -21,6 +21,11 @@ struct vgic_global kvm_vgic_global_state __ro_after_init= =3D { .gicv3_cpuif =3D STATIC_KEY_FALSE_INIT, }; =20 +static inline int kvm_vcpu_vgic_nr_lr(struct kvm_vcpu *vcpu) +{ + return kvm_vgic_global_state.nr_lr; +} + /* * Locking order is always: * kvm->lock (mutex) @@ -802,7 +807,7 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu) lockdep_assert_held(&vgic_cpu->ap_list_lock); =20 count =3D compute_ap_list_depth(vcpu, &multi_sgi); - if (count > kvm_vgic_global_state.nr_lr || multi_sgi) + if (count > kvm_vcpu_vgic_nr_lr(vcpu) || multi_sgi) vgic_sort_ap_list(vcpu); =20 count =3D 0; @@ -831,7 +836,7 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu) =20 raw_spin_unlock(&irq->irq_lock); =20 - if (count =3D=3D kvm_vgic_global_state.nr_lr) { + if (count =3D=3D kvm_vcpu_vgic_nr_lr(vcpu)) { if (!list_is_last(&irq->ap_list, &vgic_cpu->ap_list_head)) vgic_set_underflow(vcpu); @@ -840,7 +845,7 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu) } =20 /* Nuke remaining LRs */ - for (i =3D count ; i < kvm_vgic_global_state.nr_lr; i++) + for (i =3D count; i < kvm_vcpu_vgic_nr_lr(vcpu); i++) vgic_clear_lr(vcpu, i); =20 if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) --=20 2.43.0