From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1A6DBCD4F21 for ; Wed, 13 May 2026 13:21:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=E3v7YgHFGpcFQUwKh4rZOzITP/brMAJUcHO5kr1rp7k=; b=UugBeFuNqyGplgu8dzFvkyQdPe kDM9DsqRYM40k26P6YovIXXqugP9IhdyJwb+wGMsgRiab+8lihY5yLbCLfuYdzk68beFSOn1drMNw jTEVEhsArUQ7Ul0evIO6QNRR0alpbeTK1XrYiDXo1ArlqJjwXV/n3/Jn3pVm87+ZI8aXHLaRHWuaF 92iHxeeDkPT/f06BbT2B8AJehzguLWLkH8vq3MNktdKMOqg0WjzDp7JFovhy2mRZ1sOVeJBF8vtXA FG2t6LE5Qp4EWLTUk1UxVl/wNUKbHDvwV6/6TqibUalfHcl4n4nJUIAwZZK0CHhDXZrc/JjAma9eS hCkUxXhQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wN9WY-00000002hSa-46zo; Wed, 13 May 2026 13:21:18 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wN9WK-00000002hA3-01RN for linux-arm-kernel@lists.infradead.org; Wed, 13 May 2026 13:21:17 +0000 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 8F175307A; Wed, 13 May 2026 06:20:57 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.68.187]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C6B603F836; Wed, 13 May 2026 06:20:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1778678462; bh=E5yrfOjHbTgtrREgKY3VzeHkUo99UvFax7ztxEbuVC4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D/RCgtcUoGS6/6+c0IylGW0wDii5p+CbrPCANi6zbYJIFEfo+WZgC/9bohLtSYJ5j b29ixZWF6g4rQ5E+O+hbszY/smqiZKbS28X4+hpCbui6baaEFexIzLA2EqXsMaXaS8 kePhsGCpJV5dY0dQNqWE5uVH3Rec6Me1eXbGz99Y= 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 , WeiLin.Chang@arm.com, Lorenzo.Pieralisi2@arm.com Subject: [PATCH v14 30/44] KVM: arm64: Handle realm VCPU load Date: Wed, 13 May 2026 14:17:38 +0100 Message-ID: <20260513131757.116630-31-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260513131757.116630-1-steven.price@arm.com> References: <20260513131757.116630-1-steven.price@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260513_062104_089570_B8E39B7E X-CRM114-Status: UNSURE ( 9.08 ) X-CRM114-Notice: Please train this message. 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 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 073ba9181da9..495082e601a9 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -702,7 +702,7 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) struct kvm_s2_mmu *mmu; int *last_ran; - if (is_protected_kvm_enabled()) + if (is_protected_kvm_enabled() || kvm_is_realm(vcpu->kvm)) goto nommu; if (vcpu_has_nv(vcpu)) @@ -746,12 +746,6 @@ 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); if (kvm_vcpu_should_clear_twe(vcpu)) vcpu->arch.hcr_el2 &= ~HCR_TWE; @@ -773,6 +767,17 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) &vcpu->arch.vgic_cpu.vgic_v3); } + /* 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); -- 2.43.0