From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 419FB4ADDBC; Wed, 13 May 2026 13:21:03 +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=1778678464; cv=none; b=bDlCuwABQhVxpodwmJVlwm019VWAiaYwEejeiVsnIt2AqNl4cz9SZMZalq697GuHhho8NFAsnZBLN3zkYDGu/hg+8qN3w7deZXcCNxZht71pmhmh6l5+gSFvpn/cHPtlnzaJMxw8pVPRmgmCeN3x/AzjrMlftwtxXvLMCqka848= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778678464; c=relaxed/simple; bh=E5yrfOjHbTgtrREgKY3VzeHkUo99UvFax7ztxEbuVC4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PzRDh7yvUdtGE5KmLp4qLXotAj9tp/DX3RI/FLkyUYz/GjsC2YJBotO40WfapAvd2cJONYLrhmQXJXwe2DEoTHTO4wcMW4EnpW6uWWGis+sOf3srRpFWotnnVRHUJOMA/1FtvV/JYx/ojp4+sDUZtFvhMY+PGYbvlYTuE4Kj/nw= 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; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=D/RCgtcU; 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="D/RCgtcU" 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> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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