From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jintack Lim Subject: [RFC PATCH v2 04/38] KVM: arm/arm64: Check if nested virtualization is in use Date: Tue, 18 Jul 2017 11:58:30 -0500 Message-ID: <1500397144-16232-5-git-send-email-jintack.lim@linaro.org> References: <1500397144-16232-1-git-send-email-jintack.lim@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1199D412A2 for ; Tue, 18 Jul 2017 12:58:55 -0400 (EDT) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UWGrUChgU4Fc for ; Tue, 18 Jul 2017 12:58:54 -0400 (EDT) Received: from mail-io0-f180.google.com (mail-io0-f180.google.com [209.85.223.180]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 3DE1049C0E for ; Tue, 18 Jul 2017 12:58:52 -0400 (EDT) Received: by mail-io0-f180.google.com with SMTP id l7so10046815iof.1 for ; Tue, 18 Jul 2017 09:59:41 -0700 (PDT) In-Reply-To: <1500397144-16232-1-git-send-email-jintack.lim@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: kvmarm@lists.cs.columbia.edu, christoffer.dall@linaro.org, marc.zyngier@arm.com Cc: kvm@vger.kernel.org, david.daney@cavium.com, catalin.marinas@arm.com, will.deacon@arm.com, stefan@hello-penguin.com, corbet@lwn.net, daniel.lezcano@linaro.org, linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org, andy.gross@linaro.org, cov@codeaurora.org, wcohen@redhat.com, mchehab@kernel.org, ard.biesheuvel@linaro.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, pbonzini@redhat.com, akpm@linux-foundation.org List-Id: kvmarm@lists.cs.columbia.edu Nested virtualizaion is in use only if all three conditions are met: - The architecture supports nested virtualization. - The kernel parameter is set. - The userspace uses nested virtualiztion feature. Signed-off-by: Jintack Lim --- arch/arm/include/asm/kvm_host.h | 11 +++++++++++ arch/arm64/include/asm/kvm_host.h | 2 ++ arch/arm64/kvm/nested.c | 17 +++++++++++++++++ virt/kvm/arm/arm.c | 4 ++++ 4 files changed, 34 insertions(+) diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 00b0f97..7e9e6c8 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -303,4 +303,15 @@ static inline int __init kvmarm_nested_cfg(char *buf) { return 0; } + +static inline int init_nested_virt(void) +{ + return 0; +} + +static inline bool nested_virt_in_use(struct kvm_vcpu *vcpu) +{ + return false; +} + #endif /* __ARM_KVM_HOST_H__ */ diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 6df0c7c..86d4b6c 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -387,5 +387,7 @@ static inline void __cpu_init_stage2(void) } int __init kvmarm_nested_cfg(char *buf); +int init_nested_virt(void); +bool nested_virt_in_use(struct kvm_vcpu *vcpu); #endif /* __ARM64_KVM_HOST_H__ */ diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index 79f38da..9a05c76 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -24,3 +24,20 @@ int __init kvmarm_nested_cfg(char *buf) { return strtobool(buf, &nested_param); } + +int init_nested_virt(void) +{ + if (nested_param && cpus_have_const_cap(ARM64_HAS_NESTED_VIRT)) + kvm_info("Nested virtualization is supported\n"); + + return 0; +} + +bool nested_virt_in_use(struct kvm_vcpu *vcpu) +{ + if (nested_param && cpus_have_const_cap(ARM64_HAS_NESTED_VIRT) + && test_bit(KVM_ARM_VCPU_NESTED_VIRT, vcpu->arch.features)) + return true; + + return false; +} diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index 1c1c772..36aae3a 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -1478,6 +1478,10 @@ int kvm_arch_init(void *opaque) if (err) goto out_err; + err = init_nested_virt(); + if (err) + return err; + err = init_subsystems(); if (err) goto out_hyp; -- 1.9.1