Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752228AbdGRRMT (ORCPT ); Tue, 18 Jul 2017 13:12:19 -0400 Received: from mail-io0-f172.google.com ([209.85.223.172]:36257 "EHLO mail-io0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751901AbdGRQ7p (ORCPT ); Tue, 18 Jul 2017 12:59:45 -0400 From: Jintack Lim To: kvmarm@lists.cs.columbia.edu, christoffer.dall@linaro.org, marc.zyngier@arm.com Cc: corbet@lwn.net, pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk, catalin.marinas@arm.com, will.deacon@arm.com, akpm@linux-foundation.org, mchehab@kernel.org, cov@codeaurora.org, daniel.lezcano@linaro.org, david.daney@cavium.com, mark.rutland@arm.com, suzuki.poulose@arm.com, stefan@hello-penguin.com, andy.gross@linaro.org, wcohen@redhat.com, ard.biesheuvel@linaro.org, shankerd@codeaurora.org, vladimir.murzin@arm.com, james.morse@arm.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH v2 06/38] KVM: arm64: Add vcpu_mode_el2 primitive to support nesting Date: Tue, 18 Jul 2017 11:58:32 -0500 Message-Id: <1500397144-16232-7-git-send-email-jintack.lim@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1500397144-16232-1-git-send-email-jintack.lim@linaro.org> References: <1500397144-16232-1-git-send-email-jintack.lim@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1633 Lines: 54 From: Christoffer Dall When running a nested hypervisor we occasionally have to figure out if the mode we are switching into is the virtual EL2 mode or a regular EL0/1 mode. Signed-off-by: Christoffer Dall --- arch/arm/include/asm/kvm_emulate.h | 6 ++++++ arch/arm64/include/asm/kvm_emulate.h | 12 ++++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h index 9a8a45a..399cd75e 100644 --- a/arch/arm/include/asm/kvm_emulate.h +++ b/arch/arm/include/asm/kvm_emulate.h @@ -77,6 +77,12 @@ static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu) return 1; } +/* We don't support nesting on arm */ +static inline bool vcpu_mode_el2(const struct kvm_vcpu *vcpu) +{ + return false; +} + static inline unsigned long *vcpu_pc(struct kvm_vcpu *vcpu) { return &vcpu->arch.ctxt.gp_regs.usr_regs.ARM_pc; diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h index fe39e68..5d6f3d0 100644 --- a/arch/arm64/include/asm/kvm_emulate.h +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -143,6 +143,18 @@ static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu) return mode != PSR_MODE_EL0t; } +static inline bool vcpu_mode_el2(const struct kvm_vcpu *vcpu) +{ + u32 mode; + + if (vcpu_mode_is_32bit(vcpu)) + return false; + + mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK; + + return mode == PSR_MODE_EL2h || mode == PSR_MODE_EL2t; +} + static inline u32 kvm_vcpu_get_hsr(const struct kvm_vcpu *vcpu) { return vcpu->arch.fault.esr_el2; -- 1.9.1