From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S939672AbdAIG0D (ORCPT ); Mon, 9 Jan 2017 01:26:03 -0500 Received: from outprodmail01.cc.columbia.edu ([128.59.72.39]:38011 "EHLO outprodmail01.cc.columbia.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S939371AbdAIGZm (ORCPT ); Mon, 9 Jan 2017 01:25:42 -0500 From: Jintack Lim To: christoffer.dall@linaro.org, marc.zyngier@arm.com, pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk, catalin.marinas@arm.com, will.deacon@arm.com, vladimir.murzin@arm.com, suzuki.poulose@arm.com, mark.rutland@arm.com, james.morse@arm.com, lorenzo.pieralisi@arm.com, kevin.brodsky@arm.com, wcohen@redhat.com, shankerd@codeaurora.org, geoff@infradead.org, andre.przywara@arm.com, eric.auger@redhat.com, anna-maria@linutronix.de, shihwei@cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: jintack@cs.columbia.edu Subject: [RFC 08/55] KVM: arm64: Set virtual EL2 context depending on the guest exception level Date: Mon, 9 Jan 2017 01:24:04 -0500 Message-Id: <1483943091-1364-9-git-send-email-jintack@cs.columbia.edu> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1483943091-1364-1-git-send-email-jintack@cs.columbia.edu> References: <1483943091-1364-1-git-send-email-jintack@cs.columbia.edu> X-No-Spam-Score: Local Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christoffer Dall Set up virutal EL2 context to hardware if the guest exception level is EL2. Signed-off-by: Christoffer Dall Signed-off-by: Jintack Lim --- arch/arm64/kvm/context.c | 32 ++++++++++++++++++++++++++------ 1 file changed, 26 insertions(+), 6 deletions(-) diff --git a/arch/arm64/kvm/context.c b/arch/arm64/kvm/context.c index 320afc6..acb4b1e 100644 --- a/arch/arm64/kvm/context.c +++ b/arch/arm64/kvm/context.c @@ -25,10 +25,25 @@ void kvm_arm_setup_shadow_state(struct kvm_vcpu *vcpu) { struct kvm_cpu_context *ctxt = &vcpu->arch.ctxt; + if (unlikely(vcpu_mode_el2(vcpu))) { + ctxt->hw_pstate = *vcpu_cpsr(vcpu) & ~PSR_MODE_MASK; - ctxt->hw_pstate = *vcpu_cpsr(vcpu); - ctxt->hw_sys_regs = ctxt->sys_regs; - ctxt->hw_sp_el1 = ctxt->gp_regs.sp_el1; + /* + * We emulate virtual EL2 mode in hardware EL1 mode using the + * same stack pointer mode as the guest expects. + */ + if ((*vcpu_cpsr(vcpu) & PSR_MODE_MASK) == PSR_MODE_EL2h) + ctxt->hw_pstate |= PSR_MODE_EL1h; + else + ctxt->hw_pstate |= PSR_MODE_EL1t; + + ctxt->hw_sys_regs = ctxt->shadow_sys_regs; + ctxt->hw_sp_el1 = ctxt->el2_regs[SP_EL2]; + } else { + ctxt->hw_pstate = *vcpu_cpsr(vcpu); + ctxt->hw_sys_regs = ctxt->sys_regs; + ctxt->hw_sp_el1 = ctxt->gp_regs.sp_el1; + } } /** @@ -38,9 +53,14 @@ void kvm_arm_setup_shadow_state(struct kvm_vcpu *vcpu) void kvm_arm_restore_shadow_state(struct kvm_vcpu *vcpu) { struct kvm_cpu_context *ctxt = &vcpu->arch.ctxt; - - *vcpu_cpsr(vcpu) = ctxt->hw_pstate; - ctxt->gp_regs.sp_el1 = ctxt->hw_sp_el1; + if (unlikely(vcpu_mode_el2(vcpu))) { + *vcpu_cpsr(vcpu) &= PSR_MODE_MASK; + *vcpu_cpsr(vcpu) |= ctxt->hw_pstate & ~PSR_MODE_MASK; + ctxt->el2_regs[SP_EL2] = ctxt->hw_sp_el1; + } else { + *vcpu_cpsr(vcpu) = ctxt->hw_pstate; + ctxt->gp_regs.sp_el1 = ctxt->hw_sp_el1; + } } void kvm_arm_init_cpu_context(kvm_cpu_context_t *cpu_ctxt) -- 1.9.1