From patchwork Tue Jan 8 18:41:37 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoffer Dall X-Patchwork-Id: 1947571 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 87597DF23A for ; Tue, 8 Jan 2013 18:53:04 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TseDr-0001ZJ-1R; Tue, 08 Jan 2013 18:48:28 +0000 Received: from mail-vb0-f49.google.com ([209.85.212.49]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1Tse7I-0006HI-Jd for linux-arm-kernel@lists.infradead.org; Tue, 08 Jan 2013 18:41:44 +0000 Received: by mail-vb0-f49.google.com with SMTP id r6so731349vbi.36 for ; Tue, 08 Jan 2013 10:41:39 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:subject:to:from:cc:date:message-id:in-reply-to :references:user-agent:mime-version:content-type :content-transfer-encoding:x-gm-message-state; bh=hU1NirwJnV36pUoLj3RQMdAxdabZz9XtWhUZRvw2ezY=; b=PR2jbYrBxOf5M03OvLyfbQ0gH45B34gpRU5F/FV+bhSdLnKEkr/euIpVc62XD8cK2M EU2TMfQbNJAeqLnCzy5NX5frnwl7KUJQxJVMpzkM3lc2XTrWdd5CF8oVE4noTLEtTWdS BEpd8SXfj/a5AfyD8ce+sr9/zSuKf6M7Au4MouWE0x8rTCJRAmnwFDMs/6+RV0T/JHp/ olLwo7OoRWKRv/YA1JZ1TysbkHwjKSODug2BoOyS9KfLEgp5s7FhFk7ZF2GKryWT3RAi DUeLksr4fKQL5TuFBpAAQbiItHR/1CASVP0hxofup8azf4xcFE3f120HNh2kXB6AHJSZ lFMQ== X-Received: by 10.52.175.163 with SMTP id cb3mr76053899vdc.76.1357670499136; Tue, 08 Jan 2013 10:41:39 -0800 (PST) Received: from [127.0.1.1] (pool-72-80-83-148.nycmny.fios.verizon.net. [72.80.83.148]) by mx.google.com with ESMTPS id l8sm54262290vdh.8.2013.01.08.10.41.38 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 08 Jan 2013 10:41:38 -0800 (PST) Subject: [PATCH v5 02/12] ARM: KVM: Keep track of currently running vcpus To: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu From: Christoffer Dall Date: Tue, 08 Jan 2013 13:41:37 -0500 Message-ID: <20130108184137.46558.19414.stgit@ubuntu> In-Reply-To: <20130108184116.46558.3558.stgit@ubuntu> References: <20130108184116.46558.3558.stgit@ubuntu> User-Agent: StGit/0.15 MIME-Version: 1.0 X-Gm-Message-State: ALoCoQmSsCewW9OeEgR514wxZPS00YtHhm/ZrZgIJnySaLh2GZqJQr+GK+mjrabc9Tqf+CQS4aQq X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130108_134141_809630_E4337A3C X-CRM114-Status: GOOD ( 15.29 ) X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.212.49 listed in list.dnswl.org] -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Marc Zyngier X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Marc Zyngier When an interrupt occurs for the guest, it is sometimes necessary to find out which vcpu was running at that point. Keep track of which vcpu is being run in kvm_arch_vcpu_ioctl_run(), and allow the data to be retrieved using either: - kvm_arm_get_running_vcpu(): returns the vcpu running at this point on the current CPU. Can only be used in a non-preemptible context. - kvm_arm_get_running_vcpus(): returns the per-CPU variable holding the running vcpus, usable for per-CPU interrupts. Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall --- arch/arm/include/asm/kvm_host.h | 10 ++++++++++ arch/arm/kvm/arm.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index ca40795..7a9f1d5 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -155,4 +155,14 @@ static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) { return 0; } + +struct kvm_vcpu *kvm_arm_get_running_vcpu(void); +struct kvm_vcpu __percpu **kvm_get_running_vcpus(void); + +int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices); +unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu); +struct kvm_one_reg; +int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *); +int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *); + #endif /* __ARM_KVM_HOST_H__ */ diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 2f39b04..5180f7b 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -53,11 +53,38 @@ static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); static struct vfp_hard_struct __percpu *kvm_host_vfp_state; static unsigned long hyp_default_vectors; +/* Per-CPU variable containing the currently running vcpu. */ +static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu); + /* The VMID used in the VTTBR */ static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); static u8 kvm_next_vmid; static DEFINE_SPINLOCK(kvm_vmid_lock); +static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu) +{ + BUG_ON(preemptible()); + __get_cpu_var(kvm_arm_running_vcpu) = vcpu; +} + +/** + * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU. + * Must be called from non-preemptible context + */ +struct kvm_vcpu *kvm_arm_get_running_vcpu(void) +{ + BUG_ON(preemptible()); + return __get_cpu_var(kvm_arm_running_vcpu); +} + +/** + * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus. + */ +struct kvm_vcpu __percpu **kvm_get_running_vcpus(void) +{ + return &kvm_arm_running_vcpu; +} + int kvm_arch_hardware_enable(void *garbage) { return 0; @@ -310,10 +337,13 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) cpumask_clear_cpu(cpu, &vcpu->arch.require_dcache_flush); flush_cache_all(); /* We'd really want v7_flush_dcache_all() */ } + + kvm_arm_set_running_vcpu(vcpu); } void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { + kvm_arm_set_running_vcpu(NULL); } int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,