From patchwork Mon Nov 25 15:49:59 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 3233011 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 755599F3A0 for ; Mon, 25 Nov 2013 15:52:12 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9C3342011B for ; Mon, 25 Nov 2013 15:52:07 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2098C2012D for ; Mon, 25 Nov 2013 15:52:06 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VkyRW-0005Cw-0f; Mon, 25 Nov 2013 15:51:22 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VkyRL-0002u8-Fo; Mon, 25 Nov 2013 15:51:11 +0000 Received: from mail-pd0-f180.google.com ([209.85.192.180]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VkyR6-0002rF-TW for linux-arm-kernel@lists.infradead.org; Mon, 25 Nov 2013 15:50:58 +0000 Received: by mail-pd0-f180.google.com with SMTP id q10so5734552pdj.11 for ; Mon, 25 Nov 2013 07:50:35 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=EMjWs41JvSfykW7quSNr2CBWR4K1IPG/QpJe51dqZw0=; b=CSuEDOgTqAF6zrHisEx+MeWEsy9BVK1AMrhUcVaC0E3f0Gg6cT6H+HQJ4uZdYCGtmu z/5eBjs19m6p/qAeOhTHE1yPvrLJywUGVK6m1f1DaXzfomBA1AY73awmuIM/y+0cBvGk Q7jwaEOKiGRZByYfU3Mry9KORJJcxAdDLVFnOKVTyVsi169nUo10COr7HX4oI/2GHwGv MmvKJ7T4qcSXqEf1pPiVe1qe9ESUQmWvmJUrvxQ+92+mn7EKXusxTIsWL9FSg+ypaEv8 5HU9L++j5Q1XcC7MupNTaazpSOrRqLCG3SMtVAlQ7J6m9MOLTLo8RlX+hFuEvRKxJWPe GwnA== X-Gm-Message-State: ALoCoQmMsIIoi9tsOUx+S3tN/1rSOzVYbNUwYf64oO0csDQDqu/4YPcWKBaCBmiq9+hv/uXjwpON X-Received: by 10.68.190.136 with SMTP id gq8mr18635526pbc.68.1385394635194; Mon, 25 Nov 2013 07:50:35 -0800 (PST) Received: from pnqlab006.amcc.com ([182.73.239.130]) by mx.google.com with ESMTPSA id e6sm6039746pbg.4.2013.11.25.07.50.30 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 25 Nov 2013 07:50:34 -0800 (PST) From: Anup Patel To: kvmarm@lists.cs.columbia.edu Subject: [PATCH 2/2] ARM/ARM64: KVM: Forward PSCI SYSTEM_OFF and SYSTEM_RESET to user space Date: Mon, 25 Nov 2013 21:19:59 +0530 Message-Id: <1385394599-15439-3-git-send-email-anup.patel@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1385394599-15439-1-git-send-email-anup.patel@linaro.org> References: <1385394599-15439-1-git-send-email-anup.patel@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131125_105057_124099_507B0449 X-CRM114-Status: GOOD ( 18.31 ) X-Spam-Score: -1.9 (-) Cc: linaro-kernel@lists.linaro.org, Anup Patel , patches@linaro.org, Marc Zyngier , patches@apm.com, linux-arm-kernel@lists.infradead.org, Christoffer Dall , Pranavkumar Sawargaonkar X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The PSCI SYSTEM_OFF and SYSTEM_RESET functions are system-level functions hence cannot be fully emulated by the in-kernel PSCI emulation code. To tackle this, we forward PSCI SYSTEM_OFF and SYSTEM_RESET function calls from guest to user space (i.e. QEMU or KVMTOOL) via KVM run structure using KVM_EXIT_SHUTDOWN and KVM_EXIT_RESET exit reasons. Signed-off-by: Anup Patel Signed-off-by: Pranavkumar Sawargaonkar --- arch/arm/include/asm/kvm_psci.h | 2 +- arch/arm/include/uapi/asm/kvm.h | 2 ++ arch/arm/kvm/handle_exit.c | 7 ++++++- arch/arm/kvm/psci.c | 38 +++++++++++++++++++++++++++++-------- arch/arm64/include/asm/kvm_psci.h | 2 +- arch/arm64/include/uapi/asm/kvm.h | 2 ++ arch/arm64/kvm/handle_exit.c | 10 ++++++---- 7 files changed, 48 insertions(+), 15 deletions(-) diff --git a/arch/arm/include/asm/kvm_psci.h b/arch/arm/include/asm/kvm_psci.h index 9a83d98..992d7f1 100644 --- a/arch/arm/include/asm/kvm_psci.h +++ b/arch/arm/include/asm/kvm_psci.h @@ -18,6 +18,6 @@ #ifndef __ARM_KVM_PSCI_H__ #define __ARM_KVM_PSCI_H__ -bool kvm_psci_call(struct kvm_vcpu *vcpu); +int kvm_psci_call(struct kvm_vcpu *vcpu); #endif /* __ARM_KVM_PSCI_H__ */ diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h index c498b60..f4de20c 100644 --- a/arch/arm/include/uapi/asm/kvm.h +++ b/arch/arm/include/uapi/asm/kvm.h @@ -172,6 +172,8 @@ struct kvm_arch_memory_slot { #define KVM_PSCI_FN_CPU_OFF KVM_PSCI_FN(1) #define KVM_PSCI_FN_CPU_ON KVM_PSCI_FN(2) #define KVM_PSCI_FN_MIGRATE KVM_PSCI_FN(3) +#define KVM_PSCI_FN_SYSTEM_OFF KVM_PSCI_FN(4) +#define KVM_PSCI_FN_SYSTEM_RESET KVM_PSCI_FN(5) #define KVM_PSCI_RET_SUCCESS 0 #define KVM_PSCI_RET_NI ((unsigned long)-1) diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c index a920790..c96c7e8 100644 --- a/arch/arm/kvm/handle_exit.c +++ b/arch/arm/kvm/handle_exit.c @@ -40,11 +40,16 @@ static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) { + int ret; + trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0), kvm_vcpu_hvc_get_imm(vcpu)); - if (kvm_psci_call(vcpu)) + ret = kvm_psci_call(vcpu); + if (ret == 0) return 1; + else if (ret > 0) + return 0; kvm_inject_undefined(vcpu); return 1; diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c index 0881bf1..c8d3fcd 100644 --- a/arch/arm/kvm/psci.c +++ b/arch/arm/kvm/psci.c @@ -84,18 +84,31 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu) return KVM_PSCI_RET_SUCCESS; } +static void kvm_psci_system_off(struct kvm_vcpu *vcpu) +{ + vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN; +} + +static void kvm_psci_system_reset(struct kvm_vcpu *vcpu) +{ + vcpu->run->exit_reason = KVM_EXIT_RESET; +} + /** * kvm_psci_call - handle PSCI call if r0 value is in range * @vcpu: Pointer to the VCPU struct * * Handle PSCI calls from guests through traps from HVC instructions. - * The calling convention is similar to SMC calls to the secure world where - * the function number is placed in r0 and this function returns true if the - * function number specified in r0 is withing the PSCI range, and false - * otherwise. + * The calling convention is similar to SMC calls to the secure world + * where the function number is placed in r0 and function number + * specified in r0 is withing the PSCI range. + * + * This function returns: 0 (success), > 0 (success but exit to user + * space), and < 0 (failure) */ -bool kvm_psci_call(struct kvm_vcpu *vcpu) +int kvm_psci_call(struct kvm_vcpu *vcpu) { + int ret = 0; unsigned long psci_fn = *vcpu_reg(vcpu, 0) & ~((u32) 0); unsigned long val; @@ -111,11 +124,20 @@ bool kvm_psci_call(struct kvm_vcpu *vcpu) case KVM_PSCI_FN_MIGRATE: val = KVM_PSCI_RET_NI; break; - + case KVM_PSCI_FN_SYSTEM_OFF: + kvm_psci_system_off(vcpu); + val = KVM_PSCI_RET_SUCCESS; + ret = 1; + break; + case KVM_PSCI_FN_SYSTEM_RESET: + kvm_psci_system_reset(vcpu); + val = KVM_PSCI_RET_SUCCESS; + ret = 1; + break; default: - return false; + return -EINVAL; } *vcpu_reg(vcpu, 0) = val; - return true; + return ret; } diff --git a/arch/arm64/include/asm/kvm_psci.h b/arch/arm64/include/asm/kvm_psci.h index e301a48..9bd0ee8 100644 --- a/arch/arm64/include/asm/kvm_psci.h +++ b/arch/arm64/include/asm/kvm_psci.h @@ -18,6 +18,6 @@ #ifndef __ARM64_KVM_PSCI_H__ #define __ARM64_KVM_PSCI_H__ -bool kvm_psci_call(struct kvm_vcpu *vcpu); +int kvm_psci_call(struct kvm_vcpu *vcpu); #endif /* __ARM64_KVM_PSCI_H__ */ diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index d9f026b..f678902 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -158,6 +158,8 @@ struct kvm_arch_memory_slot { #define KVM_PSCI_FN_CPU_OFF KVM_PSCI_FN(1) #define KVM_PSCI_FN_CPU_ON KVM_PSCI_FN(2) #define KVM_PSCI_FN_MIGRATE KVM_PSCI_FN(3) +#define KVM_PSCI_FN_SYSTEM_OFF KVM_PSCI_FN(4) +#define KVM_PSCI_FN_SYSTEM_RESET KVM_PSCI_FN(5) #define KVM_PSCI_RET_SUCCESS 0 #define KVM_PSCI_RET_NI ((unsigned long)-1) diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 8da5606..a5b5b6a 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -30,8 +30,13 @@ typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) { - if (kvm_psci_call(vcpu)) + int ret; + + ret = kvm_psci_call(vcpu); + if (ret == 0) return 1; + else if (ret > 0) + return 0; kvm_inject_undefined(vcpu); return 1; @@ -39,9 +44,6 @@ static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) { - if (kvm_psci_call(vcpu)) - return 1; - kvm_inject_undefined(vcpu); return 1; }