From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F06DCC3A59E for ; Wed, 21 Aug 2019 15:38:58 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C2DEC22DA7 for ; Wed, 21 Aug 2019 15:38:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="mFHw9tPO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C2DEC22DA7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=bPEs7GqMxxbgHUY0Q3g9+MxgGJMWf1YTKEWUe61geUI=; b=mFHw9tPOA5O5Fl 68G4JWF/qeNvLFaNRm9i+pzcEkt5lL5y1KMTB1enCu9ZLgxHY6Q3OEFE/ljNzXmmVBRNwSBpWjf0y d5HLRXhduCTwBF4g11H8Rn2z7U6HdyikNGoJOa+7flAk7xYe1Khry9qUs9w+2MyBIwnDn5hdUO/Uc n/gTQNyg3YQB0hNTjNY0obgM37fCfb0G6WhFVLYd5zn0sSkjuiPrC3VPlNXvaUQvta26raIhGm88G BnVJmdZhUh6g7mAcbunEvVF9YU6leWntl3lovBT+B65pTk0EUW6QW2YD1akPc6TcOqKYyYuSDUN1l ia2o9Dq2pBfQq8lJ+1ww==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i0ShO-0000zy-AD; Wed, 21 Aug 2019 15:38:58 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i0Sfx-0007eT-KX for linux-arm-kernel@lists.infradead.org; Wed, 21 Aug 2019 15:37:31 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3829C1596; Wed, 21 Aug 2019 08:37:29 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.133]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 366A03F718; Wed, 21 Aug 2019 08:37:27 -0700 (PDT) From: Steven Price To: Marc Zyngier , Will Deacon , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Subject: [PATCH v3 07/10] KVM: arm64: Provide a PV_TIME device to user space Date: Wed, 21 Aug 2019 16:36:53 +0100 Message-Id: <20190821153656.33429-8-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190821153656.33429-1-steven.price@arm.com> References: <20190821153656.33429-1-steven.price@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190821_083729_798579_94EF34D9 X-CRM114-Status: GOOD ( 16.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Catalin Marinas , Suzuki K Pouloze , linux-doc@vger.kernel.org, Russell King , Steven Price , James Morse , Paolo Bonzini , Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Allow user space to inform the KVM host where in the physical memory map the paravirtualized time structures should be located. A device is created which provides the base address of an array of Stolen Time (ST) structures, one for each VCPU. There must be (64 * total number of VCPUs) bytes of memory available at this location. The address is given in terms of the physical address visible to the guest and must be page aligned. The guest will discover the address via a hypercall. Signed-off-by: Steven Price --- arch/arm/include/asm/kvm_host.h | 4 ++ arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/include/uapi/asm/kvm.h | 8 +++ include/uapi/linux/kvm.h | 2 + virt/kvm/arm/arm.c | 1 + virt/kvm/arm/pvtime.c | 94 +++++++++++++++++++++++++++++++ 6 files changed, 110 insertions(+) diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 47d2ced99421..b6c8dbc0556b 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -325,6 +325,10 @@ static inline int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext) int kvm_perf_init(void); int kvm_perf_teardown(void); +static inline void kvm_pvtime_init(void) +{ +} + static inline int kvm_hypercall_pv_features(struct kvm_vcpu *vcpu) { return SMCCC_RET_NOT_SUPPORTED; diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index b6fa7beffd8a..7b2147f62c16 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -489,6 +489,7 @@ void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run, int kvm_perf_init(void); int kvm_perf_teardown(void); +void kvm_pvtime_init(void); int kvm_hypercall_pv_features(struct kvm_vcpu *vcpu); int kvm_hypercall_stolen_time(struct kvm_vcpu *vcpu); int kvm_update_stolen_time(struct kvm_vcpu *vcpu, bool init); diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 9a507716ae2f..209c4de67306 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -367,6 +367,14 @@ struct kvm_vcpu_events { #define KVM_PSCI_RET_INVAL PSCI_RET_INVALID_PARAMS #define KVM_PSCI_RET_DENIED PSCI_RET_DENIED +/* Device Control API: PV_TIME */ +#define KVM_DEV_ARM_PV_TIME_REGION 0 +#define KVM_DEV_ARM_PV_TIME_ST 0 +struct kvm_dev_arm_st_region { + __u64 gpa; + __u64 size; +}; + #endif #endif /* __ARM_KVM_H__ */ diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 5e3f12d5359e..265156a984f2 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1222,6 +1222,8 @@ enum kvm_device_type { #define KVM_DEV_TYPE_ARM_VGIC_ITS KVM_DEV_TYPE_ARM_VGIC_ITS KVM_DEV_TYPE_XIVE, #define KVM_DEV_TYPE_XIVE KVM_DEV_TYPE_XIVE + KVM_DEV_TYPE_ARM_PV_TIME, +#define KVM_DEV_TYPE_ARM_PV_TIME KVM_DEV_TYPE_ARM_PV_TIME KVM_DEV_TYPE_MAX, }; diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index 5e8343e2dd62..bfb5a842e6ab 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -1494,6 +1494,7 @@ static int init_subsystems(void) kvm_perf_init(); kvm_coproc_table_init(); + kvm_pvtime_init(); out: on_each_cpu(_kvm_arch_hardware_disable, NULL, 1); diff --git a/virt/kvm/arm/pvtime.c b/virt/kvm/arm/pvtime.c index 28603689f6e0..3e55c1fb6a49 100644 --- a/virt/kvm/arm/pvtime.c +++ b/virt/kvm/arm/pvtime.c @@ -2,7 +2,9 @@ // Copyright (C) 2019 Arm Ltd. #include +#include +#include #include #include @@ -86,3 +88,95 @@ int kvm_hypercall_stolen_time(struct kvm_vcpu *vcpu) return ret; } + +static int kvm_arm_pvtime_create(struct kvm_device *dev, u32 type) +{ + return 0; +} + +static void kvm_arm_pvtime_destroy(struct kvm_device *dev) +{ + struct kvm_arch_pvtime *pvtime = &dev->kvm->arch.pvtime; + + pvtime->st_base = GPA_INVALID; + kfree(dev); +} + +static int kvm_arm_pvtime_set_attr(struct kvm_device *dev, + struct kvm_device_attr *attr) +{ + struct kvm *kvm = dev->kvm; + struct kvm_arch_pvtime *pvtime = &kvm->arch.pvtime; + u64 __user *user = (u64 __user *)attr->addr; + struct kvm_dev_arm_st_region region; + + switch (attr->group) { + case KVM_DEV_ARM_PV_TIME_REGION: + if (copy_from_user(®ion, user, sizeof(region))) + return -EFAULT; + if (region.gpa & ~PAGE_MASK) + return -EINVAL; + if (region.size & ~PAGE_MASK) + return -EINVAL; + switch (attr->attr) { + case KVM_DEV_ARM_PV_TIME_ST: + if (pvtime->st_base != GPA_INVALID) + return -EEXIST; + pvtime->st_base = region.gpa; + pvtime->st_size = region.size; + return 0; + } + break; + } + return -ENXIO; +} + +static int kvm_arm_pvtime_get_attr(struct kvm_device *dev, + struct kvm_device_attr *attr) +{ + struct kvm_arch_pvtime *pvtime = &dev->kvm->arch.pvtime; + u64 __user *user = (u64 __user *)attr->addr; + struct kvm_dev_arm_st_region region; + + switch (attr->group) { + case KVM_DEV_ARM_PV_TIME_REGION: + switch (attr->attr) { + case KVM_DEV_ARM_PV_TIME_ST: + region.gpa = pvtime->st_base; + region.size = pvtime->st_size; + if (copy_to_user(user, ®ion, sizeof(region))) + return -EFAULT; + return 0; + } + break; + } + return -ENXIO; +} + +static int kvm_arm_pvtime_has_attr(struct kvm_device *dev, + struct kvm_device_attr *attr) +{ + switch (attr->group) { + case KVM_DEV_ARM_PV_TIME_REGION: + switch (attr->attr) { + case KVM_DEV_ARM_PV_TIME_ST: + return 0; + } + break; + } + return -ENXIO; +} + +static const struct kvm_device_ops pvtime_ops = { + "Arm PV time", + .create = kvm_arm_pvtime_create, + .destroy = kvm_arm_pvtime_destroy, + .set_attr = kvm_arm_pvtime_set_attr, + .get_attr = kvm_arm_pvtime_get_attr, + .has_attr = kvm_arm_pvtime_has_attr +}; + +void kvm_pvtime_init(void) +{ + kvm_register_device_ops(&pvtime_ops, KVM_DEV_TYPE_ARM_PV_TIME); +} -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel