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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 7682AC433EF for ; Wed, 6 Jul 2022 17:17:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=rTOQUYjDyrrygxkEV+FuB2+cz5s2IobKo6f+RAS86Is=; b=s7j3nP2H6+lZGn 4I4ueZwkFwlFs8TC6wElL5xGLjynqECHjWn2R/F3gWzaRLxF0zyoeKRSgqLdiX9eJd4Rx7v03IG2L XuB1C1TPU/EmDGO9q2+52uI3sYQHRAdcP9Yu8aKKDcVoOojgKfVNX1RLiucDxJTG5FV09TD5mR0dq xzLyA6eVT/NtkW4wf1yjCTNHffHp3zstAi4eJcfIKpP3vUgx41v1GXTWfCa4Fqw0AYOj7GSq0+y/L Omzn5Wes+5r8DxfExlLW7rwBXdMmb2sW4F5/Sn0rt1KaTocxAn9X8npSQLt8h6VR6fOI4OWH94+vA OuBkKvJrZVQ9CcbD4Zew==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o98ct-00Be7U-Gy; Wed, 06 Jul 2022 17:15:48 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o98Sr-00BZn5-As for linux-arm-kernel@lists.infradead.org; Wed, 06 Jul 2022 17:05:27 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D994561E42; Wed, 6 Jul 2022 17:05:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4AACDC341CE; Wed, 6 Jul 2022 17:05:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1657127124; bh=SzPjuICUXJCvp7Vyuk4xgoPaa1J68WeSY55X5c3s7E4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mNmdlYOPGWqMPt6F0RNswucx/WjxxHsiS7b6Vrmn7juUr+L1KYydfabS7maWs72TH ShptmKAtYryxigs0+2TE2+SqHz3I5QYtpOo2Vc4oO6lylpkYgCAH2+lDXubdkk8ssA CUWa0M1BxY21VES/03yqMbTEQyReLBKU/slhFZDml9kVnJY86qoThEYWULoCkwdRUy TSFrRrEWcppu1sx6n0bf+AXTy8riBDvz6oIyKgSRw0RydO19w+QpmSHHYYIF6l4uDe NX9Addy1mDAxSpo8ho9Gki0VjHwfX51LPTi/YTBKsSo64K8O1QQnw4laDpf+TPOfxY iLwRDlMMP2XKA== Received: from sofa.misterjones.org ([185.219.108.64] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1o987N-005h9i-G0; Wed, 06 Jul 2022 17:43:13 +0100 From: Marc Zyngier To: kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: James Morse , Suzuki K Poulose , Alexandru Elisei , Oliver Upton , Schspa Shi , kernel-team@android.com Subject: [PATCH 13/19] KVM: arm64: vgic-v2: Consolidate userspace access for MMIO registers Date: Wed, 6 Jul 2022 17:42:58 +0100 Message-Id: <20220706164304.1582687-14-maz@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220706164304.1582687-1-maz@kernel.org> References: <20220706164304.1582687-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, james.morse@arm.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, oliver.upton@linux.dev, schspa@gmail.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220706_100525_561550_23E27578 X-CRM114-Status: GOOD ( 14.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Align the GICv2 MMIO accesses from userspace with the way the GICv3 code is now structured. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/vgic/vgic-kvm-device.c | 40 ++++++++++++--------------- 1 file changed, 18 insertions(+), 22 deletions(-) diff --git a/arch/arm64/kvm/vgic/vgic-kvm-device.c b/arch/arm64/kvm/vgic/vgic-kvm-device.c index 925875722027..ddead333c232 100644 --- a/arch/arm64/kvm/vgic/vgic-kvm-device.c +++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c @@ -348,17 +348,18 @@ bool lock_all_vcpus(struct kvm *kvm) * * @dev: kvm device handle * @attr: kvm device attribute - * @reg: address the value is read or written * @is_write: true if userspace is writing a register */ static int vgic_v2_attr_regs_access(struct kvm_device *dev, struct kvm_device_attr *attr, - u32 *reg, bool is_write) + bool is_write) { + u32 __user *uaddr = (u32 __user *)(unsigned long)attr->addr; struct vgic_reg_attr reg_attr; gpa_t addr; struct kvm_vcpu *vcpu; int ret; + u32 val; ret = vgic_v2_parse_attr(dev, attr, ®_attr); if (ret) @@ -367,6 +368,10 @@ static int vgic_v2_attr_regs_access(struct kvm_device *dev, vcpu = reg_attr.vcpu; addr = reg_attr.addr; + if (is_write) + if (get_user(val, uaddr)) + return -EFAULT; + mutex_lock(&dev->kvm->lock); ret = vgic_init(dev->kvm); @@ -380,10 +385,10 @@ static int vgic_v2_attr_regs_access(struct kvm_device *dev, switch (attr->group) { case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: - ret = vgic_v2_cpuif_uaccess(vcpu, is_write, addr, reg); + ret = vgic_v2_cpuif_uaccess(vcpu, is_write, addr, &val); break; case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: - ret = vgic_v2_dist_uaccess(vcpu, is_write, addr, reg); + ret = vgic_v2_dist_uaccess(vcpu, is_write, addr, &val); break; default: ret = -EINVAL; @@ -393,6 +398,11 @@ static int vgic_v2_attr_regs_access(struct kvm_device *dev, unlock_all_vcpus(dev->kvm); out: mutex_unlock(&dev->kvm->lock); + + if (!ret && !is_write) + if (put_user(val, uaddr)) + ret = -EFAULT; + return ret; } @@ -407,15 +417,8 @@ static int vgic_v2_set_attr(struct kvm_device *dev, switch (attr->group) { case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: - case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: { - u32 __user *uaddr = (u32 __user *)(long)attr->addr; - u32 reg; - - if (get_user(reg, uaddr)) - return -EFAULT; - - return vgic_v2_attr_regs_access(dev, attr, ®, true); - } + case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: + return vgic_v2_attr_regs_access(dev, attr, true); } return -ENXIO; @@ -432,15 +435,8 @@ static int vgic_v2_get_attr(struct kvm_device *dev, switch (attr->group) { case KVM_DEV_ARM_VGIC_GRP_DIST_REGS: - case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: { - u32 __user *uaddr = (u32 __user *)(long)attr->addr; - u32 reg = 0; - - ret = vgic_v2_attr_regs_access(dev, attr, ®, false); - if (ret) - return ret; - return put_user(reg, uaddr); - } + case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: + return vgic_v2_attr_regs_access(dev, attr, false); } return -ENXIO; -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel