From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-251.mta1.migadu.com (out-251.mta1.migadu.com [95.215.58.251]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 73B62813 for ; Sat, 11 Feb 2023 01:47:26 +0000 (UTC) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1676079494; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=uYKcrnYt5tqTigyH3lLK4W3VAbMxWX7++cvj3eUL8OA=; b=lOAAqD0vQEau104DxzBl5UeQ5ic6uEJOS06NzyWZhUFdOZriFHXvb22Avzooyb0wMOImdw jK7Ggub1wCbPfbnf8wy8rMiqwS75DFADbWLPPD29XXWByPC2g/9F5QBNcMoSKUgNg8Vr4y 3YXNoB8WemcB7I6oGfgHWsTFrQCbu4k= From: Oliver Upton To: Marc Zyngier Cc: James Morse , Suzuki K Poulose , kvmarm@lists.linux.dev, Akihiko Odaki , Zenghui Yu , Raghavendra Rao Ananta , linux-arm-kernel@lists.infradead.org, Salil Mehta , Oliver Upton Subject: [RFC PATCH v2 2/6] KVM: arm64: Add vm fd device attribute accessors Date: Sat, 11 Feb 2023 01:37:55 +0000 Message-Id: <20230211013759.3556016-3-oliver.upton@linux.dev> In-Reply-To: <20230211013759.3556016-1-oliver.upton@linux.dev> References: <20230211013759.3556016-1-oliver.upton@linux.dev> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT A subsequent change will allow userspace to convey a filter for hypercalls through a vm device attribute. Add the requisite boilerplate for vm attribute accessors. Signed-off-by: Oliver Upton --- arch/arm64/kvm/arm.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 9c5573bc4614..09efa893e03a 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1449,11 +1449,28 @@ static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, } } +static int kvm_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) +{ + switch (attr->group) { + default: + return -ENXIO; + } +} + +static int kvm_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) +{ + switch (attr->group) { + default: + return -ENXIO; + } +} + long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct kvm *kvm = filp->private_data; void __user *argp = (void __user *)arg; + struct kvm_device_attr attr; switch (ioctl) { case KVM_CREATE_IRQCHIP: { @@ -1489,6 +1506,18 @@ long kvm_arch_vm_ioctl(struct file *filp, return -EFAULT; return kvm_vm_ioctl_mte_copy_tags(kvm, ©_tags); } + case KVM_HAS_DEVICE_ATTR: { + if (copy_from_user(&attr, argp, sizeof(attr))) + return -EFAULT; + + return kvm_vm_has_attr(kvm, &attr); + } + case KVM_SET_DEVICE_ATTR: { + if (copy_from_user(&attr, argp, sizeof(attr))) + return -EFAULT; + + return kvm_vm_set_attr(kvm, &attr); + } default: return -EINVAL; } -- 2.39.1.581.gbfd45094c4-goog