linux-kernel - [PATCH v4 14/15] s390: vfio-ap: implement VFIO_DEVICE_GET

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1523827345-11600-15-git-send-email-akrowiak@linux.vnet.ibm.com>
Date:   Sun, 15 Apr 2018 17:22:24 -0400
From:   Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        akrowiak@...ux.vnet.ibm.com
Subject: [PATCH v4 14/15] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl

Introduces ioctl access to the VFIO AP Matrix device driver
by implementing the VFIO_DEVICE_GET_INFO ioctl. This ioctl
provides the VFIO AP Matrix device driver information to the
guest machine.

Reviewed-by: Pierre Morel <pmorel@...ux.vnet.ibm.com>
Signed-off-by: Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
---
 drivers/s390/crypto/vfio_ap_ops.c |   43 +++++++++++++++++++++++++++++++++++++
 1 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index e3ff5ab..00179cd 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -101,6 +101,48 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev)
 				 &matrix_mdev->group_notifier);
 }
 
+static int vfio_ap_mdev_get_device_info(unsigned long arg)
+{
+	unsigned long minsz;
+	struct vfio_device_info info;
+
+	minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+	if (copy_from_user(&info, (void __user *)arg, minsz))
+		return -EFAULT;
+
+	if (info.argsz < minsz) {
+		pr_err("%s: Argument size %u less than min size %li",
+		       VFIO_AP_MODULE_NAME, info.argsz, minsz);
+		return -EINVAL;
+	}
+
+	info.flags = VFIO_DEVICE_FLAGS_AP;
+	info.num_regions = 0;
+	info.num_irqs = 0;
+
+	return copy_to_user((void __user *)arg, &info, minsz);
+}
+
+static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
+				    unsigned int cmd, unsigned long arg)
+{
+	int ret;
+
+	switch (cmd) {
+	case VFIO_DEVICE_GET_INFO:
+		ret = vfio_ap_mdev_get_device_info(arg);
+		break;
+	default:
+		pr_err("%s: ioctl command %d is not a supported command",
+		       VFIO_AP_MODULE_NAME, cmd);
+		ret = -EOPNOTSUPP;
+		break;
+	}
+
+	return ret;
+}
+
 static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
 {
 	return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
@@ -804,6 +846,7 @@ static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
 	.remove			= vfio_ap_mdev_remove,
 	.open			= vfio_ap_mdev_open,
 	.release		= vfio_ap_mdev_release,
+	.ioctl			= vfio_ap_mdev_ioctl,
 };
 
 int vfio_ap_mdev_register(struct ap_matrix *ap_matrix)
-- 
1.7.1