diff mbox series

[28/32] vfio-pci/zdev: wire up zPCI adapter interrupt forwarding support

Message ID 20211207205743.150299-29-mjrosato@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series KVM: s390: enable zPCI for interpretive execution | expand

Commit Message

Matthew Rosato Dec. 7, 2021, 8:57 p.m. UTC 
Introduce support for VFIO_DEVICE_FEATURE_ZPCI_AIF, which is a new
VFIO_DEVICE_FEATURE ioctl.  This interface is used to indicate that an
s390x vfio-pci device wishes to enable/disable zPCI adapter interrupt
forwarding, which allows underlying firmware to deliver interrupts
directly to the associated kvm guest.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
 arch/s390/include/asm/kvm_pci.h  |  2 +
 drivers/vfio/pci/vfio_pci_core.c |  2 +
 drivers/vfio/pci/vfio_pci_zdev.c | 96 +++++++++++++++++++++++++++++++-
 include/linux/vfio_pci_core.h    | 10 ++++
 include/uapi/linux/vfio.h        |  7 +++
 include/uapi/linux/vfio_zdev.h   | 20 +++++++
 6 files changed, 136 insertions(+), 1 deletion(-)

Comments

Pierre Morel Dec. 14, 2021, 9:48 a.m. UTC | #1 
On 12/7/21 21:57, Matthew Rosato wrote:
> Introduce support for VFIO_DEVICE_FEATURE_ZPCI_AIF, which is a new
> VFIO_DEVICE_FEATURE ioctl.  This interface is used to indicate that an
> s390x vfio-pci device wishes to enable/disable zPCI adapter interrupt
> forwarding, which allows underlying firmware to deliver interrupts
> directly to the associated kvm guest.
> 
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
>   arch/s390/include/asm/kvm_pci.h  |  2 +
>   drivers/vfio/pci/vfio_pci_core.c |  2 +
>   drivers/vfio/pci/vfio_pci_zdev.c | 96 +++++++++++++++++++++++++++++++-
>   include/linux/vfio_pci_core.h    | 10 ++++
>   include/uapi/linux/vfio.h        |  7 +++
>   include/uapi/linux/vfio_zdev.h   | 20 +++++++
>   6 files changed, 136 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/s390/include/asm/kvm_pci.h b/arch/s390/include/asm/kvm_pci.h
> index 062bac720428..0a0e42e1db1c 100644
> --- a/arch/s390/include/asm/kvm_pci.h
> +++ b/arch/s390/include/asm/kvm_pci.h
> @@ -36,6 +36,8 @@ struct kvm_zdev {
>   	struct zpci_fib fib;
>   	struct notifier_block nb;
>   	bool interp;
> +	bool aif;
> +	bool fhost;
>   };
>   
>   extern int kvm_s390_pci_dev_open(struct zpci_dev *zdev);
> diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
> index 2b2d64a2190c..01658de660bd 100644
> --- a/drivers/vfio/pci/vfio_pci_core.c
> +++ b/drivers/vfio/pci/vfio_pci_core.c
> @@ -1174,6 +1174,8 @@ long vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd,
>   			return 0;
>   		case VFIO_DEVICE_FEATURE_ZPCI_INTERP:
>   			return vfio_pci_zdev_feat_interp(vdev, feature, arg);
> +		case VFIO_DEVICE_FEATURE_ZPCI_AIF:
> +			return vfio_pci_zdev_feat_aif(vdev, feature, arg);
>   		default:
>   			return -ENOTTY;
>   		}
> diff --git a/drivers/vfio/pci/vfio_pci_zdev.c b/drivers/vfio/pci/vfio_pci_zdev.c
> index b205e0ad1fd3..dd98808b9139 100644
> --- a/drivers/vfio/pci/vfio_pci_zdev.c
> +++ b/drivers/vfio/pci/vfio_pci_zdev.c
> @@ -13,6 +13,7 @@
>   #include <linux/vfio_zdev.h>
>   #include <asm/pci_clp.h>
>   #include <asm/pci_io.h>
> +#include <asm/pci_insn.h>
>   #include <asm/kvm_pci.h>
>   
>   #include <linux/vfio_pci_core.h>
> @@ -206,6 +207,97 @@ int vfio_pci_zdev_feat_interp(struct vfio_pci_core_device *vdev,
>   	return rc;
>   }
>   
> +int vfio_pci_zdev_feat_aif(struct vfio_pci_core_device *vdev,
> +			   struct vfio_device_feature feature,
> +			   unsigned long arg)
> +{
> +	struct zpci_dev *zdev = to_zpci(vdev->pdev);
> +	struct vfio_device_zpci_aif *data;
> +	struct vfio_device_feature *feat;
> +	unsigned long minsz;
> +	int size, rc = 0;
> +
> +	if (!zdev || !zdev->kzdev)
> +		return -EINVAL;
> +
> +	/*
> +	 * If PROBE requested and feature not found, leave immediately.
> +	 * Otherwise, keep going as GET or SET may also be specified.
> +	 */
> +	if (feature.flags & VFIO_DEVICE_FEATURE_PROBE) {
> +		rc = kvm_s390_pci_aif_probe(zdev);
> +		if (rc)
> +			return rc;
> +	}
> +	if (!(feature.flags & (VFIO_DEVICE_FEATURE_GET +
> +			       VFIO_DEVICE_FEATURE_SET)))
> +		return 0;
> +
> +	size = sizeof(*feat) + sizeof(*data);
> +	feat = kzalloc(size, GFP_KERNEL);
> +	if (!feat)
> +		return -ENOMEM;
> +
> +	data = (struct vfio_device_zpci_aif *)&feat->data;
> +	minsz = offsetofend(struct vfio_device_feature, flags);

I think you should check the argsz.

> +
> +	/* Get the rest of the payload for GET/SET */
> +	rc = copy_from_user(data, (void __user *)(arg + minsz),
> +			    sizeof(*data));
> +	if (rc)
> +		rc = -EINVAL;
> +
> +	if (feature.flags & VFIO_DEVICE_FEATURE_GET) {
> +		if (zdev->kzdev->aif)
> +			data->flags = VFIO_DEVICE_ZPCI_FLAG_AIF_FLOAT;
> +		if (zdev->kzdev->fhost)
> +			data->flags |= VFIO_DEVICE_ZPCI_FLAG_AIF_HOST;
> +
> +		if (copy_to_user((void __user *)arg, feat, size))
> +			rc = -EFAULT;
> +	} else if (feature.flags & VFIO_DEVICE_FEATURE_SET) {
> +		if (data->flags & VFIO_DEVICE_ZPCI_FLAG_AIF_FLOAT) {
> +			/* create a guest fib */
> +			struct zpci_fib fib;
> +
> +			fib.fmt0.aibv = data->ibv;
> +			fib.fmt0.isc = data->isc;
> +			fib.fmt0.noi = data->noi;
> +			if (data->sb != 0) {
> +				fib.fmt0.aisb = data->sb;
> +				fib.fmt0.aisbo = data->sbo;
> +				fib.fmt0.sum = 1;
> +			} else {
> +				fib.fmt0.aisb = 0;
> +				fib.fmt0.aisbo = 0;
> +				fib.fmt0.sum = 0;
> +			}
> +			if (data->flags & VFIO_DEVICE_ZPCI_FLAG_AIF_HOST) {
> +				rc = kvm_s390_pci_aif_enable(zdev, &fib, false);
> +				if (!rc) {
> +					zdev->kzdev->aif = true;
> +					zdev->kzdev->fhost = true;
> +				}
> +			} else {
> +				rc = kvm_s390_pci_aif_enable(zdev, &fib, true);
> +				if (!rc)
> +					zdev->kzdev->aif = true;
> +			}
> +		} else if (data->flags == 0) {
> +			rc = kvm_s390_pci_aif_disable(zdev);
> +			if (!rc) {
> +				zdev->kzdev->aif = false;
> +				zdev->kzdev->fhost = false;
> +			}
> +		} else {
> +			rc = -EINVAL;
> +		}
> +	}
> +
> +	kfree(feat);
> +	return rc;
> +}
> +
>   static int vfio_pci_zdev_group_notifier(struct notifier_block *nb,
>   					unsigned long action, void *data)
>   {
> @@ -259,8 +351,10 @@ int vfio_pci_zdev_release(struct vfio_pci_core_device *vdev)
>   	 * If the device was using interpretation, don't trust that userspace
>   	 * did the appropriate cleanup
>   	 */
> -	if (zdev->gd != 0)
> +	if (zdev->gd != 0) {
> +		kvm_s390_pci_aif_disable(zdev);
>   		kvm_s390_pci_interp_disable(zdev);
> +	}
>   
>   	kvm_s390_pci_dev_release(zdev);
>   
> diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
> index 92dc43c827c9..5442d3fa1662 100644
> --- a/include/linux/vfio_pci_core.h
> +++ b/include/linux/vfio_pci_core.h
> @@ -201,6 +201,9 @@ extern int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
>   int vfio_pci_zdev_feat_interp(struct vfio_pci_core_device *vdev,
>   			      struct vfio_device_feature feature,
>   			      unsigned long arg);
> +int vfio_pci_zdev_feat_aif(struct vfio_pci_core_device *vdev,
> +			   struct vfio_device_feature feature,
> +			   unsigned long arg);
>   int vfio_pci_zdev_open(struct vfio_pci_core_device *vdev);
>   int vfio_pci_zdev_release(struct vfio_pci_core_device *vdev);
>   #else
> @@ -217,6 +220,13 @@ static inline int vfio_pci_zdev_feat_interp(struct vfio_pci_core_device *vdev,
>   	return -ENOTTY;
>   }
>   
> +static inline int vfio_pci_zdev_feat_aif(struct vfio_pci_core_device *vdev,
> +					 struct vfio_device_feature feature,
> +					 unsigned long arg)
> +{
> +	return -ENOTTY;
> +}
> +
>   static inline int vfio_pci_zdev_open(struct vfio_pci_core_device *vdev)
>   {
>   	return -ENODEV;
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index b9a75485b8e7..fe3bfd99bf50 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -1009,6 +1009,13 @@ struct vfio_device_feature {
>    */
>   #define VFIO_DEVICE_FEATURE_ZPCI_INTERP		(1)
>   
> +/*
> + * Provide support for enbaling adapter interruption forwarding for zPCI
> + * devices.  This feature is only valid for s390x PCI devices.  Data provided
> + * when setting and getting this feature is further described in vfio_zdev.h
> + */
> +#define VFIO_DEVICE_FEATURE_ZPCI_AIF		(2)
> +
>   /* -------- API for Type1 VFIO IOMMU -------- */
>   
>   /**
> diff --git a/include/uapi/linux/vfio_zdev.h b/include/uapi/linux/vfio_zdev.h
> index 575f0410dc66..c574e23f9385 100644
> --- a/include/uapi/linux/vfio_zdev.h
> +++ b/include/uapi/linux/vfio_zdev.h
> @@ -90,4 +90,24 @@ struct vfio_device_zpci_interp {
>   	__u32 fh;		/* Host device function handle */
>   };
>   
> +/**
> + * VFIO_DEVICE_FEATURE_ZPCI_AIF
> + *
> + * This feature is used for enabling forwarding of adapter interrupts directly
> + * from firmware to the guest.  When setting this feature, the flags indicate
> + * whether to enable/disable the feature and the structure defined below is
> + * used to setup the forwarding structures.  When getting this feature, only
> + * the flags are used to indicate the current state.
> + */
> +struct vfio_device_zpci_aif {
> +	__u64 flags;
> +#define VFIO_DEVICE_ZPCI_FLAG_AIF_FLOAT 1
> +#define VFIO_DEVICE_ZPCI_FLAG_AIF_HOST 2
> +	__u64 ibv;		/* Address of guest interrupt bit vector */
> +	__u64 sb;		/* Address of guest summary bit */
> +	__u32 noi;		/* Number of interrupts */
> +	__u8 isc;		/* Guest interrupt subclass */
> +	__u8 sbo;		/* Offset of guest summary bit vector */
> +};
> +
>   #endif
>
diff mbox series

Patch

diff --git a/arch/s390/include/asm/kvm_pci.h b/arch/s390/include/asm/kvm_pci.h
index 062bac720428..0a0e42e1db1c 100644
--- a/arch/s390/include/asm/kvm_pci.h
+++ b/arch/s390/include/asm/kvm_pci.h
@@ -36,6 +36,8 @@  struct kvm_zdev {
 	struct zpci_fib fib;
 	struct notifier_block nb;
 	bool interp;
+	bool aif;
+	bool fhost;
 };
 
 extern int kvm_s390_pci_dev_open(struct zpci_dev *zdev);
diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index 2b2d64a2190c..01658de660bd 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -1174,6 +1174,8 @@  long vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd,
 			return 0;
 		case VFIO_DEVICE_FEATURE_ZPCI_INTERP:
 			return vfio_pci_zdev_feat_interp(vdev, feature, arg);
+		case VFIO_DEVICE_FEATURE_ZPCI_AIF:
+			return vfio_pci_zdev_feat_aif(vdev, feature, arg);
 		default:
 			return -ENOTTY;
 		}
diff --git a/drivers/vfio/pci/vfio_pci_zdev.c b/drivers/vfio/pci/vfio_pci_zdev.c
index b205e0ad1fd3..dd98808b9139 100644
--- a/drivers/vfio/pci/vfio_pci_zdev.c
+++ b/drivers/vfio/pci/vfio_pci_zdev.c
@@ -13,6 +13,7 @@ 
 #include <linux/vfio_zdev.h>
 #include <asm/pci_clp.h>
 #include <asm/pci_io.h>
+#include <asm/pci_insn.h>
 #include <asm/kvm_pci.h>
 
 #include <linux/vfio_pci_core.h>
@@ -206,6 +207,97 @@  int vfio_pci_zdev_feat_interp(struct vfio_pci_core_device *vdev,
 	return rc;
 }
 
+int vfio_pci_zdev_feat_aif(struct vfio_pci_core_device *vdev,
+			   struct vfio_device_feature feature,
+			   unsigned long arg)
+{
+	struct zpci_dev *zdev = to_zpci(vdev->pdev);
+	struct vfio_device_zpci_aif *data;
+	struct vfio_device_feature *feat;
+	unsigned long minsz;
+	int size, rc = 0;
+
+	if (!zdev || !zdev->kzdev)
+		return -EINVAL;
+
+	/*
+	 * If PROBE requested and feature not found, leave immediately.
+	 * Otherwise, keep going as GET or SET may also be specified.
+	 */
+	if (feature.flags & VFIO_DEVICE_FEATURE_PROBE) {
+		rc = kvm_s390_pci_aif_probe(zdev);
+		if (rc)
+			return rc;
+	}
+	if (!(feature.flags & (VFIO_DEVICE_FEATURE_GET +
+			       VFIO_DEVICE_FEATURE_SET)))
+		return 0;
+
+	size = sizeof(*feat) + sizeof(*data);
+	feat = kzalloc(size, GFP_KERNEL);
+	if (!feat)
+		return -ENOMEM;
+
+	data = (struct vfio_device_zpci_aif *)&feat->data;
+	minsz = offsetofend(struct vfio_device_feature, flags);
+
+	/* Get the rest of the payload for GET/SET */
+	rc = copy_from_user(data, (void __user *)(arg + minsz),
+			    sizeof(*data));
+	if (rc)
+		rc = -EINVAL;
+
+	if (feature.flags & VFIO_DEVICE_FEATURE_GET) {
+		if (zdev->kzdev->aif)
+			data->flags = VFIO_DEVICE_ZPCI_FLAG_AIF_FLOAT;
+		if (zdev->kzdev->fhost)
+			data->flags |= VFIO_DEVICE_ZPCI_FLAG_AIF_HOST;
+
+		if (copy_to_user((void __user *)arg, feat, size))
+			rc = -EFAULT;
+	} else if (feature.flags & VFIO_DEVICE_FEATURE_SET) {
+		if (data->flags & VFIO_DEVICE_ZPCI_FLAG_AIF_FLOAT) {
+			/* create a guest fib */
+			struct zpci_fib fib;
+
+			fib.fmt0.aibv = data->ibv;
+			fib.fmt0.isc = data->isc;
+			fib.fmt0.noi = data->noi;
+			if (data->sb != 0) {
+				fib.fmt0.aisb = data->sb;
+				fib.fmt0.aisbo = data->sbo;
+				fib.fmt0.sum = 1;
+			} else {
+				fib.fmt0.aisb = 0;
+				fib.fmt0.aisbo = 0;
+				fib.fmt0.sum = 0;
+			}
+			if (data->flags & VFIO_DEVICE_ZPCI_FLAG_AIF_HOST) {
+				rc = kvm_s390_pci_aif_enable(zdev, &fib, false);
+				if (!rc) {
+					zdev->kzdev->aif = true;
+					zdev->kzdev->fhost = true;
+				}
+			} else {
+				rc = kvm_s390_pci_aif_enable(zdev, &fib, true);
+				if (!rc)
+					zdev->kzdev->aif = true;
+			}
+		} else if (data->flags == 0) {
+			rc = kvm_s390_pci_aif_disable(zdev);
+			if (!rc) {
+				zdev->kzdev->aif = false;
+				zdev->kzdev->fhost = false;
+			}
+		} else {
+			rc = -EINVAL;
+		}
+	}
+
+	kfree(feat);
+	return rc;
+}
+
 static int vfio_pci_zdev_group_notifier(struct notifier_block *nb,
 					unsigned long action, void *data)
 {
@@ -259,8 +351,10 @@  int vfio_pci_zdev_release(struct vfio_pci_core_device *vdev)
 	 * If the device was using interpretation, don't trust that userspace
 	 * did the appropriate cleanup
 	 */
-	if (zdev->gd != 0)
+	if (zdev->gd != 0) {
+		kvm_s390_pci_aif_disable(zdev);
 		kvm_s390_pci_interp_disable(zdev);
+	}
 
 	kvm_s390_pci_dev_release(zdev);
 
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
index 92dc43c827c9..5442d3fa1662 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -201,6 +201,9 @@  extern int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
 int vfio_pci_zdev_feat_interp(struct vfio_pci_core_device *vdev,
 			      struct vfio_device_feature feature,
 			      unsigned long arg);
+int vfio_pci_zdev_feat_aif(struct vfio_pci_core_device *vdev,
+			   struct vfio_device_feature feature,
+			   unsigned long arg);
 int vfio_pci_zdev_open(struct vfio_pci_core_device *vdev);
 int vfio_pci_zdev_release(struct vfio_pci_core_device *vdev);
 #else
@@ -217,6 +220,13 @@  static inline int vfio_pci_zdev_feat_interp(struct vfio_pci_core_device *vdev,
 	return -ENOTTY;
 }
 
+static inline int vfio_pci_zdev_feat_aif(struct vfio_pci_core_device *vdev,
+					 struct vfio_device_feature feature,
+					 unsigned long arg)
+{
+	return -ENOTTY;
+}
+
 static inline int vfio_pci_zdev_open(struct vfio_pci_core_device *vdev)
 {
 	return -ENODEV;
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index b9a75485b8e7..fe3bfd99bf50 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -1009,6 +1009,13 @@  struct vfio_device_feature {
  */
 #define VFIO_DEVICE_FEATURE_ZPCI_INTERP		(1)
 
+/*
+ * Provide support for enbaling adapter interruption forwarding for zPCI
+ * devices.  This feature is only valid for s390x PCI devices.  Data provided
+ * when setting and getting this feature is further described in vfio_zdev.h
+ */
+#define VFIO_DEVICE_FEATURE_ZPCI_AIF		(2)
+
 /* -------- API for Type1 VFIO IOMMU -------- */
 
 /**
diff --git a/include/uapi/linux/vfio_zdev.h b/include/uapi/linux/vfio_zdev.h
index 575f0410dc66..c574e23f9385 100644
--- a/include/uapi/linux/vfio_zdev.h
+++ b/include/uapi/linux/vfio_zdev.h
@@ -90,4 +90,24 @@  struct vfio_device_zpci_interp {
 	__u32 fh;		/* Host device function handle */
 };
 
+/**
+ * VFIO_DEVICE_FEATURE_ZPCI_AIF
+ *
+ * This feature is used for enabling forwarding of adapter interrupts directly
+ * from firmware to the guest.  When setting this feature, the flags indicate
+ * whether to enable/disable the feature and the structure defined below is
+ * used to setup the forwarding structures.  When getting this feature, only
+ * the flags are used to indicate the current state.
+ */
+struct vfio_device_zpci_aif {
+	__u64 flags;
+#define VFIO_DEVICE_ZPCI_FLAG_AIF_FLOAT 1
+#define VFIO_DEVICE_ZPCI_FLAG_AIF_HOST 2
+	__u64 ibv;		/* Address of guest interrupt bit vector */
+	__u64 sb;		/* Address of guest summary bit */
+	__u32 noi;		/* Number of interrupts */
+	__u8 isc;		/* Guest interrupt subclass */
+	__u8 sbo;		/* Offset of guest summary bit vector */
+};
+
 #endif