Re: [PATCH v2 25/30] vfio-pci/zdev: wire up zPCI interpretive execution support

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On 1/25/22 8:01 AM, Pierre Morel wrote:


On 1/14/22 21:31, Matthew Rosato wrote:
Introduce support for VFIO_DEVICE_FEATURE_ZPCI_INTERP, 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 interpretive
execution, which allows zPCI instructions to be executed directly by
underlying firmware without KVM involvement.

Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
---
  arch/s390/include/asm/kvm_pci.h  |  1 +
  drivers/vfio/pci/vfio_pci_core.c |  2 +
  drivers/vfio/pci/vfio_pci_zdev.c | 78 ++++++++++++++++++++++++++++++++
  include/linux/vfio_pci_core.h    | 10 ++++
  include/uapi/linux/vfio.h        |  7 +++
  include/uapi/linux/vfio_zdev.h   | 15 ++++++
  6 files changed, 113 insertions(+)

diff --git a/arch/s390/include/asm/kvm_pci.h b/arch/s390/include/asm/kvm_pci.h
index 97a90b37c87d..dc00c3f27a00 100644
--- a/arch/s390/include/asm/kvm_pci.h
+++ b/arch/s390/include/asm/kvm_pci.h
@@ -35,6 +35,7 @@ struct kvm_zdev {
      struct kvm_zdev_ioat ioat;
      struct zpci_fib fib;
      struct notifier_block nb;
+    bool interp;

NIT: s/interp/interpretation/ ?

OK


  };
  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 fc57d4d0abbe..2b2d64a2190c 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -1172,6 +1172,8 @@ long vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd,
              mutex_unlock(&vdev->vf_token->lock);
              return 0;
+        case VFIO_DEVICE_FEATURE_ZPCI_INTERP:
+            return vfio_pci_zdev_feat_interp(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 5c2bddc57b39..4339f48b98bc 100644
--- a/drivers/vfio/pci/vfio_pci_zdev.c
+++ b/drivers/vfio/pci/vfio_pci_zdev.c
@@ -54,6 +54,10 @@ static int zpci_group_cap(struct zpci_dev *zdev, struct vfio_info_cap *caps)
          .version = zdev->version
      };
+    /* Some values are different for interpreted devices */
+    if (zdev->kzdev && zdev->kzdev->interp)
+        cap.maxstbl = zdev->maxstbl;
+
      return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
  }
@@ -138,6 +142,72 @@ int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
      return ret;
  }
+int vfio_pci_zdev_feat_interp(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_interp *data;
+    struct vfio_device_feature *feat;
+    unsigned long minsz;
+    int size, rc;
+
+    if (!zdev || !zdev->kzdev)
+        return -EINVAL;
+
+    /* If PROBE specified, return probe results immediately */
+    if (feature.flags & VFIO_DEVICE_FEATURE_PROBE)
+        return kvm_s390_pci_interp_probe(zdev);
+
+    /* GET and SET are mutually exclusive */
+    if ((feature.flags & VFIO_DEVICE_FEATURE_GET) &&
+        (feature.flags & VFIO_DEVICE_FEATURE_SET))
+        return -EINVAL;

Isn't the check already done in VFIO core?

Oh, yes you are correct. Then this can be removed for this patch as well as the next 2 patches.





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