[PATCH v7 18/22] vfio-pci/zdev: add function handle to clp base capability

Matthew Rosato
2022-05-13T19:18:16Z

The function handle is a system-wide unique identifier for a zPCI
device. With zPCI instruction interpretation, the host will no
longer be executing the zPCI instructions on behalf of the guest.
As a result, the guest needs to use the real function handle in
order for firmware to associate the instruction with the proper
PCI function. Let's provide that handle to the guest.

Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
drivers/vfio/pci/vfio_pci_zdev.c | 5 +++--
include/uapi/linux/vfio_zdev.h | 3 +++
2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/pci/vfio_pci_zdev.c b/drivers/vfio/pci/vfio_pci_zdev.c
index 130ab298ab98..c7557f80ec64 100644
--- a/drivers/vfio/pci/vfio_pci_zdev.c
+++ b/drivers/vfio/pci/vfio_pci_zdev.c
@@ -24,14 +24,15 @@ static int zpci_base_cap(struct zpci_dev *zdev, struct vfio_info_cap *caps)
{
struct vfio_device_info_cap_zpci_base cap = {
.header.id = VFIO_DEVICE_INFO_CAP_ZPCI_BASE,
- .header.version = 1,
+ .header.version = 2,
.start_dma = zdev->start_dma,
.end_dma = zdev->end_dma,
.pchid = zdev->pchid,
.vfn = zdev->vfn,
.fmb_length = zdev->fmb_length,
.pft = zdev->pft,
- .gid = zdev->pfgid
+ .gid = zdev->pfgid,
+ .fh = zdev->fh
};

return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
diff --git a/include/uapi/linux/vfio_zdev.h b/include/uapi/linux/vfio_zdev.h
index b4309397b6b2..78c022af3d29 100644
--- a/include/uapi/linux/vfio_zdev.h
+++ b/include/uapi/linux/vfio_zdev.h
@@ -29,6 +29,9 @@ struct vfio_device_info_cap_zpci_base {
__u16 fmb_length; /* Measurement Block Length (in bytes) */
__u8 pft; /* PCI Function Type */
__u8 gid; /* PCI function group ID */
+ /* End of version 1 */
+ __u32 fh; /* PCI function handle */
+ /* End of version 2 */
};

/**
--
2.27.0