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vfio-pci/zdev: add open/close device hooks

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During vfio-pci open_device, pass the KVM associated with the vfio group
(if one exists).  This is needed in order to pass a special indicator
(GISA) to firmware to allow zPCI interpretation facilities to be used
for only the specific KVM associated with the vfio-pci device.  During
vfio-pci close_device, unregister the notifier.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Link: https://lore.kernel.org/r/20220606203325.110625-18-mjrosato@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
This commit is contained in:
Matthew Rosato 2022-06-06 16:33:21 -04:00 committed by Christian Borntraeger
parent 09340b2fca
commit 8061d1c31f
3 changed files with 43 additions and 1 deletions
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10
drivers/vfio/pci/vfio_pci_core.c
View File

@ -316,10 +316,14 @@ int vfio_pci_core_enable(struct vfio_pci_core_device *vdev)
pci_write_config_word(pdev, PCI_COMMAND, cmd);
}
ret = vfio_config_init(vdev);
ret = vfio_pci_zdev_open_device(vdev);
if (ret)
goto out_free_state;
ret = vfio_config_init(vdev);
if (ret)
goto out_free_zdev;
msix_pos = pdev->msix_cap;
if (msix_pos) {
u16 flags;
@ -340,6 +344,8 @@ int vfio_pci_core_enable(struct vfio_pci_core_device *vdev)
return 0;
out_free_zdev:
vfio_pci_zdev_close_device(vdev);
out_free_state:
kfree(vdev->pci_saved_state);
vdev->pci_saved_state = NULL;
@ -418,6 +424,8 @@ void vfio_pci_core_disable(struct vfio_pci_core_device *vdev)
vdev->needs_reset = true;
vfio_pci_zdev_close_device(vdev);
/*
* If we have saved state, restore it. If we can reset the device,
* even better. Resetting with current state seems better than

24
drivers/vfio/pci/vfio_pci_zdev.c
View File

@ -11,6 +11,7 @@
#include <linux/uaccess.h>
#include <linux/vfio.h>
#include <linux/vfio_zdev.h>
#include <linux/kvm_host.h>
#include <asm/pci_clp.h>
#include <asm/pci_io.h>
@ -136,3 +137,26 @@ int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
return ret;
}
int vfio_pci_zdev_open_device(struct vfio_pci_core_device *vdev)
{
struct zpci_dev *zdev = to_zpci(vdev->pdev);
if (!zdev)
return -ENODEV;
if (!vdev->vdev.kvm)
return 0;
return kvm_s390_pci_register_kvm(zdev, vdev->vdev.kvm);
}
void vfio_pci_zdev_close_device(struct vfio_pci_core_device *vdev)
{
struct zpci_dev *zdev = to_zpci(vdev->pdev);
if (!zdev || !vdev->vdev.kvm)
return;
kvm_s390_pci_unregister_kvm(zdev);
}

10
include/linux/vfio_pci_core.h
View File

@ -209,12 +209,22 @@ static inline int vfio_pci_igd_init(struct vfio_pci_core_device *vdev)
#ifdef CONFIG_VFIO_PCI_ZDEV_KVM
extern int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
struct vfio_info_cap *caps);
int vfio_pci_zdev_open_device(struct vfio_pci_core_device *vdev);
void vfio_pci_zdev_close_device(struct vfio_pci_core_device *vdev);
#else
static inline int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
struct vfio_info_cap *caps)
{
return -ENODEV;
}
static inline int vfio_pci_zdev_open_device(struct vfio_pci_core_device *vdev)
{
return 0;
}
static inline void vfio_pci_zdev_close_device(struct vfio_pci_core_device *vdev)
{}
#endif
/* Will be exported for vfio pci drivers usage */