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vfio/pci: Clear VFIO_IRQ_INFO_NORESIZE for MSI-X 

Dynamic MSI-X is supported. Clear VFIO_IRQ_INFO_NORESIZE
to provide guidance to user space.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/fd1ef2bf6ae972da8e2805bc95d5155af5a8fb0a.1683740667.git.reinette.chatre@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Reinette Chatre 2023-05-11 08:44:38 -07:00 committed by Alex Williamson
parent e4163438e0
commit 6c8017c6a5
2 changed files with 4 additions and 1 deletions
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2
drivers/vfio/pci/vfio_pci_core.c
View File

@ -1114,7 +1114,7 @@ static int vfio_pci_ioctl_get_irq_info(struct vfio_pci_core_device *vdev,
if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
info.flags |=
(VFIO_IRQ_INFO_MASKABLE | VFIO_IRQ_INFO_AUTOMASKED);
else
else if (info.index != VFIO_PCI_MSIX_IRQ_INDEX || !vdev->has_dyn_msix)
info.flags |= VFIO_IRQ_INFO_NORESIZE;
return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;

3
include/uapi/linux/vfio.h
View File

@ -511,6 +511,9 @@ struct vfio_region_info_cap_nvlink2_lnkspd {
* then add and unmask vectors, it's up to userspace to make the decision
* whether to allocate the maximum supported number of vectors or tear
* down setup and incrementally increase the vectors as each is enabled.
* Absence of the NORESIZE flag indicates that vectors can be enabled
* and disabled dynamically without impacting other vectors within the
* index.
*/
struct vfio_irq_info {
__u32 argsz;