Commit 6c8017c6 authored by Reinette Chatre's avatar Reinette Chatre Committed by Alex Williamson
Browse files

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: default avatarReinette Chatre <reinette.chatre@intel.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/fd1ef2bf6ae972da8e2805bc95d5155af5a8fb0a.1683740667.git.reinette.chatre@intel.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent e4163438

drivers/vfio/pci/vfio_pci_core.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

include/uapi/linux/vfio.h

+3 −0
Original line number Diff line number Diff line
@@ -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;