linux-kernel - [RFC PATCH 8/8] vfio/pci: Clear VFIO_IRQ_INFO

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Message-Id: <549e6300c0ea011cdce9a2712d49de4efd3a06b7.1678911529.git.reinette.chatre@intel.com>
Date:   Wed, 15 Mar 2023 13:59:28 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     jgg@...dia.com, yishaih@...dia.com,
        shameerali.kolothum.thodi@...wei.com, kevin.tian@...el.com,
        alex.williamson@...hat.com
Cc:     tglx@...utronix.de, darwi@...utronix.de, kvm@...r.kernel.org,
        dave.jiang@...el.com, jing2.liu@...el.com, ashok.raj@...el.com,
        fenghua.yu@...el.com, tom.zanussi@...ux.intel.com,
        reinette.chatre@...el.com, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 8/8] 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@...el.com>
---
 drivers/vfio/pci/vfio_pci_core.c | 2 +-
 include/uapi/linux/vfio.h        | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index ae0e161c7fc9..1d071ee212a7 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -1111,7 +1111,7 @@ 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)
 		info.flags |= VFIO_IRQ_INFO_NORESIZE;
 
 	return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 0552e8dcf0cb..1a36134cae5c 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -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;
-- 
2.34.1