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Date:   Sun, 17 May 2020 22:52:45 -0400
From:   Yan Zhao <>
        Yan Zhao <>
Subject: [RFC PATCH v4 07/10] vfio/pci: introduce a new irq type VFIO_IRQ_TYPE_REMAP_BAR_REGION

This is a virtual irq type.
vendor driver triggers this irq when it wants to notify userspace to
remap PCI BARs.

1. vendor driver triggers this irq and packs the target bar number in
   the ctx count. i.e. "1 << bar_number".
   if a bit is set, the corresponding bar is to be remapped.

2. userspace requery the specified PCI BAR from kernel and if flags of
the bar regions are changed, it removes the old subregions and attaches
subregions according to the new flags.

3. userspace notifies back to kernel by writing one to the eventfd of
this irq.

Please check the corresponding qemu implementation from the reply of this
patch, and a sample usage in vendor driver in patch [10/10].

Cc: Kevin Tian <>
Signed-off-by: Yan Zhao <>
 include/uapi/linux/vfio.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 2d0d85c7c4d4..55895f75d720 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -704,6 +704,17 @@ struct vfio_irq_info_cap_type {
 	__u32 subtype;  /* type specific */
+/* Bar Region Query IRQ TYPE */
+/* sub-types for VFIO_IRQ_TYPE_REMAP_BAR_REGION */
+ * This irq notifies userspace to re-query BAR region and remaps the
+ * subregions.
+ */
  * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct vfio_irq_set)

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