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From: Yan Zhao <yan.y.zhao@intel.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: alex.williamson@redhat.com, cohuck@redhat.com,
	zhenyuw@linux.intel.com, zhi.a.wang@intel.com,
	kevin.tian@intel.com, shaopeng.he@intel.com, yi.l.liu@intel.com,
	xin.zeng@intel.com, hang.yuan@intel.com,
	Yan Zhao <yan.y.zhao@intel.com>
Subject: [RFC PATCH v4 07/10] vfio/pci: introduce a new irq type VFIO_IRQ_TYPE_REMAP_BAR_REGION
Date: Sun, 17 May 2020 22:52:45 -0400	[thread overview]
Message-ID: <20200518025245.14425-1-yan.y.zhao@intel.com> (raw)
In-Reply-To: <20200518024202.13996-1-yan.y.zhao@intel.com>

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 <kevin.tian@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
---
 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 */
+#define VFIO_IRQ_TYPE_REMAP_BAR_REGION			(1)
+
+/* sub-types for VFIO_IRQ_TYPE_REMAP_BAR_REGION */
+/*
+ * This irq notifies userspace to re-query BAR region and remaps the
+ * subregions.
+ */
+#define VFIO_IRQ_SUBTYPE_REMAP_BAR_REGION	(0)
+
+
 /**
  * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct vfio_irq_set)
  *
-- 
2.17.1


  parent reply	other threads:[~2020-05-18  3:02 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-18  2:42 [RFC PATCH v4 00/10] Introduce vendor ops in vfio-pci Yan Zhao
2020-05-18  2:43 ` [RFC PATCH v4 01/10] vfio/pci: register/unregister vfio_pci_vendor_driver_ops Yan Zhao
2020-05-18  2:45 ` [RFC PATCH v4 02/10] vfio/pci: macros to generate module_init and module_exit for vendor modules Yan Zhao
2020-06-04 15:01   ` Cornelia Huck
2020-06-05  2:05     ` Yan Zhao
2020-05-18  2:49 ` [RFC PATCH v4 03/10] vfio/pci: export vendor_data, irq_type, num_regions, pdev and functions in vfio_pci_ops Yan Zhao
2020-05-18  2:49 ` [RFC PATCH v4 04/10] vfio/pci: let vfio_pci know number of vendor regions and vendor irqs Yan Zhao
2020-06-04 15:25   ` Cornelia Huck
2020-06-05  2:15     ` Yan Zhao
2020-06-11 12:31       ` David Edmondson
2020-06-11 23:09         ` Yan Zhao
2020-05-18  2:50 ` [RFC PATCH v4 05/10] vfio/pci: export vfio_pci_get_barmap Yan Zhao
2020-05-18  2:50 ` [RFC PATCH v4 06/10] vfio: Define device specific irq type capability Yan Zhao
2020-05-18  2:52 ` Yan Zhao [this message]
2020-05-18  2:56   ` [QEMU RFC PATCH v4] hw/vfio/pci: remap bar region irq Yan Zhao
2020-05-29 21:45   ` [RFC PATCH v4 07/10] vfio/pci: introduce a new irq type VFIO_IRQ_TYPE_REMAP_BAR_REGION Alex Williamson
2020-06-01  6:57     ` Yan Zhao
2020-06-01 16:43       ` Alex Williamson
2020-06-02  8:28         ` Yan Zhao
2020-06-02 19:34           ` Alex Williamson
2020-06-03  1:40             ` Yan Zhao
2020-06-03 23:04               ` Alex Williamson
2020-06-04  2:42                 ` Yan Zhao
2020-06-04  4:10                   ` Alex Williamson
2020-06-05  0:26                     ` He, Shaopeng
2020-06-05 17:54                       ` Alex Williamson
2020-06-05  2:02                     ` Yan Zhao
2020-06-05 16:13                       ` Alex Williamson
2020-06-10  5:23                         ` Yan Zhao
2020-06-19 22:55                           ` Alex Williamson
2020-06-22  3:34                             ` Yan Zhao
2020-05-18  2:53 ` [RFC PATCH v4 08/10] i40e/vf_migration: VF live migration - pass-through VF first Yan Zhao
2020-06-10  8:59   ` Xiang Zheng
2020-06-11  0:23     ` Yan Zhao
2020-06-11  2:27       ` Xiang Zheng
2020-06-11 23:10         ` Yan Zhao
2020-05-18  2:54 ` [RFC PATCH v4 09/10] i40e/vf_migration: register a migration vendor region Yan Zhao
2020-05-18  2:54 ` [RFC PATCH v4 10/10] i40e/vf_migration: vendor defined irq_type to support dynamic bar map Yan Zhao

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