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authorLinus Torvalds <torvalds@linux-foundation.org>2023-05-02 20:56:43 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2023-05-02 20:56:43 +0200
commit7df047b3f0aa0c0ba730b6be9ab35c0053a3d4fd (patch)
treed49c090a100c070c357f55557e401b04526d0032 /Documentation/virt
parentMerge tag 'afs-fixes-20230502' of git://git.kernel.org/pub/scm/linux/kernel/g... (diff)
parentdocs: kvm: vfio: Suggest KVM_DEV_VFIO_GROUP_ADD vs VFIO_GROUP_GET_DEVICE_FD o... (diff)
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Merge tag 'vfio-v6.4-rc1' of https://github.com/awilliam/linux-vfio
Pull VFIO updates from Alex Williamson: - Expose and allow R/W access to the PCIe DVSEC capability through vfio-pci, as we already do with the legacy vendor capability (K V P Satyanarayana) - Fix kernel-doc issues with structure definitions (Simon Horman) - Clarify ordering of operations relative to the kvm-vfio device for driver dependencies against the kvm pointer (Yi Liu) * tag 'vfio-v6.4-rc1' of https://github.com/awilliam/linux-vfio: docs: kvm: vfio: Suggest KVM_DEV_VFIO_GROUP_ADD vs VFIO_GROUP_GET_DEVICE_FD ordering vfio: correct kdoc for ops structures vfio/pci: Add DVSEC PCI Extended Config Capability to user visible list.
Diffstat (limited to 'Documentation/virt')
-rw-r--r--Documentation/virt/kvm/devices/vfio.rst5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/devices/vfio.rst b/Documentation/virt/kvm/devices/vfio.rst
index 2d20dc561069..08b544212638 100644
--- a/Documentation/virt/kvm/devices/vfio.rst
+++ b/Documentation/virt/kvm/devices/vfio.rst
@@ -39,3 +39,8 @@ KVM_DEV_VFIO_GROUP attributes:
- @groupfd is a file descriptor for a VFIO group;
- @tablefd is a file descriptor for a TCE table allocated via
KVM_CREATE_SPAPR_TCE.
+
+The GROUP_ADD operation above should be invoked prior to accessing the
+device file descriptor via VFIO_GROUP_GET_DEVICE_FD in order to support
+drivers which require a kvm pointer to be set in their .open_device()
+callback.