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hw/vfio/display: add ramfb support

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So we have a boot display when using a vgpu as primary display.

ramfb depends on a fw_cfg file.  fw_cfg files can not be added and
removed at runtime, therefore a ramfb-enabled vfio device can't be
hotplugged.

Add a nohotplug variant of the vfio-pci device (as child class).  Add
the ramfb property to the nohotplug variant only.  So to enable the vgpu
display with boot support use this:

  -device vfio-pci-nohotplug,display=on,ramfb=on,sysfsdev=...

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Gerd Hoffmann 2018-10-15 10:52:09 -06:00 • committed by Alex Williamson
parent 7f623d0834
commit b290659fc3
4 changed files with 40 additions and 0 deletions
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hw/vfio/pci.h
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@ -165,6 +165,7 @@ typedef struct VFIOPCIDevice {
bool no_geforce_quirks;
bool no_kvm_ioeventfd;
bool no_vfio_ioeventfd;
bool enable_ramfb;
VFIODisplay *dpy;
} VFIOPCIDevice;