Lines Matching full:to
4 Using vfio-pci, we can passthrough Intel Graphics Device (IGD) to guest, either
8 memory regions other than BARs. Special handling is required to make them work
15 Certain guest software also depends on following conditions to work:
22 | #3 IGD is assigned to BDF 00:02.0 | | | * | * |
24 | #5 Host's VGA ranges are mapped to IGD | | | * | |
27 ^1 Though i915 driver is able to mock a OpRegion, it is still recommended to
28 use the VBT copied from host OpRegion to prevent incorrect configuration.
30 For #1, the "x-igd-opregion=on" option exposes a copy of host IGD OpRegion to
34 to guest. Currently this is only supported on i440fx machines as there is
36 lead to unexpected behavior.
38 For #3, "addr=2.0" assigns IGD to 00:02.0.
40 For #4, the primary display must be set to IGD in host BIOS.
42 For #5, "x-vga=on" enables guest access to standard VGA IO/MMIO ranges.
45 Intel document [1] shows how to dump VBIOS to file. For UEFI Option ROM, see
50 * IGD generation is 6 to 9 (Sandy Bridge to Comet Lake)
52 * IGD is assigned to guest BDF 00:02.0
56 VGA range access, which is equivalent to:
60 "x-igd-legacy-mode=on" to force enabling legacy mode, this also checks if the
62 fail immediately. Users can also set "x-igd-legacy-mode=off" to disable legacy
65 In legacy mode, as the guest VGA ranges are assigned to IGD device, all other
70 may generate faults and errors upon re-binding to an IGD device after it
71 has been assigned to a VM. It's therefore generally recommended to prevent
72 such driver binding unless the host driver is known to work well for this.
73 There are numerous ways to do this, i915 can be blacklisted on the host,
74 the driver_override option can be used to ensure that only vfio-pci can bind
75 to the device on the host[2], virsh nodedev-detach can be used to bind the
76 device to vfio drivers and then managed='no' set in the VM xml to prevent
77 re-binding to i915, etc. Also note that IGD is also typically the primary
79 blacklisting i915 or using pci-stub/vfio-pci to take ownership of IGD as a
81 It may therefore be necessary to use kernel boot options video=vesafb:off or
82 video=efifb:off (depending on host BIOS/UEFI) or these can be combined to
85 Failed to mmap 0000:00:02.0 BAR <>. Performance may be slow
89 of the device to cause such conflicts.
91 Additionally, IGD device are known to generate small numbers of DMAR faults
93 to access the reserved GTT space after reset, which it no longer has access to
97 Additionally++, analog VGA output (as opposed to digital outputs like HDMI,
99 experience, even DP to VGA adapters can be troublesome while adapters between
106 Copy host IGD OpRegion and expose it to guest with fw_cfg
141 to it. The dword based address of this reserved memory region must also
142 be written to the ASLS register at offset 0xFC on the IGD device. It is
152 alignment equal to this size. Additionally the base address of this
153 reserved region must be written to the dword BDSM register in PCI config
155 64-bit BDSM). As this support is related to running the IGD ROM, which
157 it's expected that this fw_cfg file is only relevant to a single PCI
162 no need for guest firmware to allocate data stolen memory in guest address
163 space and write it to BDSM register. Value of this fw_cfg file is 0 in
168 solution is to create a virtual OpRom with following DXE drivers:
170 * IgdAssignmentDxe: Set up OpRegion and BDSM according to fw_cfg (must)
179 You need to build them with EDK2.
181 For the IntelGopDriver, Intel never released it to public. You may contact
182 Intel support to get one as [4] said, if you are an Intel Premier Support
198 Set the host physical address bits to IOMMU address width using
211 IGD has it own address space. To use system RAM as VRAM, a single-level page
230 to access it is through the second half of MMIO BAR0.
234 reserving a continuous region and program its base address to BDSM register,