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298be81446
In order to replicate the ACPI notification from the host to the guest
pass-through devices:
1) allocate GPE and eventfd per pci-vfio device
2) generate proper aml code for ACPI GPE handler. The example of generated aml:
Scope (_GPE)
{
Method (_E00, 0, NotSerialized) // _Exx: Edge-Triggered GPE, xx=0x00-0xFF
{
Local0 = \_SB.PC00.PE08.NOTY
Notify (\_SB.PC00.PE08, Local0)
}
}
The eventfd is registered by host kernel via VFIO_DEVICE_SET_IRQS
ioctl. Crosvm upon receiving early provided, per pci-vfio eventfd,
stores the notification value and triggers GPE associated to pci-vfio
device.
Guest kernel upon handling GPE (thanks to generated aml [ad 2)],
triggers Notify on required pass-through device and therefore replicates
the ACPI Notification on the guest side [Accessing \_SB.PC00.PE08.NOTY
pointed by VCFG opregion result with trap to crosvm, which returns
previously stored notify value].
Kernel counterpart: CL:4538472
BUG=b:244205651
TEST=Observe replication of ACPI notification in the guest kernel
Change-Id: Iaf66097acd84f3066f6ff70d382f83ecaeea9a00
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4538483
Commit-Queue: Grzegorz Jaszczyk <jaszczyk@google.com>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
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| bindgen.sh | ||
| Cargo.toml | ||