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runtime: Introduce new gRPC device type for VFIO-AP coldplug

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This commit introduces a new gRPC device type, `vfio-ap-cold`, to support
VFIO-AP coldplug. This enables the VM guest to handle passthrough devices
differently from VFIO-AP hotplug.
With this new type, the guest no longer needs to wait for events (e.g., device
addition) because the device already exists at the time the device type is checked.

Signed-off-by: Hyounggyu Choi <Hyounggyu.Choi@ibm.com>
This commit is contained in:
Hyounggyu Choi 2025-01-21 13:23:06 +01:00
parent 419b5ed715
commit 4a6ba534f1
1 changed files with 13 additions and 3 deletions
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16
src/runtime/virtcontainers/kata_agent.go
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@ -108,9 +108,10 @@ var (
kataVirtioFSDevType = "virtio-fs"
kataOverlayDevType = "overlayfs"
kataWatchableBindDevType = "watchable-bind"
kataVfioPciDevType = "vfio-pci" // VFIO PCI device to used as VFIO in the container
kataVfioPciGuestKernelDevType = "vfio-pci-gk" // VFIO PCI device for consumption by the guest kernel
kataVfioApDevType = "vfio-ap"
kataVfioPciDevType = "vfio-pci" // VFIO PCI device to used as VFIO in the container
kataVfioPciGuestKernelDevType = "vfio-pci-gk" // VFIO PCI device for consumption by the guest kernel
kataVfioApDevType = "vfio-ap" // VFIO AP device for hot-plugging
kataVfioApColdDevType = "vfio-ap-cold" // VFIO AP device for cold-plugging
sharedDir9pOptions = []string{"trans=virtio,version=9p2000.L,cache=mmap", "nodev"}
sharedDirVirtioFSOptions = []string{}
sharedDirVirtioFSDaxOptions = "dax"
@ -1211,6 +1212,15 @@ func (k *kataAgent) appendVfioDevice(dev ContainerDevice, device api.Device, c *
for i, dev := range devList {
if dev.Type == config.VFIOAPDeviceMediatedType {
kataDevice.Type = kataVfioApDevType
coldPlugVFIO := (c.sandbox.config.HypervisorConfig.ColdPlugVFIO != config.NoPort)
if coldPlugVFIO && c.sandbox.config.VfioMode == config.VFIOModeVFIO {
// A new device type is required for cold-plugging VFIO-AP.
// The VM guest should handle this differently from hot-plugging VFIO-AP
// (e.g., wait_for_ap_device).
// Note that a device already exists for cold-plugging VFIO-AP
// at the time the device type is checked.
kataDevice.Type = kataVfioApColdDevType
}
kataDevice.Options = dev.APDevices
} else {