DRAFT: Add support for virtio-pci transport #5240
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❌ Your project check has failed because the head coverage (76.96%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage. Additional details and impacted files@@ Coverage Diff @@
## feature/pcie #5240 +/- ##
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- Coverage 79.23% 76.96% -2.28%
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Files 262 265 +3
Lines 29347 30471 +1124
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+ Hits 23254 23451 +197
- Misses 6093 7020 +927
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We need the new KvmIrqRouting FamStruct wrapper from kvm-bindings, which though forces us to update vmm-sys-util to 0.14.0 and also bump all downstream dependencies of vmm-sys-util to use that version. Signed-off-by: Babis Chalios <[email protected]>
We'd like to be able to store Vm within an atomic reference so we can pass it around and share it with other components. The main issue with doing this change is that we need Vm to be `mut` during initialization and the builder.rs code was creating Vmm with Vm embedded in it. To solve this, we break down the initialization of the Vmm object. We first create its individual parts (Vm, Kvm and DeviceManager), perform any necessary initialization logic on Vm and once this done add it within an Arc. Signed-off-by: Babis Chalios <[email protected]>
Add logic to track the device interrupts used by the microVM. This is not strictly needed right now, but we will need it when adding support for MSI-X interrupts. MSI-X interrupts are configured at runtime and we need to interact with KVM to set the interruput routes. To do it, we need to keep track all of the interrupts the VM is using. Signed-off-by: Babis Chalios <[email protected]>
Enable Vm to vend and manage MSI/MSI-X interrupts. This adds the logic to create a set of MSI vectors and then handle their lifetime. Signed-off-by: Babis Chalios <[email protected]>
Add a VirtIO PCI transport implementation. Nothing uses it at the moment. This requires a few changes in our vended pci and vm-device crates. Signed-off-by: Babis Chalios <[email protected]>
Merge the device-related errors that DeviceManager might return. This way, we can avoid adding yet another error type for PCI devices and reduce some the variants of StartMicrovmError. Suggested-by: Egor Lazarchuk <[email protected]> Signed-off-by: Babis Chalios <[email protected]>
Commit d8c2714 (refactor: use VirtioInterrupt in VirtIO devices) which refactored devices to use new VirtioInterrupt type introduced a bug with the index used to trigger a queue interrupt. Instead of using the actual queue index, we were using the index of the used descriptor. Signed-off-by: Babis Chalios <[email protected]>
Apparently, PCI needs Queue::size to be initialized to the maximum possible size supported by the device, otherwise initialization fails. Signed-off-by: Babis Chalios <[email protected]>
Remove the flags in FADT that were declaring we do not support MSI and PCI ASPM. Signed-off-by: Babis Chalios <[email protected]>
Define thiserror::Error and displaydoc::Display for various error types in the vended PCI crate. This way we can embed them in our error types downstream. Also export `msix::Error` which was private. Signed-off-by: Babis Chalios <[email protected]>
Create VirtIO devices using the PCI transport layer when user launched microVM with --enable-pci. Signed-off-by: Babis Chalios <[email protected]>
We are now calling KVM_CHECK_EXTENSION for checking the KVM_CAP_MSI_DEVID capability. We are also calling KVM_SET_GSI_ROUTING to set the interrupts routes and KVM_IRQFD to set/unset interrupt lines. Signed-off-by: Babis Chalios <[email protected]>
Add some unit tests to PciSegment. We now test that the next_device_bdf() method and the initialization logic work as expected. We also check that the configuration space of the PCI segment is correctly registered with the MMIO and, on x86, PIO bus. Signed-off-by: Babis Chalios <[email protected]>
vm-allocator now allows us to (De)serialize IdAllocator and AddressAllocator types. Add ResourceAllocator in DeviceManager snapshot state and restore it when loading a snapshot. Like this we can avoid doing the ExactMatch allocations during snapshot resumes for reserving the exact same MMIO ranges. Moreover, change DeviceManager and PciDevices to provide save/restore functionality via the Persist trait. Like that we can avoid first creating the objects and then restoring their state, overwriting their fields. Signed-off-by: Babis Chalios <[email protected]>
Device Debug for some of the types we are consuming and also export some of the types that were effectively private to the containing module. Signed-off-by: Babis Chalios <[email protected]>
VirtIO MMIO restore logic activates the device the moment we restore the device state, if the device was activated when snapshotted. Move the activation responsibility to the logic the restores the MMIO transport. The reason for this change is that that's how it will be done for the PCI transport. Unifying this will allow us reusing the same types for restoring the non-transport state of devices. Note that we needed to change the way Net devices are saved/restored. RxBuffer type of Net devices holds RX descriptors that we have parsed from the Queue ahead of time. The way we restored this info was manipulating the queue to re-parse the RX descriptors during the restore phase. However, we need the device to be activated to do so, which now isn't. So, instead of storing this info inside the snapshot make sure we have flushed everything before taking the snapshot. Also, simplify a bit the types that we use for serializing/deserializing the state of a device. Signed-off-by: Babis Chalios <[email protected]>
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