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Support for VMGenID device on x86 microVMs #4487

Merged
merged 8 commits into from
Apr 9, 2024
Merged

Support for VMGenID device on x86 microVMs #4487

merged 8 commits into from
Apr 9, 2024

Commits on Apr 9, 2024

  1. refactor: avoid clones of GuestMemoryMmap when restoring MMIO devices 

    Use a reference to the GuestMemoryMmap rather than the object itself
when restoring MMIO devices. This will avoid us a few clone() operations
later on when we add support for restoring VMGenID, where we will need
to pass information about the memory as well.

Signed-off-by: Babis Chalios <[email protected]>
    @bchalios
    bchalios committed Apr 9, 2024
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  2. acpi: add VMGenID support for x86_64 

    Add support for the Virtual Machine Generation ID (VMGenID) device that
allows notifying the guest about snapshot resume events. The device
itself allocates one page of guest memory and an IRQ line. It stores a
16 bytes cryptographically random number (generation ID) at the
beginning of this page. Once the microVM resumes from a snapshot, it
writes a new 16-byte generation ID and sends an interrupt to the device.

Also add support for the Generic Event Device, an ACPI device which
handles IRQ lines allocated to ACPI devices and routes them as
ACPI notifications to the devices the belong to.

VMGenID state is saved in Firecracker snapshots. This renders the
current snapshot format incompatible with all previous snapshot
versions. Bump snapshot version to 2.0.0 to reflect that.

Signed-off-by: Babis Chalios <[email protected]>
    @bchalios
    bchalios committed Apr 9, 2024
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  3. fix(test): set max device to 18 in test_max_devices 

    We now reserve one IRQ for the VMGenID device, so we have one less IRQ
available for VirtIO devices.

Signed-off-by: Babis Chalios <[email protected]>
    @bchalios
    bchalios committed Apr 9, 2024
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  4. test: allow using 6.1 kernel in selected tests 

    At the moment, we filter out 6.1 guest kernel in all tests apart from
PTP on Graviton. Add a new filter that allows select any kernel that
exists in our CI artifacts folder and use it to create a pytest fixture
for guest kernel 6.1, which works independently of the platform we run
on.

Signed-off-by: Babis Chalios <[email protected]>
    @bchalios
    bchalios committed Apr 9, 2024
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  5. test(vmgenid): integration test for VMGenID kernel notification 

    Add an integration test that launches a microVM, snapshots it repeatedly
and checks for the existence of the message that the kernel emits every
time it receives the VMGenID notification.

Signed-off-by: Babis Chalios <[email protected]>
    @bchalios
    bchalios committed Apr 9, 2024
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  6. fix(test): wait for microVM to boot before snapshotting 

    In test_vulnerabilities.py we have various tests that check whether a
condition holds after resuming from a snapshot. These checks seem to
consistently fail if we take a snapshot before letting the guest kernel
boot.

Introduce an ssh command to ensure that the guest has booted before
taking the snapshot so that we avoid the issue.

Signed-off-by: Babis Chalios <[email protected]>
    @bchalios
    bchalios committed Apr 9, 2024
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  7. acpi: add documentation about VMGenID 

    Extend our current documentation for snapshotting and entropy
recommendations with context about VMGenID. Mention the available
VMGenID features depending on Linux version and also provide
recommendations for entropy on VM clones based on VMGenID availability.

Also, add CHANGELOG entry for VMGenID support.

Signed-off-by: Babis Chalios <[email protected]>
    @bchalios
    bchalios committed Apr 9, 2024
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  8. Merge branch 'main' into vmgenid_x86_64

    @bchalios
    bchalios authored Apr 9, 2024
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