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Similar to live migration, loading a VM from some saved state (aka snapshot) is also an event that calls for clock adjustments in the guest. However, guests might want to take more actions as a response to such events, e.g. as discarding UUIDs, resetting network connections, reseeding entropy pools, etc. These are actions that guests don't typically take during live migration, so add a new field in the vmclock_abi called vm_generation_counter which informs the guest about such events. Hypervisor advertises support for vm_generation_counter through the VMCLOCK_FLAG_VM_GEN_COUNTER_PRESENT flag. Users need to check the presence of this bit in vmclock_abi flags field before using this flag. Signed-off-by: Babis Chalios <bchalios@amazon.es> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: David Woodhouse <dwmw@amazon.co.uk> Tested-by: Takahiro Itazur <itazur@amazon.com> Link: https://patch.msgid.link/20260130173704.12575-2-itazur@amazon.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>