nerdctl run --isolation hyperv --memory fails: UVM memory annotation is set in bytes #5337

nerdctl run --isolation hyperv --memory 2g <image> fails on Windows Server 2025 (nerdctl 2.4.2):

hcs::CreateComputeSystem <id>@vm: winapi error #2147749931

The Microsoft-Windows-Hyper-V-Compute-Admin log shows "Memory virtual quantity above maximum."

pkg/cmd/container/run_windows.go writes mem64 (bytes, from units.RAMInBytes) into
io.microsoft.virtualmachine.computetopology.memory.sizeinmb. hcsshim documents this
annotation as MB: "the caller MUST use MB or sizing will be wrong".

With --memory 2g the annotation in the OCI spec is 2147483648.
--memory 2048 (2048 bytes) gives a 2047 MB utility VM.
--memory 2g --annotation io.microsoft.virtualmachine.computetopology.memory.sizeinmb=2048 works.

Suggested fix: fmt.Sprintf("%v", mem64/(1024*1024)).