add Windows (WHP) cross-compilation support#122
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Introduce a dedicated Windows build target (`make OS=Windows`) that cross-compiles libkrunfw.dll for use with the Windows Hypervisor Platform (WHP). - Add config-libkrunfw-windows_x86_64 with Hyper-V guest enlightenments (CONFIG_HYPERV, CONFIG_HYPERV_TIMER, CONFIG_HYPERV_UTILS) so the guest kernel can leverage WHP paravirtualization. - Make bin2cbundle.py accept an --os flag to select page alignment: 4K for Windows (matching x86_64 WHP page granularity) and 64K (the original default) for Linux/macOS, avoiding InvalidGuestAddress errors caused by alignment mismatches. - Update the Makefile to handle the full Windows pipeline: select the Windows kernel config, invoke bin2cbundle.py with the correct OS, and link with x86_64-w64-mingw32-gcc using the appropriate flags (--kill-at, --nxcompat). - Document the Windows cross-compilation workflow in README.md. Signed-off-by: lstocchi <lstocchi@redhat.com>
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This PR introducess Windows support to generate a libkrunfw.dll for use with the Windows Hypervisor Platform (WHP).
The windows config is just a copy of
config-libkrunfw_x86_64with the addition of hyperv modules. It can be certainly optimized (i think at kvm-centric modules) but i don't plan to look at it in the next future. At least this is a first step that can be improved later.