v1.21.1
[pci] Support systems with multiple PCI root bridges
[efi] Use segment and bus number to identify PCI root bridge I/O protocol
[malloc] Rename malloc_dma() to malloc_phys()
[init] Show startup and shutdown function names in debug messages
[smbios] Add support for the 64-bit SMBIOS3 entry point
[xen] Skip probing of any unsupported device types