On Wed, Apr 22, 2020 at 12:57:33PM -0700, Michael Kelley wrote: > This series splits hyperv-tlfs.h into architecture independent and > architecture specific files so that the arch independent portion can > be shared between the x86/x64 and ARM64 code for Hyper-V. While the > Hyper-V team has not released a version of the TLFS document that > clearly specifies which portions of the interface are arch independent, > we can make a fairly good assessment based on implementation work done > to support Linux guests on Hyper-V on ARM64, and on private communication > with the Hyper-V team. Definitions are considered arch independent if > they are implemented by Hyper-V on both architectures (x86/x64 and ARM64), > even if they are currently needed by Linux code only on one architecture. > > Many definitions in hyperv-tlfs.h have historically contained "X64" in the > name, which doesn't make sense for architecture independent definitions. > While many of the occurrences of "X64" have already been removed, some > still remain in definitions that should be arch independent. The > split removes the "X64" from the definitions so that the arch > independent hyper-tlfs.h has no occurrences of "X64". However, to > keep this patch set separate from a wider change in the names, aliases > are added in the x86/x64 specific hyperv-tlfs.h so that existing code > continues to compile. The definitions can be fixed throughout the code > in a more incremental fashion in separate patches, and then the aliases > can be removed. > > Where it is not clear if definitions are arch independent, they have been > kept in the x86/x64 specific file. The Hyper-V team is aiming to have a > version of the TLFS document covering ARM64 by the end of calendar 2020, > so additional definitions may be moved into the arch independent portion > after the new TLFS document is released. > > The first two patches in the series clean up the existing hyperv-tlfs.h > file a bit by removing duplicate or unnecessary definitions so they are > not propagated across the split. The third patch does the split, and the > fourth patch adds new definitions that are needed on ARM64 but are generic. > > These changes have no functional impact. > > These patches are built against linux-next-20200415 Applied to hyperv-next. Thanks. Wei.
