On Thu, Jul 27, 2023 at 12:54:36PM -0700, Nuno Das Neves wrote: > In x86 hyperv-tlfs, HV_REGISTER_ prefix is used to indicate MSRs > accessed via rdmsrl/wrmsrl. But in ARM64, HV_REGISTER_ instead indicates > VP registers accessed via get/set vp registers hypercall. > > This is due to HV_REGISTER_* names being used by hv_set/get_register, > with the arch-specific version delegating to the appropriate mechanism. > > The problem is, using prefix HV_REGISTER_ for MSRs will conflict with > VP registers when they are introduced for x86 in future. > > This patch solves the issue by: > > 1. Defining all the x86 MSRs with a consistent prefix: HV_X64_MSR_. > This is so HV_REGISTER_ can be reserved for VP registers. > > 2. Change the non-arch-specific alias used by hv_set/get_register to > HV_MSR_. This is also happens to be the same name HyperV uses for this > purpose. > > Signed-off-by: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx> Assuming the prior (private?) discussion with Michael led to this patch: Acked-by: Wei Liu <wei.liu@xxxxxxxxxx>
