On Wed, 2025-06-11 at 22:01 +0800, Xiaoyao Li wrote: > > > So, when the TDX guest calls MapGPA and KVM finds userspace doesn't opt-in > > > KVM_HC_MAP_GPA_RANGE, just return error to userspace? > > > > Why can't KVM just do what it already does, and return an error to the > > guest? > > Because GHCI requires it must be supported. No matter with the old GHCI > that only allows <GetTdVmCallInfo> to succeed and the success of > <GetTdVmCallInfo> means all the TDVMCALL leafs are support, or the > proposed updated GHCI that defines <MapGpa> as one of the base API/leaf, > and the base API must be supported by VMM. > > Binbin wants to honor it. But KVM doesn't need to support all ways that userspace could meet the GHCI spec. If userspace opts-in to the exit, they will meet the spec. If they configure KVM differently then they wont, but this is their decision.
