Re: [PATCH v12 20/22] x86/virt/tdx: Allow SEAMCALL to handle #UD and #GP

[Peter Zijlstra]

On Wed, Jul 05, 2023 at 11:34:53AM +0000, Huang, Kai wrote:

> Yeah I think from long-term's view, since SEAMCALLs to support live migration
> pretty much uses all RCX/RDX/R8-R15 as input/output, it seems reasonable to
> unify all of them, although I guess there might be some special handling to
> VP.VMCALL and/or VP.ENTER, e.g., below:
> 
>         /* TDVMCALL leaf return code is in R10 */                              
>         movq %r10, %rax

Well, that's a problem fo whoever does tdcall(0, &args), no?

But did I say it had a crap calling convention already?