On Wed, Jun 28, 2023 at 03:34:05AM +0000, Huang, Kai wrote:
> On Wed, 2023-06-28 at 11:09 +0800, Chao Gao wrote:
> > > +/*
> > > + * Wrapper of __seamcall() to convert SEAMCALL leaf function error code
> > > + * to kernel error code. @seamcall_ret and @out contain the SEAMCALL
> > > + * leaf function return code and the additional output respectively if
> > > + * not NULL.
> > > + */
> > > +static int __always_unused seamcall(u64 fn, u64 rcx, u64 rdx, u64 r8, u64
> > > r9,
> > > + u64 *seamcall_ret,
> > > + struct tdx_module_output *out)
> > > +{
> > > + u64 sret;
> > > + int cpu;
> > > +
> > > + /* Need a stable CPU id for printing error message */
> > > + cpu = get_cpu();
> > > + sret = __seamcall(fn, rcx, rdx, r8, r9, out);
> > > + put_cpu();
> > > +
> > > + /* Save SEAMCALL return code if the caller wants it */
> > > + if (seamcall_ret)
> > > + *seamcall_ret = sret;
> >
> > Hi Kai,
> >
> > All callers in this series pass NULL for seamcall_ret. I am no sure if
> > you keep it intentionally.
>
> In this series all the callers doesn't need seamcall_ret.
I'm fine keeping it if it is needed by KVM TDX enabling. Otherwise, just
drop it.
> > > +
> > > + switch (sret) {
> > > + case 0:
> > > + /* SEAMCALL was successful */
> >
> > Nit: if you add
> >
> > #define TDX_SUCCESS 0
> >
> > and do
> >
> > case TDX_SUCCESS:
> > return 0;
> >
> > then the code becomes self-explanatory. i.e., you can drop the comment.
>
> If using this, I ended up with below:
>
> --- a/arch/x86/include/asm/tdx.h
> +++ b/arch/x86/include/asm/tdx.h
> @@ -23,6 +23,8 @@
> #define TDX_SEAMCALL_GP (TDX_SW_ERROR | X86_TRAP_GP)
> #define TDX_SEAMCALL_UD (TDX_SW_ERROR | X86_TRAP_UD)
>
> +#define TDX_SUCCESS 0
> +
>
> Hi Kirill/Dave/David,
>
> Are you happy with this?
Sure, looks good.
--
Kiryl Shutsemau / Kirill A. Shutemov
