* Xin Li <x...@zytor.com> wrote:
> On 5/15/2025 10:54 AM, Xin Li wrote:
> > On 5/15/2025 8:27 AM, Ingo Molnar wrote:
> > >
> > > * Xin Li (Intel) <x...@zytor.com> wrote:
> > >
> > > > Convert a native_wrmsr() use to native_wrmsrq() to zap meaningless type
> > > > conversions when a u64 MSR value is splitted into two u32.
> > > >
> > >
> > > BTW., at this point we should probably just replace
> > > sev_es_wr_ghcb_msr() calls with direct calls to:
> > >
> > > native_wrmsrq(MSR_AMD64_SEV_ES_GHCB, ...);
> > >
> > > as sev_es_wr_ghcb_msr() is now basically an open-coded native_wrmsrq().
> > >
> >
> > I thought about it, however it looks to me that current code prefers not
> > to spread MSR_AMD64_SEV_ES_GHCB in 17 callsites. And anyway it's a
> > __always_inline function.
> >
> > But as you have asked, I will make the change unless someone objects.
>
> Hi Ingo,
>
> I took a further look and found that we can't simply replace
> sev_es_wr_ghcb_msr() with native_wrmsrq(MSR_AMD64_SEV_ES_GHCB, ...).
>
> There are two sev_es_wr_ghcb_msr() definitions. One is defined in
> arch/x86/boot/compressed/sev.h and it references boot_wrmsr() defined in
> arch/x86/boot/msr.h to do MSR write.
Ah, indeed, it's also a startup code wrapper, which wrmsrq() doesn't
have at the moment. Fair enough.
Thanks,
Ingo
