[RFC PATCH 1/6] arm64: rsi: Add RSI host call structure and helper function

[Kameron Carr]

On Thursday, June 18, 2026 10:46 AM, Michael Kelley wrote:
> From: Kameron Carr <kameroncarr at linux.microsoft.com> Sent: Tuesday, June
> 9, 2026 11:10 AM
> > diff --git a/arch/arm64/include/asm/rsi_smc.h
> b/arch/arm64/include/asm/rsi_smc.h
> > index e19253f96c940..ffea93340ed7f 100644
> > --- a/arch/arm64/include/asm/rsi_smc.h
> > +++ b/arch/arm64/include/asm/rsi_smc.h
> > @@ -142,6 +142,12 @@ struct realm_config {
> >  	 */
> >  } __aligned(0x1000);
> >
> > +struct rsi_host_call {
> > +	u16 immediate;
> 
> I don't see the "immediate" used anywhere in this patch set.
> Is it always zero for the Hyper-V use cases?  Just curious ...

Yes, the immediate value is always zero for Hyper-V host calls.

-- Kameron