Re: [PATCH 1/1] target/riscv: fix VS interrupts forwarding to HS

[Alistair Francis]

On Fri, May 1, 2020 at 11:57 AM Jose Martins <address@hidden> wrote:
>
> Reached out to Andrew Waterman. This was his response:
>
> "I think the encoding of the privileged modes is a red herring.  HS is
> inherently more privileged than VS, since it controls memory
> protection and interrupt delegation for VS.
> Certainly the intent is that HS-mode interrupts are always enabled
> while executing in VS-mode.  Otherwise, badly behaved VS-mode software
> could starve HS-mode of interrupts."

Ok, so in which case the hs_sie variable should be removed.

Alistair

>
> So my assumption was correct.
>
> Jose
>
> On Thu, 30 Apr 2020 at 22:47, Jose Martins <address@hidden> wrote:
> >
> > > I'm not sure HS is a higher privilege mode.
> > >
> > > HS is privilege encoding 1, which is the same as VS (VU is obviously 
> > > lower).
> >
> > I just checked the spec and it doesn't actually, explicitly state that
> > HS is a higher-privilege mode than VS. I thought this was something
> > implicit, but you might be right. I'll try to reach out to the spec
> > authors to clarify this.
> >
> > Jose