Re: [PATCH v2] target/riscv: fix VS interrupts forwarding to HS

[Alistair Francis]

On Tue, May 4, 2021 at 6:45 AM Jose Martins <josemartins90@gmail.com> wrote:
>
> VS interrupts (2, 6, 10) were not correctly forwarded to hs-mode when
> not delegated in hideleg (which was not being taken into account). This
> was mainly because hs level sie was not always considered enabled when
> it should. The spec states that "Interrupts for higher-privilege modes,
> y>x, are always globally enabled regardless of the setting of the global
> yIE bit for the higher-privilege mode." and also "For purposes of
> interrupt global enables, HS-mode is considered more privileged than
> VS-mode, and VS-mode is considered more privileged than VU-mode".
>
> These interrupts should be treated the same as any other kind of
> exception. Therefore, there is no need to "force an hs exception" as the
> current privilege level, the state of the global ie and of the
> delegation registers should be enough to route the interrupt to the
> appropriate privilege level in riscv_cpu_do_interrupt. Also, these
> interrupts never target m-mode, which is  guaranteed by the hardwiring
> of the corresponding bits in mideleg.
>
> Signed-off-by: Jose Martins <josemartins90@gmail.com>
> ---
> Alistair, I sent the previous version of this patch a year ago (!).
> After our brief exchange on wether we should considered HS a higher
> privilege mode than VS (the spec was updated to clarify this in the
> meantime) you asked me for a small last tweak  before accepting
> the patch. This completely slipped my mind, and I only noticed I hadn't
> submitted the final version of the patch a few weeks ago. For this, my
> apologies. When I took a deeper look at it again, I found some other issues
> with the patch so I decided to go for a deeper refactoring.
>
>  target/riscv/cpu_helper.c | 28 ++++++++--------------------
>  1 file changed, 8 insertions(+), 20 deletions(-)
>
> diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
> index 21c54ef561..592d4642be 100644
> --- a/target/riscv/cpu_helper.c
> +++ b/target/riscv/cpu_helper.c
> @@ -38,36 +38,24 @@ int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
>  #ifndef CONFIG_USER_ONLY
>  static int riscv_cpu_local_irq_pending(CPURISCVState *env)
>  {
> -    target_ulong irqs;
> +    target_ulong virt_enabled = riscv_cpu_virt_enabled(env);
>
>      target_ulong mstatus_mie = get_field(env->mstatus, MSTATUS_MIE);
>      target_ulong mstatus_sie = get_field(env->mstatus, MSTATUS_SIE);
> -    target_ulong hs_mstatus_sie = get_field(env->mstatus_hs, MSTATUS_SIE);
>
> -    target_ulong pending = env->mip & env->mie &
> -                               ~(MIP_VSSIP | MIP_VSTIP | MIP_VSEIP);
> -    target_ulong vspending = (env->mip & env->mie &
> -                              (MIP_VSSIP | MIP_VSTIP | MIP_VSEIP));
> +    target_ulong pending = env->mip & env->mie;
>
>      target_ulong mie    = env->priv < PRV_M ||
>                            (env->priv == PRV_M && mstatus_mie);
>      target_ulong sie    = env->priv < PRV_S ||
>                            (env->priv == PRV_S && mstatus_sie);
> -    target_ulong hs_sie = env->priv < PRV_S ||
> -                          (env->priv == PRV_S && hs_mstatus_sie);
> +    target_ulong hsie   = virt_enabled || sie;
> +    target_ulong vsie   = virt_enabled && sie;
>
> -    if (riscv_cpu_virt_enabled(env)) {
> -        target_ulong pending_hs_irq = pending & -hs_sie;
> -
> -        if (pending_hs_irq) {
> -            riscv_cpu_set_force_hs_excep(env, FORCE_HS_EXCEP);

If we no longer need this function then it and related functions
should be remove.

Alistair

> -            return ctz64(pending_hs_irq);
> -        }
> -
> -        pending = vspending;
> -    }
> -
> -    irqs = (pending & ~env->mideleg & -mie) | (pending &  env->mideleg & 
> -sie);
> +    target_ulong irqs =
> +            (pending & ~env->mideleg & -mie) |
> +            (pending &  env->mideleg & ~env->hideleg & -hsie) |
> +            (pending &  env->mideleg &  env->hideleg & -vsie);
>
>      if (irqs) {
>          return ctz64(irqs); /* since non-zero */
> --
> 2.25.1
>
>