Refer to the draft of svukte extension from:
https://github.com/riscv/riscv-isa-manual/pull/1564

Svukte provides a means to make user-mode accesses to supervisor memory
raise page faults in constant time, mitigating attacks that attempt to
discover the supervisor software's address-space layout.

Signed-off-by: Fea.Wang <fea.wang@sifive.com>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Jim Shu <jim.shu@sifive.com>
---
 target/riscv/cpu_cfg.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
index 96fe26d4ea..636b12e1c2 100644
--- a/target/riscv/cpu_cfg.h
+++ b/target/riscv/cpu_cfg.h
@@ -81,6 +81,7 @@ struct RISCVCPUConfig {
     bool ext_svinval;
     bool ext_svnapot;
     bool ext_svpbmt;
+    bool ext_svukte;
     bool ext_zdinx;
     bool ext_zaamo;
     bool ext_zacas;
-- 
2.34.1

On Tue, Sep 3, 2024 at 4:15 PM Fea.Wang <fea.wang@sifive.com> wrote:
>
> Refer to the draft of svukte extension from:
> https://github.com/riscv/riscv-isa-manual/pull/1564

We won't be able to merge this while the spec is just a pull request.
We need a fixes spec that we can point out with a version

Alistair

>
> Svukte provides a means to make user-mode accesses to supervisor memory
> raise page faults in constant time, mitigating attacks that attempt to
> discover the supervisor software's address-space layout.
>
> Signed-off-by: Fea.Wang <fea.wang@sifive.com>
> Reviewed-by: Frank Chang <frank.chang@sifive.com>
> Reviewed-by: Jim Shu <jim.shu@sifive.com>
> ---
>  target/riscv/cpu_cfg.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
> index 96fe26d4ea..636b12e1c2 100644
> --- a/target/riscv/cpu_cfg.h
> +++ b/target/riscv/cpu_cfg.h
> @@ -81,6 +81,7 @@ struct RISCVCPUConfig {
>      bool ext_svinval;
>      bool ext_svnapot;
>      bool ext_svpbmt;
> +    bool ext_svukte;
>      bool ext_zdinx;
>      bool ext_zaamo;
>      bool ext_zacas;
> --
> 2.34.1
>
>