[PATCH RFC 0/3] riscv: add Svukte extension

[Max Hsu]

RISC-V privileged spec will be added with Svukte extension [1]

Svukte introduce senvcfg.UKTE and hstatus.HUKTE bitfield.
which makes user-mode access to supervisor memory raise page faults
in constant time, mitigating attacks that attempt to discover the
supervisor software's address-space layout.

The following patches add
- dt-binding of Svukte ISA string
- CSR bit definition, ISA detection, senvcfg.UKTE enablement in kernel
- KVM ONE_REG support for Svukte extension

This patch series is based on v6.11

Link: https://github.com/riscv/riscv-isa-manual/pull/1564 [1]

Signed-off-by: Max Hsu <max.hsu at sifive.com>

---
Max Hsu (3):
      dt-bindings: riscv: Add Svukte entry
      riscv: Add Svukte extension support
      riscv: KVM: Add Svukte extension support for Guest/VM

 Documentation/devicetree/bindings/riscv/extensions.yaml | 7 +++++++
 arch/riscv/include/asm/csr.h                            | 2 ++
 arch/riscv/include/asm/hwcap.h                          | 1 +
 arch/riscv/include/uapi/asm/kvm.h                       | 1 +
 arch/riscv/kernel/cpufeature.c                          | 4 ++++
 arch/riscv/kvm/vcpu_onereg.c                            | 1 +
 6 files changed, 16 insertions(+)
---
base-commit: 186617d883560848f801732bfecefa0c2f702a0f
change-id: 20240920-dev-maxh-svukte-rebase-ce96dba93381

Best regards,
-- 
Max Hsu <max.hsu at sifive.com>