The Svukte ISA extension has been approved for fast-track development. https://lf-riscv.atlassian.net/browse/RVS-2977 And there are Linux patches for the Svukte that are under review. https://lore.kernel.org/kvm/20240920-dev-maxh-svukte-rebase-v1-0-7864a88a6...@sifive.com/T/#mf70fcb22cd2987ad268c0efee9b8583197d3cb4f
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. Refer to the draft of svukte extension from: https://github.com/riscv/riscv-isa-manual/pull/1564 * Refactor the code base-commit: 27652f9ca9d831c67dd447346c6ee953669255f0 [v1] * Add svukte extension Fea.Wang (5): target/riscv: Add svukte extension capability variable target/riscv: Support senvcfg[UKTE] bit when svukte extension is enabled target/riscv: Support hstatus[HUKTE] bit when svukte extension is enabled target/riscv: Check memory access to meet svuket rule target/riscv: Expose svukte ISA extension target/riscv/cpu.c | 2 ++ target/riscv/cpu_bits.h | 2 ++ target/riscv/cpu_cfg.h | 1 + target/riscv/cpu_helper.c | 57 +++++++++++++++++++++++++++++++++++++++ target/riscv/csr.c | 7 +++++ 5 files changed, 69 insertions(+) -- 2.34.1
