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 base-commit: 2209cae121e5da3cfbdb9dd4b06d52d0ef66ea69 [v5] * Update the warning log and the commit message [v4] * Add a svukte extension check in RV32. * Refine the code. [v3] * Fix some typos * Refine code by separating a function into two dedicated functions. * Follow the riscv,isa order [v2] * Refactor the code [v1] * Add svukte extension Fea.Wang (6): 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 svukte rule target/riscv: Expose svukte ISA extension target/riscv: Check svukte is not enabled in RV32 target/riscv/cpu.c | 2 ++ target/riscv/cpu_bits.h | 2 ++ target/riscv/cpu_cfg.h | 1 + target/riscv/cpu_helper.c | 55 ++++++++++++++++++++++++++++++++++++++ target/riscv/csr.c | 7 +++++ target/riscv/tcg/tcg-cpu.c | 5 ++++ 6 files changed, 72 insertions(+) -- 2.34.1
