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UID:pretalx-eu-summit-2026-B7EASJ@cfp.riscv-europe.org
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DESCRIPTION:The RVA23 profile\, ratified in October 2024\, defines a mandat
 ory baseline of 33 U-mode and 25 S-mode extensions. During the upstream en
 ablement of SpacemiT K3\, I identified gaps in the kernel's RVA23 extensio
 n coverage and submitted patches to address them. After several revision c
 ycles\, the patches were merged into Linux v7.0\, raising coverage from 69
 % to 100%.\n\nThis talk will examine how the Linux kernel community approa
 ches RISC-V extension support - the design principles behind accepting new
  extensions into the kernel\, and how the maintainers manage the growing c
 omplexity of the RISC-V extension landscape.\n\nI will then present two pa
 tchsets currently under review for Linux v7.1: my series adding cpufeature
  parsing and hwprobe export for RVA23 extensions\, and Andrew Jones' (Qual
 comm) RFC introducing rva23u64 base behavior detection. I will discuss the
  key architectural decisions in these patches\, the review feedback receiv
 ed\, and the current status.\n\nDepending on the upstream timeline\, these
  may already be merged by the Summit\, or still in progress - either way\,
  the talk will reflect the latest state of the kernel community's work.\n\
 nAchieving complete RVA23 support in mainline Linux is a prerequisite for 
 distributions to ship generic RISC-V images that work across compliant har
 dware\, reducing fragmentation. We hope to invite RISC-V kernel community 
 members at the Summit for an open discussion on remaining challenges and f
 uture profile evolution.
DTSTAMP:20260522T162350Z
LOCATION:Plenary
SUMMARY:RVA23 Profile Support in Linux Kernel: From Extension Definitions t
 o Userspace Export - Guodong Xu
URL:https://cfp.riscv-europe.org/eu-summit-2026/talk/B7EASJ/
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