Hi Anup, Atish, On Fri, 2 Aug 2019, Atish Patra wrote: > From: Anup Patel <anup.patel@xxxxxxx> > > This patch adds riscv_isa integer to represent ISA features common > across all CPUs. The riscv_isa is not same as elf_hwcap because > elf_hwcap will only have ISA features relevant for user-space apps > whereas riscv_isa will have ISA features relevant to both kernel > and user-space apps. > > One of the use case is KVM hypervisor where riscv_isa will be used > to do following operations: > > 1. Check whether hypervisor extension is available > 2. Find ISA features that need to be virtualized (e.g. floating > point support, vector extension, etc.) > > Signed-off-by: Anup Patel <anup.patel@xxxxxxx> > Signed-off-by: Atish Patra <atish.patra@xxxxxxx> Do you have any opinions on how this patch might change for the Z-prefix extensions? This bitfield approach probably won't scale, and with the EXPORT_SYMBOL(), it might be worth trying to put together a approach that would work over the long term? - Paul
