On Mon, Jan 03, 2022 at 06:05:41PM +0000, Marc Zyngier wrote: > Andrew Jones <drjones@xxxxxxxxxx> wrote: > > > > Thanks for considering a documentation update. In this case, though, I > > think we should delete the "TCG VCPU Features" pauth paragraph, rather > > than add a new "KVM VCPU Features" pauth paragraph. We don't need to > > document each CPU feature. We just document complex ones, like sve*, > > KVM specific ones (kvm-*), and TCG specific ones (now only pauth-impdef). > > Sure, works for me. Do we need to keep a trace of the available > options? For arm we need to extend target/arm/helper.c:arm_cpu_list() to output the possible flags like x86 does. On x86 doing this qemu-system-x86_64 -cpu help not only gives us a list of cpu types, but also a list of flags we can provide to the cpus (although not all flags will work on all cpus...) On arm doing this qemu-system-aarch64 -cpu help only gives us a list of cpu types. > I'm not sure how a user is supposed to find out about those > (I always end-up grepping through the code base, and something tells > me I'm doing it wrong...). The QMP stuff flies way over my head. > Indeed, currently grepping is less awkward than probing with QMP. With an extension to target/arm/helper.c:arm_cpu_list() we can avoid grepping too. I've just added this to my TODO [again]. It was there once already, but fell off the bottom... Thanks, drew
