Re: [PATCH 2/4] KVM: riscv: selftests: Add exception handling support

[Sean Christopherson]

On Fri, Jul 28, 2023, Andrew Jones wrote:
> On Thu, Jul 27, 2023 at 03:20:06PM +0800, Haibo Xu wrote:
> > +void vm_init_trap_vector_tables(struct kvm_vm *vm);
> > +void vcpu_init_trap_vector_tables(struct kvm_vcpu *vcpu);
> 
> I think we should use a common name for these prototypes that the other
> architectures agree to and then put them in a common header. My vote for
> the naming is,

Just allocate the tables in kvm_arch_vm_post_create().  I've been meaning to
convert x86 and ARM, but keep getting distracted/waylaid by other things.

https://lore.kernel.org/all/Y8hCBOndYMD9zsDL@xxxxxxxxxx

>   void vm_init_vector_tables(struct kvm_vm *vm);
>   void vcpu_init_vector_tables(struct kvm_vcpu *vcpu);
> 
> > +
> > +typedef void(*handler_fn)(struct ex_regs *);
> > +void vm_install_exception_handler(struct kvm_vm *vm, int ec, handler_fn handler);
> 
> I'd also put this typedef

And rename it to (*exception_handler_fn).

> and prototype in a common header (with s/ec/vector/ to what you have here)

Hmm, yeah, I think it makes sense to let vm_install_exception_handler() be used
from common code.  the vector to be installed is inherently arch specific, but
it would be easy enough for a test to use #ifdeffery to define the correct vector.