Re: [PATCH v5 1/4] KVM: selftests: Add KVM selftests header files for LoongArch

[Sean Christopherson]

On Tue, Dec 12, 2023, zhaotianrui wrote:
> Hi, Sean:
> 
> I want to change the definition of  DEFAULT_GUEST_TEST_MEM in the common
> file "memstress.h", like this:
> 
>  /* Default guest test virtual memory offset */
> +#ifndef DEFAULT_GUEST_TEST_MEM
>  #define DEFAULT_GUEST_TEST_MEM		0xc0000000
> +#endif
> 
> As this address should be re-defined in LoongArch headers.

Why?  E.g. is 0xc0000000 unconditionally reserved, not guaranteed to be valid,
something else?

> So, do you have any suggesstion?

Hmm, I think ideally kvm_util_base.h would define a range of memory that can be
used by tests for arbitrary data.  Multiple tests use 0xc0000000, which is not
entirely arbitrary, i.e. it doesn't _need_ to be 0xc0000000, but 0xc0000000 is
convenient because it's 32-bit addressable and doesn't overlap reserved areas in
other architectures.