Re: [PATCH v6 07/13] KVM: selftests: Change ____vm_create() to take struct kvm_vm_mem_params

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On Tue, Sep 06, 2022 at 06:09:24PM +0000, Ricardo Koller wrote:
> The vm_create() helpers are hardcoded to place most page types (code,
> page-tables, stacks, etc) in the same memslot #0, and always backed with
> anonymous 4K.  There are a couple of issues with that.  First, tests willing to
> differ a bit, like placing page-tables in a different backing source type must
> replicate much of what's already done by the vm_create() functions.  Second,
> the hardcoded assumption of memslot #0 holding most things is spreaded
> everywhere; this makes it very hard to change.
> 
> Fix the above issues by having selftests specify how they want memory to be
> laid out: define the memory regions to use for code, pt (page-tables), and
> data. Introduce a new structure, struct kvm_vm_mem_params, that defines: guest
> mode, a list of memory region descriptions, and some fields specifying what
> regions to use for code, pt, and data.
> 
> There is no functional change intended. The current commit adds a default
> struct kvm_vm_mem_params that lays out memory exactly as before. The next
> commit will change the allocators to get the region they should be using,
> e.g.,: like the page table allocators using the pt memslot.
> 
> Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
> Cc: Andrew Jones <andrew.jones@xxxxxxxxx>
> Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
> ---
>  .../selftests/kvm/include/kvm_util_base.h     | 51 +++++++++++++++-
>  .../selftests/kvm/lib/aarch64/processor.c     |  3 +-
>  tools/testing/selftests/kvm/lib/kvm_util.c    | 58 ++++++++++++++++---
>  3 files changed, 102 insertions(+), 10 deletions(-)
>

Reviewed-by: Andrew Jones <andrew.jones@xxxxxxxxx>



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