[PATCH v2 01/20] KVM: selftests: Use MEM_REGION_PT memslot instead of '0' for s390 regions/segments

[Claudio Imbrenda]

On Wed,  2 Sep 2026 09:41:04 -0700
Sean Christopherson <seanjc at google.com> wrote:

> Use MEM_REGION_PT to indirectly specify memslot '0' instead of hardcoding
> the memslot in s390's virtual memory allocator, as a first step towards
> taking the allocation type instead of the exact, raw memslot in the
> physical memory allocator.
> 
> Note, the only tests that set MEM_REGION_PT to a memslot other than '0' are
> arm64-only, i.e. s390 always uses memslot '0' for page tables.
> 
> No functional change intended.
> 
> Tested-by: Itaru Kitayama <itaru.kitayama at fujitsu.com>
> Signed-off-by: Sean Christopherson <seanjc at google.com>

Acked-by: Claudio Imbrenda <imbrenda at linux.ibm.com>

> ---
>  tools/testing/selftests/kvm/lib/s390/processor.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kvm/lib/s390/processor.c b/tools/testing/selftests/kvm/lib/s390/processor.c
> index a9adb3782b35..fb9dab92d4d1 100644
> --- a/tools/testing/selftests/kvm/lib/s390/processor.c
> +++ b/tools/testing/selftests/kvm/lib/s390/processor.c
> @@ -39,7 +39,8 @@ static u64 virt_alloc_region(struct kvm_vm *vm, int ri)
>  	u64 taddr;
>  
>  	taddr = vm_phy_pages_alloc(vm,  ri < 4 ? PAGES_PER_REGION : 1,
> -				   KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0);
> +				   KVM_GUEST_PAGE_TABLE_MIN_PADDR,
> +				   vm->memslots[MEM_REGION_PT]);
>  	memset(addr_gpa2hva(vm, taddr), 0xff, PAGES_PER_REGION * vm->page_size);
>  
>  	return (taddr & REGION_ENTRY_ORIGIN)