On Wed, Aug 26, 2026 at 04:04:51PM -0700, Sean Christopherson wrote:
> This is a big pile of cleanups and refactoring to prepare for PPC support in
> KVM selftests. PPC has paging modes that require multi-page page tables, and
> those page tables need to be naturally aligned. The original proposal was to
> plumb in an @align param to the page allocators[*], but I didn't love the idea
> of adding another rarely used param to the allocators.
>
> Reworking the APIs to take a region type requires a fair bit of churn, and was
> more painful than expected as I didn't realize just how many one-off tests did
> weird things, but overall I think it's worth it? If only to keep cutting down
> on the use of magic memslot numbers in tests.
>
> This needs explicit testing on s390. I tested on arm64 and x86, and given the
> number of failures I had to wade through, I wouldn't be at all suprised if I
> broke something subtle on s390 as well.
>
> I'm less concerned about RISC-V and LoongArch as they don't have any custom
> tests that are affected (which is where I got burned).
I ran kvm_page_table_test with this series applied on Grace CPUs.
Passes across all the arm64 guest modes supported.
Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
>
> [*] https://lore.kernel.org/all/df86b5ccdbdafc3509d9538bd5e6796737bab2db.1781093720.git.ritesh.list@gmail.com
>
> Nicholas Piggin (1):
> KVM: selftests: Use goto instead of do-while to retry finding unused
> physical pages
>
> Sean Christopherson (19):
> KVM: selftests: Use MEM_REGION_PT memslot instead of '0' for s390
> regions/segments
> KVM: selftests: Bump the minimum GPA for page tables to 0x200000
> KVM: selftests: Use vm_alloc_page_table() to allocate LoongArch page
> tables
> KVM: selftests: Rename "num" param to "nr_pages" for physical page
> allocators
> KVM: selftests: Extend page allocator to support naturally aligned
> allocations
> KVM: selftests: Make the single-page allocator APIs static inline
> KVM: selftests: Use the innermost page allocator API in the memslot
> perf test
> KVM: selftests: Use the innermost page allocator API in s390's IRQ
> routing test
> KVM: selftests: Add a wrapper API to allocate multiple page table
> pages
> KVM: selftests: Initialize vm->memslots[] with invalid memslots during
> creation
> KVM: selftests: Add APIs to override memory region types with custom
> memslots
> KVM: selftests: Add TEST_EXTRA memory region type for "special"
> memslots
> KVM: selftests: Use TEST_EXTRA region in arm64's vGIC LPI stress test
> KVM: selftests: Use TEST_EXTRA region in x86's smaller MAXPHYADDR test
> KVM: selftests: Use TEST_EXTRA region in set memory region test
> KVM: selftests: Take the memory region type, not memslot, in page
> allocators
> KVM: selftests: Use TEST_ASSERT(), not assert(), in
> vm_get_mem_region()
> KVM: selftests: Automatically pick min_gpa for allocations based on
> region type
> KVM: selftests: Add arch hook to force page tables to be naturally
> aligned
>
> .../selftests/kvm/arm64/page_fault_test.c | 18 ++-
> .../selftests/kvm/arm64/vgic_lpi_stress.c | 19 ++-
> .../testing/selftests/kvm/include/kvm_util.h | 106 +++++++++++++--
> tools/testing/selftests/kvm/include/x86/smm.h | 2 +-
> .../selftests/kvm/lib/arm64/processor.c | 4 +-
> tools/testing/selftests/kvm/lib/kvm_util.c | 127 +++++++++++-------
> .../selftests/kvm/lib/loongarch/processor.c | 5 +-
> .../selftests/kvm/lib/riscv/processor.c | 4 +-
> .../selftests/kvm/lib/s390/processor.c | 7 +-
> .../testing/selftests/kvm/lib/x86/processor.c | 15 ++-
> .../testing/selftests/kvm/memslot_perf_test.c | 3 +-
> tools/testing/selftests/kvm/s390/cmma_test.c | 19 +--
> .../testing/selftests/kvm/s390/irq_routing.c | 2 +-
> .../selftests/kvm/set_memory_region_test.c | 8 +-
> .../x86/smaller_maxphyaddr_emulation_test.c | 9 +-
> 15 files changed, 219 insertions(+), 129 deletions(-)
>
>
> base-commit: 76671054f9a1ff6abb976583cd8da37650acdc97
> --
> 2.55.0.887.g758fc8c411-goog
>