[v8,0/4] KVM: selftests: Add LoongArch support

This patchset adds KVM selftests for LoongArch system, currently only
some common test cases are supported and pass to run. These testcase
are listed as following:
    coalesced_io_test
    demand_paging_test
    dirty_log_perf_test
    dirty_log_test
    guest_print_test
    hardware_disable_test
    kvm_binary_stats_test
    kvm_create_max_vcpus
    kvm_page_table_test
    memslot_modification_stress_test
    memslot_perf_test
    set_memory_region_test

This patchset originally is posted from zhaotianrui, I continue to work
on his efforts.

---
Changes in v8:
1. Porting patch based on the latest version.
2. For macro PC_OFFSET_EXREGS, offsetof() method is used for C header file,
   still hardcoded definition for assemble language.

Changes in v7:
1. Refine code to add LoongArch support in test case
set_memory_region_test.

Changes in v6:
1. Refresh the patch based on latest kernel 6.8-rc1, add LoongArch
support about testcase set_memory_region_test.
2. Add hardware_disable_test test case.
3. Drop modification about macro DEFAULT_GUEST_TEST_MEM, it is problem
of LoongArch binutils, this issue is raised to LoongArch binutils owners.

Changes in v5:
1. In LoongArch kvm self tests, the DEFAULT_GUEST_TEST_MEM could be
0x130000000, it is different from the default value in memstress.h.
So we Move the definition of DEFAULT_GUEST_TEST_MEM into LoongArch
ucall.h, and add 'ifndef' condition for DEFAULT_GUEST_TEST_MEM
in memstress.h.

Changes in v4:
1. Remove the based-on flag, as the LoongArch KVM patch series
have been accepted by Linux kernel, so this can be applied directly
in kernel.

Changes in v3:
1. Improve implementation of LoongArch VM page walk.
2. Add exception handler for LoongArch.
3. Add dirty_log_test, dirty_log_perf_test, guest_print_test
test cases for LoongArch.
4. Add __ASSEMBLER__ macro to distinguish asm file and c file.
5. Move ucall_arch_do_ucall to the header file and make it as
static inline to avoid function calls.
6. Change the DEFAULT_GUEST_TEST_MEM base addr for LoongArch.

Changes in v2:
1. We should use ".balign 4096" to align the assemble code with 4K in
exception.S instead of "align 12".
2. LoongArch only supports 3 or 4 levels page tables, so we remove the
hanlders for 2-levels page table.
3. Remove the DEFAULT_LOONGARCH_GUEST_STACK_VADDR_MIN and use the common
DEFAULT_GUEST_STACK_VADDR_MIN to allocate stack memory in guest.
4. Reorganize the test cases supported by LoongArch.
5. Fix some code comments.
6. Add kvm_binary_stats_test test case into LoongArch KVM selftests.

---
Bibo Mao (4):
  KVM: selftests: Add KVM selftests header files for LoongArch
  KVM: selftests: Add core KVM selftests support for LoongArch
  KVM: selftests: Add ucall test support for LoongArch
  KVM: selftests: Add test cases for LoongArch

 tools/testing/selftests/kvm/Makefile          |   2 +-
 tools/testing/selftests/kvm/Makefile.kvm      |  18 +
 .../testing/selftests/kvm/include/kvm_util.h  |   5 +
 .../kvm/include/loongarch/kvm_util_arch.h     |   7 +
 .../kvm/include/loongarch/processor.h         | 138 +++++++
 .../selftests/kvm/include/loongarch/ucall.h   |  20 +
 .../selftests/kvm/lib/loongarch/exception.S   |  59 +++
 .../selftests/kvm/lib/loongarch/processor.c   | 349 ++++++++++++++++++
 .../selftests/kvm/lib/loongarch/ucall.c       |  38 ++
 .../selftests/kvm/set_memory_region_test.c    |   2 +-
 10 files changed, 636 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/include/loongarch/kvm_util_arch.h
 create mode 100644 tools/testing/selftests/kvm/include/loongarch/processor.h
 create mode 100644 tools/testing/selftests/kvm/include/loongarch/ucall.h
 create mode 100644 tools/testing/selftests/kvm/lib/loongarch/exception.S
 create mode 100644 tools/testing/selftests/kvm/lib/loongarch/processor.c
 create mode 100644 tools/testing/selftests/kvm/lib/loongarch/ucall.c


base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8