[v5,0/4] KVM: selftests: Add LoongArch support

  We add LoongArch support into KVM selftests and there are some KVM
test cases we have passed:
	demand_paging_test
	dirty_log_perf_test
	dirty_log_test
	guest_print_test
	kvm_binary_stats_test
	kvm_create_max_vcpus
	kvm_page_table_test
	memslot_modification_stress_test
	memslot_perf_test
	set_memory_region_test

Changes for 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 for 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 for 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 for 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.

changes for v1:
1. Add kvm selftests header files for LoongArch.
2. Add processor tests for LoongArch KVM.
3. Add ucall tests for LoongArch KVM.
4. Add LoongArch tests into makefile.

All of the test cases results:
1..10
 timeout set to 120
 selftests: kvm: demand_paging_test
 Testing guest mode: PA-bits:36,  VA-bits:47, 16K pages
 guest physical test memory: [0xfbfffc000, 0xfffffc000)
 Finished creating vCPUs and starting uffd threads
 Started all vCPUs
 All vCPU threads joined
 Total guest execution time: 0.200804700s
 Overall demand paging rate: 326366.862927 pgs/sec
ok 1 selftests: kvm: demand_paging_test
 timeout set to 120
 selftests: kvm: dirty_log_perf_test
 Test iterations: 2
 Testing guest mode: PA-bits:36,  VA-bits:47, 16K pages
 guest physical test memory: [0xfbfffc000, 0xfffffc000)
 Random seed: 1
 Populate memory time: 0.201452560s
 Enabling dirty logging time: 0.000451670s
 
 Iteration 1 dirty memory time: 0.051582140s
 Iteration 1 get dirty log time: 0.000010510s
 Iteration 1 clear dirty log time: 0.000421730s
 Iteration 2 dirty memory time: 0.046593760s
 Iteration 2 get dirty log time: 0.000002110s
 Iteration 2 clear dirty log time: 0.000418020s
 Disabling dirty logging time: 0.002948490s
 Get dirty log over 2 iterations took 0.000012620s. (Avg 0.000006310s/iteration)
 Clear dirty log over 2 iterations took 0.000839750s. (Avg 0.000419875s/iteration)
ok 2 selftests: kvm: dirty_log_perf_test
 timeout set to 120
 selftests: kvm: dirty_log_test
 Test iterations: 32, interval: 10 (ms)
 Testing Log Mode 'dirty-log'
 Testing guest mode: PA-bits:36,  VA-bits:47, 16K pages
 guest physical test memory offset: 0xfbfff0000
 Dirtied 453632 pages
 Total bits checked: dirty (436564), clear (1595145), track_next (70002)
 Testing Log Mode 'clear-log'
 Testing guest mode: PA-bits:36,  VA-bits:47, 16K pages
 guest physical test memory offset: 0xfbfff0000
 Dirtied 425984 pages
 Total bits checked: dirty (414397), clear (1617312), track_next (68152)
 Testing Log Mode 'dirty-ring'
 Testing guest mode: PA-bits:36,  VA-bits:47, 16K pages
 dirty ring count: 0x10000
 guest physical test memory offset: 0xfbfff0000
 vcpu stops because vcpu is kicked out...
 Notifying vcpu to continue
 vcpu continues now.
 Iteration 1 collected 3201 pages
 vcpu stops because dirty ring is full...
 vcpu continues now.
 vcpu stops because dirty ring is full...
 Notifying vcpu to continue
 Iteration 2 collected 65472 pages
 ......
 vcpu continues now.
 vcpu stops because vcpu is kicked out...
 vcpu continues now.
 vcpu stops because vcpu is kicked out...
 Notifying vcpu to continue
 vcpu continues now.
 Iteration 31 collected 12642 pages
 vcpu stops because dirty ring is full...
 vcpu continues now.
 Dirtied 7275520 pages
 Total bits checked: dirty (1165675), clear (866034), track_next (811358)
ok 3 selftests: kvm: dirty_log_test
 timeout set to 120
 selftests: kvm: guest_print_test
ok 4 selftests: kvm: guest_print_test
 timeout set to 120
 selftests: kvm: kvm_binary_stats_test
 TAP version 13
 1..4
 ok 1 vm0
 ok 2 vm1
 ok 3 vm2
 ok 4 vm3
 # Totals: pass:4 fail:0 xfail:0 xpass:0 skip:0 error:0
ok 5 selftests: kvm: kvm_binary_stats_test
 timeout set to 120
 selftests: kvm: kvm_create_max_vcpus
 KVM_CAP_MAX_VCPU_ID: 256
 KVM_CAP_MAX_VCPUS: 256
 Testing creating 256 vCPUs, with IDs 0...255.
ok 6 selftests: kvm: kvm_create_max_vcpus
 timeout set to 120
 selftests: kvm: kvm_page_table_test
 Testing guest mode: PA-bits:36,  VA-bits:47, 16K pages
 Testing memory backing src type: anonymous
 Testing memory backing src granularity: 0x4000
 Testing memory size(aligned): 0x40000000
 Guest physical test memory offset: 0xfbfffc000
 Host  virtual  test memory offset: 0x7fffb0860000
 Number of testing vCPUs: 1
 Started all vCPUs successfully
 KVM_CREATE_MAPPINGS: total execution time: 0.200919330s
 
 KVM_UPDATE_MAPPINGS: total execution time: 0.051182930s
 
 KVM_ADJUST_MAPPINGS: total execution time: 0.010083590s
 
ok 7 selftests: kvm: kvm_page_table_test
 timeout set to 120
 selftests: kvm: memslot_modification_stress_test
 Testing guest mode: PA-bits:36,  VA-bits:47, 16K pages
 guest physical test memory: [0xfbfffc000, 0xfffffc000)
 Finished creating vCPUs
 Started all vCPUs
 All vCPU threads joined
ok 8 selftests: kvm: memslot_modification_stress_test
 timeout set to 120
 selftests: kvm: memslot_perf_test
 Testing map performance with 1 runs, 5 seconds each
 Memslot count too high for this test, decrease the cap (max is 2053)
 
 Testing unmap performance with 1 runs, 5 seconds each
 Memslot count too high for this test, decrease the cap (max is 8197)
 
 Testing unmap chunked performance with 1 runs, 5 seconds each
 Memslot count too high for this test, decrease the cap (max is 8197)
 
 Testing move active area performance with 1 runs, 5 seconds each
 Test took 0.761678900s for slot setup + 5.000014460s all iterations
 Done 120167 iterations, avg 0.000041608s each
 Best runtime result was 0.000041608s per iteration (with 120167 iterations)
 
 Testing move inactive area performance with 1 runs, 5 seconds each
 Test took 0.771796550s for slot setup + 5.000018520s all iterations
 Done 136354 iterations, avg 0.000036669s each
 Best runtime result was 0.000036669s per iteration (with 136354 iterations)
 
 Testing RW performance with 1 runs, 5 seconds each
 Test took 0.763568840s for slot setup + 5.002233800s all iterations
 Done 649 iterations, avg 0.007707602s each
 Best runtime result was 0.007707602s per iteration (with 649 iterations)
 Best slot setup time for the whole test area was 0.761678900s
ok 9 selftests: kvm: memslot_perf_test
 timeout set to 120
 selftests: kvm: set_memory_region_test
 Allowed number of memory slots: 32767
 Adding slots 0..32766, each memory region with 2048K size
ok 10 selftests: kvm: set_memory_region_test

Tianrui Zhao (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          |  15 +
 .../selftests/kvm/include/kvm_util_base.h     |   5 +
 .../kvm/include/loongarch/processor.h         | 133 +++++++
 .../selftests/kvm/include/loongarch/ucall.h   |  28 ++
 .../testing/selftests/kvm/include/memstress.h |   2 +
 .../selftests/kvm/lib/loongarch/exception.S   |  59 ++++
 .../selftests/kvm/lib/loongarch/processor.c   | 333 ++++++++++++++++++
 .../selftests/kvm/lib/loongarch/ucall.c       |  38 ++
 8 files changed, 613 insertions(+)
 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