[PATCH v2 000/144] KVM: selftests: Overhaul APIs, purge VCPU_ID

From: Sean Christopherson
Date: Thu Jun 02 2022 - 20:43:46 EST

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Overhaul KVM's selftest APIs to get selftests to a state where adding new
features and writing tests is less painful/disgusting.

Patches 1 fixes a goof in kvm/queue and should be squashed.

I would really, really, really like to get this queued up sooner than
later, or maybe just thrown into a separate selftests-specific branch that
folks can develop against. Rebasing is tedious, frustrating, and time
consuming. And spoiler alert, there's another 42 x86-centric patches
inbound that builds on this series to clean up CPUID related crud...

The primary theme is to stop treating tests like second class citizens.
Stop hiding vcpu, kvm_vm, etc... There's no sensitive data/constructs, and
the encapsulation has led to really, really bad and difficult to maintain
code. E.g. having to pass around the VM just to call a vCPU ioctl(),
arbitrary non-zero vCPU IDs, tests having to care about the vCPU ID in the
first place, etc...

The other theme in the rework is to deduplicate code and try to set us
up for success in the future. E.g. provide macros/helpers instead of
spamming CTRL-C => CTRL-V (see the -1k LoC), structure the VM creation
APIs to build on one another, etc...

The absurd patch count (as opposed to just ridiculous) is due to converting
each test away from using hardcoded vCPU IDs in a separate patch. The vast
majority of those patches probably aren't worth reviewing in depth, the
changes are mostly mechanical in nature.

However, _running_ non-x86 tests (or tests that have unique non-x86
behavior) would be extremely valuable. All patches have been compile tested
on x86, arm, risc-v, and s390, but I've only run the tests on x86. Based on
my track record for the x86+common tests, I will be very, very surprised if
I didn't break any of the non-x86 tests, e.g. pthread_create()'s 'void *'
param tripped me up multiple times.

I have not run x86's amx_test due to lack of hardware. I also haven't run
sev_migration; something is wonky in either the upstream support for INIT_EX
or in our test machines and I can't get SEV to initialize.

v2:
- Drop the forced -Werror patch. [Vitaly]
- Add TEST_REQUIRE to reduce KSFT_SKIP boilerplate.
- Rebase to kvm/queue, commit 55371f1d0c01.
- Clean up even more bad copy+paste code (x86 was hiding a lot of crud).
- Assert that the input to an ioctl() is (likely) the correct struct.

v1: https://lore.kernel.org/all/20220504224914.1654036-1-seanjc@xxxxxxxxxx

Sean Christopherson (144):
KVM: Fix references to non-existent KVM_CAP_TRIPLE_FAULT_EVENT
KVM: selftests: Fix buggy-but-benign check in
test_v3_new_redist_regions()
KVM: selftests: Fix typo in vgic_init test
KVM: selftests: Drop stale declarations from kvm_util_base.h
KVM: selftests: Always open VM file descriptors with O_RDWR
KVM: selftests: Add another underscore to inner ioctl() helpers
KVM: selftests: Make vcpu_ioctl() a wrapper to pretty print ioctl name
KVM: selftests: Drop @mode from common vm_create() helper
KVM: selftests: Split vcpu_set_nested_state() into two helpers
KVM: sefltests: Use vcpu_ioctl() and __vcpu_ioctl() helpers
KVM: selftests: Add __vcpu_run() helper
KVM: selftests: Use vcpu_access_device_attr() in arm64 code
KVM: selftests: Remove vcpu_get_fd()
KVM: selftests: Add vcpu_get() to retrieve and assert on vCPU
existence
KVM: selftests: Make vm_ioctl() a wrapper to pretty print ioctl name
KVM: sefltests: Use vm_ioctl() and __vm_ioctl() helpers
KVM: selftests: Make kvm_ioctl() a wrapper to pretty print ioctl name
KVM: selftests: Use kvm_ioctl() helpers
KVM: selftests: Use __KVM_SYSCALL_ERROR() to handle non-KVM syscall
errors
KVM: selftests: Make x86-64's register dump helpers static
KVM: selftests: Get rid of kvm_util_internal.h
KVM: selftests: Use KVM_IOCTL_ERROR() for one-off arm64 ioctls
KVM: selftests: Drop @test param from kvm_create_device()
KVM: selftests: Move KVM_CREATE_DEVICE_TEST code to separate helper
KVM: selftests: Multiplex return code and fd in __kvm_create_device()
KVM: selftests: Rename KVM_HAS_DEVICE_ATTR helpers for consistency
KVM: selftests: Drop 'int' return from asserting *_has_device_attr()
KVM: selftests: Split get/set device_attr helpers
KVM: selftests: Add a VM backpointer to 'struct vcpu'
KVM: selftests: Consolidate KVM_ENABLE_CAP usage
KVM: selftests: Simplify KVM_ENABLE_CAP helper APIs
KVM: selftests: Cache list of MSRs to save/restore
KVM: selftests: Harden and comment XSS / KVM_SET_MSRS interaction
KVM: selftests: Dedup MSR index list helpers, simplify dedicated test
KVM: selftests: Rename MP_STATE and GUEST_DEBUG helpers for
consistency
KVM: selftest: Add proper helpers for x86-specific save/restore ioctls
KVM: selftests: Add vm_create_*() variants to expose/return 'struct
vcpu'
KVM: selftests: Push vm_adjust_num_guest_pages() into "w/o vCPUs"
helper
KVM: selftests: Use vm_create_without_vcpus() in set_boot_cpu_id
KVM: selftests: Use vm_create_without_vcpus() in dirty_log_test
KVM: selftests: Use vm_create_without_vcpus() in hardware_disable_test
KVM: selftests: Use vm_create_without_vcpus() in psci_test
KVM: selftests: Rename vm_create() => vm_create_barebones(), drop
param
KVM: selftests: Rename vm_create_without_vcpus() => vm_create()
KVM: selftests: Make vm_create() a wrapper that specifies
VM_MODE_DEFAULT
KVM: selftests: Rename xAPIC state test's vcpu struct
KVM: selftests: Rename vcpu.state => vcpu.run
KVM: selftests: Rename 'struct vcpu' to 'struct kvm_vcpu'
KVM: selftests: Return the created vCPU from vm_vcpu_add()
KVM: selftests: Convert memslot_perf_test away from VCPU_ID
KVM: selftests: Convert rseq_test away from VCPU_ID
KVM: selftests: Convert xss_msr_test away from VCPU_ID
KVM: selftests: Convert vmx_preemption_timer_test away from VCPU_ID
KVM: selftests: Convert vmx_pmu_msrs_test away from VCPU_ID
KVM: selftests: Convert vmx_set_nested_state_test away from VCPU_ID
KVM: selftests: Convert vmx_tsc_adjust_test away from VCPU_ID
KVM: selftests: Convert mmu_role_test away from VCPU_ID
KVM: selftests: Convert pmu_event_filter_test away from VCPU_ID
KVM: selftests: Convert smm_test away from VCPU_ID
KVM: selftests: Convert state_test away from VCPU_ID
KVM: selftests: Convert svm_int_ctl_test away from VCPU_ID
KVM: selftests: Convert svm_vmcall_test away from VCPU_ID
KVM: selftests: Convert sync_regs_test away from VCPU_ID
KVM: selftests: Convert hyperv_cpuid away from VCPU_ID
KVM: selftests: Convert kvm_pv_test away from VCPU_ID
KVM: selftests: Convert platform_info_test away from VCPU_ID
KVM: selftests: Convert vmx_nested_tsc_scaling_test away from VCPU_ID
KVM: selftests: Convert set_sregs_test away from VCPU_ID
KVM: selftests: Convert vmx_dirty_log_test away from VCPU_ID
KVM: selftests: Convert vmx_close_while_nested_test away from VCPU_ID
KVM: selftests: Convert vmx_apic_access_test away from VCPU_ID
KVM: selftests: Convert userspace_msr_exit_test away from VCPU_ID
KVM: selftests: Convert vmx_exception_with_invalid_guest_state away
from VCPU_ID
KVM: selftests: Convert tsc_msrs_test away from VCPU_ID
KVM: selftests: Convert kvm_clock_test away from VCPU_ID
KVM: selftests: Convert hyperv_svm_test away from VCPU_ID
KVM: selftests: Convert hyperv_features away from VCPU_ID
KVM: selftests: Convert hyperv_clock away from VCPU_ID
KVM: selftests: Convert evmcs_test away from VCPU_ID
KVM: selftests: Convert emulator_error_test away from VCPU_ID
KVM: selftests: Convert debug_regs away from VCPU_ID
KVM: selftests: Add proper helper for advancing RIP in debug_regs
KVM: selftests: Convert amx_test away from VCPU_ID
KVM: selftests: Convert cr4_cpuid_sync_test away from VCPU_ID
KVM: selftests: Convert cpuid_test away from VCPU_ID
KVM: selftests: Convert userspace_io_test away from VCPU_ID
KVM: selftests: Convert vmx_invalid_nested_guest_state away from
VCPU_ID
KVM: selftests: Convert xen_vmcall_test away from VCPU_ID
KVM: selftests: Convert xen_shinfo_test away from VCPU_ID
KVM: selftests: Convert dirty_log_test away from VCPU_ID
KVM: selftests: Convert set_memory_region_test away from VCPU_ID
KVM: selftests: Convert system_counter_offset_test away from VCPU_ID
KVM: selftests: Track kvm_vcpu object in tsc_scaling_sync
KVM: selftests: Convert xapic_state_test away from hardcoded vCPU ID
KVM: selftests: Convert debug-exceptions away from VCPU_ID
KVM: selftests: Convert fix_hypercall_test away from VCPU_ID
KVM: selftests: Convert vgic_irq away from VCPU_ID
KVM: selftests: Make arm64's guest_get_vcpuid() declaration arm64-only
KVM: selftests: Move vm_is_unrestricted_guest() to x86-64
KVM: selftests: Add "arch" to common utils that have arch
implementations
KVM: selftests: Return created vcpu from vm_vcpu_add_default()
KVM: selftests: Rename vm_vcpu_add* helpers to better show
relationships
KVM: selftests: Convert set_boot_cpu_id away from global VCPU_IDs
KVM: selftests: Convert psci_test away from VCPU_ID
KVM: selftests: Convert hardware_disable_test to pass around vCPU
objects
KVM: selftests: Add VM creation helper that "returns" vCPUs
KVM: selftests: Convert steal_time away from VCPU_ID
KVM: selftests: Convert arch_timer away from VCPU_ID
KVM: selftests: Convert svm_nested_soft_inject_test away from VCPU_ID
KVM: selftests: Convert triple_fault_event_test away from VCPU_ID
KVM: selftests: Convert vgic_init away from
vm_create_default_with_vcpus()
KVM: selftests: Consolidate KVM_{G,S}ET_ONE_REG helpers
KVM: selftests: Sync stage before VM is freed in hypercalls test
KVM: selftests: Convert hypercalls test away from vm_create_default()
KVM: selftests: Convert xapic_ipi_test away from *_VCPU_ID
KVM: selftests: Convert sync_regs_test away from VCPU_ID
KVM: selftests: Convert s390's "resets" test away from VCPU_ID
KVM: selftests: Convert memop away from VCPU_ID
KVM: selftests: Convert s390x/diag318_test_handler away from VCPU_ID
KVM: selftests: Convert tprot away from VCPU_ID
KVM: selftests: Use vm_create() in tsc_scaling_sync
KVM: selftests: Use vm_create_with_vcpus() in max_guest_memory_test
KVM: selftests: Drop vm_create_default* helpers
KVM: selftests: Drop @vcpuids param from VM creators
KVM: selftests: Convert kvm_page_table_test away from reliance on
vcpu_id
KVM: selftests: Convert kvm_binary_stats_test away from vCPU IDs
KVM: selftests: Convert get-reg-list away from its "VCPU_ID"
KVM: selftests: Stop hardcoding vCPU IDs in vcpu_width_config
KVM: selftests: Stop conflating vCPU index and ID in perf tests
KVM: selftests: Remove vcpu_get() usage from dirty_log_test
KVM: selftests: Require vCPU output array when creating VM with vCPUs
KVM: selftests: Purge vm+vcpu_id == vcpu silliness
KVM: selftests: Drop vcpu_get(), rename vcpu_find() => vcpu_exists()
KVM: selftests: Remove vcpu_state() helper
KVM: selftests: Open code and drop 'struct kvm_vm' accessors
KVM: selftests: Drop @slot0_mem_pages from __vm_create_with_vcpus()
KVM: selftests: Drop @num_percpu_pages from __vm_create_with_vcpus()
KVM: selftests: Move per-VM/per-vCPU nr pages calculation to
__vm_create()
KVM: selftests: Trust that MAXPHYADDR > memslot0 in
vmx_apic_access_test
KVM: selftests: Drop DEFAULT_GUEST_PHY_PAGES, open code the magic
number
KVM: selftests: Return an 'unsigned int' from kvm_check_cap()
KVM: selftests: Add kvm_has_cap() to provide syntactic sugar
KVM: selftests: Add TEST_REQUIRE macros to reduce skipping copy+paste
KVM: selftests: Sanity check input to ioctls() at build time

Documentation/virt/kvm/api.rst | 4 +-
.../selftests/kvm/aarch64/arch_timer.c | 79 +-
.../selftests/kvm/aarch64/debug-exceptions.c | 22 +-
.../selftests/kvm/aarch64/get-reg-list.c | 29 +-
.../selftests/kvm/aarch64/hypercalls.c | 90 +-
.../testing/selftests/kvm/aarch64/psci_test.c | 69 +-
.../selftests/kvm/aarch64/vcpu_width_config.c | 71 +-
.../testing/selftests/kvm/aarch64/vgic_init.c | 379 +++---
.../testing/selftests/kvm/aarch64/vgic_irq.c | 40 +-
.../selftests/kvm/access_tracking_perf_test.c | 92 +-
.../selftests/kvm/demand_paging_test.c | 49 +-
.../selftests/kvm/dirty_log_perf_test.c | 51 +-
tools/testing/selftests/kvm/dirty_log_test.c | 95 +-
.../selftests/kvm/hardware_disable_test.c | 29 +-
.../selftests/kvm/include/aarch64/processor.h | 28 +-
.../selftests/kvm/include/aarch64/vgic.h | 6 +-
.../selftests/kvm/include/kvm_util_base.h | 743 ++++++++---
.../selftests/kvm/include/perf_test_util.h | 5 +-
.../selftests/kvm/include/riscv/processor.h | 20 -
.../testing/selftests/kvm/include/test_util.h | 9 +
.../selftests/kvm/include/ucall_common.h | 2 +-
.../selftests/kvm/include/x86_64/evmcs.h | 2 +-
.../selftests/kvm/include/x86_64/processor.h | 109 +-
.../selftests/kvm/kvm_binary_stats_test.c | 31 +-
.../selftests/kvm/kvm_create_max_vcpus.c | 10 +-
.../selftests/kvm/kvm_page_table_test.c | 66 +-
.../selftests/kvm/lib/aarch64/processor.c | 81 +-
.../testing/selftests/kvm/lib/aarch64/ucall.c | 9 +-
.../testing/selftests/kvm/lib/aarch64/vgic.c | 54 +-
tools/testing/selftests/kvm/lib/elf.c | 1 -
tools/testing/selftests/kvm/lib/guest_modes.c | 6 +-
tools/testing/selftests/kvm/lib/kvm_util.c | 1104 +++--------------
.../selftests/kvm/lib/kvm_util_internal.h | 128 --
.../selftests/kvm/lib/perf_test_util.c | 84 +-
.../selftests/kvm/lib/riscv/processor.c | 111 +-
tools/testing/selftests/kvm/lib/riscv/ucall.c | 14 +-
.../kvm/lib/s390x/diag318_test_handler.c | 11 +-
.../selftests/kvm/lib/s390x/processor.c | 44 +-
tools/testing/selftests/kvm/lib/s390x/ucall.c | 8 +-
.../selftests/kvm/lib/x86_64/processor.c | 533 +++-----
tools/testing/selftests/kvm/lib/x86_64/svm.c | 6 +-
.../testing/selftests/kvm/lib/x86_64/ucall.c | 10 +-
tools/testing/selftests/kvm/lib/x86_64/vmx.c | 16 +-
.../selftests/kvm/max_guest_memory_test.c | 53 +-
.../kvm/memslot_modification_stress_test.c | 13 +-
.../testing/selftests/kvm/memslot_perf_test.c | 28 +-
tools/testing/selftests/kvm/rseq_test.c | 22 +-
tools/testing/selftests/kvm/s390x/memop.c | 93 +-
tools/testing/selftests/kvm/s390x/resets.c | 140 ++-
.../selftests/kvm/s390x/sync_regs_test.c | 45 +-
tools/testing/selftests/kvm/s390x/tprot.c | 25 +-
.../selftests/kvm/set_memory_region_test.c | 43 +-
tools/testing/selftests/kvm/steal_time.c | 120 +-
.../kvm/system_counter_offset_test.c | 35 +-
tools/testing/selftests/kvm/x86_64/amx_test.c | 56 +-
.../testing/selftests/kvm/x86_64/cpuid_test.c | 29 +-
.../kvm/x86_64/cr4_cpuid_sync_test.c | 22 +-
.../testing/selftests/kvm/x86_64/debug_regs.c | 77 +-
.../kvm/x86_64/emulator_error_test.c | 74 +-
.../testing/selftests/kvm/x86_64/evmcs_test.c | 61 +-
.../selftests/kvm/x86_64/fix_hypercall_test.c | 45 +-
.../kvm/x86_64/get_msr_index_features.c | 117 +-
.../selftests/kvm/x86_64/hyperv_clock.c | 25 +-
.../selftests/kvm/x86_64/hyperv_cpuid.c | 34 +-
.../selftests/kvm/x86_64/hyperv_features.c | 61 +-
.../selftests/kvm/x86_64/hyperv_svm_test.c | 20 +-
.../selftests/kvm/x86_64/kvm_clock_test.c | 29 +-
.../selftests/kvm/x86_64/kvm_pv_test.c | 33 +-
.../kvm/x86_64/max_vcpuid_cap_test.c | 28 +-
.../selftests/kvm/x86_64/mmio_warning_test.c | 16 +-
.../selftests/kvm/x86_64/mmu_role_test.c | 30 +-
.../selftests/kvm/x86_64/platform_info_test.c | 51 +-
.../kvm/x86_64/pmu_event_filter_test.c | 97 +-
.../selftests/kvm/x86_64/set_boot_cpu_id.c | 91 +-
.../selftests/kvm/x86_64/set_sregs_test.c | 47 +-
.../selftests/kvm/x86_64/sev_migrate_tests.c | 120 +-
tools/testing/selftests/kvm/x86_64/smm_test.c | 37 +-
.../testing/selftests/kvm/x86_64/state_test.c | 29 +-
.../selftests/kvm/x86_64/svm_int_ctl_test.c | 21 +-
.../kvm/x86_64/svm_nested_soft_inject_test.c | 17 +-
.../selftests/kvm/x86_64/svm_vmcall_test.c | 16 +-
.../selftests/kvm/x86_64/sync_regs_test.c | 62 +-
.../kvm/x86_64/triple_fault_event_test.c | 39 +-
.../selftests/kvm/x86_64/tsc_msrs_test.c | 35 +-
.../selftests/kvm/x86_64/tsc_scaling_sync.c | 25 +-
.../selftests/kvm/x86_64/userspace_io_test.c | 18 +-
.../kvm/x86_64/userspace_msr_exit_test.c | 187 ++-
.../kvm/x86_64/vmx_apic_access_test.c | 27 +-
.../kvm/x86_64/vmx_close_while_nested_test.c | 17 +-
.../selftests/kvm/x86_64/vmx_dirty_log_test.c | 13 +-
.../vmx_exception_with_invalid_guest_state.c | 68 +-
.../x86_64/vmx_invalid_nested_guest_state.c | 18 +-
.../kvm/x86_64/vmx_nested_tsc_scaling_test.c | 29 +-
.../selftests/kvm/x86_64/vmx_pmu_caps_test.c | 48 +-
.../kvm/x86_64/vmx_preemption_timer_test.c | 35 +-
.../kvm/x86_64/vmx_set_nested_state_test.c | 91 +-
.../kvm/x86_64/vmx_tsc_adjust_test.c | 13 +-
.../selftests/kvm/x86_64/xapic_ipi_test.c | 48 +-
.../selftests/kvm/x86_64/xapic_state_test.c | 60 +-
.../selftests/kvm/x86_64/xen_shinfo_test.c | 73 +-
.../selftests/kvm/x86_64/xen_vmcall_test.c | 25 +-
.../selftests/kvm/x86_64/xss_msr_test.c | 56 +-
102 files changed, 3059 insertions(+), 4178 deletions(-)
delete mode 100644 tools/testing/selftests/kvm/lib/kvm_util_internal.h

base-commit: 55371f1d0c01357f29da613f7525c3f252320bbf
--
2.36.1.255.ge46751e96f-goog

Next message: Sean Christopherson: "[PATCH v2 001/144] KVM: Fix references to non-existent KVM_CAP_TRIPLE_FAULT_EVENT"
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