Message-Id: <20220603004331.1523888-1-seanjc@google.com>
Date:   Fri,  3 Jun 2022 00:41:07 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, Vitaly Kuznetsov <vkuznets@...hat.com>,
        Andrew Jones <drjones@...hat.com>,
        David Matlack <dmatlack@...gle.com>,
        Ben Gardon <bgardon@...gle.com>,
        Oliver Upton <oupton@...gle.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 000/144] KVM: selftests: Overhaul APIs, purge VCPU_ID

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@google.com

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

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