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Date:   Tue, 7 Jun 2022 20:27:21 +0000
From:   Sean Christopherson <seanjc@google.com>
To:     Paolo Bonzini <pbonzini@redhat.com>
Cc:     kvm@vger.kernel.org, Vitaly Kuznetsov <vkuznets@redhat.com>,
        Andrew Jones <drjones@redhat.com>,
        David Matlack <dmatlack@google.com>,
        Ben Gardon <bgardon@google.com>,
        Oliver Upton <oupton@google.com>, linux-kernel@vger.kernel.org,
        Marc Zyngier <Marc.Zyngier@arm.com>,
        "anup@brainfault.org" <anup@brainfault.org>,
        Raghavendra Rao Ananta <rananta@google.com>
Subject: Re: [PATCH v2 000/144] KVM: selftests: Overhaul APIs, purge VCPU_ID
Message-ID: <Yp+0qQqpokj7RSKL@google.com>
References: <20220603004331.1523888-1-seanjc@google.com>
 <21570ac1-e684-7983-be00-ba8b3f43a9ee@redhat.com>
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+Raghu

On Tue, Jun 07, 2022, Paolo Bonzini wrote:
> Marc, Christian, Anup, can you please give this a go?

Raghu is going to run on arm64, I'll work with him to iron out any bugs (I should
have done this before posting).  I.e. Marc is mostly off the hook unless there's
tests we can't run.


> 
> Paolo
> 
> On 6/3/22 02:41, Sean Christopherson wrote:
> > 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
>