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Date: Thu, 9 Jun 2022 11:35:23 +0530
From: Anup Patel <anup@...infault.org>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>,
KVM General <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 List" <linux-kernel@...r.kernel.org>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH v2 000/144] KVM: selftests: Overhaul APIs, purge VCPU_ID
On Wed, Jun 8, 2022 at 9:26 PM Anup Patel <anup@...infault.org> wrote:
>
> On Tue, Jun 7, 2022 at 8:57 PM Paolo Bonzini <pbonzini@...hat.com> wrote:
> >
> > Marc, Christian, Anup, can you please give this a go?
>
> Sure, I will try this series.
I tried to apply this series on top of kvm/next and kvm/queue but
I always get conflicts. It seems this series is dependent on other
in-flight patches.
Is there a branch somewhere in a public repo ?
Regards,
Anup
>
> Regards,
> Anup
>
> >
> > 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
> >
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