Re: [PATCH v4 00/16] KVM: selftests: "tree" wide overhauls

Sean Christopherson
2024-12-18T21:57:38Z

On Wed, 27 Nov 2024 16:55:31 -0800, Sean Christopherson wrote:
> Two separate series (mmu_stress_test[1] and $ARCH[2]), posted as one to
> avoid unpleasant conflicts, and because I hope to land both in kvm/next
> shortly after 6.12-rc1 since they impact all of KVM selftests.
>
> mmu_stress_test
> ---------------
> Convert the max_guest_memory_test into a more generic mmu_stress_test.
> The basic gist of the "conversion" is to have the test do mprotect() on
> guest memory while vCPUs are accessing said memory, e.g. to verify KVM
> and mmu_notifiers are working as intended.
>
> [...]

As I am running out of time before I disappear for two weeks, applied to:

https://github.com/kvm-x86/linux.git selftests_arch

Other KVM maintainers, that branch is officially immutable. I also pushed a tag,
kvm-selftests-arch-6.14, just in case I pull a stupid and manage to clobber the
branch. My apologies if this causes pain. AFAICT, there aren't any queued or
in-flight patches that git's rename magic can't automatically handle, so hopefully
this ends up being pain-free.

Paolo, here's a pull request if you want to pull this into kvm/next long before
the 6.14 merge window. Diff stats at the very bottom (hilariously long).

---
The following changes since commit 3522c419758ee8dca5a0e8753ee0070a22157bc1:

Merge tag 'kvm-riscv-fixes-6.13-1' of https://github.com/kvm-riscv/linux into HEAD (2024-12-13 13:59:20 -0500)

are available in the Git repository at:

https://github.com/kvm-x86/linux.git tags/kvm-selftests-arch-6.14

for you to fetch changes up to d76fe926b6c443f912bbb14bbcd42a8b9e5d68f6:

KVM: selftests: Override ARCH for x86_64 instead of using ARCH_DIR (2024-12-17 08:49:49 -0800)

----------------------------------------------------------------
KVM selftests "tree"-wide changes for 6.14:

- Rework vcpu_get_reg() to return a value instead of using an out-param, and
update all affected arch code accordingly.

- Convert the max_guest_memory_test into a more generic mmu_stress_test.
The basic gist of the "conversion" is to have the test do mprotect() on
guest memory while vCPUs are accessing said memory, e.g. to verify KVM
and mmu_notifiers are working as intended.

- Play nice with treewrite builds of unsupported architectures, e.g. arm
(32-bit), as KVM selftests' Makefile doesn't do anything to ensure the
target architecture is actually one KVM selftests supports.

- Use the kernel's $(ARCH) definition instead of the target triple for arch
specific directories, e.g. arm64 instead of aarch64, mainly so as not to
be different from the rest of the kernel.

----------------------------------------------------------------
Sean Christopherson (16):
KVM: Move KVM_REG_SIZE() definition to common uAPI header
KVM: selftests: Return a value from vcpu_get_reg() instead of using an out-param
KVM: selftests: Assert that vcpu_{g,s}et_reg() won't truncate
KVM: selftests: Check for a potential unhandled exception iff KVM_RUN succeeded
KVM: selftests: Rename max_guest_memory_test to mmu_stress_test
KVM: selftests: Only muck with SREGS on x86 in mmu_stress_test
KVM: selftests: Compute number of extra pages needed in mmu_stress_test
KVM: sefltests: Explicitly include ucall_common.h in mmu_stress_test.c
KVM: selftests: Enable mmu_stress_test on arm64
KVM: selftests: Use vcpu_arch_put_guest() in mmu_stress_test
KVM: selftests: Precisely limit the number of guest loops in mmu_stress_test
KVM: selftests: Add a read-only mprotect() phase to mmu_stress_test
KVM: selftests: Verify KVM correctly handles mprotect(PROT_READ)
KVM: selftests: Provide empty 'all' and 'clean' targets for unsupported ARCHs
KVM: selftests: Use canonical $(ARCH) paths for KVM selftests directories
KVM: selftests: Override ARCH for x86_64 instead of using ARCH_DIR
---

[01/16] KVM: Move KVM_REG_SIZE() definition to common uAPI header
https://github.com/kvm-x86/linux/commit/915d2f0718a4
[02/16] KVM: selftests: Return a value from vcpu_get_reg() instead of using an out-param
https://github.com/kvm-x86/linux/commit/411e22037f8c
[03/16] KVM: selftests: Assert that vcpu_{g,s}et_reg() won't truncate
https://github.com/kvm-x86/linux/commit/446d7f483be3
[04/16] KVM: selftests: Check for a potential unhandled exception iff KVM_RUN succeeded
https://github.com/kvm-x86/linux/commit/f3c4e02e4da2
[05/16] KVM: selftests: Rename max_guest_memory_test to mmu_stress_test
https://github.com/kvm-x86/linux/commit/356ebe558f55
[06/16] KVM: selftests: Only muck with SREGS on x86 in mmu_stress_test
https://github.com/kvm-x86/linux/commit/66d612d32fe3
[07/16] KVM: selftests: Compute number of extra pages needed in mmu_stress_test
https://github.com/kvm-x86/linux/commit/f1e0b743b12e
[08/16] KVM: sefltests: Explicitly include ucall_common.h in mmu_stress_test.c
https://github.com/kvm-x86/linux/commit/0ce51ad9d565
[09/16] KVM: selftests: Enable mmu_stress_test on arm64
https://github.com/kvm-x86/linux/commit/d2fa5a3b80c6
[10/16] KVM: selftests: Use vcpu_arch_put_guest() in mmu_stress_test
https://github.com/kvm-x86/linux/commit/c1797c2be44d
[11/16] KVM: selftests: Precisely limit the number of guest loops in mmu_stress_test
https://github.com/kvm-x86/linux/commit/9615ab61eb54
[12/16] KVM: selftests: Add a read-only mprotect() phase to mmu_stress_test
https://github.com/kvm-x86/linux/commit/d9a3b8ab6643
[13/16] KVM: selftests: Verify KVM correctly handles mprotect(PROT_READ)
https://github.com/kvm-x86/linux/commit/a606855e27b3
[14/16] KVM: selftests: Provide empty 'all' and 'clean' targets for unsupported ARCHs
https://github.com/kvm-x86/linux/commit/1f13ec4de22d
[15/16] KVM: selftests: Use canonical $(ARCH) paths for KVM selftests directories
https://github.com/kvm-x86/linux/commit/022d78205681
[16/16] KVM: selftests: Override ARCH for x86_64 instead of using ARCH_DIR
https://github.com/kvm-x86/linux/commit/d76fe926b6c4

--
https://github.com/kvm-x86/linux/tree/next

MAINTAINERS | 12 +--
arch/arm64/include/uapi/asm/kvm.h | 3 -
arch/riscv/include/uapi/asm/kvm.h | 3 -
include/uapi/linux/kvm.h | 4 +
tools/testing/selftests/kvm/.gitignore | 1 +
tools/testing/selftests/kvm/Makefile | 345 ++------------------------------------------------------------------------------
tools/testing/selftests/kvm/Makefile.kvm | 330 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/kvm/{aarch64 => arm64}/aarch32_id_regs.c | 10 +--
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tools/testing/selftests/kvm/{x86_64 => x86}/svm_int_ctl_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/svm_nested_shutdown_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/svm_nested_soft_inject_test.c | 0
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tools/testing/selftests/kvm/{x86_64 => x86}/triple_fault_event_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/tsc_msrs_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/tsc_scaling_sync.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/ucna_injection_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/userspace_io_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/userspace_msr_exit_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_apic_access_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_close_while_nested_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_dirty_log_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_exception_with_invalid_guest_state.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_invalid_nested_guest_state.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_msrs_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_nested_tsc_scaling_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_pmu_caps_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_preemption_timer_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_set_nested_state_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/vmx_tsc_adjust_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/xapic_ipi_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/xapic_state_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/xcr0_cpuid_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/xen_shinfo_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/xen_vmcall_test.c | 0
tools/testing/selftests/kvm/{x86_64 => x86}/xss_msr_test.c | 0
164 files changed, 584 insertions(+), 477 deletions(-)
create mode 100644 tools/testing/selftests/kvm/Makefile.kvm
rename tools/testing/selftests/kvm/{aarch64 => arm64}/aarch32_id_regs.c (95%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/arch_timer.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/arch_timer_edge_cases.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/debug-exceptions.c (99%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/get-reg-list.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/hypercalls.c (98%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/mmio_abort.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/no-vgic-v3.c (98%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/page_fault_test.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/psci_test.c (97%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/set_id_regs.c (97%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/smccc_filter.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/vcpu_width_config.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/vgic_init.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/vgic_irq.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/vgic_lpi_stress.c (100%)
rename tools/testing/selftests/kvm/{aarch64 => arm64}/vpmu_counter_access.c (97%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/arch_timer.h (100%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/delay.h (100%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/gic.h (100%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/gic_v3.h (100%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/gic_v3_its.h (100%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/kvm_util_arch.h (100%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/processor.h (100%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/spinlock.h (100%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/ucall.h (100%)
rename tools/testing/selftests/kvm/include/{aarch64 => arm64}/vgic.h (100%)
rename tools/testing/selftests/kvm/include/{s390x => s390}/debug_print.h (100%)
rename tools/testing/selftests/kvm/include/{s390x => s390}/diag318_test_handler.h (100%)
rename tools/testing/selftests/kvm/include/{s390x => s390}/facility.h (100%)
rename tools/testing/selftests/kvm/include/{s390x => s390}/kvm_util_arch.h (100%)
rename tools/testing/selftests/kvm/include/{s390x => s390}/processor.h (100%)
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