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

Sean Christopherson seanjc at google.com
Wed Dec 18 18:00:50 PST 2024


On Wed, Dec 18, 2024, Sean Christopherson wrote:
> On Wed, Dec 18, 2024, Sean Christopherson wrote:
> > 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).
> 
> Argh!  I completely forget to build test this on non-x86, and missed that arm64
> snuck in 75cd027cbcb1 ("KVM: arm64: selftests: Test ID_AA64PFR0.MPAM isn't completely 
> ignored").  *sigh*
> 
> Given that I just sent out mail, I'm going to cross my fingers and hope that no
> one has merged the above branch/tag.  I've deleted the branch and tags from the
> remote, but kept the tag locally just in case.
> 
> Please holler if you managed to grab the broken branch/tag.  If no one screams,
> I'll assume I got luckly and will push a fixed version (with different names) later
> today.

Third time is the charm.  Compile tested on all architectures, and runtime tested
on x86 and arm64.

  https://github.com/kvm-x86/linux.git selftests_treewide_6.14

---
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-treewide-6.14

for you to fetch changes up to 9af04539d474dda4984ff4909d4568e6123c8cba:

  KVM: selftests: Override ARCH for x86_64 instead of using ARCH_DIR (2024-12-18 14:15:05 -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/09bb926d2907
[03/16] KVM: selftests: Assert that vcpu_{g,s}et_reg() won't truncate
        https://github.com/kvm-x86/linux/commit/fe85ce31b289
[04/16] KVM: selftests: Check for a potential unhandled exception iff KVM_RUN succeeded
        https://github.com/kvm-x86/linux/commit/d6533c151338
[05/16] KVM: selftests: Rename max_guest_memory_test to mmu_stress_test
        https://github.com/kvm-x86/linux/commit/b12391498d1e
[06/16] KVM: selftests: Only muck with SREGS on x86 in mmu_stress_test
        https://github.com/kvm-x86/linux/commit/55e164df482a
[07/16] KVM: selftests: Compute number of extra pages needed in mmu_stress_test
        https://github.com/kvm-x86/linux/commit/1ddd3ea75ac3
[08/16] KVM: sefltests: Explicitly include ucall_common.h in mmu_stress_test.c
        https://github.com/kvm-x86/linux/commit/c35d8f579e50
[09/16] KVM: selftests: Enable mmu_stress_test on arm64
        https://github.com/kvm-x86/linux/commit/8abe7632a1ee
[10/16] KVM: selftests: Use vcpu_arch_put_guest() in mmu_stress_test
        https://github.com/kvm-x86/linux/commit/3a0422526404
[11/16] KVM: selftests: Precisely limit the number of guest loops in mmu_stress_test
        https://github.com/kvm-x86/linux/commit/82b542e11848
[12/16] KVM: selftests: Add a read-only mprotect() phase to mmu_stress_test
        https://github.com/kvm-x86/linux/commit/80b7859a3a43
[13/16] KVM: selftests: Verify KVM correctly handles mprotect(PROT_READ)
        https://github.com/kvm-x86/linux/commit/b6c304aec648
[14/16] KVM: selftests: Provide empty 'all' and 'clean' targets for unsupported ARCHs
        https://github.com/kvm-x86/linux/commit/43fbd8cd389f
[15/16] KVM: selftests: Use canonical $(ARCH) paths for KVM selftests directories
        https://github.com/kvm-x86/linux/commit/67730e6c53d7
[16/16] KVM: selftests: Override ARCH for x86_64 instead of using ARCH_DIR
        https://github.com/kvm-x86/linux/commit/9af04539d474


 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}/vmx_apic_access_test.c                   |   0
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 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
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 164 files changed, 587 insertions(+), 480 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%)
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