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2023-07-01Merge tag 'kvm-x86-misc-6.5' of https://github.com/kvm-x86/linux into HEADPaolo Bonzini
KVM x86 changes for 6.5: * Move handling of PAT out of MTRR code and dedup SVM+VMX code * Fix output of PIC poll command emulation when there's an interrupt * Add a maintainer's handbook to document KVM x86 processes, preferred coding style, testing expectations, etc. * Misc cleanups
2023-07-01Merge tag 'kvm-s390-next-6.5-1' of ↵Paolo Bonzini
https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD * New uvdevice secret API * New CMM selftest * cmm fix * diag 9c racy access of target cpu fix
2023-06-26Merge tag 'arm64-upstream' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux Pull arm64 updates from Catalin Marinas: "Notable features are user-space support for the memcpy/memset instructions and the permission indirection extension. - Support for the Armv8.9 Permission Indirection Extensions. While this feature doesn't add new functionality, it enables future support for Guarded Control Stacks (GCS) and Permission Overlays - User-space support for the Armv8.8 memcpy/memset instructions - arm64 perf: support the HiSilicon SoC uncore PMU, Arm CMN sysfs identifier, support for the NXP i.MX9 SoC DDRC PMU, fixes and cleanups - Removal of superfluous ISBs on context switch (following retrospective architecture tightening) - Decode the ISS2 register during faults for additional information to help with debugging - KPTI clean-up/simplification of the trampoline exit code - Addressing several -Wmissing-prototype warnings - Kselftest improvements for signal handling and ptrace - Fix TPIDR2_EL0 restoring on sigreturn - Clean-up, robustness improvements of the module allocation code - More sysreg conversions to the automatic register/bitfields generation - CPU capabilities handling cleanup - Arm documentation updates: ACPI, ptdump" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (124 commits) kselftest/arm64: Add a test case for TPIDR2 restore arm64/signal: Restore TPIDR2 register rather than memory state arm64: alternatives: make clean_dcache_range_nopatch() noinstr-safe Documentation/arm64: Add ptdump documentation arm64: hibernate: remove WARN_ON in save_processor_state kselftest/arm64: Log signal code and address for unexpected signals docs: perf: Fix warning from 'make htmldocs' in hisi-pmu.rst arm64/fpsimd: Exit streaming mode when flushing tasks docs: perf: Add new description for HiSilicon UC PMU drivers/perf: hisi: Add support for HiSilicon UC PMU driver drivers/perf: hisi: Add support for HiSilicon H60PA and PAv3 PMU driver perf: arm_cspmu: Add missing MODULE_DEVICE_TABLE perf/arm-cmn: Add sysfs identifier perf/arm-cmn: Revamp model detection perf/arm_dmc620: Add cpumask arm64: mm: fix VA-range sanity check arm64/mm: remove now-superfluous ISBs from TTBR writes Documentation/arm64: Update ACPI tables from BBR Documentation/arm64: Update references in arm-acpi Documentation/arm64: Update ARM and arch reference ...
2023-06-16KVM: s390: selftests: add selftest for CMMA migrationNico Boehr
Add a selftest for CMMA migration on s390. The tests cover: - interaction of dirty tracking and migration mode, see my recent patch "KVM: s390: disable migration mode when dirty tracking is disabled" [1], - several invalid calls of KVM_S390_GET_CMMA_BITS, for example: invalid flags, CMMA support off, with/without peeking - ensure KVM_S390_GET_CMMA_BITS initally reports all pages as dirty, - ensure KVM_S390_GET_CMMA_BITS properly skips over holes in memslots, but also non-dirty pages Note that without the patch at [1] and the small fix in this series, the selftests will fail. [1] https://lore.kernel.org/all/20230127140532.230651-2-nrb@linux.ibm.com/ Signed-off-by: Nico Boehr <nrb@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Message-Id: <20230324145424.293889-3-nrb@linux.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> [frankja@linux.ibm.com: squashed 20230606150510.671301-1-nrb@linux.ibm.com / "KVM: s390: selftests: CMMA: don't run if CMMA not supported"] Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
2023-06-13KVM: selftests: Add new CFLAGS to generate dependency filesYu Zhang
Add "-MD" in CFLAGS to generate dependency files. Currently, each time a header file is updated in KVM selftest, we will have to run "make clean && make" to rebuild the whole test suite. By adding new compiling flags and dependent rules in Makefile, we do not need to make clean && make each time a header file is updated. Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com> Link: https://lore.kernel.org/r/20230601080338.212942-1-yu.c.zhang@linux.intel.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-06-06KVM: selftests: Allow specify physical cpu list in demand paging testPeter Xu
Mimic the dirty log test and allow the user to pin demand paging test tasks to physical CPUs. Put the help message into a general helper as suggested by Sean. Signed-off-by: Peter Xu <peterx@redhat.com> [sean: rebase, tweak arg ordering, add "print" to helper, print program name] Link: https://lore.kernel.org/r/20230607001226.1398889-1-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-06-06KVM: selftests: get-reg-list: add Permission Indirection registersJoey Gouly
Add new system registers: - ID_AA64MMFR3_EL1 - TCR2_EL1 - PIRE0_EL1 - PIR_EL1 Signed-off-by: Joey Gouly <joey.gouly@arm.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Oliver Upton <oliver.upton@linux.dev> Cc: Mark Brown <broonie@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20230606145859.697944-21-joey.gouly@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2023-06-06KVM: selftests: get-reg-list: support ID register featuresJoey Gouly
This stops the test complaining about missing registers, when running on an older kernel that does not support newer features. Signed-off-by: Joey Gouly <joey.gouly@arm.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Oliver Upton <oliver.upton@linux.dev> Cc: Mark Brown <broonie@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Link: https://lore.kernel.org/r/20230606145859.697944-20-joey.gouly@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2023-06-02KVM: selftests: Add test for race in kvm_recalculate_apic_map()Michal Luczaj
Keep switching between LAPIC_MODE_X2APIC and LAPIC_MODE_DISABLED during APIC map construction to hunt for TOCTOU bugs in KVM. KVM's optimized map recalc makes multiple passes over the list of vCPUs, and the calculations ignore vCPU's whose APIC is hardware-disabled, i.e. there's a window where toggling LAPIC_MODE_DISABLED is quite interesting. Signed-off-by: Michal Luczaj <mhal@rbox.co> Co-developed-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/20230602233250.1014316-4-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-06-01KVM: selftests: Extend cpuid_test to verify KVM_GET_CPUID2 "nent" updatesSean Christopherson
Verify that KVM reports the actual number of CPUID entries on success, but doesn't touch the userspace struct on failure (which for better or worse, is KVM's ABI). Link: https://lore.kernel.org/r/20230526210340.2799158-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-06-01KVM: selftests: Add dirty logging page splitting testBen Gardon
Add a test for page splitting during dirty logging and for hugepage recovery after dirty logging. Page splitting represents non-trivial behavior, which is complicated by MANUAL_PROTECT mode, which causes pages to be split on the first clear, instead of when dirty logging is enabled. Add a test which makes assertions about page counts to help define the expected behavior of page splitting and to provide needed coverage of the behavior. This also helps ensure that a failure in eager page splitting is not covered up by splitting in the vCPU path. Tested by running the test on an Intel Haswell machine w/wo MANUAL_PROTECT. Reviewed-by: Vipin Sharma <vipinsh@google.com> Signed-off-by: Ben Gardon <bgardon@google.com> Link: https://lore.kernel.org/r/20230131181820.179033-3-bgardon@google.com [sean: let the user run without hugetlb, as suggested by Paolo] Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-06-01KVM: selftests: Move dirty logging functions to memstress.(c|h)Ben Gardon
Move some helper functions from dirty_log_perf_test.c to the memstress library so that they can be used in a future commit which tests page splitting during dirty logging. Reviewed-by: Vipin Sharma <vipinsh@google.com> Signed-off-by: Ben Gardon <bgardon@google.com> Link: https://lore.kernel.org/r/20230131181820.179033-2-bgardon@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-06-01KVM: selftests: touch all pages of args on each memstress iterationPaolo Bonzini
Access the same memory addresses on each iteration of the memstress guest code. This ensures that the state of KVM's page tables is the same after every iteration, including the pages that host the guest page tables for args and vcpu_args. This difference is visible when running the proposed dirty_log_page_splitting_test[*] on AMD, or on Intel with pml=0 and eptad=0. The tests fail due to different semantics of dirty bits for page-table pages on AMD (and eptad=0) and Intel. Both AMD and Intel with eptad=0 treat page-table accesses as writes, therefore more pages are dropped before the repopulation phase when dirty logging is disabled. The "missing" page had been included in the population phase because it hosts the page tables for vcpu_args, but repopulation does not need it." Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Vipin Sharma <vipinsh@google.com> Link: https://lore.kernel.org/r/20230412200913.1570873-1-pbonzini@redhat.com [sean: add additional details in changelog] Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-05-31KVM: selftests: Allow dumping per-vcpu info for uffd threadsPeter Xu
There's one PER_VCPU_DEBUG in per-vcpu uffd threads but it's never hit. Trigger that when quit in normal ways (kick pollfd[1]), meanwhile fix the number of nanosec calculation. Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: James Houghton <jthoughton@google.com> Link: https://lore.kernel.org/r/20230427201112.2164776-3-peterx@redhat.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-05-31KVM: selftests: Setup vcpu_alias only for minor mode testPeter Xu
This fixes two things: - Unbreaks MISSING mode test on anonymous memory type - Prefault alias mem before uffd thread creations, otherwise the uffd thread timing will be inaccurate when guest mem size is large, because it'll take prefault time into total time. Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: James Houghton <jthoughton@google.com> Link: https://lore.kernel.org/r/20230427201112.2164776-2-peterx@redhat.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-05-30KVM: selftests: Fix spelling mistake "miliseconds" -> "milliseconds"Colin Ian King
There is a spelling mistake in the help for the -p option. Fix it. Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Link: https://lore.kernel.org/r/20230417175322.53249-1-colin.i.king@gmail.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-05-30KVM: selftests: Refactor stable TSC check to use TEST_REQUIRE()Sean Christopherson
Refactor the nested TSC scaling test's check on a stable system TSC to use TEST_REQUIRE() to do the heavy lifting when the system doesn't have a stable TSC. Using a helper+TEST_REQUIRE() eliminates the need for gotos and a custom message. Cc: Hao Ge <gehao@kylinos.cn> Cc: Vipin Sharma <vipinsh@google.com> Link: https://lore.kernel.org/r/20230406001724.706668-1-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-26Merge tag 'kvm-x86-selftests-6.4' of https://github.com/kvm-x86/linux into HEADPaolo Bonzini
KVM selftests, and an AMX/XCR0 bugfix, for 6.4: - Don't advertise XTILE_CFG in KVM_GET_SUPPORTED_CPUID if XTILE_DATA is not being reported due to userspace not opting in via prctl() - Overhaul the AMX selftests to improve coverage and cleanup the test - Misc cleanups
2023-04-26Merge tag 'kvm-x86-pmu-6.4' of https://github.com/kvm-x86/linux into HEADPaolo Bonzini
KVM x86 PMU changes for 6.4: - Disallow virtualizing legacy LBRs if architectural LBRs are available, the two are mutually exclusive in hardware - Disallow writes to immutable feature MSRs (notably PERF_CAPABILITIES) after KVM_RUN, and overhaul the vmx_pmu_caps selftest to better validate PERF_CAPABILITIES - Apply PMU filters to emulated events and add test coverage to the pmu_event_filter selftest - Misc cleanups and fixes
2023-04-21Merge branch kvm-arm64/smccc-filtering into kvmarm-master/nextMarc Zyngier
* kvm-arm64/smccc-filtering: : . : SMCCC call filtering and forwarding to userspace, courtesy of : Oliver Upton. From the cover letter: : : "The Arm SMCCC is rather prescriptive in regards to the allocation of : SMCCC function ID ranges. Many of the hypercall ranges have an : associated specification from Arm (FF-A, PSCI, SDEI, etc.) with some : room for vendor-specific implementations. : : The ever-expanding SMCCC surface leaves a lot of work within KVM for : providing new features. Furthermore, KVM implements its own : vendor-specific ABI, with little room for other implementations (like : Hyper-V, for example). Rather than cramming it all into the kernel we : should provide a way for userspace to handle hypercalls." : . KVM: selftests: Fix spelling mistake "KVM_HYPERCAL_EXIT_SMC" -> "KVM_HYPERCALL_EXIT_SMC" KVM: arm64: Test that SMC64 arch calls are reserved KVM: arm64: Prevent userspace from handling SMC64 arch range KVM: arm64: Expose SMC/HVC width to userspace KVM: selftests: Add test for SMCCC filter KVM: selftests: Add a helper for SMCCC calls with SMC instruction KVM: arm64: Let errors from SMCCC emulation to reach userspace KVM: arm64: Return NOT_SUPPORTED to guest for unknown PSCI version KVM: arm64: Introduce support for userspace SMCCC filtering KVM: arm64: Add support for KVM_EXIT_HYPERCALL KVM: arm64: Use a maple tree to represent the SMCCC filter KVM: arm64: Refactor hvc filtering to support different actions KVM: arm64: Start handling SMCs from EL1 KVM: arm64: Rename SMC/HVC call handler to reflect reality KVM: arm64: Add vm fd device attribute accessors KVM: arm64: Add a helper to check if a VM has ran once KVM: x86: Redefine 'longmode' as a flag for KVM_EXIT_HYPERCALL Signed-off-by: Marc Zyngier <maz@kernel.org>
2023-04-21Merge branch kvm-arm64/selftest/misc-6.4 into kvmarm-master/nextMarc Zyngier
* kvm-arm64/selftest/misc-6.4: : . : Misc selftest updates for 6.4 : : - Add comments for recently added ID registers : . KVM: selftests: Comment newly defined aarch64 ID registers Signed-off-by: Marc Zyngier <maz@kernel.org>
2023-04-21Merge branch kvm-arm64/selftest/lpa into kvmarm-master/nextMarc Zyngier
* kvm-arm64/selftest/lpa: : . : Selftest fixes addressing PTE and TTBR0_EL1 encodings for : 52bit PAs : . KVM: selftests: arm64: Fix ttbr0_el1 encoding for PA bits > 48 KVM: selftests: arm64: Fix pte encode/decode for PA bits > 48 KVM: selftests: Fixup config fragment for access_tracking_perf_test Signed-off-by: Marc Zyngier <maz@kernel.org>
2023-04-14KVM: selftests: Test the PMU event "Instructions retired"Aaron Lewis
Add testing for the event "Instructions retired" (0xc0) in the PMU event filter on both Intel and AMD to ensure that the event doesn't count when it is disallowed. Unlike most of the other events, the event "Instructions retired" will be incremented by KVM when an instruction is emulated. Test that this case is being properly handled and that KVM doesn't increment the counter when that event is disallowed. Signed-off-by: Aaron Lewis <aaronlewis@google.com> Link: https://lore.kernel.org/r/20230307141400.1486314-6-aaronlewis@google.com Link: https://lore.kernel.org/r/20230407233254.957013-7-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-14KVM: selftests: Copy full counter values from guest in PMU event filter testSean Christopherson
Use a single struct to track all PMC event counts in the PMU filter test, and copy the full struct to/from the guest when running and measuring each guest workload. Using a common struct avoids naming conflicts, e.g. the loads/stores testcase has claimed "perf_counter", and eliminates the unnecessary truncation of the counter values when they are propagated from the guest MSRs to the host structs. Zero the struct before running the guest workload to ensure that the test doesn't get a false pass due to consuming data from a previous run. Link: https://lore.kernel.org/r/20230407233254.957013-6-seanjc@google.com Reviewed by: Aaron Lewis <aaronlewis@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-14KVM: selftests: Use error codes to signal errors in PMU event filter testSean Christopherson
Use '0' to signal success and '-errno' to signal failure in the PMU event filter test so that the values are slightly less magical/arbitrary. Using '0' in the error paths is especially confusing as understanding it's an error value requires following the breadcrumbs to the host code that ultimately consumes the value. Arguably there should also be a #define for "success", but 0/-errno is a common enough pattern that defining another macro on top would likely do more harm than good. Link: https://lore.kernel.org/r/20230407233254.957013-5-seanjc@google.com Reviewed by: Aaron Lewis <aaronlewis@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-14KVM: selftests: Print detailed info in PMU event filter assertsAaron Lewis
Provide the actual vs. expected count in the PMU event filter test's asserts instead of relying on pr_info() to provide the context, e.g. so that all information needed to triage a failure is readily available even if the environment in which the test is run captures only the assert itself. Signed-off-by: Aaron Lewis <aaronlewis@google.com> [sean: rewrite changelog] Link: https://lore.kernel.org/r/20230407233254.957013-4-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-14KVM: selftests: Add helpers for PMC asserts in PMU event filter testAaron Lewis
Add helper macros to consolidate the asserts that a PMC is/isn't counting (branch) instructions retired. This will make it easier to add additional asserts related to counting instructions later on. No functional changes intended. Signed-off-by: Aaron Lewis <aaronlewis@google.com> [sean: add "INSTRUCTIONS", massage changelog] Link: https://lore.kernel.org/r/20230407233254.957013-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-14KVM: selftests: Add a common helper for the PMU event filter guest codeAaron Lewis
Split out the common parts of the Intel and AMD guest code in the PMU event filter test into a helper function. This is in preparation for adding additional counters to the test. No functional changes intended. Signed-off-by: Aaron Lewis <aaronlewis@google.com> Link: https://lore.kernel.org/r/20230407233254.957013-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-14KVM: selftests: Fix spelling mistake "perrmited" -> "permitted"Colin Ian King
There is a spelling mistake in a test report message. Fix it. Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Link: https://lore.kernel.org/r/20230414080809.1678603-1-colin.i.king@gmail.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-11KVM: selftests: Add test to verify KVM's supported XCR0Aaron Lewis
Check both architectural rules and KVM's ABI for KVM_GET_SUPPORTED_CPUID to ensure the supported xfeatures[1] don't violate any of them. The architectural rules[2] and KVM's contract with userspace ensure for a given feature, e.g. sse, avx, amx, etc... their associated xfeatures are either all sets or none of them are set, and any dependencies are enabled if needed. [1] EDX:EAX of CPUID.(EAX=0DH,ECX=0) [2] SDM vol 1, 13.3 ENABLING THE XSAVE FEATURE SET AND XSAVE-ENABLED FEATURES Cc: Mingwei Zhang <mizhang@google.com> Signed-off-by: Aaron Lewis <aaronlewis@google.com> [sean: expand comments, use a fancy X86_PROPERTY] Reviewed-by: Aaron Lewis <aaronlewis@google.com> Tested-by: Aaron Lewis <aaronlewis@google.com> Link: https://lore.kernel.org/r/20230405004520.421768-7-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-11KVM: selftests: Add all known XFEATURE masks to common codeAaron Lewis
Add all known XFEATURE masks to processor.h to make them more broadly available in KVM selftests. Relocate and clean up the exiting AMX (XTILE) defines in processor.h, e.g. drop the intermediate define and use BIT_ULL. Signed-off-by: Aaron Lewis <aaronlewis@google.com> Reviewed-by: Aaron Lewis <aaronlewis@google.com> Tested-by: Aaron Lewis <aaronlewis@google.com> Link: https://lore.kernel.org/r/20230405004520.421768-6-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-11KVM: selftests: Rework dynamic XFeature helper to take mask, not bitSean Christopherson
Take the XFeature mask in __vm_xsave_require_permission() instead of the bit so that there's no need to define macros for both the bit and the mask. Asserting that only a single bit is set and retrieving said bit is easy enough via log2 helpers. Opportunistically clean up the error message for the ARCH_REQ_XCOMP_GUEST_PERM sanity check. Reviewed-by: Aaron Lewis <aaronlewis@google.com> Tested-by: Aaron Lewis <aaronlewis@google.com> Link: https://lore.kernel.org/r/20230405004520.421768-5-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-11KVM: selftests: Move XGETBV and XSETBV helpers to common codeAaron Lewis
The instructions XGETBV and XSETBV are useful to other tests. Move them to processor.h to make them more broadly available. No functional change intended. Reviewed-by: Jim Mattson <jmattson@google.com> Signed-off-by: Aaron Lewis <aaronlewis@google.com> Reviewed-by: Mingwei Zhang <mizhang@google.com> [sean: reword shortlog] Reviewed-by: Aaron Lewis <aaronlewis@google.com> Tested-by: Aaron Lewis <aaronlewis@google.com> Link: https://lore.kernel.org/r/20230405004520.421768-4-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-08KVM: selftests: Fix spelling mistake "KVM_HYPERCAL_EXIT_SMC" -> ↵Colin Ian King
"KVM_HYPERCALL_EXIT_SMC" There is a spelling mistake in a test assert message. Fix it. Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Reviewed-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20230406080226.122955-1-colin.i.king@gmail.com
2023-04-08KVM: arm64: Test that SMC64 arch calls are reservedOliver Upton
Assert that the SMC64 view of the Arm architecture range is reserved by KVM and cannot be filtered by userspace. Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20230408121732.3411329-3-oliver.upton@linux.dev
2023-04-06KVM: selftests: Verify LBRs are disabled if vPMU is disabledSean Christopherson
Verify that disabling the guest's vPMU via CPUID also disables LBRs. KVM has had at least one bug where LBRs would remain enabled even though the intent was to disable everything PMU related. Link: https://lore.kernel.org/r/20230311004618.920745-22-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Add negative testcase for PEBS format in PERF_CAPABILITIESSean Christopherson
Expand the immutable features sub-test for PERF_CAPABILITIES to verify KVM rejects any attempt to use a PEBS format other than the host's. Link: https://lore.kernel.org/r/20230311004618.920745-21-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Refactor LBR_FMT test to avoid use of separate macroSean Christopherson
Rework the LBR format test to use the bitfield instead of a separate mask macro, mainly so that adding a nearly-identical PEBS format test doesn't have to copy-paste-tweak the macro too. No functional change intended. Link: https://lore.kernel.org/r/20230311004618.920745-20-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Drop "all done!" printf() from PERF_CAPABILITIES testSean Christopherson
Drop the arbitrary "done" message from the VMX PMU caps test, it's pretty obvious the test is done when the process exits. Link: https://lore.kernel.org/r/20230311004618.920745-19-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Test post-KVM_RUN writes to PERF_CAPABILITIESSean Christopherson
Now that KVM disallows changing PERF_CAPABILITIES after KVM_RUN, expand the host side checks to verify KVM rejects any attempts to change bits from userspace. Link: https://lore.kernel.org/r/20230311004618.920745-18-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Expand negative testing of guest writes to PERF_CAPABILITIESSean Christopherson
Test that the guest can't write 0 to PERF_CAPABILITIES, can't write the current value, and can't toggle _any_ bits. There is no reason to special case the LBR format. Link: https://lore.kernel.org/r/20230311004618.920745-17-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Test all immutable non-format bits in PERF_CAPABILITIESSean Christopherson
Add negative testing of all immutable bits in PERF_CAPABILITIES, i.e. single bits that are reserved-0 or are effectively reserved-1 by KVM. Omit LBR and PEBS format bits from the test as it's easier to test them manually than it is to add safeguards to the comment path, e.g. toggling a single bit can yield a format of '0', which is legal as a "disable" value. Link: https://lore.kernel.org/r/20230311004618.920745-16-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Test all fungible features in PERF_CAPABILITIESSean Christopherson
Verify that userspace can set all fungible features in PERF_CAPABILITIES. Drop the now unused #define of the "full-width writes" flag. Link: https://lore.kernel.org/r/20230311004618.920745-15-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Drop now-redundant checks on PERF_CAPABILITIES writesSean Christopherson
Now that vcpu_set_msr() verifies the expected "read what was wrote" semantics of all durable MSRs, including PERF_CAPABILITIES, drop the now-redundant manual checks in the VMX PMU caps test. Link: https://lore.kernel.org/r/20230311004618.920745-14-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Verify KVM preserves userspace writes to "durable" MSRsSean Christopherson
Assert that KVM provides "read what you wrote" semantics for all "durable" MSRs (for lack of a better name). The extra coverage is cheap from a runtime performance perspective, and verifying the behavior in the common helper avoids gratuitous copy+paste in individual tests. Note, this affects all tests that set MSRs from userspace! Link: https://lore.kernel.org/r/20230311004618.920745-13-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Print out failing MSR and value in vcpu_set_msr()Sean Christopherson
Reimplement vcpu_set_msr() as a macro and pretty print the failing MSR (when possible) and the value if KVM_SET_MSRS fails instead of using the using the standard KVM_IOCTL_ERROR(). KVM_SET_MSRS is somewhat odd in that it returns the index of the last successful write, i.e. will be '0' on failure barring an entirely different KVM bug. And for writing MSRs, the MSR being written and the value being written are almost always relevant to the failure, i.e. just saying "failed!" doesn't help debug. Place the string goo in a separate macro in anticipation of using it to further expand MSR testing. Link: https://lore.kernel.org/r/20230311004618.920745-12-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Assert that full-width PMC writes are supported if PDCM=1Sean Christopherson
KVM emulates full-width PMC writes in software, assert that KVM reports full-width writes as supported if PERF_CAPABILITIES is supported. Link: https://lore.kernel.org/r/20230311004618.920745-11-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Move 0/initial value PERF_CAPS checks to dedicated sub-testSean Christopherson
Use a separate sub-test to verify userspace can clear PERF_CAPABILITIES and restore it to the KVM-supported value, as the testcase isn't unique to the LBR format. Link: https://lore.kernel.org/r/20230311004618.920745-10-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-06KVM: selftests: Split PMU caps sub-tests to avoid writing MSR after KVM_RUNSean Christopherson
Split the PERF_CAPABILITIES subtests into two parts so that the LBR format testcases don't execute after KVM_RUN. Similar to the guest CPUID model, KVM will soon disallow changing PERF_CAPABILITIES after KVM_RUN, at which point attempting to set the MSR after KVM_RUN will yield false positives and/or false negatives depending on what the test is trying to do. Land the LBR format test in a more generic "immutable features" test in anticipation of expanding its scope to other immutable features. Link: https://lore.kernel.org/r/20230311004618.920745-6-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-04-05KVM: selftests: Close opened file descriptor in stable_tsc_check_supported()Hao Ge
Close the "current_clocksource" file descriptor before returning or exiting from stable_tsc_check_supported() in vmx_nested_tsc_scaling_test. Signed-off-by: Hao Ge <gehao@kylinos.cn> Reviewed-by: Vipin Sharma <vipinsh@google.com> Link: https://lore.kernel.org/r/20230405101350.259000-1-gehao@kylinos.cn Signed-off-by: Sean Christopherson <seanjc@google.com>
generated by cgit (git 2.34.1) at 2025-07-19 12:21:22 +0000