linux-stable.git/tools/testing/selftests/kvm/include, branch linux-6.5.y

KVM: selftests: Use pread() to read binary stats header

2023-07-29T15:05:28+00:00

Use pread() with an explicit offset when reading the header and the header
name for a binary stats fd so that the common helper and the binary stats
test don't subtly rely on the file effectively being untouched, e.g. to
allow multiple reads of the header, name, etc.

Signed-off-by: Sean Christopherson 
Message-Id: <20230711230131.648752-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini

KVM: selftests: Allow specify physical cpu list in demand paging test

2023-06-07T00:29:49+00:00

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 
[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

KVM: selftests: Move dirty logging functions to memstress.(c|h)

2023-06-01T21:03:18+00:00

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 
Signed-off-by: Ben Gardon 
Link: https://lore.kernel.org/r/20230131181820.179033-2-bgardon@google.com
Signed-off-by: Sean Christopherson

Merge tag 'kvm-x86-selftests-6.4' of https://github.com/kvm-x86/linux into HEAD

2023-04-26T19:56:01+00:00

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

Merge tag 'kvm-x86-pmu-6.4' of https://github.com/kvm-x86/linux into HEAD

2023-04-26T19:53:36+00:00

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

KVM: selftests: Add test to verify KVM's supported XCR0

2023-04-11T17:19:04+00:00

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 
Signed-off-by: Aaron Lewis 
[sean: expand comments, use a fancy X86_PROPERTY]
Reviewed-by: Aaron Lewis 
Tested-by: Aaron Lewis 
Link: https://lore.kernel.org/r/20230405004520.421768-7-seanjc@google.com
Signed-off-by: Sean Christopherson

KVM: selftests: Add all known XFEATURE masks to common code

2023-04-11T17:19:03+00:00

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 
Reviewed-by: Aaron Lewis 
Tested-by: Aaron Lewis 
Link: https://lore.kernel.org/r/20230405004520.421768-6-seanjc@google.com
Signed-off-by: Sean Christopherson

KVM: selftests: Rework dynamic XFeature helper to take mask, not bit

2023-04-11T17:19:03+00:00

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 
Tested-by: Aaron Lewis 
Link: https://lore.kernel.org/r/20230405004520.421768-5-seanjc@google.com
Signed-off-by: Sean Christopherson

KVM: selftests: Move XGETBV and XSETBV helpers to common code

2023-04-11T17:19:03+00:00

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 
Signed-off-by: Aaron Lewis 
Reviewed-by: Mingwei Zhang 
[sean: reword shortlog]
Reviewed-by: Aaron Lewis 
Tested-by: Aaron Lewis 
Link: https://lore.kernel.org/r/20230405004520.421768-4-seanjc@google.com
Signed-off-by: Sean Christopherson

KVM: selftests: Verify KVM preserves userspace writes to "durable" MSRs

2023-04-06T21:58:44+00:00

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