linux-stable.git/tools/testing/selftests/kvm/include, branch linux-6.4.y

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

KVM: selftests: Print out failing MSR and value in vcpu_set_msr()

2023-04-06T21:58:43+00:00

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

KVM: selftests: Add a helper for SMCCC calls with SMC instruction

2023-04-05T11:07:42+00:00

Build a helper for doing SMCs in selftests by macro-izing the current
HVC implementation and taking the conduit instruction as an argument.

Signed-off-by: Oliver Upton 
Signed-off-by: Marc Zyngier 
Link: https://lore.kernel.org/r/20230404154050.2270077-13-oliver.upton@linux.dev

KVM: selftests: Check that XTILEDATA supports XFD

2023-03-24T21:21:42+00:00

Check that XTILEDATA supports XFD. In amx_test, add the requirement that
the guest allows the xfeature, XTILEDATA, to be set in XFD. Otherwise, the
test may fail.

Signed-off-by: Aaron Lewis 
Signed-off-by: Mingwei Zhang 
Link: https://lore.kernel.org/r/20230221163655.920289-14-mizhang@google.com
Signed-off-by: Sean Christopherson