kernel/linux.git/tools/testing/selftests/kvm/Makefile, branch v6.4

KVM: selftests: Add test for race in kvm_recalculate_apic_map()

2023-06-03T00:21:06+00:00

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 Co-developed-by: Sean Christopherson Link: https://lore.kernel.org/r/20230602233250.1014316-4-seanjc@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

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 test for SMCCC filter

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

Add a selftest for the SMCCC filter, ensuring basic UAPI constraints (e.g. reserved ranges, non-overlapping ranges) are upheld. Additionally, test that the DENIED and FWD_TO_USER work as intended. Signed-off-by: Oliver Upton Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20230404154050.2270077-14-oliver.upton@linux.dev

Merge tag 'kvm-s390-next-6.3-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

2023-02-15T17:35:26+00:00

* Two more V!=R patches * The last part of the cmpxchg patches * A few fixes

KVM: selftests: Compile s390 tests with -march=z10

2023-02-07T17:05:59+00:00

The guest used in s390 kvm selftests is not be set up to handle all instructions the compiler might emit, i.e. vector instructions, leading to crashes. Limit what the compiler emits to the oldest machine model currently supported by Linux. Signed-off-by: Nina Schoetterl-Glausch Reviewed-by: Janosch Frank Reviewed-by: Thomas Huth Link: https://lore.kernel.org/r/20230127174552.3370169-1-nsg@linux.ibm.com Message-Id: <20230127174552.3370169-1-nsg@linux.ibm.com> Signed-off-by: Janosch Frank

KVM: selftests: Test Hyper-V extended hypercall exit to userspace

2023-02-01T22:31:27+00:00

Hyper-V extended hypercalls by default exit to userspace. Verify userspace gets the call, update the result and then verify in guest correct result is received. Add KVM_EXIT_HYPERV to list of "known" hypercalls so errors generate pretty strings. Signed-off-by: Vipin Sharma Reviewed-by: David Matlack Link: https://lore.kernel.org/r/20221212183720.4062037-14-vipinsh@google.com [sean: add KVM_EXIT_HYPERV to exit_reasons_known] Signed-off-by: Sean Christopherson

KVM: selftests: Disable "gnu-variable-sized-type-not-at-end" warning

2022-12-27T11:00:48+00:00

Disable gnu-variable-sized-type-not-at-end so that tests and libraries can create overlays of variable sized arrays at the end of structs when using a fixed number of entries, e.g. to get/set a single MSR. It's possible to fudge around the warning, e.g. by defining a custom struct that hardcodes the number of entries, but that is a burden for both developers and readers of the code. lib/x86_64/processor.c:664:19: warning: field 'header' with variable sized type 'struct kvm_msrs' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct kvm_msrs header; ^ lib/x86_64/processor.c:772:19: warning: field 'header' with variable sized type 'struct kvm_msrs' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct kvm_msrs header; ^ lib/x86_64/processor.c:787:19: warning: field 'header' with variable sized type 'struct kvm_msrs' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct kvm_msrs header; ^ 3 warnings generated. x86_64/hyperv_tlb_flush.c:54:18: warning: field 'hv_vp_set' with variable sized type 'struct hv_vpset' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct hv_vpset hv_vp_set; ^ 1 warning generated. x86_64/xen_shinfo_test.c:137:25: warning: field 'info' with variable sized type 'struct kvm_irq_routing' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct kvm_irq_routing info; ^ 1 warning generated. Signed-off-by: Sean Christopherson Message-Id: <20221213001653.3852042-12-seanjc@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Include lib.mk before consuming $(CC)

2022-12-27T11:00:48+00:00

Include lib.mk before consuming $(CC) and document that lib.mk overwrites $(CC) unless make was invoked with -e or $(CC) was specified after make (which makes the environment override the Makefile). Including lib.mk after using it for probing, e.g. for -no-pie, can lead to weirdness. Signed-off-by: Sean Christopherson Message-Id: <20221213001653.3852042-11-seanjc@google.com> Signed-off-by: Paolo Bonzini

KVM: selftests: Explicitly disable builtins for mem*() overrides

2022-12-27T11:00:48+00:00

Explicitly disable the compiler's builtin memcmp(), memcpy(), and memset(). Because only lib/string_override.c is built with -ffreestanding, the compiler reserves the right to do what it wants and can try to link the non-freestanding code to its own crud. /usr/bin/x86_64-linux-gnu-ld: /lib/x86_64-linux-gnu/libc.a(memcmp.o): in function `memcmp_ifunc': (.text+0x0): multiple definition of `memcmp'; tools/testing/selftests/kvm/lib/string_override.o: tools/testing/selftests/kvm/lib/string_override.c:15: first defined here clang: error: linker command failed with exit code 1 (use -v to see invocation) Fixes: 6b6f71484bf4 ("KVM: selftests: Implement memcmp(), memcpy(), and memset() for guest use") Reported-by: Aaron Lewis Reported-by: Raghavendra Rao Ananta Signed-off-by: Sean Christopherson Message-Id: <20221213001653.3852042-10-seanjc@google.com> Signed-off-by: Paolo Bonzini