kernel/linux.git/tools/testing/selftests/kvm/Makefile, branch v6.6.134

KVM: selftests: Add -U_FORTIFY_SOURCE to avoid some unpredictable test failures

2026-02-11T12:39:09+00:00

[ Upstream commit e396a74222654486d6ab45dca5d0c54c408b8b91 ] Some distributions (such as Ubuntu) configure GCC so that _FORTIFY_SOURCE is automatically enabled at -O1 or above. This results in some fortified version of definitions of standard library functions are included. While linker resolves the symbols, the fortified versions might override the definitions in lib/string_override.c and reference to those PLT entries in GLIBC. This is not a problem for the code in host, but it is a disaster for the guest code. E.g., if build and run x86/nested_emulation_test on Ubuntu 24.04 will encounter a L1 #PF due to memset() reference to __memset_chk@plt. The option -fno-builtin-memset is not helpful here, because those fortified versions are not built-in but some definitions which are included by header, they are for different intentions. In order to eliminate the unpredictable behaviors may vary depending on the linker and platform, add the "-U_FORTIFY_SOURCE" into CFLAGS to prevent from introducing the fortified definitions. Signed-off-by: Zhiquan Li Link: https://patch.msgid.link/20260122053551.548229-1-zhiquan_li@163.com Fixes: 6b6f71484bf4 ("KVM: selftests: Implement memcmp(), memcpy(), and memset() for guest use") Cc: stable@vger.kernel.org [sean: tag for stable] Signed-off-by: Sean Christopherson [ Makefile.kvm -> Makefile ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

Merge tag 'kvm-riscv-6.6-1' of https://github.com/kvm-riscv/linux into HEAD

2023-08-31T17:25:55+00:00

KVM/riscv changes for 6.6 - Zba, Zbs, Zicntr, Zicsr, Zifencei, and Zihpm support for Guest/VM - Added ONE_REG interface for SATP mode - Added ONE_REG interface to enable/disable multiple ISA extensions - Improved error codes returned by ONE_REG interfaces - Added KVM_GET_REG_LIST ioctl() implementation for KVM RISC-V - Added get-reg-list selftest for KVM RISC-V

KVM: s390: selftests: Add selftest for single-stepping

2023-08-28T09:24:20+00:00

Test different variations of single-stepping into interrupts: - SVC and PGM interrupts; - Interrupts generated by ISKE; - Interrupts generated by instructions emulated by KVM; - Interrupts generated by instructions emulated by userspace. Reviewed-by: Claudio Imbrenda Signed-off-by: Ilya Leoshkevich Message-ID: <20230725143857.228626-7-iii@linux.ibm.com> Signed-off-by: Claudio Imbrenda [frankja@de.igm.com: s/ASSERT_EQ/TEST_ASSERT_EQ/ because function was renamed in the selftest printf series] Signed-off-by: Janosch Frank

KVM: riscv: selftests: Add get-reg-list test

2023-08-09T06:45:27+00:00

get-reg-list test is used to check for KVM registers regressions during VM migration which happens when destination host kernel missing registers that the source host kernel has. The blessed list registers was created by running on v6.5-rc3 Signed-off-by: Haibo Xu Reviewed-by: Andrew Jones Signed-off-by: Anup Patel

KVM: arm64: selftests: Split get-reg-list test code

2023-08-09T06:44:43+00:00

Split the arch-neutral test code out of aarch64/get-reg-list.c into get-reg-list.c. To do this we invent a new make variable $(SPLIT_TESTS) which expects common parts to be in the KVM selftests root and the counterparts to have the same name, but be in $(ARCH_DIR). There's still some work to be done to de-aarch64 the common get-reg-list.c, but we leave that to the next patch to avoid modifying too much code while moving it. Signed-off-by: Andrew Jones Signed-off-by: Haibo Xu Signed-off-by: Anup Patel

KVM: selftests: Add a selftest for guest prints and formatted asserts

2023-08-02T21:42:52+00:00

Add a test to exercise the various features in KVM selftest's local snprintf() and compare them to LIBC's snprintf() to ensure they behave the same. This is not an exhaustive test. KVM's local snprintf() does not implement all the features LIBC does, e.g. KVM's local snprintf() does not support floats or doubles, so testing for those features were excluded. Testing was added for the features that are expected to work to support a minimal version of printf() in the guest. Signed-off-by: Aaron Lewis [sean: use UCALL_EXIT_REASON, enable for all architectures] Link: https://lore.kernel.org/r/20230731203026.1192091-4-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Add guest_snprintf() to KVM selftests

2023-08-02T21:41:59+00:00

Add a local version of guest_snprintf() for use in the guest. Having a local copy allows the guest access to string formatting options without dependencies on LIBC. LIBC is problematic because it heavily relies on both AVX-512 instructions and a TLS, neither of which are guaranteed to be set up in the guest. The file guest_sprintf.c was lifted from arch/x86/boot/printf.c and adapted to work in the guest, including the addition of buffer length. I.e. s/sprintf/snprintf/ The functions where prefixed with "guest_" to allow guests to explicitly call them. A string formatted by this function is expected to succeed or die. If something goes wrong during the formatting process a GUEST_ASSERT() will be thrown. Signed-off-by: Aaron Lewis Link: https://lore.kernel.org/all/mtdi6smhur5rqffvpu7qux7mptonw223y2653x2nwzvgm72nlo@zyc4w3kwl3rg [sean: add a link to the discussion of other options] Link: https://lore.kernel.org/r/20230729003643.1053367-6-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: selftests: Add strnlen() to the string overrides

2023-08-02T21:41:59+00:00

Add strnlen() to the string overrides to allow it to be called in the guest. The implementation for strnlen() was taken from the kernel's generic version, lib/string.c. This will be needed when printf() is introduced. Signed-off-by: Aaron Lewis Link: https://lore.kernel.org/r/20230729003643.1053367-5-seanjc@google.com Signed-off-by: Sean Christopherson

Merge tag 'kvm-x86-selftests-6.5' of https://github.com/kvm-x86/linux into HEAD

2023-07-01T11:19:09+00:00

KVM selftests changes for 6.5: - Add a test for splitting and reconstituting hugepages during and after dirty logging - Add support for CPU pinning in demand paging test - Generate dependency files so that partial rebuilds work as expected - Misc cleanups and fixes

Merge tag 'kvm-s390-next-6.5-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

2023-07-01T11:00:11+00:00

* New uvdevice secret API * New CMM selftest * cmm fix * diag 9c racy access of target cpu fix