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    Subject[PATCH v2 39/42] KVM: selftests: Skip AMX test if ARCH_REQ_XCOMP_GUEST_PERM isn't supported
    From
    Skip the AMX test instead of silently returning if the host kernel
    doesn't support ARCH_REQ_XCOMP_GUEST_PERM. KVM didn't support XFD until
    v5.17, so it's extremely unlikely allowing the test to run on a pre-v5.15
    kernel is the right thing to do.

    Signed-off-by: Sean Christopherson <seanjc@google.com>
    ---
    tools/testing/selftests/kvm/lib/x86_64/processor.c | 9 +--------
    1 file changed, 1 insertion(+), 8 deletions(-)

    diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
    index c7fe584c71ed..ee346a280482 100644
    --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
    +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
    @@ -601,14 +601,7 @@ void vm_xsave_req_perm(int bit)

    TEST_REQUIRE(bitmask & (1ULL << bit));

    - rc = syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit);
    -
    - /*
    - * The older kernel version(<5.15) can't support
    - * ARCH_REQ_XCOMP_GUEST_PERM and directly return.
    - */
    - if (rc)
    - return;
    + TEST_REQUIRE(!syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit));

    rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_GUEST_PERM, &bitmask);
    TEST_ASSERT(rc == 0, "prctl(ARCH_GET_XCOMP_GUEST_PERM) error: %ld", rc);
    --
    2.36.1.476.g0c4daa206d-goog
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