KVM: selftests: Add kvm_gettid() wrapper and convert users

Add a KVM wrapper for the gettid() syscall so that tests don't have to
open code the syscall() themselves.  Unfortunately, not all flavors of
libc that KVM selftests support provide gettid().  Convert all existing
users of the syscall to the new wrapper.

Note, per the gettid() manpage[1], "This call is always successful", i.e.
prefixing kvm_ to the syscall name is aligned with the goal of providing
syscall wrappers that guarantee success.

No functional changes intended.

Link: https://man7.org/linux/man-pages/man2/gettid.2.html [1]
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Josh Hilke <jrhilke@google.com>
[sean: massage changelog]
Link: https://patch.msgid.link/20260626213534.3866178-16-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions