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

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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 <aaronlewis@google.com>
[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 <seanjc@google.com>

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Aaron Lewis 2023-07-31 13:30:26 -07:00 • committed by Sean Christopherson

parent edb5b700f9

commit 5d1d46f9d5

2 changed files with 225 additions and 0 deletions

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4

tools/testing/selftests/kvm/Makefile

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221

tools/testing/selftests/kvm/guest_print_test.c

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