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KVM: selftests: Add GUEST_ASSERT variants to pass values to host 

Add variants of GUEST_ASSERT to pass values back to the host, e.g. to
help debug/understand a failure when the the cause of the assert isn't
necessarily binary.

It'd probably be possible to auto-calculate the number of arguments and
just have a single GUEST_ASSERT, but there are a limited number of
variants and silently eating arguments could lead to subtle code bugs.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200410231707.7128-5-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-04-10 16:17:01 -07:00 committed by Paolo Bonzini
parent 8c996e4dae
commit 3e6b941267
1 changed files with 20 additions and 5 deletions
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25
tools/testing/selftests/kvm/include/kvm_util.h
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@ -313,11 +313,26 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
#define GUEST_SYNC(stage) ucall(UCALL_SYNC, 2, "hello", stage)
#define GUEST_DONE() ucall(UCALL_DONE, 0)
#define GUEST_ASSERT(_condition) do { \
if (!(_condition)) \
ucall(UCALL_ABORT, 2, \
"Failed guest assert: " \
#_condition, __LINE__); \
#define __GUEST_ASSERT(_condition, _nargs, _args...) do { \
if (!(_condition)) \
ucall(UCALL_ABORT, 2 + _nargs, \
"Failed guest assert: " \
#_condition, __LINE__, _args); \
} while (0)
#define GUEST_ASSERT(_condition) \
__GUEST_ASSERT((_condition), 0, 0)
#define GUEST_ASSERT_1(_condition, arg1) \
__GUEST_ASSERT((_condition), 1, (arg1))
#define GUEST_ASSERT_2(_condition, arg1, arg2) \
__GUEST_ASSERT((_condition), 2, (arg1), (arg2))
#define GUEST_ASSERT_3(_condition, arg1, arg2, arg3) \
__GUEST_ASSERT((_condition), 3, (arg1), (arg2), (arg3))
#define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
__GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
#endif /* SELFTEST_KVM_UTIL_H */