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KVM: selftests: Return a value from vcpu_get_reg() instead of using a…
…n out-param Return a uint64_t from vcpu_get_reg() instead of having the caller provide a pointer to storage, as none of the KVM_GET_ONE_REG usage in KVM selftests accesses a register larger than 64 bits, and vcpu_set_reg() only accepts a 64-bit value. If a use case comes along that needs to get a register that is larger than 64 bits, then a utility can be added to assert success and take a void pointer, but until then, forcing an out param yields ugly code and prevents feeding the output of vcpu_get_reg() into vcpu_set_reg(). Signed-off-by: Sean Christopherson <[email protected]>
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