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Return a uint64_t from vcpu_get_reg() instead of having the caller provide a pointer to storage, as none of the vcpu_get_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(). Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Link: https://lore.kernel.org/r/20241128005547.4077116-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>