id	summary	reporter	owner	description	type	status	component	version	resolution	keywords	cc	guest	host
16999	VBoxDrv: Too many CPUs (288) for the GIP (max 256)	okkhoy		"The initialization  here:

{{{
include/iprt/types.h:# define RTCPUSET_MAX_CPUS      256
}}}

and the check : 

{{{
    /*
     * Check the CPU count.
     */
    cCpus = RTMpGetArraySize();
    if (   cCpus > RTCPUSET_MAX_CPUS
#if RTCPUSET_MAX_CPUS != 256
        || cCpus > 256 /* ApicId is used for the mappings */
#endif
        )
    {
        SUPR0Printf(""VBoxDrv: Too many CPUs (%u) for the GIP (max %u)\n"", cCpus, RT_MIN(RTCPUSET_MAX_CPUS, 256));
        return VERR_TOO_MANY_CPUS;
    }

}}}

in file src/VBox/HostDrivers/Support/SUPDrvGip.cpp  prevents installation of virtualbox on (Linux) server with > 256 cores.

"	defect	new	other	VirtualBox 5.1.26				other	Linux