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0342ee761e
This is used as a signal for VMware Tools to know if a command it attempted to invoke, failed or is unsupported. As a result, VMware Tools will either report failure to user or fallback to another backdoor command in attempt to perform some operation. A few examples: * open-vm-tools TimeSyncReadHost() function fallbacks to CMD_GETTIMEFULL command when CMD_GETTIMEFULL_WITH_LAG fails/unsupported. * open-vm-tools Hostinfo_NestingSupported() function verifies EAX != -1 to check for success. * open-vm-tools Hostinfo_VCPUInfoBackdoor() functions checks if reserved-bit is set to indicate command is unimplemented. Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com> Signed-off-by: Liran Alon <liran.alon@oracle.com> Message-Id: <20200312165431.82118-5-liran.alon@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>