Reserving contiguous memory

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7.1 z/VM guest

z/VM® CP might return large responses that require sufficient contiguous memory.

The default amount of contiguous memory that is reserved for the z/VM CP interface is set through the CONFIG_VMCP_CMA_SIZE kernel build option. You can override this default with the vmcp_cma= kernel parameter.
Figure 1. z/VM CP interface kernel parameter syntax

1 vmcp_cma=<size>

where <size> is the amount, in byte, of contiguous memory to be reserved. Valid values are integers, optionally with a suffix M for MiB or G for GiB.

Example: The following specification reserves 6 MiB of contiguous memory:
 vmcp_cma=6M