[Xen-devel] How do we add more memory ops?

["Guy Zana" <guy@xxxxxxxxxxxx>]

Hi,

 

    /*
     * To allow safe resume of do_memory_op() after preemption, we need to know
     * at what point in the page list to resume. For this purpose I steal the
     * high-order bits of the @cmd parameter, which are otherwise unused and zero.
     */
    #define MEMOP_EXTENT_SHIFT 4 /* cmd[:4] == start_extent */
    #define MEMOP_CMD_MASK     ((1 << MEMOP_EXTENT_SHIFT) - 1)

 

Why not using another hypercall argument for this?

Before I'm making any changes.. are there any limitations?

 

Thanks,

Guy.

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