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The rmap array in the guest memslot is an array of size number of guest pages, allocated at memslot creation time. Each rmap entry in this array is used to store information about the guest page to which it corresponds. For example for a hpt guest it is used to store a lock bit, rc bits, a present bit and the index of a hpt entry in the guest hpt which maps this page. For a radix guest which is running nested guests it is used to store a pointer to a linked list of nested rmap entries which store the nested guest physical address which maps this guest address and for which there is a pte in the shadow page table. As there are currently two uses for the rmap array, and the potential for this to expand to more in the future, define a type field (being the top 8 bits of the rmap entry) to be used to define the type of the rmap entry which is currently present and define two values for this field for the two current uses of the rmap array. Since the nested case uses the rmap entry to store a pointer, define this type as having the two high bits set as is expected for a pointer. Define the hpt entry type as having bit 56 set (bit 7 IBM bit ordering). Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> |
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