Hi Luca, On 22/05/2024 09:51, Luca Fancellu wrote: > > > This commit implements the logic to have the static shared memory banks > from the Xen heap instead of having the host physical address passed from > the user. > > When the host physical address is not supplied, the physical memory is > taken from the Xen heap using allocate_domheap_memory, the allocation > needs to occur at the first handled DT node and the allocated banks > need to be saved somewhere. > > Introduce the 'shm_heap_banks' for that reason, a struct that will hold > the banks allocated from the heap, its field bank[].shmem_extra will be > used to point to the bootinfo shared memory banks .shmem_extra space, so > that there is not further allocation of memory and every bank in > shm_heap_banks can be safely identified by the shm_id to reconstruct its > traceability and if it was allocated or not. > > A search into 'shm_heap_banks' will reveal if the banks were allocated > or not, in case the host address is not passed, and the callback given > to allocate_domheap_memory will store the banks in the structure and > map them to the current domain, to do that, some changes to > acquire_shared_memory_bank are made to let it differentiate if the bank > is from the heap and if it is, then assign_pages is called for every > bank. > > When the bank is already allocated, for every bank allocated with the > corresponding shm_id, handle_shared_mem_bank is called and the mapping > are done. > > Signed-off-by: Luca Fancellu <[email protected]> Reviewed-by: Michal Orzel <[email protected]>
~Michal
