Add support for flushing PTEs on shared memory regions#30
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d-tatianin wants to merge 7 commits intomasterfrom
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Add support for flushing PTEs on shared memory regions#30d-tatianin wants to merge 7 commits intomasterfrom
d-tatianin wants to merge 7 commits intomasterfrom
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Even if all vrings are stopped we still want to perform a PTE flush if one was requested. Also get rid of a redundant 'any_started' boolean, which is already available as a 'num_vrings_in_flight' counter. Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
The generation counter allows to optimize the case of cloning a shared region by reusing an already existing mapping with a higher generation if one exists. Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Same as region_get_cached, but allows to specify whether the region's reference counter should be incremented. Will be used in the following commits. Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
This returns true if at least one region is shared between the provided memory maps. Will be used in the following commits. Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
This is the same as vhd_memmap_dup_remap, but becomes a no-op in case the provided memory map is already using the latest generation for all of its regions. Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Otherwise we might clear whatever new callback it decides to arm in the process. Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
This is implemented via a new type of internal vhost request that is sent to all disks sharing a mapping that is being flushed. Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
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