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postcopy: helper for waking shared

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Provide a helper to send a 'wake' request on a userfaultfd for
a shared process.
The address in the clients address space is specified together
with the RAMBlock it was resolved to.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-03-12 17:21:14 +00:00 • committed by Michael S. Tsirkin
parent 375318d03f
commit 5efc356403
3 changed files with 37 additions and 0 deletions
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10
migration/postcopy-ram.h
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@ -164,6 +164,16 @@ struct PostCopyFD {
*/
void postcopy_register_shared_ufd(struct PostCopyFD *pcfd);
void postcopy_unregister_shared_ufd(struct PostCopyFD *pcfd);
/* postcopy_wake_shared: Notify a client ufd that a page is available
*
* Returns 0 on success
*
* @pcfd: Structure with fd, handler and name as above
* @client_addr: Address in the client program, not QEMU
* @rb: The RAMBlock the page is in
*/
int postcopy_wake_shared(struct PostCopyFD *pcfd, uint64_t client_addr,
RAMBlock *rb);
/* Callback from shared fault handlers to ask for a page */
int postcopy_request_shared_page(struct PostCopyFD *pcfd, RAMBlock *rb,
uint64_t client_addr, uint64_t offset);