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migration: introduce UFFD-WP low-level interface helpers

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Glue code to the userfaultfd kernel implementation.
Querying feature support, createing file descriptor, feature control,
memory region registration, IOCTLs on registered registered regions.

Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210129101407.103458-3-andrey.gruzdev@virtuozzo.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  Fixed up range.start casting for 32bit
This commit is contained in:
Andrey Gruzdev 2021-01-29 13:14:04 +03:00 • committed by Dr. David Alan Gilbert
parent 6e8c25b4c6
commit 0e9b5cd6b2
5 changed files with 391 additions and 0 deletions
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1
include/exec/memory.h
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@ -149,6 +149,7 @@ typedef struct IOMMUTLBEvent {
/* RAM is a persistent kind memory */
#define RAM_PMEM (1 << 5)
static inline void iommu_notifier_init(IOMMUNotifier *n, IOMMUNotify fn,
IOMMUNotifierFlag flags,
hwaddr start, hwaddr end,