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migration: support UFFD write fault processing in ram_save_iterate()

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In this particular implementation the same single migration
thread is responsible for both normal linear dirty page
migration and procesing UFFD page fault events.

Processing write faults includes reading UFFD file descriptor,
finding respective RAM block and saving faulting page to
the migration stream. After page has been saved, write protection
can be removed. Since asynchronous version of qemu_put_buffer()
is expected to be used to save pages, we also have to flush
migraion stream prior to un-protecting saved memory range.

Write protection is being removed for any previously protected
memory chunk that has hit the migration stream. That's valid
for pages from linear page scan along with write fault pages.

Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20210129101407.103458-4-andrey.gruzdev@virtuozzo.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  fixup pagefault.address cast for 32bit
This commit is contained in:
Andrey Gruzdev 2021-01-29 13:14:05 +03:00 • committed by Dr. David Alan Gilbert
parent 0e9b5cd6b2
commit 278e2f551a
4 changed files with 306 additions and 29 deletions
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7
include/exec/memory.h
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@ -150,6 +150,13 @@ typedef struct IOMMUTLBEvent {
#define RAM_PMEM (1 << 5)
/*
* UFFDIO_WRITEPROTECT is used on this RAMBlock to
* support 'write-tracking' migration type.
* Implies ram_state->ram_wt_enabled.
*/
#define RAM_UF_WRITEPROTECT (1 << 6)
static inline void iommu_notifier_init(IOMMUNotifier *n, IOMMUNotify fn,
IOMMUNotifierFlag flags,
hwaddr start, hwaddr end,