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postcopy: Check for shared memory

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Postcopy doesn't support migration of RAM shared with another process
yet (we've got a bunch of things to understand).
Check for the case and don't allow postcopy to be enabled.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2017-03-07 18:36:37 +00:00 committed by Juan Quintela
parent 463a4ac23b
commit 8679638b0e
1 changed files with 18 additions and 0 deletions
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18
migration/postcopy-ram.c
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@ -95,6 +95,19 @@ static bool ufd_version_check(int ufd)
return true;
}
/* Callback from postcopy_ram_supported_by_host block iterator.
*/
static int test_range_shared(const char *block_name, void *host_addr,
ram_addr_t offset, ram_addr_t length, void *opaque)
{
if (qemu_ram_is_shared(qemu_ram_block_by_name(block_name))) {
error_report("Postcopy on shared RAM (%s) is not yet supported",
block_name);
return 1;
}
return 0;
}
/*
* Note: This has the side effect of munlock'ing all of RAM, that's
* normally fine since if the postcopy succeeds it gets turned back on at the
@ -127,6 +140,11 @@ bool postcopy_ram_supported_by_host(void)
goto out;
}
/* We don't support postcopy with shared RAM yet */
if (qemu_ram_foreach_block(test_range_shared, NULL)) {
goto out;
}
/*
* userfault and mlock don't go together; we'll put it back later if
* it was enabled.