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postcopy: Check for userfault+hugepage feature

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We need extra Linux kernel support (~4.11) to support userfaults
on hugetlbfs; check for them.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20170224182844.32452-15-dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2017-02-24 18:28:42 +00:00
parent 61a502128b
commit 7e8cafb713
1 changed files with 11 additions and 1 deletions
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12
migration/postcopy-ram.c
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@ -81,6 +81,17 @@ static bool ufd_version_check(int ufd)
return false;
}
if (getpagesize() != ram_pagesize_summary()) {
bool have_hp = false;
/* We've got a huge page */
#ifdef UFFD_FEATURE_MISSING_HUGETLBFS
have_hp = api_struct.features & UFFD_FEATURE_MISSING_HUGETLBFS;
#endif
if (!have_hp) {
error_report("Userfault on this host does not support huge pages");
return false;
}
}
return true;
}
@ -115,7 +126,6 @@ bool postcopy_ram_supported_by_host(void)
if (!ufd_version_check(ufd)) {
goto out;
}
/* TODO: Only allow huge pages if the kernel supports it */
/*
* userfault and mlock don't go together; we'll put it back later if