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| author | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2017-02-24 18:28:42 +0000 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2017-02-28 11:30:24 +0000 |
| commit | 7e8cafb7137502ce006cc48d0265f89399e0cb33 (patch) | |
| tree | fafbd64bbe29329ad0246098fd893411ce653cec /migration/postcopy-ram.c | |
| parent | 61a502128bc81df154ecaa7d42dc075832b169e8 (diff) | |
| download | qemu-7e8cafb7137502ce006cc48d0265f89399e0cb33.tar.gz | |
postcopy: Check for userfault+hugepage feature
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>
Diffstat (limited to 'migration/postcopy-ram.c')
| -rw-r--r-- | migration/postcopy-ram.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index 6b30b43d51..102fb61485 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -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 |