diff options
| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-01-08 12:24:48 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-01-27 20:00:09 +0100 |
| commit | e851265a816f96a86c5a0316d2fc4d45be76d1d4 (patch) | |
| tree | 21bb77c2d610b96dbab00c0ca85e4a452cf6c787 /scripts/bpf_helpers_doc.py | |
| parent | 2c0629f4b95cf5adf5b6f78f7d318df894b5f9a1 (diff) | |
KVM: x86/mmu: Use huge pages for DAX-backed files
Walk the host page tables to identify hugepage mappings for ZONE_DEVICE
pfns, i.e. DAX pages. Explicitly query kvm_is_zone_device_pfn() when
deciding whether or not to bother walking the host page tables, as DAX
pages do not set up the head/tail infrastructure, i.e. will return false
for PageCompound() even when using huge pages.
Zap ZONE_DEVICE sptes when disabling dirty logging, e.g. if live
migration fails, to allow KVM to rebuild large pages for DAX-based
mappings. Presumably DAX favors large pages, and worst case scenario is
a minor performance hit as KVM will need to re-fault all DAX-based
pages.
Suggested-by: Barret Rhoden <brho@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Jason Zeng <jason.zeng@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Liran Alon <liran.alon@oracle.com>
Cc: linux-nvdimm <linux-nvdimm@lists.01.org>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'scripts/bpf_helpers_doc.py')
0 files changed, 0 insertions, 0 deletions