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| author | Ben Gardon <bgardon@google.com> | 2021-02-02 10:57:28 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-04 05:27:45 -0500 |
| commit | e25f0e0cd51bfb1e2e6121373c68f1427266bba7 (patch) | |
| tree | 8ca21c3c2bd264f5586a630f654c8fe5cdfc5ec8 /mm/fadvise.c | |
| parent | 08f07c800e9d35b59d0c8346333f189160bd67d4 (diff) | |
| download | linux-e25f0e0cd51bfb1e2e6121373c68f1427266bba7.tar.bz2 | |
KVM: x86/mmu: Mark SPTEs in disconnected pages as removed
When clearing TDP MMU pages what have been disconnected from the paging
structure root, set the SPTEs to a special non-present value which will
not be overwritten by other threads. This is needed to prevent races in
which a thread is clearing a disconnected page table, but another thread
has already acquired a pointer to that memory and installs a mapping in
an already cleared entry. This can lead to memory leaks and accounting
errors.
Reviewed-by: Peter Feiner <pfeiner@google.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210202185734.1680553-23-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'mm/fadvise.c')
0 files changed, 0 insertions, 0 deletions