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| author | Oliver Upton <oliver.upton@linux.dev> | 2022-11-07 21:56:39 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-11-10 14:43:46 +0000 |
| commit | ca5de2448c3b4c018fe3d6223df8b59068be1cd7 (patch) | |
| tree | a65155d363a6324551eeaa21bf33d78f2261bf9b /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | c3119ae45dfb6038ca458ab5ba7a9fba2810845b (diff) | |
| download | linux-ca5de2448c3b4c018fe3d6223df8b59068be1cd7.tar.gz linux-ca5de2448c3b4c018fe3d6223df8b59068be1cd7.tar.bz2 linux-ca5de2448c3b4c018fe3d6223df8b59068be1cd7.zip | |
KVM: arm64: Atomically update stage 2 leaf attributes in parallel walks
The stage2 attr walker is already used for parallel walks. Since commit
f783ef1c0e82 ("KVM: arm64: Add fast path to handle permission relaxation
during dirty logging"), KVM acquires the read lock when
write-unprotecting a PTE. However, the walker only uses a simple store
to update the PTE. This is safe as the only possible race is with
hardware updates to the access flag, which is benign.
However, a subsequent change to KVM will allow more changes to the stage
2 page tables to be done in parallel. Prepare the stage 2 attribute
walker by performing atomic updates to the PTE when walking in parallel.
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221107215644.1895162-10-oliver.upton@linux.dev
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions