diff options
| author | Vincent Donnefort <vdonnefort@google.com> | 2026-10-08 11:42:11 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2026-10-10 10:46:44 +0100 |
| commit | 6164ce3491bcc3a27a2e2e9260a286eb2df2301e (patch) | |
| tree | 3545ef81257fa47e8591124042e4a480842a6ecf /tools/perf/scripts/python | |
| parent | 6b1abd43b27a5ecac0672482dc8ca1e48c2c8d15 (diff) | |
KVM: arm64: Prevent 64-bit overflow when computing hyp clock rate
The hypervisor clock rate is delta_cycles * NSEC_PER_SEC / delta_boot.
It is computed whenever a deviation occurs. If the delta between two
rate updates is big enough, delta_cycles * NSEC_PER_SEC will overflow.
Prevent overflow with mul_u64_u64_div_u64(). And as a bonus, simplify
the clock estimation with mul_u64_u32_shr().
Fixes: b22888917fa4 ("KVM: arm64: Sync boot clock with the nVHE/pKVM hyp")
Cc: stable@vger.kernel.org
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
Tested-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20261008104212.3134550-2-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions