diff options
| author | Oliver Upton <[email protected]> | 2021-09-16 18:15:35 +0000 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2021-10-18 14:43:44 -0400 |
| commit | c68dc1b577eabd5605c6c7c08f3e07ae18d30d5d (patch) | |
| tree | e7d06e5afc7e9eda6259256c18da24fe42c9a327 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | 3d5e7a28b1ea2d603dea478e58e37ce75b9597ab (diff) | |
KVM: x86: Report host tsc and realtime values in KVM_GET_CLOCK
Handling the migration of TSCs correctly is difficult, in part because
Linux does not provide userspace with the ability to retrieve a (TSC,
realtime) clock pair for a single instant in time. In lieu of a more
convenient facility, KVM can report similar information in the kvm_clock
structure.
Provide userspace with a host TSC & realtime pair iff the realtime clock
is based on the TSC. If userspace provides KVM_SET_CLOCK with a valid
realtime value, advance the KVM clock by the amount of elapsed time. Do
not step the KVM clock backwards, though, as it is a monotonic
oscillator.
Suggested-by: Paolo Bonzini <[email protected]>
Signed-off-by: Oliver Upton <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions