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author | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 01:29:03 (GMT) |
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committer | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 01:29:15 (GMT) |
commit | b48aa97e38206a84bf8485e7c553412274708ce5 (patch) | |
tree | 360f44bce8cf39836e916f3b5ed5c2e8849cd263 /arch/.gitignore | |
parent | 42897d866b120547777ae1fd316680ec53356d9c (diff) | |
download | linux-fsl-qoriq-b48aa97e38206a84bf8485e7c553412274708ce5.tar.xz |
KVM: x86: require matched TSC offsets for master clock
With master clock, a pvclock clock read calculates:
ret = system_timestamp + [ (rdtsc + tsc_offset) - tsc_timestamp ]
Where 'rdtsc' is the host TSC.
system_timestamp and tsc_timestamp are unique, one tuple
per VM: the "master clock".
Given a host with synchronized TSCs, its obvious that
guest TSC must be matched for the above to guarantee monotonicity.
Allow master clock usage only if guest TSCs are synchronized.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/.gitignore')
0 files changed, 0 insertions, 0 deletions