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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2008-06-06 19:37:35 (GMT) |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-06-24 09:16:52 (GMT) |
| commit | d4acf7e7abe45457e751525a2a4d5b693dfdd597 (patch) | |
| tree | 2ff1cf6f59b0591ea39c0457705188d5f46cb118 /Documentation/pi-futex.txt | |
| parent | 62786b9e81a2dbe9c073a2ade52d33a2627d6d85 (diff) | |
| download | linux-d4acf7e7abe45457e751525a2a4d5b693dfdd597.tar.xz | |
KVM: Fix race between timer migration and vcpu migration
A guest vcpu instance can be scheduled to a different physical CPU
between the test for KVM_REQ_MIGRATE_TIMER and local_irq_disable().
If that happens, the timer will only be migrated to the current pCPU on
the next exit, meaning that guest LAPIC timer event can be delayed until
a host interrupt is triggered.
Fix it by cancelling guest entry if any vcpu request is pending. This
has the side effect of nicely consolidating vcpu->requests checks.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'Documentation/pi-futex.txt')
0 files changed, 0 insertions, 0 deletions