mirror of
https://github.com/torvalds/linux
synced 2024-10-03 18:00:50 +00:00
c09d65d9ea
If guest sets MSR_IA32_TSCDEADLINE to value such that in host time-domain it's shorter than lapic_timer_advance_ns, we can reach a case that we call hrtimer_start() with expiration time set at the past. Because lapic_timer.timer is init with HRTIMER_MODE_ABS_PINNED, it is not allowed to run in softirq and therefore will never expire. To avoid such a scenario, verify that deadline expiration time is set on host time-domain further than (now + lapic_timer_advance_ns). A future patch can also consider adding a min_timer_deadline_ns module parameter, similar to min_timer_period_us to avoid races that amount of ns it takes to run logic could still call hrtimer_start() with expiration timer set at the past. Reviewed-by: Joao Martins <joao.m.martins@oracle.com> Signed-off-by: Liran Alon <liran.alon@oracle.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
||
|---|---|---|
| .. | ||
| boot | ||
| configs | ||
| crypto | ||
| entry | ||
| events | ||
| hyperv | ||
| ia32 | ||
| include | ||
| kernel | ||
| kvm | ||
| lib | ||
| math-emu | ||
| mm | ||
| net | ||
| oprofile | ||
| pci | ||
| platform | ||
| power | ||
| purgatory | ||
| ras | ||
| realmode | ||
| tools | ||
| um | ||
| video | ||
| xen | ||
| .gitignore | ||
| Kbuild | ||
| Kconfig | ||
| Kconfig.cpu | ||
| Kconfig.debug | ||
| Makefile | ||
| Makefile.um | ||
| Makefile_32.cpu | ||