xen/x86: Do not call xen_init_time_ops() until shared_info is initialized

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Routines that are set by xen_init_time_ops() use shared_info's
pvclock_vcpu_time_info area. This area is not properly available until
shared_info is mapped in xen_setup_shared_info().

This became especially problematic due to commit dd759d93f4 ("x86/timers:
Add simple udelay calibration") where we end up reading tsc_to_system_mul
from xen_dummy_shared_info (i.e. getting zero value) and then trying
to divide by it in pvclock_tsc_khz().

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

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Boris Ostrovsky 2017-05-03 16:20:51 -04:00 • committed by Juergen Gross

parent 40f4ac0b51

commit d162809f85

2 changed files with 8 additions and 3 deletions

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9

arch/x86/xen/enlighten_pv.c

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2

arch/x86/xen/time.c

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