This patch makes the pvclock return the scaled host TSC and
corresponding scaling parameters to HVM domains if guest TSC is not
emulated and TSC scaling is enabled.
Signed-off-by: Haozhong Zhang <haozhong.zh...@intel.com>
Reviewed-by: Boris Ostrovsky <boris.ostrov...@oracle.com>
---
Changes in v4:
(addressing Jan Beulich's comments)
* Remove unnecessary cast (u8) in __update_vcpu_system_time().
xen/arch/x86/time.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index ec3f33e..988403a 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -815,10 +815,18 @@ static void __update_vcpu_system_time(struct vcpu *v, int
force)
}
else
{
- tsc_stamp = t->local_tsc_stamp;
-
- _u.tsc_to_system_mul = t->tsc_scale.mul_frac;
- _u.tsc_shift = (s8)t->tsc_scale.shift;
+ if ( has_hvm_container_domain(d) && cpu_has_tsc_ratio )
+ {
+ tsc_stamp = hvm_funcs.scale_tsc(v, t->local_tsc_stamp);
+ _u.tsc_to_system_mul = d->arch.vtsc_to_ns.mul_frac;
+ _u.tsc_shift = d->arch.vtsc_to_ns.shift;
+ }
+ else
+ {
+ tsc_stamp = t->local_tsc_stamp;
+ _u.tsc_to_system_mul = t->tsc_scale.mul_frac;
+ _u.tsc_shift = t->tsc_scale.shift;
+ }
}
_u.tsc_timestamp = tsc_stamp;
--
2.7.0
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