[Xen-changelog] [xen master] x86/time: scale host TSC in pvclock properly

[patchbot@xxxxxxx]

commit eab8a90be723d742d607aff2005ea0ab521bfd6a
Author:     Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
AuthorDate: Tue Jan 19 16:07:39 2016 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jan 19 16:07:39 2016 +0100

    x86/time: scale host TSC in pvclock properly
    
    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.zhang@xxxxxxxxx>
    Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 xen/arch/x86/time.c |   16 ++++++++++++----
 1 files 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;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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