[Xen-devel] [PATCH 06/13] x86/hvm: Scale host TSC when setting/getting guest TSC

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

The existing hvm_set_guest_tsc_fixed() and hvm_get_guest_tsc_fixed()
calculate the guest TSC by adding the TSC offset to the host TSC. When
the TSC scaling is enabled, the host TSC should be scaled first. This
patch adds the scaling logic to those two functions.

Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 2d55a36..568c9ef 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -388,13 +388,12 @@ void hvm_set_guest_tsc_fixed(struct vcpu *v, u64 
guest_tsc, u64 at_tsc)
         tsc = hvm_get_guest_time_fixed(v, at_tsc);
         tsc = gtime_to_gtsc(v->domain, tsc);
     }
-    else if ( at_tsc )
-    {
-        tsc = at_tsc;
-    }
     else
     {
-        tsc = rdtsc();
+        tsc = at_tsc ? at_tsc : rdtsc();
+
+        if ( hvm_funcs.tsc_scaling_supported )
+            tsc = hvm_scale_tsc(v, tsc);
     }
 
     delta_tsc = guest_tsc - tsc;
@@ -422,13 +421,12 @@ u64 hvm_get_guest_tsc_fixed(struct vcpu *v, uint64_t 
at_tsc)
         tsc = hvm_get_guest_time_fixed(v, at_tsc);
         tsc = gtime_to_gtsc(v->domain, tsc);
     }
-    else if ( at_tsc )
-    {
-        tsc = at_tsc;
-    }
     else
     {
-        tsc = rdtsc();
+        tsc = at_tsc ? at_tsc : rdtsc();
+
+        if ( hvm_funcs.tsc_scaling_supported )
+            tsc = hvm_scale_tsc(v, tsc);
     }
 
     return tsc + v->arch.hvm_vcpu.cache_tsc_offset;
-- 
2.4.8


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