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[Xen-devel] [PATCH v3 14/16] x86/VPMU: Save VPMU state for PV guests during context switch



Save VPMU state during context switch for both HVM and PV guests unless we
are in PMU privileged mode (i.e. dom0 is doing all profiling).

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 xen/arch/x86/domain.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 25572d5..daf0313 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1444,17 +1444,15 @@ void context_switch(struct vcpu *prev, struct vcpu 
*next)
     }
 
     if (prev != next)
-        update_runstate_area(prev);
-
-    if ( is_hvm_vcpu(prev) )
     {
-        if (prev != next)
+        update_runstate_area(prev);
+        if ( !(vpmu_mode & XENPMU_MODE_PRIV) || prev->domain != dom0 )
             vpmu_save(prev);
-
-        if ( !list_empty(&prev->arch.hvm_vcpu.tm_list) )
-            pt_save_timer(prev);
     }
 
+    if ( is_hvm_vcpu(prev) && !list_empty(&prev->arch.hvm_vcpu.tm_list) )
+        pt_save_timer(prev);
+
     local_irq_disable();
 
     set_current(next);
@@ -1491,7 +1489,7 @@ void context_switch(struct vcpu *prev, struct vcpu *next)
                            (next->domain->domain_id != 0));
     }
 
-    if (is_hvm_vcpu(next) && (prev != next) )
+    if ( prev != next && !(vpmu_mode & XENPMU_MODE_PRIV) )
         /* Must be done with interrupts enabled */
         vpmu_load(next);
 
-- 
1.8.1.4


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