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[Xen-devel] [PATCH v6 16/19] 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>
Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Reviewed-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
Tested-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
---
 xen/arch/x86/domain.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 4a122da..a853071 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1478,16 +1478,14 @@ void context_switch(struct vcpu *prev, struct vcpu 
*next)
     }
 
     if ( prev != next )
-        _update_runstate_area(prev);
-
-    if ( is_hvm_vcpu(prev) )
     {
-        if ( (prev != next) && (vpmu_mode & XENPMU_MODE_ON) )
+        _update_runstate_area(prev);
+        if ( vpmu_mode & XENPMU_MODE_ON )
             vpmu_save(prev);
+    }
 
-        if ( !list_empty(&prev->arch.hvm_vcpu.tm_list) )
+    if ( is_hvm_vcpu(prev) &&  !list_empty(&prev->arch.hvm_vcpu.tm_list) )
             pt_save_timer(prev);
-    }
 
     local_irq_disable();
 
@@ -1526,7 +1524,7 @@ void context_switch(struct vcpu *prev, struct vcpu *next)
                            !is_hardware_domain(next->domain));
     }
 
-    if ( is_hvm_vcpu(next) && (prev != next) && (vpmu_mode & XENPMU_MODE_ON) )
+    if ( (prev != next) && (vpmu_mode & XENPMU_MODE_ON) )
         /* Must be done with interrupts enabled */
         vpmu_load(next);
 
-- 
1.8.1.4


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