[Xen-devel] [PATCH v6 16/19] x86/VPMU: Save VPMU state for PV guests during context switch

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

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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