Save VPMU state during context switch for both HVM and PV(H) guests.
A subsequent patch ("x86/VPMU: NMI-based VPMU support") will make it possible
for vpmu_switch_to() to call vmx_vmcs_try_enter()->vcpu_pause() which needs
is_running to be correctly set/cleared. To prepare for that, call
context_saved()
before vpmu_switch_to() is executed. (Note that while this change could have
been dalayed until that later patch, the changes are harmless to existing code
and so we do it here)
Signed-off-by: Boris Ostrovsky <boris.ostrov...@oracle.com>
Acked-by: Jan Beulich <jbeul...@suse.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Reviewed-by: Dietmar Hahn <dietmar.h...@ts.fujitsu.com>
Tested-by: Dietmar Hahn <dietmar.h...@ts.fujitsu.com>
---
xen/arch/x86/domain.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 838bbb7..5e33277 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1533,17 +1533,14 @@ 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_switch_from(vcpu_vpmu(prev), vcpu_vpmu(next));
-
- if ( !list_empty(&prev->arch.hvm_vcpu.tm_list) )
- pt_save_timer(prev);
+ _update_runstate_area(prev);
+ vpmu_switch_from(vcpu_vpmu(prev), vcpu_vpmu(next));
}
+ if ( is_hvm_vcpu(prev) && !list_empty(&prev->arch.hvm_vcpu.tm_list) )
+ pt_save_timer(prev);
+
local_irq_disable();
set_current(next);
@@ -1581,15 +1578,16 @@ void context_switch(struct vcpu *prev, struct vcpu
*next)
!is_hardware_domain(next->domain));
}
- if ( is_hvm_vcpu(next) && (prev != next) )
- /* Must be done with interrupts enabled */
- vpmu_switch_to(vcpu_vpmu(prev), vcpu_vpmu(next));
-
context_saved(prev);
if ( prev != next )
+ {
_update_runstate_area(next);
+ /* Must be done with interrupts enabled */
+ vpmu_switch_to(vcpu_vpmu(prev), vcpu_vpmu(next));
+ }
+
/* Ensure that the vcpu has an up-to-date time base. */
update_vcpu_system_time(next);
--
1.8.1.4
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