[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v25 07/15] x86/VPMU: Save VPMU state for PV guests during context switch
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.ostrovsky@xxxxxxxxxx> --- Changes in v25: * Replaced is_hvm_vcpu with is_hvm_domain to be consistent with recent changes to context_switch() 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 b699f68..11197e4 100644 --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -1543,17 +1543,14 @@ void context_switch(struct vcpu *prev, struct vcpu *next) } if ( prev != next ) - _update_runstate_area(prev); - - if ( is_hvm_domain(prevd) ) { - if (prev != next) - vpmu_switch_from(prev); - - if ( !list_empty(&prev->arch.hvm_vcpu.tm_list) ) - pt_save_timer(prev); + _update_runstate_area(prev); + vpmu_switch_from(prev); } + if ( is_hvm_domain(prevd) && !list_empty(&prev->arch.hvm_vcpu.tm_list) ) + pt_save_timer(prev); + local_irq_disable(); set_current(next); @@ -1591,15 +1588,16 @@ void context_switch(struct vcpu *prev, struct vcpu *next) !is_hardware_domain(nextd)); } - if (is_hvm_domain(nextd) && (prev != next) ) - /* Must be done with interrupts enabled */ - vpmu_switch_to(next); - context_saved(prev); if ( prev != next ) + { _update_runstate_area(next); + /* Must be done with interrupts enabled */ + vpmu_switch_to(next); + } + /* Ensure that the vcpu has an up-to-date time base. */ update_vcpu_system_time(next); -- 1.8.1.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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