# Commit 0c006b41a283a0a569c863d44abde5aa5750ae01 # Date 2013-08-13 17:47:16 +0200 # Author Yang Zhang # Committer Jan Beulich VMX: add boot parameter to enable/disable APIC-v dynamically Add a boot parameter to enable/disable the APIC-v dynamically. APIC-v is enabled by default. User can use apicv=0 to disable it. Signed-off-by: Yang Zhang --- a/xen/arch/x86/hvm/vmx/vmcs.c +++ b/xen/arch/x86/hvm/vmx/vmcs.c @@ -46,6 +46,9 @@ boolean_param("vpid", opt_vpid_enabled); static bool_t __read_mostly opt_unrestricted_guest_enabled = 1; boolean_param("unrestricted_guest", opt_unrestricted_guest_enabled); +static bool_t __read_mostly opt_apicv_enabled = 1; +boolean_param("apicv", opt_apicv_enabled); + /* * These two parameters are used to config the controls for Pause-Loop Exiting: * ple_gap: upper bound on the amount of time between two successive @@ -196,12 +199,12 @@ static int vmx_init_vmcs_config(void) * "APIC Register Virtualization" and "Virtual Interrupt Delivery" * can be set only when "use TPR shadow" is set */ - if ( _vmx_cpu_based_exec_control & CPU_BASED_TPR_SHADOW ) + if ( (_vmx_cpu_based_exec_control & CPU_BASED_TPR_SHADOW) && + opt_apicv_enabled ) opt |= SECONDARY_EXEC_APIC_REGISTER_VIRT | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE; - _vmx_secondary_exec_control = adjust_vmx_controls( "Secondary Exec Control", min, opt, MSR_IA32_VMX_PROCBASED_CTLS2, &mismatch);