From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yang Zhang Subject: [PATCH] VMX, apicv: add boot parameter to enable/disable APIC-v dynamically Date: Fri, 9 Aug 2013 17:01:26 +0800 Message-ID: <1376038886-18645-1-git-send-email-yang.z.zhang@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xensource.com Cc: Yang Zhang , JBeulich@suse.com List-Id: xen-devel@lists.xenproject.org From: Yang Zhang 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 --- xen/arch/x86/hvm/vmx/vmcs.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c index de9f592..b52408d 100644 --- 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); -- 1.7.1