From d16c293e4ecbddedfc1d64095ce56f0569adc12b Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Fri, 21 Feb 2014 10:36:37 +0100 Subject: [PATCH] KVM: nVMX: Allow nested guests to run with dirty debug registers When preparing the VMCS02, the CPU-based execution controls is computed by vmx_exec_control. Turn off DR access exits there, too, if the KVM_DEBUGREG_WONT_EXIT bit is set in switch_db_regs. Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index a9940ec9e215..f4e5aeda5edf 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -4242,6 +4242,10 @@ static u32 vmx_pin_based_exec_ctrl(struct vcpu_vmx *vmx) static u32 vmx_exec_control(struct vcpu_vmx *vmx) { u32 exec_control = vmcs_config.cpu_based_exec_ctrl; + + if (vmx->vcpu.arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT) + exec_control &= ~CPU_BASED_MOV_DR_EXITING; + if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) { exec_control &= ~CPU_BASED_TPR_SHADOW; #ifdef CONFIG_X86_64 -- 2.20.1