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 <pbonzini@redhat.com>

parent 81908bf4

arch/x86/kvm/vmx.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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