From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: Re: [PATCH] KVM: VMX: use vmcs_clear/set_bits for debug register exits Date: Fri, 26 Feb 2016 20:04:16 +0800 Message-ID: <56D03F40.40200@linux.intel.com> References: <1456487744-11905-1-git-send-email-pbonzini@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit To: Paolo Bonzini , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Return-path: In-Reply-To: <1456487744-11905-1-git-send-email-pbonzini@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 02/26/2016 07:55 PM, Paolo Bonzini wrote: > Signed-off-by: Paolo Bonzini > --- > arch/x86/kvm/vmx.c | 14 +++----------- > 1 file changed, 3 insertions(+), 11 deletions(-) > > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c > index aa16d5874fe6..46154dac71e6 100644 > --- a/arch/x86/kvm/vmx.c > +++ b/arch/x86/kvm/vmx.c > @@ -5619,11 +5619,8 @@ static int handle_dr(struct kvm_vcpu *vcpu) > } > > if (vcpu->guest_debug == 0) { > - u32 cpu_based_vm_exec_control; > - > - cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); > - cpu_based_vm_exec_control &= ~CPU_BASED_MOV_DR_EXITING; > - vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); > + vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL, > + CPU_BASED_MOV_DR_EXITING); > > /* > * No more DR vmexits; force a reload of the debug registers > @@ -5660,8 +5657,6 @@ static void vmx_set_dr6(struct kvm_vcpu *vcpu, unsigned long val) > > static void vmx_sync_dirty_debug_regs(struct kvm_vcpu *vcpu) > { > - u32 cpu_based_vm_exec_control; > - > get_debugreg(vcpu->arch.db[0], 0); > get_debugreg(vcpu->arch.db[1], 1); > get_debugreg(vcpu->arch.db[2], 2); > @@ -5670,10 +5665,7 @@ static void vmx_sync_dirty_debug_regs(struct kvm_vcpu *vcpu) > vcpu->arch.dr7 = vmcs_readl(GUEST_DR7); > > vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT; > - > - cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL); > - cpu_based_vm_exec_control |= CPU_BASED_MOV_DR_EXITING; > - vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control); > + vmcs_set_bits(CPU_BASED_VM_EXEC_CONTROL, CPU_BASED_MOV_DR_EXITING); > } > > static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val) > Reviewed-by: Xiao Guangrong