KVM: Fix some obsolete comments

Remove some obsolete comments, fix wrong function name and description.
Reviewed-by: NVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: NMiaohe Lin <linmiaohe@huawei.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/nested.c

@@ -2960,7 +2960,7 @@ static int nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
 	/*
 	 * Induce a consistency check VMExit by clearing bit 1 in GUEST_RFLAGS,
 	 * which is reserved to '1' by hardware.  GUEST_RFLAGS is guaranteed to
-	 * be written (by preparve_vmcs02()) before the "real" VMEnter, i.e.
+	 * be written (by prepare_vmcs02()) before the "real" VMEnter, i.e.
 	 * there is no need to preserve other bits or save/restore the field.
 	 */
 	vmcs_writel(GUEST_RFLAGS, 0);
@@ -4382,7 +4382,7 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
  * Decode the memory-address operand of a vmx instruction, as recorded on an
  * exit caused by such an instruction (run by a guest hypervisor).
  * On success, returns 0. When the operand is invalid, returns 1 and throws
- * #UD or #GP.
+ * #UD, #GP, or #SS.
  */
 int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
 			u32 vmx_instruction_info, bool wr, int len, gva_t *ret)

arch/x86/kvm/vmx/vmx.c

@@ -808,7 +808,7 @@ void update_exception_bitmap(struct kvm_vcpu *vcpu)
 	if (to_vmx(vcpu)->rmode.vm86_active)
 		eb = ~0;
 	if (enable_ept)
-		eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
+		eb &= ~(1u << PF_VECTOR);
 
 	/* When we are running a nested L2 guest and L1 specified for it a
 	 * certain exception bitmap, we must trap the same exceptions and pass