From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755873Ab0BJRXW (ORCPT ); Wed, 10 Feb 2010 12:23:22 -0500 Received: from mx1.redhat.com ([209.132.183.28]:13200 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755233Ab0BJRXL (ORCPT ); Wed, 10 Feb 2010 12:23:11 -0500 From: Avi Kivity To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH 02/40] KVM: x86: raise TSS exception for NULL CS and SS segments Date: Wed, 10 Feb 2010 19:22:31 +0200 Message-Id: <1265822589-11155-3-git-send-email-avi@redhat.com> In-Reply-To: <1265822589-11155-1-git-send-email-avi@redhat.com> References: <1265822589-11155-1-git-send-email-avi@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marcelo Tosatti Windows 2003 uses task switch to triple fault and reboot (the other exception being reserved pdptrs bits). Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/x86.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index b503614..47fab87 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4411,6 +4411,15 @@ static int is_vm86_segment(struct kvm_vcpu *vcpu, int seg) (kvm_get_rflags(vcpu) & X86_EFLAGS_VM); } +static void kvm_check_segment_descriptor(struct kvm_vcpu *vcpu, int seg, + u16 selector) +{ + /* NULL selector is not valid for CS and SS */ + if (seg == VCPU_SREG_CS || seg == VCPU_SREG_SS) + if (!selector) + kvm_queue_exception_e(vcpu, TS_VECTOR, selector >> 3); +} + int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int type_bits, int seg) { @@ -4420,6 +4429,8 @@ int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, return kvm_load_realmode_segment(vcpu, selector, seg); if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg)) return 1; + + kvm_check_segment_descriptor(vcpu, seg, selector); kvm_seg.type |= type_bits; if (seg != VCPU_SREG_SS && seg != VCPU_SREG_CS && -- 1.6.5.3