From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757341AbXL3HOq (ORCPT ); Sun, 30 Dec 2007 02:14:46 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756275AbXL3HK7 (ORCPT ); Sun, 30 Dec 2007 02:10:59 -0500 Received: from il.qumranet.com ([82.166.9.18]:59478 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752952AbXL3HKp (ORCPT ); Sun, 30 Dec 2007 02:10:45 -0500 From: Avi Kivity To: linux-kernel@vger.kernel.org, kvm-devel@lists.sourceforge.net Cc: Jan Kiszka Subject: [PATCH 17/52] KVM: VMX: Force seg.base == (seg.sel << 4) in real mode Date: Sun, 30 Dec 2007 09:10:03 +0200 Message-Id: <1198998638-22713-18-git-send-email-avi@qumranet.com> X-Mailer: git-send-email 1.5.3.7 In-Reply-To: <1198998638-22713-1-git-send-email-avi@qumranet.com> References: <1198998638-22713-1-git-send-email-avi@qumranet.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jan Kiszka Ensure that segment.base == segment.selector << 4 when entering the real mode on Intel so that the CPU will not bark at us. This fixes some old protected mode demo from http://www.x86.org/articles/pmbasics/tspec_a1_doc.htm. Signed-off-by: Jan Kiszka Signed-off-by: Avi Kivity --- drivers/kvm/vmx.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index c23f399..fbe792d 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -1165,7 +1165,8 @@ static void fix_rmode_seg(int seg, struct kvm_save_segment *save) save->base = vmcs_readl(sf->base); save->limit = vmcs_read32(sf->limit); save->ar = vmcs_read32(sf->ar_bytes); - vmcs_write16(sf->selector, vmcs_readl(sf->base) >> 4); + vmcs_write16(sf->selector, save->base >> 4); + vmcs_write32(sf->base, save->base & 0xfffff); vmcs_write32(sf->limit, 0xffff); vmcs_write32(sf->ar_bytes, 0xf3); } -- 1.5.3.7