From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: [PATCH] KVM: when entering real mode aling segment base to 16 bytes Date: Mon, 27 Dec 2010 14:58:41 +0200 Message-ID: <20101227125841.GJ2231@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org To: avi.marcelo@redhat.com Return-path: Received: from mx1.redhat.com ([209.132.183.28]:51249 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753689Ab0L0M6n (ORCPT ); Mon, 27 Dec 2010 07:58:43 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id oBRCwgX9005130 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 27 Dec 2010 07:58:43 -0500 Content-Disposition: inline Sender: kvm-owner@vger.kernel.org List-ID: VMX checks that base is equal segment shifted 4 bites left. Otherwise guest entry fails. Signed-off-by: Gleb Natapov diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 2260783..45014ba 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1736,7 +1736,7 @@ static void fix_rmode_seg(int seg, struct kvm_save_segment *save) save->limit = vmcs_read32(sf->limit); save->ar = vmcs_read32(sf->ar_bytes); vmcs_write16(sf->selector, save->base >> 4); - vmcs_write32(sf->base, save->base & 0xfffff); + vmcs_write32(sf->base, save->base & 0xffff0); vmcs_write32(sf->limit, 0xffff); vmcs_write32(sf->ar_bytes, 0xf3); } -- Gleb.