From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH 13/13] KVM: VMX: Ignore segment G and D bits when considering whether we can virtualize Date: Tue, 21 Aug 2012 17:07:10 +0300 Message-ID: <1345558030-29370-14-git-send-email-avi@redhat.com> References: <1345558030-29370-1-git-send-email-avi@redhat.com> Cc: kvm@vger.kernel.org To: Marcelo Tosatti Return-path: Received: from mx1.redhat.com ([209.132.183.28]:63782 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755069Ab2HUOIJ (ORCPT ); Tue, 21 Aug 2012 10:08:09 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q7LE89Yh014004 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Tue, 21 Aug 2012 10:08:09 -0400 In-Reply-To: <1345558030-29370-1-git-send-email-avi@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: We will enter the guest with G and D cleared; as real hardware ignores D in real mode, and G is taken care of by the limit test, we allow more code to run in vm86 mode. Signed-off-by: Avi Kivity --- arch/x86/kvm/vmx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 4649618..a35e05e 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3321,7 +3321,7 @@ static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg) return false; if (var.limit < 0xffff) return false; - if ((ar | (3 << AR_DPL_SHIFT)) != 0xf3) + if (((ar | (3 << AR_DPL_SHIFT)) & ~(AR_G_MASK | AR_DB_MASK)) != 0xf3) return false; return true; -- 1.7.11.3