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Tue, 10 Sep 2019 14:25:03 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x8AENt39128686; Tue, 10 Sep 2019 14:25:02 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 2uxd6ch563-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 10 Sep 2019 14:25:02 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x8AEOwoJ025439; Tue, 10 Sep 2019 14:24:58 GMT Received: from char.us.oracle.com (/10.152.32.25) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 10 Sep 2019 07:24:58 -0700 Received: by char.us.oracle.com (Postfix, from userid 1000) id D9F686A010E; Tue, 10 Sep 2019 10:26:42 -0400 (EDT) Date: Tue, 10 Sep 2019 10:26:42 -0400 From: Konrad Rzeszutek Wilk To: Adalbert =?utf-8?B?TGF6xINy?= Cc: kvm@vger.kernel.org, linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= , Tamas K Lengyel , Mathieu Tarral , Samuel =?iso-8859-1?Q?Laur=E9n?= , Patrick Colp , Jan Kiszka , Stefan Hajnoczi , Weijiang Yang , Zhang@pps.reinject, Yu C , Mihai =?utf-8?B?RG9uyJt1?= Subject: Re: [RFC PATCH v6 69/92] kvm: x86: keep the page protected if tracked by the introspection tool Message-ID: <20190910142642.GC5879@char.us.oracle.com> References: <20190809160047.8319-1-alazar@bitdefender.com> <20190809160047.8319-70-alazar@bitdefender.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190809160047.8319-70-alazar@bitdefender.com> User-Agent: Mutt/1.9.1 (2017-09-22) Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9376 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909100140 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9376 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909100140 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Aug 09, 2019 at 07:00:24PM +0300, Adalbert Laz=C4=83r wrote: > This patch might be obsolete thanks to single-stepping. sooo should it be skipped from this large patchset to easy review? >=20 > Signed-off-by: Adalbert Laz=C4=83r > --- > arch/x86/kvm/x86.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) >=20 > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 2c06de73a784..06f44ce8ed07 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -6311,7 +6311,8 @@ static bool reexecute_instruction(struct kvm_vcpu= *vcpu, gva_t cr2, > indirect_shadow_pages =3D vcpu->kvm->arch.indirect_shadow_pages; > spin_unlock(&vcpu->kvm->mmu_lock); > =20 > - if (indirect_shadow_pages) > + if (indirect_shadow_pages > + && !kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) > kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > =20 > return true; > @@ -6322,7 +6323,8 @@ static bool reexecute_instruction(struct kvm_vcpu= *vcpu, gva_t cr2, > * and it failed try to unshadow page and re-enter the > * guest to let CPU execute the instruction. > */ > - kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > + if (!kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) > + kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > =20 > /* > * If the access faults on its page table, it can not > @@ -6374,6 +6376,9 @@ static bool retry_instruction(struct x86_emulate_= ctxt *ctxt, > if (!vcpu->arch.mmu->direct_map) > gpa =3D kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); > =20 > + if (kvmi_tracked_gfn(vcpu, gpa_to_gfn(gpa))) > + return false; > + > kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); > =20 > return true;