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Mon, 4 Dec 2023 15:24:13 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A69262004E; Mon, 4 Dec 2023 15:24:13 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 29AA420049; Mon, 4 Dec 2023 15:24:13 +0000 (GMT) Received: from [9.171.80.190] (unknown [9.171.80.190]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 4 Dec 2023 15:24:13 +0000 (GMT) Message-ID: Date: Mon, 4 Dec 2023 16:24:12 +0100 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/4] KVM: s390: vsie: Fix STFLE interpretive execution identification Content-Language: en-US To: Nina Schoetterl-Glausch , Heiko Carstens , Alexander Gordeev , Christian Borntraeger , Vasily Gorbik , Claudio Imbrenda Cc: David Hildenbrand , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, Sven Schnelle , kvm@vger.kernel.org References: <20231108171229.3404476-1-nsg@linux.ibm.com> <20231108171229.3404476-2-nsg@linux.ibm.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 8c8wcITBf27--0EPFF8LokeEc-ANuiU5 X-Proofpoint-ORIG-GUID: Nb25759RPdJVGbzbIy3P1wSSum_CcujK X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-04_14,2023-12-04_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1011 priorityscore=1501 mlxscore=0 lowpriorityscore=0 phishscore=0 suspectscore=0 bulkscore=0 spamscore=0 adultscore=0 mlxlogscore=999 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2312040116 On 11/8/23 18:12, Nina Schoetterl-Glausch wrote: > STFLE can be interpretively executed. > This occurs when the facility list designation is unequal to zero. > Perform the check before applying the address mask instead of after. > > Fixes: 66b630d5b7f2 ("KVM: s390: vsie: support STFLE interpretation") > Reviewed-by: Claudio Imbrenda > Acked-by: David Hildenbrand > Signed-off-by: Nina Schoetterl-Glausch > --- > arch/s390/kvm/vsie.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c > index 61499293c2ac..d989772fe211 100644 > --- a/arch/s390/kvm/vsie.c > +++ b/arch/s390/kvm/vsie.c > @@ -988,9 +988,10 @@ static void retry_vsie_icpt(struct vsie_page *vsie_page) > static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) > { > struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; > - __u32 fac = READ_ONCE(vsie_page->scb_o->fac) & 0x7ffffff8U; > + __u32 fac = READ_ONCE(vsie_page->scb_o->fac); > > if (fac && test_kvm_facility(vcpu->kvm, 7)) { > + fac = fac & 0x7ffffff8U; Switch the retry and the facility assignment. Add the following comment: Facility list origin (FLO) is in bits 1 - 28 of the FLD so we need to mask here before reading. Apart from that this looks fine to me. > retry_vsie_icpt(vsie_page); > if (read_guest_real(vcpu, fac, &vsie_page->fac, > sizeof(vsie_page->fac)))