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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 18 Feb 2020 10:05:48 -0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 01IA5iHT43778128 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 18 Feb 2020 10:05:44 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B58BD42042; Tue, 18 Feb 2020 10:05:44 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2744242047; Tue, 18 Feb 2020 10:05:44 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.58.100]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 18 Feb 2020 10:05:44 +0000 (GMT) Subject: Re: [PATCH v2 33/42] KVM: s390: protvirt: Mask PSW interrupt bits for interception 104 and 112 To: David Hildenbrand , Janosch Frank Cc: KVM , Cornelia Huck , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , linux-s390 , Michael Mueller , Vasily Gorbik , Janosch Frank References: <20200214222658.12946-1-borntraeger@de.ibm.com> <20200214222658.12946-34-borntraeger@de.ibm.com> <70f30f71-f7f2-8286-aafb-ea5ca5fb86e9@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <70f30f71-f7f2-8286-aafb-ea5ca5fb86e9@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20021810-0016-0000-0000-000002E7E428 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20021810-0017-0000-0000-0000334AF74F Message-Id: <6206d179-f9c4-be76-25cd-0cd9cefa2c2c@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-18_02:2020-02-17,2020-02-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 mlxlogscore=999 suspectscore=0 adultscore=0 bulkscore=0 impostorscore=0 clxscore=1015 spamscore=0 priorityscore=1501 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002180080 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 18.02.20 10:53, David Hildenbrand wrote: > On 14.02.20 23:26, Christian Borntraeger wrote: >> From: Janosch Frank >> >> We're not allowed to inject interrupts on intercepts that leave the >> guest state in an "in-between" state where the next SIE entry will do a >> continuation, namely secure instruction interception (104) and secure >> prefix interception (112). >> As our PSW is just a copy of the real one that will be replaced on the >> next exit, we can mask out the interrupt bits in the PSW to make sure >> that we do not inject anything. >> >> Signed-off-by: Janosch Frank >> Reviewed-by: Thomas Huth >> Reviewed-by: Cornelia Huck >> [borntraeger@de.ibm.com: patch merging, splitting, fixing] >> Signed-off-by: Christian Borntraeger >> --- >> arch/s390/kvm/kvm-s390.c | 11 +++++++++++ >> 1 file changed, 11 insertions(+) >> >> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c >> index b6113285f47f..1b6963bbc96f 100644 >> --- a/arch/s390/kvm/kvm-s390.c >> +++ b/arch/s390/kvm/kvm-s390.c >> @@ -4025,6 +4025,7 @@ static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) >> return vcpu_post_run_fault_in_sie(vcpu); >> } >> >> +#define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK) >> static int __vcpu_run(struct kvm_vcpu *vcpu) >> { >> int rc, exit_reason; >> @@ -4061,6 +4062,16 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) >> memcpy(vcpu->run->s.regs.gprs, >> sie_page->pv_grregs, >> sizeof(sie_page->pv_grregs)); >> + /* >> + * We're not allowed to inject interrupts on intercepts >> + * that leave the guest state in an "in-between" state >> + * where the next SIE entry will do a continuation. >> + * Fence interrupts in our "internal" PSW. >> + */ >> + if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR || >> + vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) { >> + vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK; >> + } > > Is this actually the right approach? I mean, you lose PSW masks, but you > only want to teach the interrupt delivery code to skip delivering > interrupts until the intercept has been handled. Does not look clean to > me TBH. The only purpose of the PSW mask in PV is to tell the hypervisor what interrupts are deliverable or if we are in wait state. In fact those bits are the only ones that we see. So I think its fair to use those.