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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 29 Nov 2019 14:34:24 -0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xATEYNoF55246886 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 29 Nov 2019 14:34:23 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3F0F4A4053; Fri, 29 Nov 2019 14:34:23 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C93D2A4051; Fri, 29 Nov 2019 14:34:22 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.188.128]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 29 Nov 2019 14:34:22 +0000 (GMT) Subject: Re: [PATCH 3/3] s390x: protvirt: Add new VCPU reset functions To: David Hildenbrand , qemu-devel@nongnu.org References: <20191129142025.21453-1-frankja@linux.ibm.com> <20191129142025.21453-4-frankja@linux.ibm.com> <1b6b2cc3-cd28-7bfe-655c-cc3e7c084848@redhat.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <1b6b2cc3-cd28-7bfe-655c-cc3e7c084848@redhat.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Kyk2XR5Fj7lcFsehfeTmZ1iTvaxfWuCx2" X-TM-AS-GCONF: 00 x-cbid: 19112914-0012-0000-0000-0000036DF359 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19112914-0013-0000-0000-000021A9A4B5 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-11-29_04:2019-11-29,2019-11-29 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 bulkscore=0 phishscore=0 adultscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 impostorscore=0 priorityscore=1501 mlxlogscore=999 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1911290126 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: borntraeger@de.ibm.com, thuth@redhat.com, mihajlov@linux.ibm.com, qemu-s390x@nongnu.org, cohuck@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --Kyk2XR5Fj7lcFsehfeTmZ1iTvaxfWuCx2 Content-Type: multipart/mixed; boundary="6jKUumAVmENWRC15i76gsKyZsjRngEVuh" --6jKUumAVmENWRC15i76gsKyZsjRngEVuh Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 11/29/19 3:24 PM, David Hildenbrand wrote: > On 29.11.19 15:20, Janosch Frank wrote: >> CPU resets for protected guests need to be done via Ultravisor >> calls. Hence we need a way to issue these calls for each reset. >> >> As we formerly had only one reset function and it was called for >> initial, as well as for the clear reset, we now need a new interface. >> >> Signed-off-by: Janosch Frank >> --- >> target/s390x/cpu.c | 14 ++++++++++++-- >> target/s390x/kvm-stub.c | 10 +++++++++- >> target/s390x/kvm.c | 38 ++++++++++++++++++++++++++++++++------ >> target/s390x/kvm_s390x.h | 4 +++- >> 4 files changed, 56 insertions(+), 10 deletions(-) >> >> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c >> index 829ce6ad54..906285888e 100644 >> --- a/target/s390x/cpu.c >> +++ b/target/s390x/cpu.c >> @@ -139,8 +139,18 @@ static void s390_cpu_reset(CPUState *s, cpu_reset= _type type) >> } >> =20 >> /* Reset state inside the kernel that we cannot access yet from Q= EMU. */ >> - if (kvm_enabled() && type !=3D S390_CPU_RESET_NORMAL) { >> - kvm_s390_reset_vcpu(cpu); >> + if (kvm_enabled()) { >> + switch (type) { >> + case S390_CPU_RESET_CLEAR: >> + kvm_s390_reset_vcpu_clear(cpu); >> + break; >> + case S390_CPU_RESET_INITIAL: >> + kvm_s390_reset_vcpu_initial(cpu); >> + break; >> + case S390_CPU_RESET_NORMAL: >> + kvm_s390_reset_vcpu_normal(cpu); >> + break; >> + } >> } >> } >> =20 >> diff --git a/target/s390x/kvm-stub.c b/target/s390x/kvm-stub.c >> index 5152e2bdf1..c4cd497f85 100644 >> --- a/target/s390x/kvm-stub.c >> +++ b/target/s390x/kvm-stub.c >> @@ -83,7 +83,15 @@ void kvm_s390_cmma_reset(void) >> { >> } >> =20 >> -void kvm_s390_reset_vcpu(S390CPU *cpu) >> +void kvm_s390_reset_vcpu_initial(S390CPU *cpu) >> +{ >> +} >> + >> +void kvm_s390_reset_vcpu_clear(S390CPU *cpu) >> +{ >> +} >> + >> +void kvm_s390_reset_vcpu_normal(S390CPU *cpu) >> { >> } >> =20 >> diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c >> index ad6e38c876..502fc71664 100644 >> --- a/target/s390x/kvm.c >> +++ b/target/s390x/kvm.c >> @@ -151,6 +151,7 @@ static int cap_s390_irq; >> static int cap_ri; >> static int cap_gs; >> static int cap_hpage_1m; >> +static int cap_vcpu_resets; >> =20 >> static int active_cmma; >> =20 >> @@ -342,6 +343,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) >> cap_async_pf =3D kvm_check_extension(s, KVM_CAP_ASYNC_PF); >> cap_mem_op =3D kvm_check_extension(s, KVM_CAP_S390_MEM_OP); >> cap_s390_irq =3D kvm_check_extension(s, KVM_CAP_S390_INJECT_IRQ);= >> + cap_vcpu_resets =3D kvm_check_extension(s, KVM_CAP_S390_VCPU_RESE= TS); >> =20 >> if (!kvm_check_extension(s, KVM_CAP_S390_GMAP) >> || !kvm_check_extension(s, KVM_CAP_S390_COW)) { >> @@ -403,20 +405,44 @@ int kvm_arch_destroy_vcpu(CPUState *cs) >> return 0; >> } >> =20 >> -void kvm_s390_reset_vcpu(S390CPU *cpu) >> +static void kvm_s390_reset_vcpu(S390CPU *cpu, unsigned long type) >> { >> CPUState *cs =3D CPU(cpu); >> =20 >> - /* The initial reset call is needed here to reset in-kernel >> - * vcpu data that we can't access directly from QEMU >> - * (i.e. with older kernels which don't support sync_regs/ONE_REG= ). >> - * Before this ioctl cpu_synchronize_state() is called in common = kvm >> - * code (kvm-all) */ >> + /* >> + * The reset call is needed here to reset in-kernel vcpu data tha= t >> + * we can't access directly from QEMU (i.e. with older kernels >> + * which don't support sync_regs/ONE_REG). Before this ioctl >> + * cpu_synchronize_state() is called in common kvm code >> + * (kvm-all). >> + */ >> + if (cap_vcpu_resets) { >> + if (kvm_vcpu_ioctl(cs, KVM_S390_VCPU_RESET, type)) { >> + error_report("CPU reset type %ld failed on CPU %i", >> + type, cs->cpu_index); >> + } >> + return; >> + } >> if (kvm_vcpu_ioctl(cs, KVM_S390_INITIAL_RESET, NULL)) { >> error_report("Initial CPU reset failed on CPU %i", cs->cpu_in= dex); >> } >> } >=20 > I think I commented this already: The issue is that without > cap_vcpu_requests, you would no do a KVM_S390_INITIAL_RESET for type =3D= =3D > S390_CPU_RESET_NORMAL. You have to fence that. I did fix that, but not on this branch -_- >=20 >=20 > if (type !=3D S390_CPU_RESET_NORMAL && > kvm_vcpu_ioctl(cs, KVM_S390_INITIAL_RESET, NULL)) { > ... > } >=20 --6jKUumAVmENWRC15i76gsKyZsjRngEVuh-- --Kyk2XR5Fj7lcFsehfeTmZ1iTvaxfWuCx2 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl3hLG4ACgkQ41TmuOI4 ufh9NBAAp1gjGBnrj1L3RaNHAJcxS6s2Okw9R4CbfZdum2y7d924Lt5K35ACofwP ZhAM4+AI5PIH63UPCdeaWsUsFrUkknABHQTISMc/lqc1QlP9xlT4a8HLcmvklfkV 6VZhsK8Z0SuRxkARR8HGjmAFVuzAfCyEDfqLVqGwG6CAmHEMTbQdKSEEDGyUrmBJ RLfLXIAgQP58ycuI1FZuLi5HmJ+C2RhgeLQRM8thezrvaDF2ZakTJSQnJyyqkTrn dPkA1A1JW3uDDQlmCRnaY/7xlBMQkcFsUXnBmwNmQRBhJZqgtXs2ToeMQ8I9TuFC tw7H+FantdOiuTUmXSbCFwtHLb6vPXVhRkb/kr5O/5H4//7v4hdImODkWPtGQTdV rAvMjqifhlEzroCiziIALH+NnZdTBoYTrlqJw3fM1Fjq3Jf70gB8rIw6SL/44HhT r8w35b7A5zTaol6mAF2XXX+d+GZ+UmO07OlkIYsmpF7WP+zIA7SnyIQVJeTGhhl0 xdfzCIAw+/ZVl4aPpdpMJ4/1ttuWqHyIbUhexQ9ILoA5xNWkk8rKLPF1+m4LF5Zq HzORIX2PAzi+1PsghMnvVIfPtlgHt6ij0l3Rt99QHGsauVERPYwxjkenkoWmFNFA uByn3ZgOi+Vvhk4uH+v+SEnfYfvyP3hHZgAIMC0pNZJtI6qu8yM= =AC+4 -----END PGP SIGNATURE----- --Kyk2XR5Fj7lcFsehfeTmZ1iTvaxfWuCx2--