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Fri, 19 Jun 2020 11:02:50 +0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 05JB2l4810682728 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 19 Jun 2020 11:02:47 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AD19FA405C; Fri, 19 Jun 2020 11:02:47 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 200F1A405B; Fri, 19 Jun 2020 11:02:47 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.7.233]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 19 Jun 2020 11:02:47 +0000 (GMT) Subject: Re: [PATCH v8 2/2] s390/kvm: diagnose 0x318 sync and reset To: Collin Walling , kvm@vger.kernel.org, linux-s390@vger.kernel.org Cc: pbonzini@redhat.com, borntraeger@de.ibm.com, david@redhat.com, cohuck@redhat.com, imbrenda@linux.ibm.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, thuth@redhat.com References: <20200618222222.23175-1-walling@linux.ibm.com> <20200618222222.23175-3-walling@linux.ibm.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200618222222.23175-3-walling@linux.ibm.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="RRRZ5c3ABQteSpgVnZr0tUVzEK3YTbqxF" X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-19_08:2020-06-19,2020-06-19 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 phishscore=0 clxscore=1015 spamscore=0 bulkscore=0 malwarescore=0 adultscore=0 cotscore=-2147483648 impostorscore=0 mlxscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006190074 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --RRRZ5c3ABQteSpgVnZr0tUVzEK3YTbqxF Content-Type: multipart/mixed; boundary="fB9DzA5oDNNIQeDGi72HUd5TnGPQIdR7k" --fB9DzA5oDNNIQeDGi72HUd5TnGPQIdR7k Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 6/19/20 12:22 AM, Collin Walling wrote: > DIAGNOSE 0x318 (diag318) sets information regarding the environment > the VM is running in (Linux, z/VM, etc) and is observed via > firmware/service events. >=20 > This is a privileged s390x instruction that must be intercepted by > SIE. Userspace handles the instruction as well as migration. Data > is communicated via VCPU register synchronization. >=20 > The Control Program Name Code (CPNC) is stored in the SIE block. The > CPNC along with the Control Program Version Code (CPVC) are stored > in the kvm_vcpu_arch struct. >=20 > The CPNC is shadowed/unshadowed in VSIE. >=20 > This data is reset on load normal and clear resets. >=20 > Signed-off-by: Collin Walling Reviewed-by: Janosch Frank Could you extend the s390 kvm selftests sync_regs test with diag318 pleas= e? I'd also like to have it added to the kvm unit tests. You can either do that yourself or I'll add it when I go over my pending patches. Since we can't retrieve these values from the VM, a simple check for the sclp feature bit and an execution of the instruction would be enough. > --- > arch/s390/include/asm/kvm_host.h | 4 +++- > arch/s390/include/uapi/asm/kvm.h | 5 ++++- > arch/s390/kvm/kvm-s390.c | 11 ++++++++++- > arch/s390/kvm/vsie.c | 3 +++ > include/uapi/linux/kvm.h | 1 + > 5 files changed, 21 insertions(+), 3 deletions(-) >=20 > diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/k= vm_host.h > index 3d554887794e..8bdf6f1607ca 100644 > --- a/arch/s390/include/asm/kvm_host.h > +++ b/arch/s390/include/asm/kvm_host.h > @@ -260,7 +260,8 @@ struct kvm_s390_sie_block { > __u32 scaol; /* 0x0064 */ > __u8 sdf; /* 0x0068 */ > __u8 epdx; /* 0x0069 */ > - __u8 reserved6a[2]; /* 0x006a */ > + __u8 cpnc; /* 0x006a */ > + __u8 reserved6b; /* 0x006b */ > __u32 todpr; /* 0x006c */ > #define GISA_FORMAT1 0x00000001 > __u32 gd; /* 0x0070 */ > @@ -745,6 +746,7 @@ struct kvm_vcpu_arch { > bool gs_enabled; > bool skey_enabled; > struct kvm_s390_pv_vcpu pv; > + union diag318_info diag318_info; > }; > =20 > struct kvm_vm_stat { > diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/= asm/kvm.h > index 436ec7636927..2ae1b660086c 100644 > --- a/arch/s390/include/uapi/asm/kvm.h > +++ b/arch/s390/include/uapi/asm/kvm.h > @@ -231,11 +231,13 @@ struct kvm_guest_debug_arch { > #define KVM_SYNC_GSCB (1UL << 9) > #define KVM_SYNC_BPBC (1UL << 10) > #define KVM_SYNC_ETOKEN (1UL << 11) > +#define KVM_SYNC_DIAG318 (1UL << 12) > =20 > #define KVM_SYNC_S390_VALID_FIELDS \ > (KVM_SYNC_PREFIX | KVM_SYNC_GPRS | KVM_SYNC_ACRS | KVM_SYNC_CRS | \ > KVM_SYNC_ARCH0 | KVM_SYNC_PFAULT | KVM_SYNC_VRS | KVM_SYNC_RICCB | \= > - KVM_SYNC_FPRS | KVM_SYNC_GSCB | KVM_SYNC_BPBC | KVM_SYNC_ETOKEN) > + KVM_SYNC_FPRS | KVM_SYNC_GSCB | KVM_SYNC_BPBC | KVM_SYNC_ETOKEN | \ > + KVM_SYNC_DIAG318) > =20 > /* length and alignment of the sdnx as a power of two */ > #define SDNXC 8 > @@ -254,6 +256,7 @@ struct kvm_sync_regs { > __u64 pft; /* pfault token [PFAULT] */ > __u64 pfs; /* pfault select [PFAULT] */ > __u64 pfc; /* pfault compare [PFAULT] */ > + __u64 diag318; /* diagnose 0x318 info */ > union { > __u64 vrs[32][2]; /* vector registers (KVM_SYNC_VRS) */ > __u64 fprs[16]; /* fp registers (KVM_SYNC_FPRS) */ > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > index d0ff26d157bc..b05ad718b64b 100644 > --- a/arch/s390/kvm/kvm-s390.c > +++ b/arch/s390/kvm/kvm-s390.c > @@ -545,6 +545,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, l= ong ext) > case KVM_CAP_S390_AIS_MIGRATION: > case KVM_CAP_S390_VCPU_RESETS: > case KVM_CAP_SET_GUEST_DEBUG: > + case KVM_CAP_S390_DIAG318: > r =3D 1; > break; > case KVM_CAP_S390_HPAGE_1M: > @@ -3267,7 +3268,8 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) > KVM_SYNC_ACRS | > KVM_SYNC_CRS | > KVM_SYNC_ARCH0 | > - KVM_SYNC_PFAULT; > + KVM_SYNC_PFAULT | > + KVM_SYNC_DIAG318; > kvm_s390_set_prefix(vcpu, 0); > if (test_kvm_facility(vcpu->kvm, 64)) > vcpu->run->kvm_valid_regs |=3D KVM_SYNC_RICCB; > @@ -3562,6 +3564,7 @@ static void kvm_arch_vcpu_ioctl_initial_reset(str= uct kvm_vcpu *vcpu) > vcpu->arch.sie_block->pp =3D 0; > vcpu->arch.sie_block->fpf &=3D ~FPF_BPBC; > vcpu->arch.sie_block->todpr =3D 0; > + vcpu->arch.sie_block->cpnc =3D 0; > } > } > =20 > @@ -3579,6 +3582,7 @@ static void kvm_arch_vcpu_ioctl_clear_reset(struc= t kvm_vcpu *vcpu) > =20 > regs->etoken =3D 0; > regs->etoken_extension =3D 0; > + regs->diag318 =3D 0; > } > =20 > int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_reg= s *regs) > @@ -4194,6 +4198,10 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu= , struct kvm_run *kvm_run) > if (vcpu->arch.pfault_token =3D=3D KVM_S390_PFAULT_TOKEN_INVALID) > kvm_clear_async_pf_completion_queue(vcpu); > } > + if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) { > + vcpu->arch.diag318_info.val =3D kvm_run->s.regs.diag318; > + vcpu->arch.sie_block->cpnc =3D vcpu->arch.diag318_info.cpnc; > + } > /* > * If userspace sets the riccb (e.g. after migration) to a valid stat= e, > * we should enable RI here instead of doing the lazy enablement. > @@ -4295,6 +4303,7 @@ static void store_regs_fmt2(struct kvm_vcpu *vcpu= , struct kvm_run *kvm_run) > kvm_run->s.regs.pp =3D vcpu->arch.sie_block->pp; > kvm_run->s.regs.gbea =3D vcpu->arch.sie_block->gbea; > kvm_run->s.regs.bpbc =3D (vcpu->arch.sie_block->fpf & FPF_BPBC) =3D=3D= FPF_BPBC; > + kvm_run->s.regs.diag318 =3D vcpu->arch.diag318_info.val; > if (MACHINE_HAS_GS) { > __ctl_set_bit(2, 4); > if (vcpu->arch.gs_enabled) > diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c > index 9e9056cebfcf..ba83d0568bc7 100644 > --- a/arch/s390/kvm/vsie.c > +++ b/arch/s390/kvm/vsie.c > @@ -423,6 +423,8 @@ static void unshadow_scb(struct kvm_vcpu *vcpu, str= uct vsie_page *vsie_page) > break; > } > =20 > + scb_o->cpnc =3D scb_s->cpnc; > + > if (scb_s->ihcpu !=3D 0xffffU) > scb_o->ihcpu =3D scb_s->ihcpu; > } > @@ -548,6 +550,7 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct= vsie_page *vsie_page) > scb_s->ecd |=3D scb_o->ecd & ECD_ETOKENF; > =20 > scb_s->hpid =3D HPID_VSIE; > + scb_s->cpnc =3D scb_o->cpnc; > =20 > prepare_ibc(vcpu, vsie_page); > rc =3D shadow_crycb(vcpu, vsie_page); > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index 4fdf30316582..35cdb4307904 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -1031,6 +1031,7 @@ struct kvm_ppc_resize_hpt { > #define KVM_CAP_PPC_SECURE_GUEST 181 > #define KVM_CAP_HALT_POLL 182 > #define KVM_CAP_ASYNC_PF_INT 183 > +#define KVM_CAP_S390_DIAG318 184 > =20 > #ifdef KVM_CAP_IRQ_ROUTING > =20 >=20 --fB9DzA5oDNNIQeDGi72HUd5TnGPQIdR7k-- --RRRZ5c3ABQteSpgVnZr0tUVzEK3YTbqxF Content-Type: application/pgp-signature; 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