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Fri, 19 Sep 2025 17:20:23 GMT Received: from smtprelay07.wdc07v.mail.ibm.com ([172.16.1.74]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4997a294ss-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 19 Sep 2025 17:20:23 +0000 Received: from smtpav05.dal12v.mail.ibm.com (smtpav05.dal12v.mail.ibm.com [10.241.53.104]) by smtprelay07.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 58JHKLJF27198174 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 19 Sep 2025 17:20:21 GMT Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6308858068; Fri, 19 Sep 2025 17:20:21 +0000 (GMT) Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3090658065; Fri, 19 Sep 2025 17:20:20 +0000 (GMT) Received: from [9.61.246.121] (unknown [9.61.246.121]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 19 Sep 2025 17:20:20 +0000 (GMT) Message-ID: <76486a98-dfc3-47f4-984c-98998dc8fea9@linux.ibm.com> Date: Fri, 19 Sep 2025 10:20:13 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 07/28] s390x/diag: Implement DIAG 320 subcode 1 To: Zhuoying Cai , thuth@redhat.com, berrange@redhat.com, richard.henderson@linaro.org, david@redhat.com, jrossi@linux.ibm.com, qemu-s390x@nongnu.org, qemu-devel@nongnu.org Cc: walling@linux.ibm.com, jjherne@linux.ibm.com, pasic@linux.ibm.com, borntraeger@linux.ibm.com, farman@linux.ibm.com, mjrosato@linux.ibm.com, iii@linux.ibm.com, eblake@redhat.com, armbru@redhat.com References: <20250917232131.495848-1-zycai@linux.ibm.com> <20250917232131.495848-8-zycai@linux.ibm.com> Content-Language: en-US From: Farhan Ali In-Reply-To: <20250917232131.495848-8-zycai@linux.ibm.com> Content-Type: text/plain; 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envelope-from=alifm@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Reviewed-by: Farhan Ali On 9/17/2025 4:21 PM, Zhuoying Cai wrote: > DIAG 320 subcode 1 provides information needed to determine > the amount of storage to store one or more certificates from the > certificate store. > > Upon successful completion, this subcode returns information of the current > cert store, such as the number of certificates stored and allowed in the cert > store, amount of space may need to be allocate to store a certificate, > etc for verification-certificate blocks (VCBs). > > The subcode value is denoted by setting the left-most bit > of an 8-byte field. > > The verification-certificate-storage-size block (VCSSB) contains > the output data when the operation completes successfully. A VCSSB > length of 4 indicates that no certificate are available in the cert > store. > > Signed-off-by: Zhuoying Cai > --- > docs/specs/s390x-secure-ipl.rst | 10 ++++++ > include/hw/s390x/ipl/diag320.h | 22 ++++++++++++ > target/s390x/diag.c | 59 ++++++++++++++++++++++++++++++++- > 3 files changed, 90 insertions(+), 1 deletion(-) > > diff --git a/docs/specs/s390x-secure-ipl.rst b/docs/specs/s390x-secure-ipl.rst > index 30ddc81c2b..4217f19c84 100644 > --- a/docs/specs/s390x-secure-ipl.rst > +++ b/docs/specs/s390x-secure-ipl.rst > @@ -25,3 +25,13 @@ Subcode 0 - query installed subcodes > Returns a 256-bit installed subcodes mask (ISM) stored in the installed > subcodes block (ISB). This mask indicates which sucodes are currently > installed and available for use. > + > +Subcode 1 - query verification certificate storage information > + Provides the information required to determine the amount of memory needed to > + store one or more verification-certificates (VCs) from the certificate store (CS). > + > + Upon successful completion, this subcode returns various storage size values for > + verification-certificate blocks (VCBs). > + > + The output is returned in the verification-certificate-storage-size block (VCSSB). > + A VCSSB length of 4 indicates that no certificates are available in the CS. > diff --git a/include/hw/s390x/ipl/diag320.h b/include/hw/s390x/ipl/diag320.h > index aa04b699c6..6e4779c699 100644 > --- a/include/hw/s390x/ipl/diag320.h > +++ b/include/hw/s390x/ipl/diag320.h > @@ -11,10 +11,32 @@ > #define S390X_DIAG320_H > > #define DIAG_320_SUBC_QUERY_ISM 0 > +#define DIAG_320_SUBC_QUERY_VCSI 1 > > #define DIAG_320_RC_OK 0x0001 > #define DIAG_320_RC_NOT_SUPPORTED 0x0102 > +#define DIAG_320_RC_INVAL_VCSSB_LEN 0x0202 > > #define DIAG_320_ISM_QUERY_SUBCODES 0x80000000 > +#define DIAG_320_ISM_QUERY_VCSI 0x40000000 > + > +#define VCSSB_NO_VC 4 > +#define VCSSB_MIN_LEN 128 > +#define VCE_HEADER_LEN 128 > +#define VCB_HEADER_LEN 64 > + > +struct VCStorageSizeBlock { > + uint32_t length; > + uint8_t reserved0[3]; > + uint8_t version; > + uint32_t reserved1[6]; > + uint16_t total_vc_ct; > + uint16_t max_vc_ct; > + uint32_t reserved3[11]; > + uint32_t max_single_vcb_len; > + uint32_t total_vcb_len; > + uint32_t reserved4[10]; > +}; > +typedef struct VCStorageSizeBlock VCStorageSizeBlock; > > #endif > diff --git a/target/s390x/diag.c b/target/s390x/diag.c > index e67ee57f01..4e6de483b8 100644 > --- a/target/s390x/diag.c > +++ b/target/s390x/diag.c > @@ -191,11 +191,50 @@ out: > } > } > > +static int handle_diag320_query_vcsi(S390CPU *cpu, uint64_t addr, uint64_t r1, > + uintptr_t ra, S390IPLCertificateStore *qcs) > +{ > + g_autofree VCStorageSizeBlock *vcssb = NULL; > + > + vcssb = g_new0(VCStorageSizeBlock, 1); > + if (s390_cpu_virt_mem_read(cpu, addr, r1, vcssb, sizeof(*vcssb))) { > + s390_cpu_virt_mem_handle_exc(cpu, ra); > + return -1; > + } > + > + if (be32_to_cpu(vcssb->length) < VCSSB_MIN_LEN) { > + return DIAG_320_RC_INVAL_VCSSB_LEN; > + } > + > + if (!qcs->count) { > + vcssb->length = cpu_to_be32(VCSSB_NO_VC); > + } else { > + vcssb->version = 0; > + vcssb->total_vc_ct = cpu_to_be16(qcs->count); > + vcssb->max_vc_ct = cpu_to_be16(MAX_CERTIFICATES); > + vcssb->max_single_vcb_len = cpu_to_be32(VCB_HEADER_LEN + VCE_HEADER_LEN + > + qcs->max_cert_size); > + vcssb->total_vcb_len = cpu_to_be32(VCB_HEADER_LEN + qcs->count * VCE_HEADER_LEN + > + qcs->total_bytes); > + } > + > + if (s390_cpu_virt_mem_write(cpu, addr, r1, vcssb, be32_to_cpu(vcssb->length))) { > + s390_cpu_virt_mem_handle_exc(cpu, ra); > + return -1; > + } > + return DIAG_320_RC_OK; > +} > + > +QEMU_BUILD_BUG_MSG(sizeof(VCStorageSizeBlock) != VCSSB_MIN_LEN, > + "size of VCStorageSizeBlock is wrong"); > + > void handle_diag_320(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra) > { > S390CPU *cpu = env_archcpu(env); > + S390IPLCertificateStore *qcs = s390_ipl_get_certificate_store(); > uint64_t subcode = env->regs[r3]; > uint64_t addr = env->regs[r1]; > + int rc; > > if (env->psw.mask & PSW_MASK_PSTATE) { > s390_program_interrupt(env, PGM_PRIVILEGED, ra); > @@ -219,7 +258,8 @@ void handle_diag_320(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra) > * but the current set of subcodes can fit within a single word > * for now. > */ > - uint32_t ism_word0 = cpu_to_be32(DIAG_320_ISM_QUERY_SUBCODES); > + uint32_t ism_word0 = cpu_to_be32(DIAG_320_ISM_QUERY_SUBCODES | > + DIAG_320_ISM_QUERY_VCSI); > > if (s390_cpu_virt_mem_write(cpu, addr, r1, &ism_word0, sizeof(ism_word0))) { > s390_cpu_virt_mem_handle_exc(cpu, ra); > @@ -228,6 +268,23 @@ void handle_diag_320(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra) > > env->regs[r1 + 1] = DIAG_320_RC_OK; > break; > + case DIAG_320_SUBC_QUERY_VCSI: > + if (!diag_parm_addr_valid(addr, sizeof(VCStorageSizeBlock), true)) { > + s390_program_interrupt(env, PGM_ADDRESSING, ra); > + return; > + } > + > + if (addr & 0x7) { > + s390_program_interrupt(env, PGM_ADDRESSING, ra); > + return; > + } > + > + rc = handle_diag320_query_vcsi(cpu, addr, r1, ra, qcs); > + if (rc == -1) { > + return; > + } > + env->regs[r1 + 1] = rc; > + break; > default: > env->regs[r1 + 1] = DIAG_320_RC_NOT_SUPPORTED; > break;