Return the correct error code when the SCCB buffer is too small to contain all of the output, for the Read SCP Information and Read CPU Information commands. Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com> Message-Id: <1569591203-15258-5-git-send-email-imbrenda@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
407 lines
12 KiB
C
407 lines
12 KiB
C
/*
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* SCLP Support
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Christian Borntraeger <borntraeger@de.ibm.com>
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* Heinz Graalfs <graalfs@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at your
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* option) any later version. See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/units.h"
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#include "qapi/error.h"
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#include "cpu.h"
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#include "sysemu/sysemu.h"
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#include "hw/boards.h"
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#include "hw/s390x/sclp.h"
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#include "hw/s390x/event-facility.h"
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#include "hw/s390x/s390-pci-bus.h"
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#include "hw/s390x/ipl.h"
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static inline SCLPDevice *get_sclp_device(void)
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{
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static SCLPDevice *sclp;
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if (!sclp) {
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sclp = SCLP(object_resolve_path_type("", TYPE_SCLP, NULL));
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}
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return sclp;
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}
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static void prepare_cpu_entries(SCLPDevice *sclp, CPUEntry *entry, int *count)
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{
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MachineState *ms = MACHINE(qdev_get_machine());
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uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 };
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int i;
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s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features);
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for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) {
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if (!ms->possible_cpus->cpus[i].cpu) {
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continue;
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}
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entry[*count].address = ms->possible_cpus->cpus[i].arch_id;
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entry[*count].type = 0;
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memcpy(entry[*count].features, features, sizeof(features));
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(*count)++;
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}
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}
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/* Provide information about the configuration, CPUs and storage */
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static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
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{
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ReadInfo *read_info = (ReadInfo *) sccb;
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MachineState *machine = MACHINE(qdev_get_machine());
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int cpu_count;
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int rnsize, rnmax;
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IplParameterBlock *ipib = s390_ipl_get_iplb();
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/* CPU information */
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prepare_cpu_entries(sclp, read_info->entries, &cpu_count);
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read_info->entries_cpu = cpu_to_be16(cpu_count);
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read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
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read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1);
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read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
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if (be16_to_cpu(sccb->h.length) <
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(sizeof(ReadInfo) + cpu_count * sizeof(CPUEntry))) {
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sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
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return;
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}
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/* Configuration Characteristic (Extension) */
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s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
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read_info->conf_char);
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s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
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read_info->conf_char_ext);
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read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
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SCLP_HAS_IOA_RECONFIG);
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read_info->mha_pow = s390_get_mha_pow();
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read_info->hmfai = cpu_to_be32(s390_get_hmfai());
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rnsize = 1 << (sclp->increment_size - 20);
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if (rnsize <= 128) {
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read_info->rnsize = rnsize;
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} else {
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read_info->rnsize = 0;
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read_info->rnsize2 = cpu_to_be32(rnsize);
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}
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/* we don't support standby memory, maxram_size is never exposed */
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rnmax = machine->ram_size >> sclp->increment_size;
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if (rnmax < 0x10000) {
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read_info->rnmax = cpu_to_be16(rnmax);
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} else {
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read_info->rnmax = cpu_to_be16(0);
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read_info->rnmax2 = cpu_to_be64(rnmax);
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}
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if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
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memcpy(&read_info->loadparm, &ipib->loadparm,
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sizeof(read_info->loadparm));
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} else {
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s390_ipl_set_loadparm(read_info->loadparm);
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}
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sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
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}
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/* Provide information about the CPU */
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static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
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{
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ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
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int cpu_count;
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prepare_cpu_entries(sclp, cpu_info->entries, &cpu_count);
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cpu_info->nr_configured = cpu_to_be16(cpu_count);
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cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
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cpu_info->nr_standby = cpu_to_be16(0);
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if (be16_to_cpu(sccb->h.length) <
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(sizeof(ReadCpuInfo) + cpu_count * sizeof(CPUEntry))) {
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sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
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return;
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}
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/* The standby offset is 16-byte for each CPU */
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cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
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+ cpu_info->nr_configured*sizeof(CPUEntry));
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sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
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}
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static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
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bool configure)
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{
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int rc;
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if (be16_to_cpu(sccb->h.length) < 16) {
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rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
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goto out_err;
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}
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switch (((IoaCfgSccb *)sccb)->atype) {
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case SCLP_RECONFIG_PCI_ATYPE:
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if (s390_has_feat(S390_FEAT_ZPCI)) {
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if (configure) {
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s390_pci_sclp_configure(sccb);
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} else {
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s390_pci_sclp_deconfigure(sccb);
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}
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return;
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}
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/* fallthrough */
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default:
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rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
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}
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out_err:
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sccb->h.response_code = cpu_to_be16(rc);
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}
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static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
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{
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SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
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SCLPEventFacility *ef = sclp->event_facility;
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SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
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switch (code & SCLP_CMD_CODE_MASK) {
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case SCLP_CMDW_READ_SCP_INFO:
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case SCLP_CMDW_READ_SCP_INFO_FORCED:
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sclp_c->read_SCP_info(sclp, sccb);
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break;
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case SCLP_CMDW_READ_CPU_INFO:
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sclp_c->read_cpu_info(sclp, sccb);
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break;
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case SCLP_CMDW_CONFIGURE_IOA:
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sclp_configure_io_adapter(sclp, sccb, true);
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break;
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case SCLP_CMDW_DECONFIGURE_IOA:
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sclp_configure_io_adapter(sclp, sccb, false);
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break;
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default:
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efc->command_handler(ef, sccb, code);
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break;
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}
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}
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int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
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{
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SCLPDevice *sclp = get_sclp_device();
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SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
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int r = 0;
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SCCB work_sccb;
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hwaddr sccb_len = sizeof(SCCB);
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/* first some basic checks on program checks */
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if (env->psw.mask & PSW_MASK_PSTATE) {
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r = -PGM_PRIVILEGED;
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goto out;
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}
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if (cpu_physical_memory_is_io(sccb)) {
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r = -PGM_ADDRESSING;
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goto out;
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}
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if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
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|| (sccb & ~0x7ffffff8UL) != 0) {
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r = -PGM_SPECIFICATION;
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goto out;
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}
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/*
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* we want to work on a private copy of the sccb, to prevent guests
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* from playing dirty tricks by modifying the memory content after
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* the host has checked the values
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*/
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cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
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/* Valid sccb sizes */
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if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader)) {
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r = -PGM_SPECIFICATION;
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goto out;
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}
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switch (code & SCLP_CMD_CODE_MASK) {
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case SCLP_CMDW_READ_SCP_INFO:
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case SCLP_CMDW_READ_SCP_INFO_FORCED:
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case SCLP_CMDW_READ_CPU_INFO:
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case SCLP_CMDW_CONFIGURE_IOA:
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case SCLP_CMDW_DECONFIGURE_IOA:
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case SCLP_CMD_READ_EVENT_DATA:
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case SCLP_CMD_WRITE_EVENT_DATA:
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case SCLP_CMD_WRITE_EVENT_MASK:
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break;
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default:
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work_sccb.h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
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goto out_write;
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}
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if ((sccb + be16_to_cpu(work_sccb.h.length)) > ((sccb & PAGE_MASK) + PAGE_SIZE)) {
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work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
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goto out_write;
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}
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sclp_c->execute(sclp, &work_sccb, code);
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out_write:
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cpu_physical_memory_write(sccb, &work_sccb,
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be16_to_cpu(work_sccb.h.length));
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sclp_c->service_interrupt(sclp, sccb);
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out:
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return r;
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}
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static void service_interrupt(SCLPDevice *sclp, uint32_t sccb)
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{
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SCLPEventFacility *ef = sclp->event_facility;
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SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
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uint32_t param = sccb & ~3;
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/* Indicate whether an event is still pending */
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param |= efc->event_pending(ef) ? 1 : 0;
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if (!param) {
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/* No need to send an interrupt, there's nothing to be notified about */
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return;
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}
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s390_sclp_extint(param);
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}
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void sclp_service_interrupt(uint32_t sccb)
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{
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SCLPDevice *sclp = get_sclp_device();
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SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
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sclp_c->service_interrupt(sclp, sccb);
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}
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/* qemu object creation and initialization functions */
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void s390_sclp_init(void)
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{
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Object *new = object_new(TYPE_SCLP);
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object_property_add_child(qdev_get_machine(), TYPE_SCLP, new,
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NULL);
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object_unref(OBJECT(new));
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qdev_init_nofail(DEVICE(new));
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}
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static void sclp_realize(DeviceState *dev, Error **errp)
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{
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MachineState *machine = MACHINE(qdev_get_machine());
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SCLPDevice *sclp = SCLP(dev);
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Error *err = NULL;
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uint64_t hw_limit;
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int ret;
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object_property_set_bool(OBJECT(sclp->event_facility), true, "realized",
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&err);
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if (err) {
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goto out;
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}
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/*
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* qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
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* as we can't find a fitting bus via the qom tree, we have to add the
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* event facility to the sysbus, so e.g. a sclp console can be created.
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*/
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qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default());
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ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
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if (ret == -E2BIG) {
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error_setg(&err, "host supports a maximum of %" PRIu64 " GB",
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hw_limit / GiB);
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} else if (ret) {
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error_setg(&err, "setting the guest size failed");
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}
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out:
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error_propagate(errp, err);
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}
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static void sclp_memory_init(SCLPDevice *sclp)
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{
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MachineState *machine = MACHINE(qdev_get_machine());
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ram_addr_t initial_mem = machine->ram_size;
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int increment_size = 20;
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/* The storage increment size is a multiple of 1M and is a power of 2.
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* The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
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* The variable 'increment_size' is an exponent of 2 that can be
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* used to calculate the size (in bytes) of an increment. */
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while ((initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
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increment_size++;
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}
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sclp->increment_size = increment_size;
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/* The core memory area needs to be aligned with the increment size.
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* In effect, this can cause the user-specified memory size to be rounded
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* down to align with the nearest increment boundary. */
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initial_mem = initial_mem >> increment_size << increment_size;
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machine->ram_size = initial_mem;
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machine->maxram_size = initial_mem;
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/* let's propagate the changed ram size into the global variable. */
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ram_size = initial_mem;
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}
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static void sclp_init(Object *obj)
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{
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SCLPDevice *sclp = SCLP(obj);
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Object *new;
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new = object_new(TYPE_SCLP_EVENT_FACILITY);
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object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new, NULL);
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object_unref(new);
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sclp->event_facility = EVENT_FACILITY(new);
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sclp_memory_init(sclp);
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}
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static void sclp_class_init(ObjectClass *oc, void *data)
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{
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SCLPDeviceClass *sc = SCLP_CLASS(oc);
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DeviceClass *dc = DEVICE_CLASS(oc);
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dc->desc = "SCLP (Service-Call Logical Processor)";
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dc->realize = sclp_realize;
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dc->hotpluggable = false;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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/*
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* Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init
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* which is a non-pluggable sysbus device
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*/
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dc->user_creatable = false;
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sc->read_SCP_info = read_SCP_info;
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sc->read_cpu_info = sclp_read_cpu_info;
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sc->execute = sclp_execute;
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sc->service_interrupt = service_interrupt;
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}
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static TypeInfo sclp_info = {
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.name = TYPE_SCLP,
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.parent = TYPE_DEVICE,
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.instance_init = sclp_init,
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.instance_size = sizeof(SCLPDevice),
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.class_init = sclp_class_init,
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.class_size = sizeof(SCLPDeviceClass),
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};
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static void register_types(void)
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{
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type_register_static(&sclp_info);
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}
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type_init(register_types);
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