--- /dev/null
+/*
+ * SCLP Support
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ * Christian Borntraeger <borntraeger@de.ibm.com>
+ * Heinz Graalfs <graalfs@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version. See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "cpu.h"
+#include "sysemu/kvm.h"
+#include "exec/memory.h"
+#include "sysemu/sysemu.h"
+#include "exec/address-spaces.h"
+#include "qemu/config-file.h"
+#include "hw/s390x/sclp.h"
+#include "hw/s390x/event-facility.h"
+#include "hw/s390x/s390-pci-bus.h"
+
+static inline SCLPEventFacility *get_event_facility(void)
+{
+ ObjectProperty *op = object_property_find(qdev_get_machine(),
+ TYPE_SCLP_EVENT_FACILITY,
+ NULL);
+ assert(op);
+ return op->opaque;
+}
+
+/* Provide information about the configuration, CPUs and storage */
+static void read_SCP_info(SCCB *sccb)
+{
+ ReadInfo *read_info = (ReadInfo *) sccb;
+ sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
+ CPUState *cpu;
+ int cpu_count = 0;
+ int i = 0;
+ int increment_size = 20;
+ int rnsize, rnmax;
+ QemuOpts *opts = qemu_opts_find(qemu_find_opts("memory"), NULL);
+ int slots = qemu_opt_get_number(opts, "slots", 0);
+ int max_avail_slots = s390_get_memslot_count(kvm_state);
+
+ if (slots > max_avail_slots) {
+ slots = max_avail_slots;
+ }
+
+ CPU_FOREACH(cpu) {
+ cpu_count++;
+ }
+
+ /* CPU information */
+ read_info->entries_cpu = cpu_to_be16(cpu_count);
+ read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
+ read_info->highest_cpu = cpu_to_be16(max_cpus);
+
+ for (i = 0; i < cpu_count; i++) {
+ read_info->entries[i].address = i;
+ read_info->entries[i].type = 0;
+ }
+
+ read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
+ SCLP_HAS_PCI_RECONFIG);
+
+ /*
+ * The storage increment size is a multiple of 1M and is a power of 2.
+ * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
+ */
+ while ((ram_size >> increment_size) > MAX_STORAGE_INCREMENTS) {
+ increment_size++;
+ }
+ rnmax = ram_size >> increment_size;
+
+ /* Memory Hotplug is only supported for the ccw machine type */
+ if (mhd) {
+ while ((mhd->standby_mem_size >> increment_size) >
+ MAX_STORAGE_INCREMENTS) {
+ increment_size++;
+ }
+ assert(increment_size == mhd->increment_size);
+
+ mhd->standby_subregion_size = MEM_SECTION_SIZE;
+ /* Deduct the memory slot already used for core */
+ if (slots > 0) {
+ while ((mhd->standby_subregion_size * (slots - 1)
+ < mhd->standby_mem_size)) {
+ mhd->standby_subregion_size = mhd->standby_subregion_size << 1;
+ }
+ }
+ /*
+ * Initialize mapping of guest standby memory sections indicating which
+ * are and are not online. Assume all standby memory begins offline.
+ */
+ if (mhd->standby_state_map == 0) {
+ if (mhd->standby_mem_size % mhd->standby_subregion_size) {
+ mhd->standby_state_map = g_malloc0((mhd->standby_mem_size /
+ mhd->standby_subregion_size + 1) *
+ (mhd->standby_subregion_size /
+ MEM_SECTION_SIZE));
+ } else {
+ mhd->standby_state_map = g_malloc0(mhd->standby_mem_size /
+ MEM_SECTION_SIZE);
+ }
+ }
+ mhd->padded_ram_size = ram_size + mhd->pad_size;
+ mhd->rzm = 1 << mhd->increment_size;
+ rnmax = ((ram_size + mhd->standby_mem_size + mhd->pad_size)
+ >> mhd->increment_size);
+
+ read_info->facilities |= cpu_to_be64(SCLP_FC_ASSIGN_ATTACH_READ_STOR);
+ }
+
+ rnsize = 1 << (increment_size - 20);
+ if (rnsize <= 128) {
+ read_info->rnsize = rnsize;
+ } else {
+ read_info->rnsize = 0;
+ read_info->rnsize2 = cpu_to_be32(rnsize);
+ }
+
+ if (rnmax < 0x10000) {
+ read_info->rnmax = cpu_to_be16(rnmax);
+ } else {
+ read_info->rnmax = cpu_to_be16(0);
+ read_info->rnmax2 = cpu_to_be64(rnmax);
+ }
+
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
+}
+
+static void read_storage_element0_info(SCCB *sccb)
+{
+ int i, assigned;
+ int subincrement_id = SCLP_STARTING_SUBINCREMENT_ID;
+ ReadStorageElementInfo *storage_info = (ReadStorageElementInfo *) sccb;
+ sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
+
+ assert(mhd);
+
+ if ((ram_size >> mhd->increment_size) >= 0x10000) {
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
+ return;
+ }
+
+ /* Return information regarding core memory */
+ storage_info->max_id = cpu_to_be16(mhd->standby_mem_size ? 1 : 0);
+ assigned = ram_size >> mhd->increment_size;
+ storage_info->assigned = cpu_to_be16(assigned);
+
+ for (i = 0; i < assigned; i++) {
+ storage_info->entries[i] = cpu_to_be32(subincrement_id);
+ subincrement_id += SCLP_INCREMENT_UNIT;
+ }
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
+}
+
+static void read_storage_element1_info(SCCB *sccb)
+{
+ ReadStorageElementInfo *storage_info = (ReadStorageElementInfo *) sccb;
+ sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
+
+ assert(mhd);
+
+ if ((mhd->standby_mem_size >> mhd->increment_size) >= 0x10000) {
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
+ return;
+ }
+
+ /* Return information regarding standby memory */
+ storage_info->max_id = cpu_to_be16(mhd->standby_mem_size ? 1 : 0);
+ storage_info->assigned = cpu_to_be16(mhd->standby_mem_size >>
+ mhd->increment_size);
+ storage_info->standby = cpu_to_be16(mhd->standby_mem_size >>
+ mhd->increment_size);
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_STANDBY_READ_COMPLETION);
+}
+
+static void attach_storage_element(SCCB *sccb, uint16_t element)
+{
+ int i, assigned, subincrement_id;
+ AttachStorageElement *attach_info = (AttachStorageElement *) sccb;
+ sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
+
+ assert(mhd);
+
+ if (element != 1) {
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
+ return;
+ }
+
+ assigned = mhd->standby_mem_size >> mhd->increment_size;
+ attach_info->assigned = cpu_to_be16(assigned);
+ subincrement_id = ((ram_size >> mhd->increment_size) << 16)
+ + SCLP_STARTING_SUBINCREMENT_ID;
+ for (i = 0; i < assigned; i++) {
+ attach_info->entries[i] = cpu_to_be32(subincrement_id);
+ subincrement_id += SCLP_INCREMENT_UNIT;
+ }
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
+}
+
+static void assign_storage(SCCB *sccb)
+{
+ MemoryRegion *mr = NULL;
+ uint64_t this_subregion_size;
+ AssignStorage *assign_info = (AssignStorage *) sccb;
+ sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
+ assert(mhd);
+ ram_addr_t assign_addr = (assign_info->rn - 1) * mhd->rzm;
+ MemoryRegion *sysmem = get_system_memory();
+
+ if ((assign_addr % MEM_SECTION_SIZE == 0) &&
+ (assign_addr >= mhd->padded_ram_size)) {
+ /* Re-use existing memory region if found */
+ mr = memory_region_find(sysmem, assign_addr, 1).mr;
+ if (!mr) {
+
+ MemoryRegion *standby_ram = g_new(MemoryRegion, 1);
+
+ /* offset to align to standby_subregion_size for allocation */
+ ram_addr_t offset = assign_addr -
+ (assign_addr - mhd->padded_ram_size)
+ % mhd->standby_subregion_size;
+
+ /* strlen("standby.ram") + 4 (Max of KVM_MEMORY_SLOTS) + NULL */
+ char id[16];
+ snprintf(id, 16, "standby.ram%d",
+ (int)((offset - mhd->padded_ram_size) /
+ mhd->standby_subregion_size) + 1);
+
+ /* Allocate a subregion of the calculated standby_subregion_size */
+ if (offset + mhd->standby_subregion_size >
+ mhd->padded_ram_size + mhd->standby_mem_size) {
+ this_subregion_size = mhd->padded_ram_size +
+ mhd->standby_mem_size - offset;
+ } else {
+ this_subregion_size = mhd->standby_subregion_size;
+ }
+
+ memory_region_init_ram(standby_ram, NULL, id, this_subregion_size, &error_abort);
+ vmstate_register_ram_global(standby_ram);
+ memory_region_add_subregion(sysmem, offset, standby_ram);
+ }
+ /* The specified subregion is no longer in standby */
+ mhd->standby_state_map[(assign_addr - mhd->padded_ram_size)
+ / MEM_SECTION_SIZE] = 1;
+ }
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
+}
+
+static void unassign_storage(SCCB *sccb)
+{
+ MemoryRegion *mr = NULL;
+ AssignStorage *assign_info = (AssignStorage *) sccb;
+ sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
+ assert(mhd);
+ ram_addr_t unassign_addr = (assign_info->rn - 1) * mhd->rzm;
+ MemoryRegion *sysmem = get_system_memory();
+
+ /* if the addr is a multiple of 256 MB */
+ if ((unassign_addr % MEM_SECTION_SIZE == 0) &&
+ (unassign_addr >= mhd->padded_ram_size)) {
+ mhd->standby_state_map[(unassign_addr -
+ mhd->padded_ram_size) / MEM_SECTION_SIZE] = 0;
+
+ /* find the specified memory region and destroy it */
+ mr = memory_region_find(sysmem, unassign_addr, 1).mr;
+ if (mr) {
+ int i;
+ int is_removable = 1;
+ ram_addr_t map_offset = (unassign_addr - mhd->padded_ram_size -
+ (unassign_addr - mhd->padded_ram_size)
+ % mhd->standby_subregion_size);
+ /* Mark all affected subregions as 'standby' once again */
+ for (i = 0;
+ i < (mhd->standby_subregion_size / MEM_SECTION_SIZE);
+ i++) {
+
+ if (mhd->standby_state_map[i + map_offset / MEM_SECTION_SIZE]) {
+ is_removable = 0;
+ break;
+ }
+ }
+ if (is_removable) {
+ memory_region_del_subregion(sysmem, mr);
+ object_unparent(OBJECT(mr));
+ g_free(mr);
+ }
+ }
+ }
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
+}
+
+/* Provide information about the CPU */
+static void sclp_read_cpu_info(SCCB *sccb)
+{
+ ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
+ CPUState *cpu;
+ int cpu_count = 0;
+ int i = 0;
+
+ CPU_FOREACH(cpu) {
+ cpu_count++;
+ }
+
+ cpu_info->nr_configured = cpu_to_be16(cpu_count);
+ cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
+ cpu_info->nr_standby = cpu_to_be16(0);
+
+ /* The standby offset is 16-byte for each CPU */
+ cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
+ + cpu_info->nr_configured*sizeof(CPUEntry));
+
+ for (i = 0; i < cpu_count; i++) {
+ cpu_info->entries[i].address = i;
+ cpu_info->entries[i].type = 0;
+ }
+
+ sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
+}
+
+static void sclp_execute(SCCB *sccb, uint32_t code)
+{
+ SCLPEventFacility *ef = get_event_facility();
+ SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
+
+ switch (code & SCLP_CMD_CODE_MASK) {
+ case SCLP_CMDW_READ_SCP_INFO:
+ case SCLP_CMDW_READ_SCP_INFO_FORCED:
+ read_SCP_info(sccb);
+ break;
+ case SCLP_CMDW_READ_CPU_INFO:
+ sclp_read_cpu_info(sccb);
+ break;
+ case SCLP_READ_STORAGE_ELEMENT_INFO:
+ if (code & 0xff00) {
+ read_storage_element1_info(sccb);
+ } else {
+ read_storage_element0_info(sccb);
+ }
+ break;
+ case SCLP_ATTACH_STORAGE_ELEMENT:
+ attach_storage_element(sccb, (code & 0xff00) >> 8);
+ break;
+ case SCLP_ASSIGN_STORAGE:
+ assign_storage(sccb);
+ break;
+ case SCLP_UNASSIGN_STORAGE:
+ unassign_storage(sccb);
+ break;
+ case SCLP_CMDW_CONFIGURE_PCI:
+ s390_pci_sclp_configure(1, sccb);
+ break;
+ case SCLP_CMDW_DECONFIGURE_PCI:
+ s390_pci_sclp_configure(0, sccb);
+ break;
+ default:
+ efc->command_handler(ef, sccb, code);
+ break;
+ }
+}
+
+int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
+{
+ int r = 0;
+ SCCB work_sccb;
+
+ hwaddr sccb_len = sizeof(SCCB);
+
+ /* first some basic checks on program checks */
+ if (env->psw.mask & PSW_MASK_PSTATE) {
+ r = -PGM_PRIVILEGED;
+ goto out;
+ }
+ if (cpu_physical_memory_is_io(sccb)) {
+ r = -PGM_ADDRESSING;
+ goto out;
+ }
+ if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
+ || (sccb & ~0x7ffffff8UL) != 0) {
+ r = -PGM_SPECIFICATION;
+ goto out;
+ }
+
+ /*
+ * we want to work on a private copy of the sccb, to prevent guests
+ * from playing dirty tricks by modifying the memory content after
+ * the host has checked the values
+ */
+ cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
+
+ /* Valid sccb sizes */
+ if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
+ be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
+ r = -PGM_SPECIFICATION;
+ goto out;
+ }
+
+ sclp_execute((SCCB *)&work_sccb, code);
+
+ cpu_physical_memory_write(sccb, &work_sccb,
+ be16_to_cpu(work_sccb.h.length));
+
+ sclp_service_interrupt(sccb);
+
+out:
+ return r;
+}
+
+void sclp_service_interrupt(uint32_t sccb)
+{
+ SCLPEventFacility *ef = get_event_facility();
+ SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
+
+ uint32_t param = sccb & ~3;
+
+ /* Indicate whether an event is still pending */
+ param |= efc->event_pending(ef) ? 1 : 0;
+
+ if (!param) {
+ /* No need to send an interrupt, there's nothing to be notified about */
+ return;
+ }
+ s390_sclp_extint(param);
+}
+
+/* qemu object creation and initialization functions */
+
+void s390_sclp_init(void)
+{
+ DeviceState *dev = qdev_create(NULL, TYPE_SCLP_EVENT_FACILITY);
+
+ object_property_add_child(qdev_get_machine(), TYPE_SCLP_EVENT_FACILITY,
+ OBJECT(dev), NULL);
+ qdev_init_nofail(dev);
+}
+
+sclpMemoryHotplugDev *init_sclp_memory_hotplug_dev(void)
+{
+ DeviceState *dev;
+ dev = qdev_create(NULL, TYPE_SCLP_MEMORY_HOTPLUG_DEV);
+ object_property_add_child(qdev_get_machine(),
+ TYPE_SCLP_MEMORY_HOTPLUG_DEV,
+ OBJECT(dev), NULL);
+ qdev_init_nofail(dev);
+ return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
+ TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
+}
+
+sclpMemoryHotplugDev *get_sclp_memory_hotplug_dev(void)
+{
+ return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
+ TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
+}
+
+static void sclp_memory_hotplug_dev_class_init(ObjectClass *klass,
+ void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+}
+
+static TypeInfo sclp_memory_hotplug_dev_info = {
+ .name = TYPE_SCLP_MEMORY_HOTPLUG_DEV,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(sclpMemoryHotplugDev),
+ .class_init = sclp_memory_hotplug_dev_class_init,
+};
+
+static void register_types(void)
+{
+ type_register_static(&sclp_memory_hotplug_dev_info);
+}
+type_init(register_types);
Code Review / kvmfornfv.git / blobdiff