1*6e43353fSMarc-André Lureau /* 2*6e43353fSMarc-André Lureau * Virtual Machine coreinfo device 3*6e43353fSMarc-André Lureau * 4*6e43353fSMarc-André Lureau * Copyright (C) 2017 Red Hat, Inc. 5*6e43353fSMarc-André Lureau * 6*6e43353fSMarc-André Lureau * Authors: Marc-André Lureau <marcandre.lureau@redhat.com> 7*6e43353fSMarc-André Lureau * 8*6e43353fSMarc-André Lureau * This work is licensed under the terms of the GNU GPL, version 2 or later. 9*6e43353fSMarc-André Lureau * See the COPYING file in the top-level directory. 10*6e43353fSMarc-André Lureau * 11*6e43353fSMarc-André Lureau */ 12*6e43353fSMarc-André Lureau #include "qemu/osdep.h" 13*6e43353fSMarc-André Lureau #include "qapi/error.h" 14*6e43353fSMarc-André Lureau #include "hw/nvram/fw_cfg.h" 15*6e43353fSMarc-André Lureau #include "hw/misc/vmcoreinfo.h" 16*6e43353fSMarc-André Lureau 17*6e43353fSMarc-André Lureau static void fw_cfg_vmci_write(void *dev, off_t offset, size_t len) 18*6e43353fSMarc-André Lureau { 19*6e43353fSMarc-André Lureau VMCoreInfoState *s = VMCOREINFO(dev); 20*6e43353fSMarc-André Lureau 21*6e43353fSMarc-André Lureau s->has_vmcoreinfo = offset == 0 && len == sizeof(s->vmcoreinfo) 22*6e43353fSMarc-André Lureau && s->vmcoreinfo.guest_format != VMCOREINFO_FORMAT_NONE; 23*6e43353fSMarc-André Lureau } 24*6e43353fSMarc-André Lureau 25*6e43353fSMarc-André Lureau static void vmcoreinfo_reset(void *dev) 26*6e43353fSMarc-André Lureau { 27*6e43353fSMarc-André Lureau VMCoreInfoState *s = VMCOREINFO(dev); 28*6e43353fSMarc-André Lureau 29*6e43353fSMarc-André Lureau s->has_vmcoreinfo = false; 30*6e43353fSMarc-André Lureau memset(&s->vmcoreinfo, 0, sizeof(s->vmcoreinfo)); 31*6e43353fSMarc-André Lureau s->vmcoreinfo.host_format = cpu_to_le16(VMCOREINFO_FORMAT_ELF); 32*6e43353fSMarc-André Lureau } 33*6e43353fSMarc-André Lureau 34*6e43353fSMarc-André Lureau static void vmcoreinfo_realize(DeviceState *dev, Error **errp) 35*6e43353fSMarc-André Lureau { 36*6e43353fSMarc-André Lureau VMCoreInfoState *s = VMCOREINFO(dev); 37*6e43353fSMarc-André Lureau FWCfgState *fw_cfg = fw_cfg_find(); 38*6e43353fSMarc-André Lureau 39*6e43353fSMarc-André Lureau /* Given that this function is executing, there is at least one VMCOREINFO 40*6e43353fSMarc-André Lureau * device. Check if there are several. 41*6e43353fSMarc-André Lureau */ 42*6e43353fSMarc-André Lureau if (!vmcoreinfo_find()) { 43*6e43353fSMarc-André Lureau error_setg(errp, "at most one %s device is permitted", 44*6e43353fSMarc-André Lureau VMCOREINFO_DEVICE); 45*6e43353fSMarc-André Lureau return; 46*6e43353fSMarc-André Lureau } 47*6e43353fSMarc-André Lureau 48*6e43353fSMarc-André Lureau if (!fw_cfg || !fw_cfg->dma_enabled) { 49*6e43353fSMarc-André Lureau error_setg(errp, "%s device requires fw_cfg with DMA", 50*6e43353fSMarc-André Lureau VMCOREINFO_DEVICE); 51*6e43353fSMarc-André Lureau return; 52*6e43353fSMarc-André Lureau } 53*6e43353fSMarc-André Lureau 54*6e43353fSMarc-André Lureau fw_cfg_add_file_callback(fw_cfg, "etc/vmcoreinfo", 55*6e43353fSMarc-André Lureau NULL, fw_cfg_vmci_write, s, 56*6e43353fSMarc-André Lureau &s->vmcoreinfo, sizeof(s->vmcoreinfo), false); 57*6e43353fSMarc-André Lureau 58*6e43353fSMarc-André Lureau qemu_register_reset(vmcoreinfo_reset, dev); 59*6e43353fSMarc-André Lureau } 60*6e43353fSMarc-André Lureau 61*6e43353fSMarc-André Lureau static const VMStateDescription vmstate_vmcoreinfo = { 62*6e43353fSMarc-André Lureau .name = "vmcoreinfo", 63*6e43353fSMarc-André Lureau .version_id = 1, 64*6e43353fSMarc-André Lureau .minimum_version_id = 1, 65*6e43353fSMarc-André Lureau .fields = (VMStateField[]) { 66*6e43353fSMarc-André Lureau VMSTATE_BOOL(has_vmcoreinfo, VMCoreInfoState), 67*6e43353fSMarc-André Lureau VMSTATE_UINT16(vmcoreinfo.host_format, VMCoreInfoState), 68*6e43353fSMarc-André Lureau VMSTATE_UINT16(vmcoreinfo.guest_format, VMCoreInfoState), 69*6e43353fSMarc-André Lureau VMSTATE_UINT32(vmcoreinfo.size, VMCoreInfoState), 70*6e43353fSMarc-André Lureau VMSTATE_UINT64(vmcoreinfo.paddr, VMCoreInfoState), 71*6e43353fSMarc-André Lureau VMSTATE_END_OF_LIST() 72*6e43353fSMarc-André Lureau }, 73*6e43353fSMarc-André Lureau }; 74*6e43353fSMarc-André Lureau 75*6e43353fSMarc-André Lureau static void vmcoreinfo_device_class_init(ObjectClass *klass, void *data) 76*6e43353fSMarc-André Lureau { 77*6e43353fSMarc-André Lureau DeviceClass *dc = DEVICE_CLASS(klass); 78*6e43353fSMarc-André Lureau 79*6e43353fSMarc-André Lureau dc->vmsd = &vmstate_vmcoreinfo; 80*6e43353fSMarc-André Lureau dc->realize = vmcoreinfo_realize; 81*6e43353fSMarc-André Lureau dc->hotpluggable = false; 82*6e43353fSMarc-André Lureau } 83*6e43353fSMarc-André Lureau 84*6e43353fSMarc-André Lureau static const TypeInfo vmcoreinfo_device_info = { 85*6e43353fSMarc-André Lureau .name = VMCOREINFO_DEVICE, 86*6e43353fSMarc-André Lureau .parent = TYPE_DEVICE, 87*6e43353fSMarc-André Lureau .instance_size = sizeof(VMCoreInfoState), 88*6e43353fSMarc-André Lureau .class_init = vmcoreinfo_device_class_init, 89*6e43353fSMarc-André Lureau }; 90*6e43353fSMarc-André Lureau 91*6e43353fSMarc-André Lureau static void vmcoreinfo_register_types(void) 92*6e43353fSMarc-André Lureau { 93*6e43353fSMarc-André Lureau type_register_static(&vmcoreinfo_device_info); 94*6e43353fSMarc-André Lureau } 95*6e43353fSMarc-André Lureau 96*6e43353fSMarc-André Lureau type_init(vmcoreinfo_register_types) 97