diff options
| -rw-r--r-- | hw/hyperv/Kconfig | 5 | ||||
| -rw-r--r-- | hw/hyperv/meson.build | 1 | ||||
| -rw-r--r-- | hw/hyperv/syndbg.c | 402 | ||||
| -rw-r--r-- | target/i386/kvm/kvm.c | 6 |
4 files changed, 414 insertions, 0 deletions
diff --git a/hw/hyperv/Kconfig b/hw/hyperv/Kconfig index 3fbfe41..fcf6590 100644 --- a/hw/hyperv/Kconfig +++ b/hw/hyperv/Kconfig @@ -11,3 +11,8 @@ config VMBUS bool default y depends on HYPERV + +config SYNDBG + bool + default y + depends on VMBUS diff --git a/hw/hyperv/meson.build b/hw/hyperv/meson.build index 1367e29..b43f119 100644 --- a/hw/hyperv/meson.build +++ b/hw/hyperv/meson.build @@ -1,3 +1,4 @@ specific_ss.add(when: 'CONFIG_HYPERV', if_true: files('hyperv.c')) specific_ss.add(when: 'CONFIG_HYPERV_TESTDEV', if_true: files('hyperv_testdev.c')) specific_ss.add(when: 'CONFIG_VMBUS', if_true: files('vmbus.c')) +specific_ss.add(when: 'CONFIG_SYNDBG', if_true: files('syndbg.c')) diff --git a/hw/hyperv/syndbg.c b/hw/hyperv/syndbg.c new file mode 100644 index 0000000..89ae19b --- /dev/null +++ b/hw/hyperv/syndbg.c @@ -0,0 +1,402 @@ +/* + * QEMU Hyper-V Synthetic Debugging device + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/ctype.h" +#include "qemu/osdep.h" +#include "qemu/error-report.h" +#include "qemu/main-loop.h" +#include "qemu/sockets.h" +#include "qemu-common.h" +#include "qapi/error.h" +#include "migration/vmstate.h" +#include "hw/qdev-properties.h" +#include "hw/loader.h" +#include "cpu.h" +#include "hw/hyperv/hyperv.h" +#include "hw/hyperv/vmbus-bridge.h" +#include "hw/hyperv/hyperv-proto.h" +#include "net/net.h" +#include "net/eth.h" +#include "net/checksum.h" +#include "trace.h" + +#define TYPE_HV_SYNDBG "hv-syndbg" + +typedef struct HvSynDbg { + DeviceState parent_obj; + + char *host_ip; + uint16_t host_port; + bool use_hcalls; + + uint32_t target_ip; + struct sockaddr_in servaddr; + int socket; + bool has_data_pending; + uint64_t pending_page_gpa; +} HvSynDbg; + +#define HVSYNDBG(obj) OBJECT_CHECK(HvSynDbg, (obj), TYPE_HV_SYNDBG) + +/* returns NULL unless there is exactly one HV Synth debug device */ +static HvSynDbg *hv_syndbg_find(void) +{ + /* Returns NULL unless there is exactly one hvsd device */ + return HVSYNDBG(object_resolve_path_type("", TYPE_HV_SYNDBG, NULL)); +} + +static void set_pending_state(HvSynDbg *syndbg, bool has_pending) +{ + hwaddr out_len; + void *out_data; + + syndbg->has_data_pending = has_pending; + + if (!syndbg->pending_page_gpa) { + return; + } + + out_len = 1; + out_data = cpu_physical_memory_map(syndbg->pending_page_gpa, &out_len, 1); + if (out_data) { + *(uint8_t *)out_data = !!has_pending; + cpu_physical_memory_unmap(out_data, out_len, 1, out_len); + } +} + +static bool get_udb_pkt_data(void *p, uint32_t len, uint32_t *data_ofs, + uint32_t *src_ip) +{ + uint32_t offset, curr_len = len; + + if (curr_len < sizeof(struct eth_header) || + (be16_to_cpu(PKT_GET_ETH_HDR(p)->h_proto) != ETH_P_IP)) { + return false; + } + offset = sizeof(struct eth_header); + curr_len -= sizeof(struct eth_header); + + if (curr_len < sizeof(struct ip_header) || + PKT_GET_IP_HDR(p)->ip_p != IP_PROTO_UDP) { + return false; + } + offset += PKT_GET_IP_HDR_LEN(p); + curr_len -= PKT_GET_IP_HDR_LEN(p); + + if (curr_len < sizeof(struct udp_header)) { + return false; + } + + offset += sizeof(struct udp_header); + *data_ofs = offset; + *src_ip = PKT_GET_IP_HDR(p)->ip_src; + return true; +} + +static uint16_t handle_send_msg(HvSynDbg *syndbg, uint64_t ingpa, + uint32_t count, bool is_raw, + uint32_t *pending_count) +{ + uint16_t ret; + hwaddr data_len; + void *debug_data = NULL; + uint32_t udp_data_ofs = 0; + const void *pkt_data; + int sent_count; + + data_len = count; + debug_data = cpu_physical_memory_map(ingpa, &data_len, 0); + if (!debug_data || data_len < count) { + ret = HV_STATUS_INSUFFICIENT_MEMORY; + goto cleanup; + } + + if (is_raw && + !get_udb_pkt_data(debug_data, count, &udp_data_ofs, + &syndbg->target_ip)) { + ret = HV_STATUS_SUCCESS; + goto cleanup; + } + + pkt_data = (const void *)((uintptr_t)debug_data + udp_data_ofs); + sent_count = sendto(syndbg->socket, pkt_data, count - udp_data_ofs, + MSG_NOSIGNAL, NULL, 0); + if (sent_count == -1) { + ret = HV_STATUS_INSUFFICIENT_MEMORY; + goto cleanup; + } + + *pending_count = count - (sent_count + udp_data_ofs); + ret = HV_STATUS_SUCCESS; +cleanup: + if (debug_data) { + cpu_physical_memory_unmap(debug_data, count, 0, data_len); + } + + return ret; +} + +#define UDP_PKT_HEADER_SIZE \ + (sizeof(struct eth_header) + sizeof(struct ip_header) +\ + sizeof(struct udp_header)) + +static bool create_udp_pkt(HvSynDbg *syndbg, void *pkt, uint32_t pkt_len, + void *udp_data, uint32_t udp_data_len) +{ + struct udp_header *udp_part; + + if (pkt_len < (UDP_PKT_HEADER_SIZE + udp_data_len)) { + return false; + } + + /* Setup the eth */ + memset(&PKT_GET_ETH_HDR(pkt)->h_source, 0, ETH_ALEN); + memset(&PKT_GET_ETH_HDR(pkt)->h_dest, 0, ETH_ALEN); + PKT_GET_ETH_HDR(pkt)->h_proto = cpu_to_be16(ETH_P_IP); + + /* Setup the ip */ + PKT_GET_IP_HDR(pkt)->ip_ver_len = + (4 << 4) | (sizeof(struct ip_header) >> 2); + PKT_GET_IP_HDR(pkt)->ip_tos = 0; + PKT_GET_IP_HDR(pkt)->ip_id = 0; + PKT_GET_IP_HDR(pkt)->ip_off = 0; + PKT_GET_IP_HDR(pkt)->ip_ttl = 64; /* IPDEFTTL */ + PKT_GET_IP_HDR(pkt)->ip_p = IP_PROTO_UDP; + PKT_GET_IP_HDR(pkt)->ip_src = syndbg->servaddr.sin_addr.s_addr; + PKT_GET_IP_HDR(pkt)->ip_dst = syndbg->target_ip; + PKT_GET_IP_HDR(pkt)->ip_len = + cpu_to_be16(sizeof(struct ip_header) + sizeof(struct udp_header) + + udp_data_len); + eth_fix_ip4_checksum(PKT_GET_IP_HDR(pkt), PKT_GET_IP_HDR_LEN(pkt)); + + udp_part = (struct udp_header *)((uintptr_t)pkt + + sizeof(struct eth_header) + + PKT_GET_IP_HDR_LEN(pkt)); + udp_part->uh_sport = syndbg->servaddr.sin_port; + udp_part->uh_dport = syndbg->servaddr.sin_port; + udp_part->uh_ulen = cpu_to_be16(sizeof(struct udp_header) + udp_data_len); + memcpy(udp_part + 1, udp_data, udp_data_len); + net_checksum_calculate(pkt, UDP_PKT_HEADER_SIZE + udp_data_len, CSUM_ALL); + return true; +} + +static uint16_t handle_recv_msg(HvSynDbg *syndbg, uint64_t outgpa, + uint32_t count, bool is_raw, uint32_t options, + uint64_t timeout, uint32_t *retrieved_count) +{ + uint16_t ret; + uint8_t data_buf[TARGET_PAGE_SIZE - UDP_PKT_HEADER_SIZE]; + hwaddr out_len; + void *out_data; + ssize_t recv_byte_count; + + /* TODO: Handle options and timeout */ + (void)options; + (void)timeout; + + if (!syndbg->has_data_pending) { + recv_byte_count = 0; + } else { + recv_byte_count = recv(syndbg->socket, data_buf, + MIN(sizeof(data_buf), count), MSG_WAITALL); + if (recv_byte_count == -1) { + return HV_STATUS_INVALID_PARAMETER; + } + } + + if (!recv_byte_count) { + *retrieved_count = 0; + return HV_STATUS_NO_DATA; + } + + set_pending_state(syndbg, false); + + out_len = recv_byte_count; + if (is_raw) { + out_len += UDP_PKT_HEADER_SIZE; + } + out_data = cpu_physical_memory_map(outgpa, &out_len, 1); + if (!out_data) { + return HV_STATUS_INSUFFICIENT_MEMORY; + } + + if (is_raw && + !create_udp_pkt(syndbg, out_data, + recv_byte_count + UDP_PKT_HEADER_SIZE, + data_buf, recv_byte_count)) { + ret = HV_STATUS_INSUFFICIENT_MEMORY; + goto cleanup_out_data; + } else if (!is_raw) { + memcpy(out_data, data_buf, recv_byte_count); + } + + *retrieved_count = recv_byte_count; + if (is_raw) { + *retrieved_count += UDP_PKT_HEADER_SIZE; + } + ret = HV_STATUS_SUCCESS; + +cleanup_out_data: + cpu_physical_memory_unmap(out_data, out_len, 1, out_len); + return ret; +} + +static uint16_t hv_syndbg_handler(void *context, HvSynDbgMsg *msg) +{ + HvSynDbg *syndbg = context; + uint16_t ret = HV_STATUS_INVALID_HYPERCALL_CODE; + + switch (msg->type) { + case HV_SYNDBG_MSG_CONNECTION_INFO: + msg->u.connection_info.host_ip = + ntohl(syndbg->servaddr.sin_addr.s_addr); + msg->u.connection_info.host_port = + ntohs(syndbg->servaddr.sin_port); + ret = HV_STATUS_SUCCESS; + break; + case HV_SYNDBG_MSG_SEND: + ret = handle_send_msg(syndbg, msg->u.send.buf_gpa, msg->u.send.count, + msg->u.send.is_raw, &msg->u.send.pending_count); + break; + case HV_SYNDBG_MSG_RECV: + ret = handle_recv_msg(syndbg, msg->u.recv.buf_gpa, msg->u.recv.count, + msg->u.recv.is_raw, msg->u.recv.options, + msg->u.recv.timeout, + &msg->u.recv.retrieved_count); + break; + case HV_SYNDBG_MSG_SET_PENDING_PAGE: + syndbg->pending_page_gpa = msg->u.pending_page.buf_gpa; + ret = HV_STATUS_SUCCESS; + break; + case HV_SYNDBG_MSG_QUERY_OPTIONS: + msg->u.query_options.options = 0; + if (syndbg->use_hcalls) { + msg->u.query_options.options = HV_X64_SYNDBG_OPTION_USE_HCALLS; + } + ret = HV_STATUS_SUCCESS; + break; + default: + break; + } + + return ret; +} + +static void hv_syndbg_recv_event(void *opaque) +{ + HvSynDbg *syndbg = opaque; + struct timeval tv; + fd_set rfds; + + tv.tv_sec = 0; + tv.tv_usec = 0; + FD_ZERO(&rfds); + FD_SET(syndbg->socket, &rfds); + if (select(syndbg->socket + 1, &rfds, NULL, NULL, &tv) > 0) { + set_pending_state(syndbg, true); + } +} + +static void hv_syndbg_realize(DeviceState *dev, Error **errp) +{ + HvSynDbg *syndbg = HVSYNDBG(dev); + + if (!hv_syndbg_find()) { + error_setg(errp, "at most one %s device is permitted", TYPE_HV_SYNDBG); + return; + } + + if (!vmbus_bridge_find()) { + error_setg(errp, "%s device requires vmbus-bridge device", + TYPE_HV_SYNDBG); + return; + } + + /* Parse and host_ip */ + if (qemu_isdigit(syndbg->host_ip[0])) { + syndbg->servaddr.sin_addr.s_addr = inet_addr(syndbg->host_ip); + } else { + struct hostent *he = gethostbyname(syndbg->host_ip); + if (!he) { + error_setg(errp, "%s failed to resolve host name %s", + TYPE_HV_SYNDBG, syndbg->host_ip); + return; + } + syndbg->servaddr.sin_addr = *(struct in_addr *)he->h_addr; + } + + syndbg->socket = socket(AF_INET, SOCK_DGRAM, 0); + if (syndbg->socket < 0) { + error_setg(errp, "%s failed to create socket", TYPE_HV_SYNDBG); + return; + } + + qemu_set_nonblock(syndbg->socket); + + syndbg->servaddr.sin_port = htons(syndbg->host_port); + syndbg->servaddr.sin_family = AF_INET; + if (connect(syndbg->socket, (struct sockaddr *)&syndbg->servaddr, + sizeof(syndbg->servaddr)) < 0) { + closesocket(syndbg->socket); + error_setg(errp, "%s failed to connect to socket", TYPE_HV_SYNDBG); + return; + } + + syndbg->pending_page_gpa = 0; + syndbg->has_data_pending = false; + hyperv_set_syndbg_handler(hv_syndbg_handler, syndbg); + qemu_set_fd_handler(syndbg->socket, hv_syndbg_recv_event, NULL, syndbg); +} + +static void hv_syndbg_unrealize(DeviceState *dev) +{ + HvSynDbg *syndbg = HVSYNDBG(dev); + + if (syndbg->socket > 0) { + qemu_set_fd_handler(syndbg->socket, NULL, NULL, NULL); + closesocket(syndbg->socket); + } +} + +static const VMStateDescription vmstate_hv_syndbg = { + .name = TYPE_HV_SYNDBG, + .unmigratable = 1, +}; + +static Property hv_syndbg_properties[] = { + DEFINE_PROP_STRING("host_ip", HvSynDbg, host_ip), + DEFINE_PROP_UINT16("host_port", HvSynDbg, host_port, 50000), + DEFINE_PROP_BOOL("use_hcalls", HvSynDbg, use_hcalls, false), + DEFINE_PROP_END_OF_LIST(), +}; + +static void hv_syndbg_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + device_class_set_props(dc, hv_syndbg_properties); + dc->fw_name = TYPE_HV_SYNDBG; + dc->vmsd = &vmstate_hv_syndbg; + dc->realize = hv_syndbg_realize; + dc->unrealize = hv_syndbg_unrealize; + dc->user_creatable = true; + set_bit(DEVICE_CATEGORY_MISC, dc->categories); +} + +static const TypeInfo hv_syndbg_type_info = { + .name = TYPE_HV_SYNDBG, + .parent = TYPE_DEVICE, + .instance_size = sizeof(HvSynDbg), + .class_init = hv_syndbg_class_init, +}; + +static void hv_syndbg_register_types(void) +{ + type_register_static(&hv_syndbg_type_info); +} + +type_init(hv_syndbg_register_types) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 0bb3176..c885763 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -54,6 +54,8 @@ #include "exec/memattrs.h" #include "trace.h" +#include CONFIG_DEVICES + //#define DEBUG_KVM #ifdef DEBUG_KVM @@ -965,6 +967,7 @@ static struct { .bits = HV_DEPRECATING_AEOI_RECOMMENDED} } }, +#ifdef CONFIG_SYNDBG [HYPERV_FEAT_SYNDBG] = { .desc = "Enable synthetic kernel debugger channel (hv-syndbg)", .flags = { @@ -973,6 +976,7 @@ static struct { }, .dependencies = BIT(HYPERV_FEAT_SYNIC) | BIT(HYPERV_FEAT_RELAXED) }, +#endif }; static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max, @@ -3233,11 +3237,13 @@ static int kvm_put_msrs(X86CPU *cpu, int level) kvm_msr_entry_add(cpu, HV_X64_MSR_TSC_EMULATION_STATUS, env->msr_hv_tsc_emulation_status); } +#ifdef CONFIG_SYNDBG if (hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNDBG) && has_msr_hv_syndbg_options) { kvm_msr_entry_add(cpu, HV_X64_MSR_SYNDBG_OPTIONS, hyperv_syndbg_query_options()); } +#endif } if (hyperv_feat_enabled(cpu, HYPERV_FEAT_VAPIC)) { kvm_msr_entry_add(cpu, HV_X64_MSR_APIC_ASSIST_PAGE, |