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hw: hyperv: Initial commit for Synthetic Debugging device 

Signed-off-by: Jon Doron <arilou@gmail.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20220216102500.692781-5-arilou@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jon Doron 2022-02-16 12:25:00 +02:00 committed by Paolo Bonzini
parent 73d2407407
commit d8701185f4
4 changed files with 414 additions and 0 deletions
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5
hw/hyperv/Kconfig
View File

@ -11,3 +11,8 @@ config VMBUS
bool
default y
depends on HYPERV
config SYNDBG
bool
default y
depends on VMBUS

1
hw/hyperv/meson.build
View File

@ -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'))

402
hw/hyperv/syndbg.c Normal file
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@ -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)

6
target/i386/kvm/kvm.c
View File

@ -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,