mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
794511bc51
qemu/hw/hyperv/hyperv.c
Maciej S. Szmigiero 6093637b4d vmbus: Print a warning when enabled without the recommended set of features 
Some Windows versions crash at boot or fail to enable the VMBus device if
they don't see the expected set of Hyper-V features (enlightenments).

Since this provides poor user experience let's warn user if the VMBus
device is enabled without the recommended set of Hyper-V features.

The recommended set is the minimum set of Hyper-V features required to make
the VMBus device work properly in Windows Server versions 2016, 2019 and
2022.

Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
2024-03-08 14:18:56 +01:00

966 lines
27 KiB
C
Raw Blame History

/*
* Hyper-V guest/hypervisor interaction
*
* Copyright (c) 2015-2018 Virtuozzo International GmbH.
*
* 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/osdep.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "qapi/error.h"
#include "exec/address-spaces.h"
#include "exec/memory.h"
#include "sysemu/kvm.h"
#include "qemu/bitops.h"
#include "qemu/error-report.h"
#include "qemu/lockable.h"
#include "qemu/queue.h"
#include "qemu/rcu.h"
#include "qemu/rcu_queue.h"
#include "hw/hyperv/hyperv.h"
#include "qom/object.h"
#include "target/i386/kvm/hyperv-proto.h"
#include "target/i386/cpu.h"
#include "exec/cpu-all.h"
struct SynICState {
DeviceState parent_obj;
CPUState *cs;
bool sctl_enabled;
hwaddr msg_page_addr;
hwaddr event_page_addr;
MemoryRegion msg_page_mr;
MemoryRegion event_page_mr;
struct hyperv_message_page *msg_page;
struct hyperv_event_flags_page *event_page;
QemuMutex sint_routes_mutex;
QLIST_HEAD(, HvSintRoute) sint_routes;
};
#define TYPE_SYNIC "hyperv-synic"
OBJECT_DECLARE_SIMPLE_TYPE(SynICState, SYNIC)
static bool synic_enabled;
bool hyperv_is_synic_enabled(void)
{
return synic_enabled;
}
static SynICState *get_synic(CPUState *cs)
{
return SYNIC(object_resolve_path_component(OBJECT(cs), "synic"));
}
static void synic_update(SynICState *synic, bool sctl_enable,
hwaddr msg_page_addr, hwaddr event_page_addr)
{
synic->sctl_enabled = sctl_enable;
if (synic->msg_page_addr != msg_page_addr) {
if (synic->msg_page_addr) {
memory_region_del_subregion(get_system_memory(),
&synic->msg_page_mr);
}
if (msg_page_addr) {
memory_region_add_subregion(get_system_memory(), msg_page_addr,
&synic->msg_page_mr);
}
synic->msg_page_addr = msg_page_addr;
}
if (synic->event_page_addr != event_page_addr) {
if (synic->event_page_addr) {
memory_region_del_subregion(get_system_memory(),
&synic->event_page_mr);
}
if (event_page_addr) {
memory_region_add_subregion(get_system_memory(), event_page_addr,
&synic->event_page_mr);
}
synic->event_page_addr = event_page_addr;
}
}
void hyperv_synic_update(CPUState *cs, bool sctl_enable,
hwaddr msg_page_addr, hwaddr event_page_addr)
{
SynICState *synic = get_synic(cs);
if (!synic) {
return;
}
synic_update(synic, sctl_enable, msg_page_addr, event_page_addr);
}
static void synic_realize(DeviceState *dev, Error **errp)
{
Object *obj = OBJECT(dev);
SynICState *synic = SYNIC(dev);
char *msgp_name, *eventp_name;
uint32_t vp_index;
/* memory region names have to be globally unique */
vp_index = hyperv_vp_index(synic->cs);
msgp_name = g_strdup_printf("synic-%u-msg-page", vp_index);
eventp_name = g_strdup_printf("synic-%u-event-page", vp_index);
memory_region_init_ram(&synic->msg_page_mr, obj, msgp_name,
sizeof(*synic->msg_page), &error_abort);
memory_region_init_ram(&synic->event_page_mr, obj, eventp_name,
sizeof(*synic->event_page), &error_abort);
synic->msg_page = memory_region_get_ram_ptr(&synic->msg_page_mr);
synic->event_page = memory_region_get_ram_ptr(&synic->event_page_mr);
qemu_mutex_init(&synic->sint_routes_mutex);
QLIST_INIT(&synic->sint_routes);
g_free(msgp_name);
g_free(eventp_name);
}
static void synic_reset(DeviceState *dev)
{
SynICState *synic = SYNIC(dev);
memset(synic->msg_page, 0, sizeof(*synic->msg_page));
memset(synic->event_page, 0, sizeof(*synic->event_page));
synic_update(synic, false, 0, 0);
assert(QLIST_EMPTY(&synic->sint_routes));
}
static void synic_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = synic_realize;
dc->reset = synic_reset;
dc->user_creatable = false;
}
void hyperv_synic_add(CPUState *cs)
{
Object *obj;
SynICState *synic;
obj = object_new(TYPE_SYNIC);
synic = SYNIC(obj);
synic->cs = cs;
object_property_add_child(OBJECT(cs), "synic", obj);
object_unref(obj);
qdev_realize(DEVICE(obj), NULL, &error_abort);
synic_enabled = true;
}
void hyperv_synic_reset(CPUState *cs)
{
SynICState *synic = get_synic(cs);
if (synic) {
device_cold_reset(DEVICE(synic));
}
}
static const TypeInfo synic_type_info = {
.name = TYPE_SYNIC,
.parent = TYPE_DEVICE,
.instance_size = sizeof(SynICState),
.class_init = synic_class_init,
};
static void synic_register_types(void)
{
type_register_static(&synic_type_info);
}
type_init(synic_register_types)
/*
* KVM has its own message producers (SynIC timers). To guarantee
* serialization with both KVM vcpu and the guest cpu, the messages are first
* staged in an intermediate area and then posted to the SynIC message page in
* the vcpu thread.
*/
typedef struct HvSintStagedMessage {
/* message content staged by hyperv_post_msg */
struct hyperv_message msg;
/* callback + data (r/o) to complete the processing in a BH */
HvSintMsgCb cb;
void *cb_data;
/* message posting status filled by cpu_post_msg */
int status;
/* passing the buck: */
enum {
/* initial state */
HV_STAGED_MSG_FREE,
/*
* hyperv_post_msg (e.g. in main loop) grabs the staged area (FREE ->
* BUSY), copies msg, and schedules cpu_post_msg on the assigned cpu
*/
HV_STAGED_MSG_BUSY,
/*
* cpu_post_msg (vcpu thread) tries to copy staged msg to msg slot,
* notify the guest, records the status, marks the posting done (BUSY
* -> POSTED), and schedules sint_msg_bh BH
*/
HV_STAGED_MSG_POSTED,
/*
* sint_msg_bh (BH) verifies that the posting is done, runs the
* callback, and starts over (POSTED -> FREE)
*/
} state;
} HvSintStagedMessage;
struct HvSintRoute {
uint32_t sint;
SynICState *synic;
int gsi;
EventNotifier sint_set_notifier;
EventNotifier sint_ack_notifier;
HvSintStagedMessage *staged_msg;
unsigned refcount;
QLIST_ENTRY(HvSintRoute) link;
};
static CPUState *hyperv_find_vcpu(uint32_t vp_index)
{
CPUState *cs = qemu_get_cpu(vp_index);
assert(hyperv_vp_index(cs) == vp_index);
return cs;
}
/*
* BH to complete the processing of a staged message.
*/
static void sint_msg_bh(void *opaque)
{
HvSintRoute *sint_route = opaque;
HvSintStagedMessage *staged_msg = sint_route->staged_msg;
if (qatomic_read(&staged_msg->state) != HV_STAGED_MSG_POSTED) {
/* status nor ready yet (spurious ack from guest?), ignore */
return;
}
staged_msg->cb(staged_msg->cb_data, staged_msg->status);
staged_msg->status = 0;
/* staged message processing finished, ready to start over */
qatomic_set(&staged_msg->state, HV_STAGED_MSG_FREE);
/* drop the reference taken in hyperv_post_msg */
hyperv_sint_route_unref(sint_route);
}
/*
* Worker to transfer the message from the staging area into the SynIC message
* page in vcpu context.
*/
static void cpu_post_msg(CPUState *cs, run_on_cpu_data data)
{
HvSintRoute *sint_route = data.host_ptr;
HvSintStagedMessage *staged_msg = sint_route->staged_msg;
SynICState *synic = sint_route->synic;
struct hyperv_message *dst_msg;
bool wait_for_sint_ack = false;
assert(staged_msg->state == HV_STAGED_MSG_BUSY);
if (!synic->msg_page_addr) {
staged_msg->status = -ENXIO;
goto posted;
}
dst_msg = &synic->msg_page->slot[sint_route->sint];
if (dst_msg->header.message_type != HV_MESSAGE_NONE) {
dst_msg->header.message_flags |= HV_MESSAGE_FLAG_PENDING;
staged_msg->status = -EAGAIN;
wait_for_sint_ack = true;
} else {
memcpy(dst_msg, &staged_msg->msg, sizeof(*dst_msg));
staged_msg->status = hyperv_sint_route_set_sint(sint_route);
}
memory_region_set_dirty(&synic->msg_page_mr, 0, sizeof(*synic->msg_page));
posted:
qatomic_set(&staged_msg->state, HV_STAGED_MSG_POSTED);
/*
* Notify the msg originator of the progress made; if the slot was busy we
* set msg_pending flag in it so it will be the guest who will do EOM and
* trigger the notification from KVM via sint_ack_notifier
*/
if (!wait_for_sint_ack) {
aio_bh_schedule_oneshot(qemu_get_aio_context(), sint_msg_bh,
sint_route);
}
}
/*
* Post a Hyper-V message to the staging area, for delivery to guest in the
* vcpu thread.
*/
int hyperv_post_msg(HvSintRoute *sint_route, struct hyperv_message *src_msg)
{
HvSintStagedMessage *staged_msg = sint_route->staged_msg;
assert(staged_msg);
/* grab the staging area */
if (qatomic_cmpxchg(&staged_msg->state, HV_STAGED_MSG_FREE,
HV_STAGED_MSG_BUSY) != HV_STAGED_MSG_FREE) {
return -EAGAIN;
}
memcpy(&staged_msg->msg, src_msg, sizeof(*src_msg));
/* hold a reference on sint_route until the callback is finished */
hyperv_sint_route_ref(sint_route);
/* schedule message posting attempt in vcpu thread */
async_run_on_cpu(sint_route->synic->cs, cpu_post_msg,
RUN_ON_CPU_HOST_PTR(sint_route));
return 0;
}
static void sint_ack_handler(EventNotifier *notifier)
{
HvSintRoute *sint_route = container_of(notifier, HvSintRoute,
sint_ack_notifier);
event_notifier_test_and_clear(notifier);
/*
* the guest consumed the previous message so complete the current one with
* -EAGAIN and let the msg originator retry
*/
aio_bh_schedule_oneshot(qemu_get_aio_context(), sint_msg_bh, sint_route);
}
/*
* Set given event flag for a given sint on a given vcpu, and signal the sint.
*/
int hyperv_set_event_flag(HvSintRoute *sint_route, unsigned eventno)
{
int ret;
SynICState *synic = sint_route->synic;
unsigned long *flags, set_mask;
unsigned set_idx;
if (eventno > HV_EVENT_FLAGS_COUNT) {
return -EINVAL;
}
if (!synic->sctl_enabled || !synic->event_page_addr) {
return -ENXIO;
}
set_idx = BIT_WORD(eventno);
set_mask = BIT_MASK(eventno);
flags = synic->event_page->slot[sint_route->sint].flags;
if ((qatomic_fetch_or(&flags[set_idx], set_mask) & set_mask) != set_mask) {
memory_region_set_dirty(&synic->event_page_mr, 0,
sizeof(*synic->event_page));
ret = hyperv_sint_route_set_sint(sint_route);
} else {
ret = 0;
}
return ret;
}
HvSintRoute *hyperv_sint_route_new(uint32_t vp_index, uint32_t sint,
HvSintMsgCb cb, void *cb_data)
{
HvSintRoute *sint_route = NULL;
EventNotifier *ack_notifier = NULL;
int r, gsi;
CPUState *cs;
SynICState *synic;
bool ack_event_initialized = false;
cs = hyperv_find_vcpu(vp_index);
if (!cs) {
return NULL;
}
synic = get_synic(cs);
if (!synic) {
return NULL;
}
sint_route = g_new0(HvSintRoute, 1);
if (!sint_route) {
return NULL;
}
sint_route->synic = synic;
sint_route->sint = sint;
sint_route->refcount = 1;
ack_notifier = cb ? &sint_route->sint_ack_notifier : NULL;
if (ack_notifier) {
sint_route->staged_msg = g_new0(HvSintStagedMessage, 1);
if (!sint_route->staged_msg) {
goto cleanup_err_sint;
}
sint_route->staged_msg->cb = cb;
sint_route->staged_msg->cb_data = cb_data;
r = event_notifier_init(ack_notifier, false);
if (r) {
goto cleanup_err_sint;
}
event_notifier_set_handler(ack_notifier, sint_ack_handler);
ack_event_initialized = true;
}
/* See if we are done or we need to setup a GSI for this SintRoute */
if (!synic->sctl_enabled) {
goto cleanup;
}
/* We need to setup a GSI for this SintRoute */
r = event_notifier_init(&sint_route->sint_set_notifier, false);
if (r) {
goto cleanup_err_sint;
}
gsi = kvm_irqchip_add_hv_sint_route(kvm_state, vp_index, sint);
if (gsi < 0) {
goto cleanup_err_sint_notifier;
}
r = kvm_irqchip_add_irqfd_notifier_gsi(kvm_state,
&sint_route->sint_set_notifier,
ack_notifier, gsi);
if (r) {
goto cleanup_err_irqfd;
}
sint_route->gsi = gsi;
cleanup:
qemu_mutex_lock(&synic->sint_routes_mutex);
QLIST_INSERT_HEAD(&synic->sint_routes, sint_route, link);
qemu_mutex_unlock(&synic->sint_routes_mutex);
return sint_route;
cleanup_err_irqfd:
kvm_irqchip_release_virq(kvm_state, gsi);
cleanup_err_sint_notifier:
event_notifier_cleanup(&sint_route->sint_set_notifier);
cleanup_err_sint:
if (ack_notifier) {
if (ack_event_initialized) {
event_notifier_set_handler(ack_notifier, NULL);
event_notifier_cleanup(ack_notifier);
}
g_free(sint_route->staged_msg);
}
g_free(sint_route);
return NULL;
}
void hyperv_sint_route_ref(HvSintRoute *sint_route)
{
sint_route->refcount++;
}
void hyperv_sint_route_unref(HvSintRoute *sint_route)
{
SynICState *synic;
if (!sint_route) {
return;
}
assert(sint_route->refcount > 0);
if (--sint_route->refcount) {
return;
}
synic = sint_route->synic;
qemu_mutex_lock(&synic->sint_routes_mutex);
QLIST_REMOVE(sint_route, link);
qemu_mutex_unlock(&synic->sint_routes_mutex);
if (sint_route->gsi) {
kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state,
&sint_route->sint_set_notifier,
sint_route->gsi);
kvm_irqchip_release_virq(kvm_state, sint_route->gsi);
event_notifier_cleanup(&sint_route->sint_set_notifier);
}
if (sint_route->staged_msg) {
event_notifier_set_handler(&sint_route->sint_ack_notifier, NULL);
event_notifier_cleanup(&sint_route->sint_ack_notifier);
g_free(sint_route->staged_msg);
}
g_free(sint_route);
}
int hyperv_sint_route_set_sint(HvSintRoute *sint_route)
{
if (!sint_route->gsi) {
return 0;
}
return event_notifier_set(&sint_route->sint_set_notifier);
}
typedef struct MsgHandler {
struct rcu_head rcu;
QLIST_ENTRY(MsgHandler) link;
uint32_t conn_id;
HvMsgHandler handler;
void *data;
} MsgHandler;
typedef struct EventFlagHandler {
struct rcu_head rcu;
QLIST_ENTRY(EventFlagHandler) link;
uint32_t conn_id;
EventNotifier *notifier;
} EventFlagHandler;
static QLIST_HEAD(, MsgHandler) msg_handlers;
static QLIST_HEAD(, EventFlagHandler) event_flag_handlers;
static QemuMutex handlers_mutex;
static void __attribute__((constructor)) hv_init(void)
{
QLIST_INIT(&msg_handlers);
QLIST_INIT(&event_flag_handlers);
qemu_mutex_init(&handlers_mutex);
}
int hyperv_set_msg_handler(uint32_t conn_id, HvMsgHandler handler, void *data)
{
int ret;
MsgHandler *mh;
QEMU_LOCK_GUARD(&handlers_mutex);
QLIST_FOREACH(mh, &msg_handlers, link) {
if (mh->conn_id == conn_id) {
if (handler) {
ret = -EEXIST;
} else {
QLIST_REMOVE_RCU(mh, link);
g_free_rcu(mh, rcu);
ret = 0;
}
return ret;
}
}
if (handler) {
mh = g_new(MsgHandler, 1);
mh->conn_id = conn_id;
mh->handler = handler;
mh->data = data;
QLIST_INSERT_HEAD_RCU(&msg_handlers, mh, link);
ret = 0;
} else {
ret = -ENOENT;
}
return ret;
}
uint16_t hyperv_hcall_post_message(uint64_t param, bool fast)
{
uint16_t ret;
hwaddr len;
struct hyperv_post_message_input *msg;
MsgHandler *mh;
if (fast) {
return HV_STATUS_INVALID_HYPERCALL_CODE;
}
if (param & (__alignof__(*msg) - 1)) {
return HV_STATUS_INVALID_ALIGNMENT;
}
len = sizeof(*msg);
msg = cpu_physical_memory_map(param, &len, 0);
if (len < sizeof(*msg)) {
ret = HV_STATUS_INSUFFICIENT_MEMORY;
goto unmap;
}
if (msg->payload_size > sizeof(msg->payload)) {
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
goto unmap;
}
ret = HV_STATUS_INVALID_CONNECTION_ID;
WITH_RCU_READ_LOCK_GUARD() {
QLIST_FOREACH_RCU(mh, &msg_handlers, link) {
if (mh->conn_id == (msg->connection_id & HV_CONNECTION_ID_MASK)) {
ret = mh->handler(msg, mh->data);
break;
}
}
}
unmap:
cpu_physical_memory_unmap(msg, len, 0, 0);
return ret;
}
static int set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier)
{
int ret;
EventFlagHandler *handler;
QEMU_LOCK_GUARD(&handlers_mutex);
QLIST_FOREACH(handler, &event_flag_handlers, link) {
if (handler->conn_id == conn_id) {
if (notifier) {
ret = -EEXIST;
} else {
QLIST_REMOVE_RCU(handler, link);
g_free_rcu(handler, rcu);
ret = 0;
}
return ret;
}
}
if (notifier) {
handler = g_new(EventFlagHandler, 1);
handler->conn_id = conn_id;
handler->notifier = notifier;
QLIST_INSERT_HEAD_RCU(&event_flag_handlers, handler, link);
ret = 0;
} else {
ret = -ENOENT;
}
return ret;
}
static bool process_event_flags_userspace;
int hyperv_set_event_flag_handler(uint32_t conn_id, EventNotifier *notifier)
{
if (!process_event_flags_userspace &&
!kvm_check_extension(kvm_state, KVM_CAP_HYPERV_EVENTFD)) {
process_event_flags_userspace = true;
warn_report("Hyper-V event signaling is not supported by this kernel; "
"using slower userspace hypercall processing");
}
if (!process_event_flags_userspace) {
struct kvm_hyperv_eventfd hvevfd = {
.conn_id = conn_id,
.fd = notifier ? event_notifier_get_fd(notifier) : -1,
.flags = notifier ? 0 : KVM_HYPERV_EVENTFD_DEASSIGN,
};
return kvm_vm_ioctl(kvm_state, KVM_HYPERV_EVENTFD, &hvevfd);
}
return set_event_flag_handler(conn_id, notifier);
}
uint16_t hyperv_hcall_signal_event(uint64_t param, bool fast)
{
EventFlagHandler *handler;
if (unlikely(!fast)) {
hwaddr addr = param;
if (addr & (__alignof__(addr) - 1)) {
return HV_STATUS_INVALID_ALIGNMENT;
}
param = ldq_phys(&address_space_memory, addr);
}
/*
* Per spec, bits 32-47 contain the extra "flag number". However, we
* have no use for it, and in all known usecases it is zero, so just
* report lookup failure if it isn't.
*/
if (param & 0xffff00000000ULL) {
return HV_STATUS_INVALID_PORT_ID;
}
/* remaining bits are reserved-zero */
if (param & ~HV_CONNECTION_ID_MASK) {
return HV_STATUS_INVALID_HYPERCALL_INPUT;
}
RCU_READ_LOCK_GUARD();
QLIST_FOREACH_RCU(handler, &event_flag_handlers, link) {
if (handler->conn_id == param) {
event_notifier_set(handler->notifier);
return 0;
}
}
return HV_STATUS_INVALID_CONNECTION_ID;
}
static HvSynDbgHandler hv_syndbg_handler;
static void *hv_syndbg_context;
void hyperv_set_syndbg_handler(HvSynDbgHandler handler, void *context)
{
assert(!hv_syndbg_handler);
hv_syndbg_handler = handler;
hv_syndbg_context = context;
}
uint16_t hyperv_hcall_reset_dbg_session(uint64_t outgpa)
{
uint16_t ret;
HvSynDbgMsg msg;
struct hyperv_reset_debug_session_output *reset_dbg_session = NULL;
hwaddr len;
if (!hv_syndbg_handler) {
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
goto cleanup;
}
len = sizeof(*reset_dbg_session);
reset_dbg_session = cpu_physical_memory_map(outgpa, &len, 1);
if (!reset_dbg_session || len < sizeof(*reset_dbg_session)) {
ret = HV_STATUS_INSUFFICIENT_MEMORY;
goto cleanup;
}
msg.type = HV_SYNDBG_MSG_CONNECTION_INFO;
ret = hv_syndbg_handler(hv_syndbg_context, &msg);
if (ret) {
goto cleanup;
}
reset_dbg_session->host_ip = msg.u.connection_info.host_ip;
reset_dbg_session->host_port = msg.u.connection_info.host_port;
/* The following fields are only used as validation for KDVM */
memset(&reset_dbg_session->host_mac, 0,
sizeof(reset_dbg_session->host_mac));
reset_dbg_session->target_ip = msg.u.connection_info.host_ip;
reset_dbg_session->target_port = msg.u.connection_info.host_port;
memset(&reset_dbg_session->target_mac, 0,
sizeof(reset_dbg_session->target_mac));
cleanup:
if (reset_dbg_session) {
cpu_physical_memory_unmap(reset_dbg_session,
sizeof(*reset_dbg_session), 1, len);
}
return ret;
}
uint16_t hyperv_hcall_retreive_dbg_data(uint64_t ingpa, uint64_t outgpa,
bool fast)
{
uint16_t ret;
struct hyperv_retrieve_debug_data_input *debug_data_in = NULL;
struct hyperv_retrieve_debug_data_output *debug_data_out = NULL;
hwaddr in_len, out_len;
HvSynDbgMsg msg;
if (fast || !hv_syndbg_handler) {
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
goto cleanup;
}
in_len = sizeof(*debug_data_in);
debug_data_in = cpu_physical_memory_map(ingpa, &in_len, 0);
if (!debug_data_in || in_len < sizeof(*debug_data_in)) {
ret = HV_STATUS_INSUFFICIENT_MEMORY;
goto cleanup;
}
out_len = sizeof(*debug_data_out);
debug_data_out = cpu_physical_memory_map(outgpa, &out_len, 1);
if (!debug_data_out || out_len < sizeof(*debug_data_out)) {
ret = HV_STATUS_INSUFFICIENT_MEMORY;
goto cleanup;
}
msg.type = HV_SYNDBG_MSG_RECV;
msg.u.recv.buf_gpa = outgpa + sizeof(*debug_data_out);
msg.u.recv.count = TARGET_PAGE_SIZE - sizeof(*debug_data_out);
msg.u.recv.options = debug_data_in->options;
msg.u.recv.timeout = debug_data_in->timeout;
msg.u.recv.is_raw = true;
ret = hv_syndbg_handler(hv_syndbg_context, &msg);
if (ret == HV_STATUS_NO_DATA) {
debug_data_out->retrieved_count = 0;
debug_data_out->remaining_count = debug_data_in->count;
goto cleanup;
} else if (ret != HV_STATUS_SUCCESS) {
goto cleanup;
}
debug_data_out->retrieved_count = msg.u.recv.retrieved_count;
debug_data_out->remaining_count =
debug_data_in->count - msg.u.recv.retrieved_count;
cleanup:
if (debug_data_out) {
cpu_physical_memory_unmap(debug_data_out, sizeof(*debug_data_out), 1,
out_len);
}
if (debug_data_in) {
cpu_physical_memory_unmap(debug_data_in, sizeof(*debug_data_in), 0,
in_len);
}
return ret;
}
uint16_t hyperv_hcall_post_dbg_data(uint64_t ingpa, uint64_t outgpa, bool fast)
{
uint16_t ret;
struct hyperv_post_debug_data_input *post_data_in = NULL;
struct hyperv_post_debug_data_output *post_data_out = NULL;
hwaddr in_len, out_len;
HvSynDbgMsg msg;
if (fast || !hv_syndbg_handler) {
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
goto cleanup;
}
in_len = sizeof(*post_data_in);
post_data_in = cpu_physical_memory_map(ingpa, &in_len, 0);
if (!post_data_in || in_len < sizeof(*post_data_in)) {
ret = HV_STATUS_INSUFFICIENT_MEMORY;
goto cleanup;
}
if (post_data_in->count > TARGET_PAGE_SIZE - sizeof(*post_data_in)) {
ret = HV_STATUS_INVALID_PARAMETER;
goto cleanup;
}
out_len = sizeof(*post_data_out);
post_data_out = cpu_physical_memory_map(outgpa, &out_len, 1);
if (!post_data_out || out_len < sizeof(*post_data_out)) {
ret = HV_STATUS_INSUFFICIENT_MEMORY;
goto cleanup;
}
msg.type = HV_SYNDBG_MSG_SEND;
msg.u.send.buf_gpa = ingpa + sizeof(*post_data_in);
msg.u.send.count = post_data_in->count;
msg.u.send.is_raw = true;
ret = hv_syndbg_handler(hv_syndbg_context, &msg);
if (ret != HV_STATUS_SUCCESS) {
goto cleanup;
}
post_data_out->pending_count = msg.u.send.pending_count;
ret = post_data_out->pending_count ? HV_STATUS_INSUFFICIENT_BUFFERS :
HV_STATUS_SUCCESS;
cleanup:
if (post_data_out) {
cpu_physical_memory_unmap(post_data_out,
sizeof(*post_data_out), 1, out_len);
}
if (post_data_in) {
cpu_physical_memory_unmap(post_data_in,
sizeof(*post_data_in), 0, in_len);
}
return ret;
}
uint32_t hyperv_syndbg_send(uint64_t ingpa, uint32_t count)
{
HvSynDbgMsg msg;
if (!hv_syndbg_handler) {
return HV_SYNDBG_STATUS_INVALID;
}
msg.type = HV_SYNDBG_MSG_SEND;
msg.u.send.buf_gpa = ingpa;
msg.u.send.count = count;
msg.u.send.is_raw = false;
if (hv_syndbg_handler(hv_syndbg_context, &msg)) {
return HV_SYNDBG_STATUS_INVALID;
}
return HV_SYNDBG_STATUS_SEND_SUCCESS;
}
uint32_t hyperv_syndbg_recv(uint64_t ingpa, uint32_t count)
{
uint16_t ret;
HvSynDbgMsg msg;
if (!hv_syndbg_handler) {
return HV_SYNDBG_STATUS_INVALID;
}
msg.type = HV_SYNDBG_MSG_RECV;
msg.u.recv.buf_gpa = ingpa;
msg.u.recv.count = count;
msg.u.recv.options = 0;
msg.u.recv.timeout = 0;
msg.u.recv.is_raw = false;
ret = hv_syndbg_handler(hv_syndbg_context, &msg);
if (ret != HV_STATUS_SUCCESS) {
return 0;
}
return HV_SYNDBG_STATUS_SET_SIZE(HV_SYNDBG_STATUS_RECV_SUCCESS,
msg.u.recv.retrieved_count);
}
void hyperv_syndbg_set_pending_page(uint64_t ingpa)
{
HvSynDbgMsg msg;
if (!hv_syndbg_handler) {
return;
}
msg.type = HV_SYNDBG_MSG_SET_PENDING_PAGE;
msg.u.pending_page.buf_gpa = ingpa;
hv_syndbg_handler(hv_syndbg_context, &msg);
}
uint64_t hyperv_syndbg_query_options(void)
{
HvSynDbgMsg msg;
if (!hv_syndbg_handler) {
return 0;
}
msg.type = HV_SYNDBG_MSG_QUERY_OPTIONS;
if (hv_syndbg_handler(hv_syndbg_context, &msg) != HV_STATUS_SUCCESS) {
return 0;
}
return msg.u.query_options.options;
}
static bool vmbus_recommended_features_enabled;
bool hyperv_are_vmbus_recommended_features_enabled(void)
{
return vmbus_recommended_features_enabled;
}
void hyperv_set_vmbus_recommended_features_enabled(void)
{
vmbus_recommended_features_enabled = true;
}
Reference in New Issue View Git Blame Copy Permalink