DECLSPEC_NOINLINE
NTSTATUS
IoctlEvtchnNotify(
__in PXENIFACE_FDO Fdo,
__in PVOID Buffer,
__in ULONG InLen,
__in ULONG OutLen,
__in PFILE_OBJECT FileObject
)
{
NTSTATUS status;
PXENIFACE_EVTCHN_NOTIFY_IN In = Buffer;
status = STATUS_INVALID_BUFFER_SIZE;
if (InLen != sizeof(XENIFACE_EVTCHN_NOTIFY_IN) ||
OutLen != 0) {
goto fail1;
}
#if DBG
XenIfaceDebugPrint(INFO, "> LocalPort %d, FO %p\n", In->LocalPort, FileObject);
#endif
return EvtchnNotify(Fdo, In->LocalPort, FileObject);
fail1:
XenIfaceDebugPrint(ERROR, "Fail1 (%08x)\n", status);
return status;
}
DECLSPEC_NOINLINE
NTSTATUS
IoctlEvtchnUnmask(
__in PXENIFACE_FDO Fdo,
__in PVOID Buffer,
__in ULONG InLen,
__in ULONG OutLen,
__in PFILE_OBJECT FileObject
)
{
NTSTATUS status;
PXENIFACE_EVTCHN_UNMASK_IN In = Buffer;
PXENIFACE_EVTCHN_CONTEXT Context;
KIRQL Irql;
status = STATUS_INVALID_BUFFER_SIZE;
if (InLen != sizeof(XENIFACE_EVTCHN_UNMASK_IN) ||
OutLen != 0) {
goto fail1;
}
XenIfaceDebugPrint(TRACE, "> LocalPort %d, FO %p\n", In->LocalPort, FileObject);
KeAcquireSpinLock(&Fdo->EvtchnLock, &Irql);
Context = EvtchnFindChannel(Fdo, In->LocalPort, FileObject);
status = STATUS_INVALID_PARAMETER;
if (Context == NULL)
goto fail2;
XENBUS_EVTCHN(Unmask,
&Fdo->EvtchnInterface,
Context->Channel,
FALSE);
KeReleaseSpinLock(&Fdo->EvtchnLock, Irql);
return STATUS_SUCCESS;
fail2:
XenIfaceDebugPrint(ERROR, "Fail2\n");
KeReleaseSpinLock(&Fdo->EvtchnLock, Irql);
fail1:
XenIfaceDebugPrint(ERROR, "Fail1 (%08x)\n", status);
return status;
}
_IRQL_requires_same_
static DECLSPEC_NOINLINE
BOOLEAN
EvtchnInterruptHandler(
__in PKINTERRUPT Interrupt,
__in_opt PVOID Argument
)
{
PXENIFACE_EVTCHN_CONTEXT Context = Argument;
PROCESSOR_NUMBER ProcNumber;
ULONG ProcIndex;
UNREFERENCED_PARAMETER(Interrupt);
ASSERT(Context != NULL);
KeGetCurrentProcessorNumberEx(&ProcNumber);
ProcIndex = KeGetProcessorIndexFromNumber(&ProcNumber);
if (!KeInsertQueueDpc(&Context->Dpc, NULL, NULL)) {
XenIfaceDebugPrint(TRACE, "NOT INSERTED: Context %p, Port %lu, FO %p, Cpu %lu\n",
Context, Context->LocalPort, Context->FileObject, ProcIndex);
}
return TRUE;
}
DECLSPEC_NOINLINE
NTSTATUS
EvtchnNotify(
__in PXENIFACE_FDO Fdo,
__in ULONG LocalPort,
__in_opt PFILE_OBJECT FileObject
)
{
NTSTATUS status;
PXENIFACE_EVTCHN_CONTEXT Context;
KIRQL Irql;
KeAcquireSpinLock(&Fdo->EvtchnLock, &Irql);
Context = EvtchnFindChannel(Fdo, LocalPort, FileObject);
status = STATUS_NOT_FOUND;
if (Context == NULL)
goto fail1;
XENBUS_EVTCHN(Send,
&Fdo->EvtchnInterface,
Context->Channel);
KeReleaseSpinLock(&Fdo->EvtchnLock, Irql);
return STATUS_SUCCESS;
fail1:
XenIfaceDebugPrint(ERROR, "Fail1 (%08x)\n", status);
KeReleaseSpinLock(&Fdo->EvtchnLock, Irql);
return status;
}
DECLSPEC_NOINLINE
NTSTATUS
IoctlEvtchnClose(
__in PXENIFACE_FDO Fdo,
__in PVOID Buffer,
__in ULONG InLen,
__in ULONG OutLen,
__in PFILE_OBJECT FileObject
)
{
NTSTATUS status;
PXENIFACE_EVTCHN_CLOSE_IN In = Buffer;
PXENIFACE_EVTCHN_CONTEXT Context;
KIRQL Irql;
status = STATUS_INVALID_BUFFER_SIZE;
if (InLen != sizeof(XENIFACE_EVTCHN_CLOSE_IN) ||
OutLen != 0) {
goto fail1;
}
XenIfaceDebugPrint(TRACE, "> LocalPort %lu, FO %p\n", In->LocalPort, FileObject);
KeAcquireSpinLock(&Fdo->EvtchnLock, &Irql);
status = STATUS_NOT_FOUND;
Context = EvtchnFindChannel(Fdo, In->LocalPort, FileObject);
if (Context == NULL)
goto fail2;
RemoveEntryList(&Context->Entry);
KeReleaseSpinLock(&Fdo->EvtchnLock, Irql);
EvtchnFree(Fdo, Context);
return STATUS_SUCCESS;
fail2:
XenIfaceDebugPrint(ERROR, "Fail2\n");
KeReleaseSpinLock(&Fdo->EvtchnLock, Irql);
fail1:
XenIfaceDebugPrint(ERROR, "Fail1 (%08x)\n", status);
return status;
}
_IRQL_requires_same_
static DECLSPEC_NOINLINE
BOOLEAN
EvtchnInterruptHandler(
__in PKINTERRUPT Interrupt,
__in_opt PVOID Argument
)
{
PXENIFACE_EVTCHN_CONTEXT Context = Argument;
UNREFERENCED_PARAMETER(Interrupt);
ASSERT(Context != NULL);
if (!KeInsertQueueDpc(&Context->Dpc, NULL, NULL)) {
XenIfaceDebugPrint(TRACE, "NOT INSERTED: Context %p, Port %lu, FO %p\n",
Context, Context->LocalPort, Context->FileObject);
}
return TRUE;
}
VOID
EvtchnFree(
__in PXENIFACE_FDO Fdo,
__inout PXENIFACE_EVTCHN_CONTEXT Context
)
{
ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL);
XenIfaceDebugPrint(TRACE, "Context %p, LocalPort %d, FO %p\n",
Context, Context->LocalPort, Context->FileObject);
XENBUS_EVTCHN(Close,
&Fdo->EvtchnInterface,
Context->Channel);
// There may still be a pending event at this time.
// Wait for our DPCs to complete.
KeFlushQueuedDpcs();
ObDereferenceObject(Context->Event);
RtlZeroMemory(Context, sizeof(XENIFACE_EVTCHN_CONTEXT));
ExFreePoolWithTag(Context, XENIFACE_POOL_TAG);
}
DECLSPEC_NOINLINE
NTSTATUS
IoctlEvtchnBindInterdomain(
__in PXENIFACE_FDO Fdo,
__in PVOID Buffer,
__in ULONG InLen,
__in ULONG OutLen,
__in PFILE_OBJECT FileObject,
__out PULONG_PTR Info
)
{
NTSTATUS status;
PXENIFACE_EVTCHN_BIND_INTERDOMAIN_IN In = Buffer;
PXENIFACE_EVTCHN_BIND_INTERDOMAIN_OUT Out = Buffer;
PXENIFACE_EVTCHN_CONTEXT Context;
status = STATUS_INVALID_BUFFER_SIZE;
if (InLen != sizeof(XENIFACE_EVTCHN_BIND_INTERDOMAIN_IN) ||
OutLen != sizeof(XENIFACE_EVTCHN_BIND_INTERDOMAIN_OUT)) {
goto fail1;
}
status = STATUS_NO_MEMORY;
Context = ExAllocatePoolWithTag(NonPagedPool, sizeof(XENIFACE_EVTCHN_CONTEXT), XENIFACE_POOL_TAG);
if (Context == NULL)
goto fail2;
RtlZeroMemory(Context, sizeof(XENIFACE_EVTCHN_CONTEXT));
Context->FileObject = FileObject;
XenIfaceDebugPrint(TRACE, "> RemoteDomain %d, RemotePort %lu, Mask %d, FO %p\n",
In->RemoteDomain, In->RemotePort, In->Mask, FileObject);
status = ObReferenceObjectByHandle(In->Event,
EVENT_MODIFY_STATE,
*ExEventObjectType,
UserMode,
&Context->Event,
NULL);
if (!NT_SUCCESS(status))
goto fail3;
KeInitializeDpc(&Context->Dpc, EvtchnNotificationDpc, Context);
status = STATUS_UNSUCCESSFUL;
Context->Channel = XENBUS_EVTCHN(Open,
&Fdo->EvtchnInterface,
XENBUS_EVTCHN_TYPE_INTER_DOMAIN,
EvtchnInterruptHandler,
Context,
In->RemoteDomain,
In->RemotePort,
TRUE);
if (Context->Channel == NULL)
goto fail4;
Context->LocalPort = XENBUS_EVTCHN(GetPort,
&Fdo->EvtchnInterface,
Context->Channel);
Context->Fdo = Fdo;
ExInterlockedInsertTailList(&Fdo->EvtchnList, &Context->Entry, &Fdo->EvtchnLock);
Out->LocalPort = Context->LocalPort;
*Info = sizeof(XENIFACE_EVTCHN_BIND_INTERDOMAIN_OUT);
if (!In->Mask) {
XENBUS_EVTCHN(Unmask,
&Fdo->EvtchnInterface,
Context->Channel,
FALSE);
}
XenIfaceDebugPrint(TRACE, "< LocalPort %lu, Context %p\n", Context->LocalPort, Context);
return STATUS_SUCCESS;
fail4:
XenIfaceDebugPrint(ERROR, "Fail4\n");
ObDereferenceObject(Context->Event);
fail3:
XenIfaceDebugPrint(ERROR, "Fail3\n");
RtlZeroMemory(Context, sizeof(XENIFACE_EVTCHN_CONTEXT));
ExFreePoolWithTag(Context, XENIFACE_POOL_TAG);
fail2:
XenIfaceDebugPrint(ERROR, "Fail2\n");
fail1:
XenIfaceDebugPrint(ERROR, "Fail1 (%08x)\n", status);
return status;
}
