[ofw] RE: [RFC] [PATCH 7/12] winverbs: implement IWVProtectionDomain

[Sean Hefty]

>Userspace WinVerb implementation for protection domains, address
>handles, and memory windows.  Most calls are implemented, except
>for memory registration, which requires more thought.

I've implemented memory registration as follows.  Note that proposed WV API is
modified slightly to be more efficient.

STDMETHOD(RegisterMemory)(
	THIS_
	__in_bcount(BufferLength) const VOID* pBuffer,
	__in SIZE_T BufferLength,
	__in DWORD AccessFlags,
	__in OVERLAPPED* pOverlapped,
	__out WV_MEMORY_KEYS* pKeys
	) PURE;

typedef struct _WV_MEMORY_KEYS
{
	UINT32			Lkey;
	UINT32			Rkey;

}	WV_MEMORY_KEYS;

// User must call PD:Release() on asynchronous failure or
// after DeregisterMemory() completes.
STDMETHODIMP CWVProtectionDomain::
RegisterMemory(const VOID* pBuffer, SIZE_T BufferLength, DWORD AccessFlags,
		   OVERLAPPED* pOverlapped, WV_MEMORY_KEYS *pKeys)
{
	WV_IO_MEMORY_REGISTER	reg;
	DWORD				bytes;
	HRESULT			hr;

	AddRef();
	reg.Id = m_Id;
	reg.Address = (UINT64) (ULONG_PTR) pBuffer;
	reg.BufferLength = BufferLength;
	reg.AccessFlags = AccessFlags;
	reg.Reserved = 0;

	if (DeviceIoControl(m_hFile, WV_IOCTL_MEMORY_REGISTER, &reg, sizeof reg,
				pKeys, sizeof WV_MEMORY_KEYS, &bytes,
pOverlapped)) {
		hr = WV_SUCCESS;
	} else {
		hr = HRESULT_FROM_WIN32(GetLastError());
		Release();
	}

	return hr;
}

// User must call PD::Release() after operation completes.
STDMETHODIMP CWVProtectionDomain::
DeregisterMemory(UINT32 Lkey, OVERLAPPED* pOverlapped)
{
	WV_IO_ID	id;
	DWORD		bytes;
	HRESULT		hr;

	id.Id = m_Id;
	id.Data = Lkey;
	hr = DeviceIoControl(m_hFile, WV_IOCTL_MEMORY_DEREGISTER, &id, sizeof
id,
				 NULL, 0, &bytes, pOverlapped) ?
				 WV_SUCCESS :
HRESULT_FROM_WIN32(GetLastError());
	return hr;
}