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[host] Update IVSHMEM class to support incoming driver version

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This commit is contained in:
Geoffrey McRae 2017-12-28 15:40:51 +11:00
parent 6a6e53f728
commit e09d7f0ad0
1 changed files with 18 additions and 1 deletions
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19
host/IVSHMEM.cpp
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@ -191,9 +191,26 @@ void * IVSHMEM::GetMemory()
if (m_gotMemory) if (m_gotMemory)
return m_memory; return m_memory;
// this if define can be removed later once everyone is un the latest version
// old versions of the IVSHMEM driver ignore the input argument, as such this
// is completely backwards compatible
#if defined(IVSHMEM_CACHE_WRITECOMBINED)
IVSHMEM_MMAP_CONFIG config;
config.cacheMode = IVSHMEM_CACHE_WRITECOMBINED;
#endif
IVSHMEM_MMAP map; IVSHMEM_MMAP map;
ZeroMemory(&map, sizeof(IVSHMEM_MMAP)); ZeroMemory(&map, sizeof(IVSHMEM_MMAP));
if (!DeviceIoControl(m_handle, IOCTL_IVSHMEM_REQUEST_MMAP, NULL, 0, &map, sizeof(IVSHMEM_MMAP), NULL, NULL)) if (!DeviceIoControl(
m_handle,
IOCTL_IVSHMEM_REQUEST_MMAP,
#if defined(IVSHMEM_CACHE_WRITECOMBINED)
&config, sizeof(IVSHMEM_MMAP_CONFIG),
#else
NULL , 0,
#endif
&map , sizeof(IVSHMEM_MMAP ),
NULL, NULL))
{ {
DEBUG_ERROR("DeviceIoControl Failed: %d", (int)GetLastError()); DEBUG_ERROR("DeviceIoControl Failed: %d", (int)GetLastError());
return NULL; return NULL;