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Kernel: Use fewer supervisor pages in VirtIOQueues

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This commit is contained in:
Sahan Fernando 2021-06-22 00:51:47 +10:00 • committed by Andreas Kling
parent 4f0a75224c
commit bd5b1d1413
1 changed files with 5 additions and 1 deletions
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6
Kernel/VirtIO/VirtIOQueue.cpp
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@ -17,7 +17,11 @@ VirtIOQueue::VirtIOQueue(u16 queue_size, u16 notify_offset)
size_t size_of_descriptors = sizeof(VirtIOQueueDescriptor) * queue_size;
size_t size_of_driver = sizeof(VirtIOQueueDriver) + queue_size * sizeof(u16);
size_t size_of_device = sizeof(VirtIOQueueDevice) + queue_size * sizeof(VirtIOQueueDeviceItem);
m_queue_region = MM.allocate_contiguous_kernel_region(page_round_up(size_of_descriptors + size_of_driver + size_of_device), "VirtIO Queue", Region::Access::Read | Region::Access::Write);
auto queue_region_size = page_round_up(size_of_descriptors + size_of_driver + size_of_device);
if (queue_region_size <= PAGE_SIZE)
m_queue_region = MM.allocate_kernel_region(queue_region_size, "VirtIO Queue", Region::Access::Read | Region::Access::Write);
else
m_queue_region = MM.allocate_contiguous_kernel_region(queue_region_size, "VirtIO Queue", Region::Access::Read | Region::Access::Write);
VERIFY(m_queue_region);
// TODO: ensure alignment!!!
u8* ptr = m_queue_region->vaddr().as_ptr();