Here's my shot at fixing dma-reentracy issues. This patch adds a flag to the DeviceState, which is set/checked when we call an accessor associated with the device's IO MRs.
The problem, in short, as I understand it: For the vast majority of cases, we want to prevent a device from accessing it's own PIO/MMIO regions over DMA. V2: Try to fix reentrancies initiated by DMA accesses in BHs Cc: Philippe Mathieu-Daudé <[email protected]> Cc: Mauro Matteo Cascella <[email protected]> Cc: Qiuhao Li <[email protected]> Cc: Peter Xu <[email protected]> Cc: Jason Wang <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Gerd Hoffmann <[email protected]> Cc: Peter Maydell <[email protected]> Cc: Li Qiang <[email protected]> Cc: Thomas Huth <[email protected]> Cc: Laurent Vivier <[email protected]> Cc: Bandan Das <[email protected]> Cc: Edgar E. Iglesias <[email protected]> Cc: Darren Kenny <[email protected]> Cc: Bin Meng <[email protected]> Cc: Paolo Bonzini <[email protected]> Cc: Stefan Hajnoczi <[email protected]> Alexander Bulekov (2): memory: fix dma-reentrancy issues at the MMIO level memory: set engaged_in_io when a device calls DMA APIs include/hw/pci/pci.h | 6 +++++- include/hw/qdev-core.h | 1 + softmmu/dma-helpers.c | 2 ++ softmmu/memory.c | 15 +++++++++++++++ softmmu/trace-events | 1 + 5 files changed, 24 insertions(+), 1 deletion(-) -- 2.33.0
