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 <phi...@redhat.com> Cc: Mauro Matteo Cascella <mcasc...@redhat.com> Cc: Qiuhao Li <qiuhao...@outlook.com> Cc: Peter Xu <pet...@redhat.com> Cc: Jason Wang <jasow...@redhat.com> Cc: David Hildenbrand <da...@redhat.com> Cc: Gerd Hoffmann <kra...@redhat.com> Cc: Peter Maydell <peter.mayd...@linaro.org> Cc: Li Qiang <liq...@gmail.com> Cc: Thomas Huth <th...@redhat.com> Cc: Laurent Vivier <lviv...@redhat.com> Cc: Bandan Das <b...@redhat.com> Cc: Edgar E. Iglesias <edgar.igles...@gmail.com> Cc: Darren Kenny <darren.ke...@oracle.com> Cc: Bin Meng <bin.m...@windriver.com> Cc: Paolo Bonzini <pbonz...@redhat.com> Cc: Stefan Hajnoczi <stefa...@redhat.com> 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
