Jason Wang <jasow...@redhat.com> 于2020年9月9日周三 上午10:17写道： > > > On 2020/9/9 上午12:41, Li Qiang wrote: > > Currently the qemu device fuzzer find some DMA to MMIO issue. If the > > device handling MMIO currently trigger a DMA which the address is MMIO, > > this will reenter the device MMIO handler. As some of the device doesn't > > consider this it will sometimes crash the qemu. > > > > This patch tries to solve this by adding a per-device flag 'in_mmio'. > > When the memory core dispatch MMIO it will check/set this flag and when > > it leaves it will clean this flag. > > > What's the plan for fixing the irq issues pointed out by Peter? >
Just have a basic idea. Just like this we can add a per-device flag, 'in_mmio' or 'in_emulation' or some other names. The device need solve the irq handler/mmio and anything other reenter issue by themself or they can just check/set/clean this flag. This way we may can define a principle which Peter mentioned that the device emulation should obey. Thanks, Li Qiang > Thanks > > > > > > > > Li Qiang (4): > > memory: add memory_region_init_io_with_dev interface > > memory: avoid reenter the device's MMIO handler while processing MMIO > > e1000e: use the new memory_region_init_io_with_dev interface > > hcd-xhci: use the new memory_region_init_io_with_dev interface > > > > hw/net/e1000e.c | 8 ++++---- > > hw/usb/hcd-xhci.c | 25 ++++++++++++++--------- > > include/exec/memory.h | 9 +++++++++ > > include/hw/qdev-core.h | 1 + > > softmmu/memory.c | 46 +++++++++++++++++++++++++++++++++++++++--- > > 5 files changed, 72 insertions(+), 17 deletions(-) > > >
