Re: [RFC 0/4] Add a 'in_mmio' device flag to avoid the DMA to MMIO

[Jason Wang]

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?

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(-)