Re: [PATCH 1/1] Remove flatview_simplify()

[Richard Henderson]

On 3/29/21 6:14 AM, FelixCuioc wrote:

Flatview_simplify() can merge many small memory ranges
into a large one and contains EHCI dma buffers.
For example,the merged range maybe0xc0000-0xbfffffff.
When seabios write PAM register to change the properties
of part of the merged range from RW to readonly,
this action cause the merged IOVA mapping will be
unmapped.But EHCI device still send DMA cycles
and then IOMMU blocks the DMA cycles of EHCI device.

You've described the problem, and it is quite obviously *not* in memory.c.


r~