On Fri, Sep 04, 2020 at 02:18:37PM +0000, Mircea CIRJALIU - MELIU wrote:
quoted
This seems really sketchy, get_user_pages is sensitive to the VMA, what
happens when VMA flags are different/etc?
A debugger shouldn't complain if a portion of the debuggee is read-only,
just overwrite the data.
At this point the kernel API here is so incredibly limited you may as
well use a memfd for passing the shared address space instead of
trying to do and maintain this complexity.
Your use case is only qemu, so what is the problem to replace the
allocator backing VM memory in userspace? Other people have been
talking about doing a memfd already for different reasons - and memfd
can already be shared as this scheme desires.
Jason