Re: [Xen-devel] QEMU commit 04bf2526ce breaks use of xen-mapcache

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

> Hi,
> 
> Commits 04bf2526ce (exec: use qemu_ram_ptr_length to access guest ram)
> start using qemu_ram_ptr_length() instead of qemu_map_ram_ptr().
> That result in calling xen_map_cache() with lock=true, but this mapping
> is never invalidated.
> So QEMU use more and more RAM until it stop working for a reason or an
> other. (crash if host have little RAM or stop emulating but no crash)
> 
> I don't know if calling xen_invalidate_map_cache_entry() in
> address_space_read_continue() and address_space_write_continue() is the
> right answer.  Is there something better to do ?

I think it's correct for dma to be true... maybe add a lock argument to
qemu_ram_ptr_length, so that make address_space_{read,write}_continue can
pass 0 and everyone else passes 1?

Paolo

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