[Qemu-devel] uncached memory access in qtest

[Ben Warren]

Hi,

I’m trying to write a unit test to access a fw_cfg device via ACPI memory.  
When I access the memory from qtest using the readx() functions, I get the 
right values.  If I change the contents on the host side, though, then access 
from the guest, the contents are unchanged.  If I register a read callback via 
fw_cfg_add_file_callback(), I see the callback only called once, so it seems to 
me that the guest memory is being cached.  Is there an easy way to flush or 
invalidate the cache, or map a region uncached in the qtest framework?  Or 
maybe do something from the host side?

thanks,
Ben

smime.p7s
Description: S/MIME cryptographic signature