Il 08/11/2013 16:08, Marcel Apfelbaum ha scritto: > Actually, as I see, the default behavior of "system" memory region > is to use unassigned_mem_ops that has valid.accepts method returning > false (no read/write methods). I don't see that read all-ones/ignore > writes is implemented.
Right, it's read-all-zeroes (see unassigned_mem_read). It was read-all-ones for a brief time, then it got changed back to read-all-zeroes. > This was the main reason I submitted this patch. I had *no* clue that > it would impact so much the system... Yeah, it's not your fault. But it should have been held back until 1.8. Do you agree with reverting it? > I still think the patch is needed ans the guests will benefit from > more accurate PCI spec emulation. Only buggy guests :) but yes, I agree it's a good thing to have. Paolo
