On 03/02/2014 08:31 AM, Paolo Bonzini wrote: > Il 01/03/2014 13:30, Alexey Kardashevskiy ha scritto: >>> > >>> > Corrupted DMA buffer is 0x e00000 -- 0x7f15c313f000. >>> > The e1000 packet is at 0x12ffac2 -- 0x7f15c313eac2. >>> > >>> > (0x7f15c313f000 - 0x7f15c313eac2) = 0x53e which is less than 0x5aa and >>> > (0x5aa - 0x53e) = 0x6c bytes get corrupted. >>> > >>> > I see here buffer overrun from e1000 and I suspect that your patch just >>> > hides this problem. What did I miss? >> >> Ping, anyone? > > You missed that this is a Xen-specific problem. Xen maps things a page at > a time, so address_space_map/unmap/rw can operate only on a small part of > the requested [address, address+length) range.
Sorry, I am not following you here. Does KVM map things not page-aligned? > So there is no overrun in e1000. The patch is incomplete, because it fixes > only address_space_rw, but the problem is indeed in exec.c. So you know what the problem is? We have a bunch of bugreports against e1000 breaking things... -- Alexey
