On Mon, Aug 13, Jan Beulich wrote: > And hence the consideration of mapping in an all zeros page > instead. This is because of the way __hvmemul_read() / > __hvm_copy() work: The latter doesn't tell its caller how many > bytes it was able to read, and hence the former considers the > entire range MMIO (and forwards the request for emulation). > Of course all of this is an issue only because > hvmemul_virtual_to_linear() sees no need to split the request > at the page boundary, due to the balloon driver having left in > place the mapping of the ballooned out page.
Should perhaps __hvm_copy detect the fault and copy 0xf for the unavailable page into 'buf', and finally return success? Clearly something must be done at the Xen level. Olaf
signature.asc
Description: PGP signature
_______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
