On Wed, Jan 31, 2018 at 05:28:35PM +0800, Peter Xu wrote: > Hi, Michael and the list, > > I observed this on windows 8 enterprise guests, when doing memory ballooning: > > 23892@1517298572.328354:virtio_balloon_to_target balloon target: 0x80000000 > num_pages: 524288 > 23892@1517298638.542819:virtio_balloon_get_config num_pages: 524288 actual: 0 > 23892@1517298638.542974:virtio_balloon_handle_output section name: pc.ram > gpa: 0x174604000 > 23892@1517298638.543059:virtio_balloon_handle_output section name: pc.ram > gpa: 0x0 > 23892@1517298638.543135:virtio_balloon_handle_output section name: pc.ram > gpa: 0x17460a000 > 23892@1517298638.543140:virtio_balloon_handle_output section name: pc.ram > gpa: 0x0 > 23892@1517298638.543143:virtio_balloon_handle_output section name: pc.ram > gpa: 0x17460b000 > 23892@1517298638.543146:virtio_balloon_handle_output section name: pc.ram > gpa: 0x0 > 23892@1517298638.543148:virtio_balloon_handle_output section name: pc.ram > gpa: 0x17460c000 > 23892@1517298638.543152:virtio_balloon_handle_output section name: pc.ram > gpa: 0x0 > 23892@1517298638.543154:virtio_balloon_handle_output section name: pc.ram > gpa: 0x17460d000 > 23892@1517298638.543159:virtio_balloon_handle_output section name: pc.ram > gpa: 0x0 > 23892@1517298638.543162:virtio_balloon_handle_output section name: pc.ram > gpa: 0x17460e000 > 23892@1517298638.543165:virtio_balloon_handle_output section name: pc.ram > gpa: 0x0 > 23892@1517298638.543167:virtio_balloon_handle_output section name: pc.ram > gpa: 0x17460f000 > 23892@1517298638.543170:virtio_balloon_handle_output section name: pc.ram > gpa: 0x0 > ... > > I think it's very possible that these zero addresses (please let me > know what the first 4K page is used for if anyone knows, since IIUC > that's what we throw away now) are half of the 64bit PFN. Or say, not > sure whether this means a windows guest driver bug that is using > 64bits for PFN rather than 32bits (and I suppose the protocol is using > 32bit for PFNs). > > Michael, do you know what to do with this? > > Thanks,
PFN is GPA>>12. Do you have more than 1<<44 bytes of memory in this VM then? > -- > Peter Xu
