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Re: [Qemu-devel] Windows balloon driver PFN issue
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] Windows balloon driver PFN issue |
Date: |
Wed, 31 Jan 2018 16:03:12 +0200 |
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:
>
> address@hidden:virtio_balloon_to_target balloon target: 0x80000000 num_pages:
> 524288
> address@hidden:virtio_balloon_get_config num_pages: 524288 actual: 0
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa:
> 0x174604000
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa: 0x0
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa:
> 0x17460a000
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa: 0x0
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa:
> 0x17460b000
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa: 0x0
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa:
> 0x17460c000
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa: 0x0
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa:
> 0x17460d000
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa: 0x0
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa:
> 0x17460e000
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa: 0x0
> address@hidden:virtio_balloon_handle_output section name: pc.ram gpa:
> 0x17460f000
> address@hidden: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