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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



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