* Questions about the mapping from gpfn to mfn when live migration
[not found] <787044279.1400842.1370151885282.JavaMail.root@vmware.com>
@ 2013-06-02 6:19 ` Kai Luo
2013-06-03 9:49 ` Andrew Cooper
0 siblings, 1 reply; 2+ messages in thread
From: Kai Luo @ 2013-06-02 6:19 UTC (permalink / raw)
To: xen-devel
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Hi everyone:
I am reading code of live migration process of hvm domain now.My question is that I can't find the transformation position that transform hvm domain‘s gpfn to mfn.That is,the method ,in file xc_linux_osdep.c, linux_privcmd_map_foreign_bulk( xc_interface *xch, xc_osdep_handle h, uint32_t dom, int prot, const xen_pfn_t *arr, int *err, unsigned int num) ,the list of xen_pfn_t contains the list of guest's mfns(gpfns in xen),for para-virtualization guests they are thransformed by the pfn_to_mfn() before assignment(in xc_domain_save()),for hvm guests however,I can not find a similar conversion process,they are directly conveyed to the dom's kernel directly without any transformation.So I continued to follow the process,finding the following key functions:
privcmd_ioctl (struct file *file, unsigned int cmd, unsigned long data)
->privcmd_ioctl_mmap_batch(udata, 2)
->-> traverse_pages(mmapcmd.num, sizeof(struct privcmd_mmap_entry), &pagelist, mmap_mfn_range, &state);
Still no clue for the thransformation process,could you give any sugguestions?
My second question is that is it possible that I give a list of hvm's mfns(not gpfns) and then get the contents held in memory in dom0?Does xen have any function of this kind?
Thank you all!
Jone
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* Re: Questions about the mapping from gpfn to mfn when live migration
2013-06-02 6:19 ` Questions about the mapping from gpfn to mfn when live migration Kai Luo
@ 2013-06-03 9:49 ` Andrew Cooper
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Cooper @ 2013-06-03 9:49 UTC (permalink / raw)
To: Kai Luo; +Cc: xen-devel
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On 02/06/13 07:19, Kai Luo wrote:
> Hi everyone:
> I am reading code of live migration process of hvm domain now.My
> question is that I can't find the transformation position that
> transform hvm domain‘s gpfn to mfn.That is,the method ,in file
> xc_linux_osdep.c,linux_privcmd_map_foreign_bulk(xc_interface *xch,
> xc_osdep_handle h,uint32_t dom, int prot,const xen_pfn_t *arr, int
> *err, unsigned int num),the list of xen_pfn_t contains the list of
> guest's mfns(gpfns in xen),for para-virtualization guests they are
> thransformed by the pfn_to_mfn() before assignment(in
> xc_domain_save()),for hvm guests however,I can not find a similar
> conversion process,they are directly conveyed to the dom's kernel
> directly without any transformation.So I continued to follow the
> process,finding the following key functions:
> privcmd_ioctl(struct file *file,unsigned int cmd, unsigned long data)
> ->privcmd_ioctl_mmap_batch(udata, 2)
> ->-> traverse_pages(mmapcmd.num, sizeof(struct
> privcmd_mmap_entry),&pagelist,mmap_mfn_range, &state);
> Still no clue for the thransformation process,could you give any
> sugguestions?
> My second question is that is it possible that I give a list of
> hvm's mfns(not gpfns) and then get the contents held in memory in
> dom0?Does xen have any function of this kind?
> Thank you all!
> Jone
Xen does the transformation.
All mapping functions take "Guest physical addresses", i.e. the values a
guest puts in their pagetables. For PV guests, this is MFNs but for HVM
guests, only Xen can read the EPT/NPT pagetables to transform guest
physical into host physical.
I am not aware of any supported interface which would allow dom0 to map
raw mfns, nor should there be. What is the problem you are trying to
solve by doing this?
~Andrew
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2013-06-02 6:19 ` Questions about the mapping from gpfn to mfn when live migration Kai Luo
2013-06-03 9:49 ` Andrew Cooper
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