Re: [Xen-devel] address mapping between domains

[Christopher Clark <Christopher.Clark@xxxxxxxxxxxx>]

much more likely that a privileged domain should have write access to an
unpriv domain's memory than the other way around, don't you think?

update_va_mapping:

vaddr: virtual address to be updated
val: new PTE value including machine address to stick in there
flags: whether you thump the TLB or not (or reload LDT too, by the looks
of it)

c.


On Mon, 2005-03-07 at 15:59, Zhiyi Huang wrote:
> Hi, I am trying to figure out how address mapping is done for zero-copy I/O. 
> Is it allowed by the hypervisor that a page allocated to domain0 (the 
> privileged domain) is mapped to the address space of a domainU? So far it 
> seems to be the other way around: a page from a domainU is mapped to the 
> address space of domain0 when I/O requests are sent to domain0.
> 
> Another question is about the hypercall: update_va_mapping. It has three 
> arguments: vaddr, val, flags. Can anyone kindly explain the meaning of them 
> and how they are used in the hypercall? Actually I am puzzled why there is no 
> machine page id as an argument, since the virtual address should be mapped to 
> a machine page anyway when the page table is updated.
> 
> Thanks a lot.
> 
> --------------------------
> Zhiyi from EPFL Switzerland
> 
> 
> 
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