Re: [Xen-devel] question about domU memory mapping

[Xin Zhao <zhaoxin@xxxxxxxxxxxxxx>]

Thanks for your reply!

But I got the virtual address as d0848480 and then got the
corresponding machine address by using virt_to_machine, Is this the right
way to do that?

Is there any restriction on the memeory that is remappable? I mean, can
some memory in DomU un-remappable?

Thanks,

-x


On Wed, 27 Jul 2005, Keir Fraser wrote:

>
> On 27 Jul 2005, at 07:37, Xin Zhao wrote:
>
> > I am trying to map some memory page in DomU kernel space.
> > Specifically, I
> > am trying to map the in-kernel module structure of sunrpc whose
> > address is
> > d0848480 and machine address is 00000480. The aligned page becomes zero
> > (that's weird, I don't know whether that's possible). When I tried to
> > map
> > it into Dom0, I got an error number -14 which means bad address.
> >
> > So my question is:
> > 1. Is this kind memory remappable?
> > 2. If so, what's wrong with this? or what's the right way to do that?
>
> The machine address of that structure is certainly not 0x480. Xen would
> never allocate a page below 1MB to a domain.
>
>   -- Keir
>
>
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>

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