Re: [Xen-devel] [PATCH v2] tools: libxc: flush data cache after loading images into guest memory

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 12/13/2013 12:53 PM, Ian Campbell wrote:
> > > > Unfortunately Linux doesn't provide any syscall to call this function
> > > > for ARMv7 and it's not possible to call cache instruction from
> > > > userspace. What we could do is:
> > > >       - Use the "flags" parameters of cacheflush syscall and call a
> > > > function which DCCMVAC (for instance __cpuc_flush_dcache_area)
> > > >       - Extend privcmd to have a flush cache ioctl
> > > Personally I think the first is nicer, but ultimately we need input from
> > > l-a-k on this one and would be happy with either.
> > I agree. Can you try to come up with such a patch?
There is 2 functions in kernel space to flush cache PoC:
  - flush_kern_dcache_area
  - dma_flush_range

I'm not sure if one of these are suitable to expose to user space.

> I think Julien was going to investigate, but if says not I'll take a
> stab at it.
I will try to do and send a patch tomorrow.

--
Julien Grall

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