Re: [kvmarm] [PATCH v10 07/14] KVM: ARM: Memory virtualization setup

[Avi Kivity <avi@redhat.com>]

On 08/19/2012 12:38 PM, Peter Maydell wrote:
> On 19 August 2012 05:34, Christoffer Dall <c.dall@virtualopensystems.com> wrote:
>> On Thu, Aug 16, 2012 at 2:25 PM, Alexander Graf <agraf@suse.de> wrote:
>>> A single hva can have multiple gpas mapped, no? At least that's what I gathered
>>> from the discussion about my attempt to a function similar to this :).
> 
>> I don't think this is the case for ARM, can you provide an example? We
>> use gfn_to_pfn_prot and only allow user memory regions. What you
>> suggest would be multiple physical addresses pointing to the same
>> memory bank, I don't think that makes any sense on ARM hardware, for
>> x86 and PPC I don't know.
> 
> I don't know what an hva is,

host virtual address

(see Documentation/virtual/kvm/mmu.txt for more TLAs in this area).

 but yes, ARM boards can have the same
> block of RAM aliased into multiple places in the physical address space.
> (we don't currently bother to implement the aliases in qemu's vexpress-a15
> though because it's a bunch of mappings of the low 2GB into high
> addresses mostly intended to let you test LPAE code without having to
> put lots of RAM on the hardware).

Even if it weren't common, the API allows it, so we must behave sensibly.

-- 
error compiling committee.c: too many arguments to function