Re: A question about KVM_SET_MEMORY_REGION ioctl

[Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

On Thu, 2007-11-15 at 23:21 +0800, Zhang, Xiantao wrote:
> Currently, KVM_SET_MEMORY_REGION ioctl is put under arch, but its
> implementation is in common code . From code logic, it seems very
> strange.  Maybe I missed some threads about its discuss, who can tell me
> the story ? Thanks a lot! :)
> Xiantao

kvm x86 have 2 ways to create memory
one old way:
allocate the memory inside the kernel
one new way:
allocate the memory inside userspace and send a address to the kernel 

the ioctl that call to allocate memory inside the kernel is:
KVM_SET_MEMORY_REGION
and the one that allocate the memory in userspace is:
KVM_SET_USER_MEMORY_REGION

all the ports of kvm to other architactures will use the
KVM_SET_USER_MEMORY_REGION, and KVM_SET_MEMORY_REGION is left just for
legacy support for older userspace

(checkout KVM_SET_USER_MEMORY_REGION, it is in the common code)


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