Re: [kvm PATCH v4 0/2] use vmalloc to allocate vmx vcpus

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Wed, Oct 31, 2018 at 01:48:44PM +0000, Marc Orr wrote:
> Thanks for the explanation. Is there a way to dynamically detect the
> memory allocation done by kvmalloc() (i.e., kmalloc() or vmalloc())?
> If so, we could use kvmalloc(), and add two code paths to do the
> physical mapping, according to whether the underlying memory was
> allocated with kmalloc() or vmalloc().

Yes -- it's used in the implementation of kvfree():

        if (is_vmalloc_addr(addr))
                vfree(addr);
        else
                kfree(addr);