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SubjectRe: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory
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On Fri, Apr 14, 2023, Sean Christopherson wrote:
> On Fri, Apr 14, 2023, Ackerley Tng wrote:
> > Sean Christopherson <seanjc@google.com> writes:
> > > if (WARN_ON_ONCE(file->private_data)) {
> > > err = -EEXIST;
> > > goto err_fd;
> > > }
> >
> > Did you intend this as a check that the backing filesystem isn't using
> > the private_data field in the mapping?
> >
> > I think you meant file->f_mapping->private_data.
>
> Ya, sounds right. I should have added disclaimers that (a) I wrote this quite
> quickly and (b) it's compile tested only at this point.

FWIW, here's a very lightly tested version that doesn't explode on a basic selftest.

https://github.com/sean-jc/linux/tree/x86/upm_base_support

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