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Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest
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From: |
Sean Christopherson |
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Subject: |
Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory |
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Date: |
Tue, 13 Sep 2022 16:12:04 +0000 |
On Tue, Sep 13, 2022, Kirill A. Shutemov wrote:
> On Tue, Sep 13, 2022 at 02:53:25PM +0000, Sean Christopherson wrote:
> > > > Switching topics, what actually prevents mmapp() on the shim? I tried
> > > > to follow,
> > > > but I don't know these areas well enough.
> > >
> > > It has no f_op->mmap, so mmap() will fail with -ENODEV. See do_mmap().
> > > (I did not read the switch statement correctly at first. Note there are
> > > two 'fallthrough' there.)
> >
> > Ah, validate_mmap_request(). Thought not implementing ->mmap() was the
> > key, but
> > couldn't find the actual check.
>
> validate_mmap_request() is in mm/nommu.c which is not relevant for real
> computers.
>
> I was talking about this check:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/mmap.c#n1495
Hence the comment about 'fallthrough'. Thanks again!
Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory, Andy Lutomirski, 2022/09/09
Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory, Andy Lutomirski, 2022/09/09
Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory, Andy Lutomirski, 2022/09/09
Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory, Michael Roth, 2022/09/09