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Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest
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From: |
Kirill A. Shutemov |
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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 19:00:46 +0300 |
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
--
Kiryl Shutsemau / Kirill A. Shutemov
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