Messages in this thread | | | Date | Tue, 13 Sep 2022 19:00:46 +0300 | From | "Kirill A. Shutemov" <> | Subject | Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory |
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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
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