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29 July 2024, 15:18:00 UTC
Revision a4b9722a5996017264feb19ebe86efe4380f7afb authored by Axel Rasmussen on 19 May 2021, 20:03:38 UTC, committed by Paolo Bonzini on 27 May 2021, 11:45:57 UTC 
KVM: selftests: allow using UFFD minor faults for demand paging
 
UFFD handling of MINOR faults is a new feature whose use case is to
speed up demand paging (compared to MISSING faults). So, it's
interesting to let this selftest exercise this new mode.

Modify the demand paging test to have the option of using UFFD minor
faults, as opposed to missing faults. Now, when turning on userfaultfd
with '-u', the desired mode has to be specified ("MISSING" or "MINOR").

If we're in minor mode, before registering, prefault via the *alias*.
This way, the guest will trigger minor faults, instead of missing
faults, and we can UFFDIO_CONTINUE to resolve them.

Modify the page fault handler function to use the right ioctl depending
on the mode we're running in. In MINOR mode, use UFFDIO_CONTINUE.

Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Message-Id: <20210519200339.829146-10-axelrasmussen@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 parent 94f3f2b
History
Tip revision: a4b9722a5996017264feb19ebe86efe4380f7afb authored by Axel Rasmussen on 19 May 2021, 20:03:38 UTC
KVM: selftests: allow using UFFD minor faults for demand paging
Tip revision: a4b9722
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.clang-format -rw-r--r-- 16.4 KB
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.gitignore -rw-r--r-- 1.9 KB
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COPYING -rw-r--r-- 496 bytes
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