Revision 32ffa4f71e10009498ae6b54da65ab316db967bd authored by Axel Rasmussen on 19 May 2021, 20:03:33 UTC, committed by Paolo Bonzini on 27 May 2021, 11:45:55 UTC
This is a preparatory commit needed before we can use different kinds of backing pages for guest memory. Previously, we used perf_test_args.host_page_size, which is the host's native page size (commonly 4K). For VM_MEM_SRC_ANONYMOUS this turns out to be okay, but in a follow-up commit we want to allow using different kinds of backing memory. Take VM_MEM_SRC_ANONYMOUS_HUGETLB for example. Without this change, if we used that backing page type, when we issued a UFFDIO_COPY ioctl we'd only do so with 4K, rather than the full 2M of a backing hugepage. In this case, UFFDIO_COPY returns -EINVAL (__mcopy_atomic_hugetlb checks the size). Signed-off-by: Axel Rasmussen <axelrasmussen@google.com> Message-Id: <20210519200339.829146-5-axelrasmussen@google.com> Reviewed-by: Ben Gardon <bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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TODO-parport
Things to be done.
0. Fix the bugs (see BUGS-parport).
1. Proper documentation.
2. A better lp.c:
a) ECP support would be nice. This can only work if both the port and
the printer support it.
b) Handle status readback automatically. IEEE1284 printers can post status
bits when they have something to say. We should read out and deal
with (maybe just log) whatever the printer wants to tell the world.
3. Support more hardware (eg m68k, Sun bpp).
4. A better PLIP (make use of bidirectional/ECP/EPP ports).
See <URL:http://people.redhat.com/twaugh/parport/>.
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