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    SubjectRe: [Xen-devel] [PATCH v2 1/3] xen/swiotlb: fix condition for calling xen_destroy_contiguous_region()
    >>> On 29.05.19 at 11:04, <jgross@suse.com> wrote:
    > The condition in xen_swiotlb_free_coherent() for deciding whether to
    > call xen_destroy_contiguous_region() is wrong: in case the region to
    > be freed is not contiguous calling xen_destroy_contiguous_region() is
    > the wrong thing to do: it would result in inconsistent mappings of
    > multiple PFNs to the same MFN. This will lead to various strange
    > crashes or data corruption.
    >
    > Instead of calling xen_destroy_contiguous_region() in that case a
    > warning should be issued as that situation should never occur.
    >
    > Cc: stable@vger.kernel.org
    > Signed-off-by: Juergen Gross <jgross@suse.com>
    > Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

    Reviewed-by: Jan Beulich <jbeulich@suse.com>


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