lkml.org 
[lkml]   [2013]   [Nov]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 3.12 078/116] KVM: IOMMU: hva align mapping page size
    Date
    3.12-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Greg Edwards <gedwards@ddn.com>

    commit 27ef63c7e97d1e5dddd85051c03f8d44cc887f34 upstream.

    When determining the page size we could use to map with the IOMMU, the
    page size should also be aligned with the hva, not just the gfn. The
    gfn may not reflect the real alignment within the hugetlbfs file.

    Most of the time, this works fine. However, if the hugetlbfs file is
    backed by non-contiguous huge pages, a multi-huge page memslot starts at
    an unaligned offset within the hugetlbfs file, and the gfn is aligned
    with respect to the huge page size, kvm_host_page_size() will return the
    huge page size and we will use that to map with the IOMMU.

    When we later unpin that same memslot, the IOMMU returns the unmap size
    as the huge page size, and we happily unpin that many pfns in
    monotonically increasing order, not realizing we are spanning
    non-contiguous huge pages and partially unpin the wrong huge page.

    Ensure the IOMMU mapping page size is aligned with the hva corresponding
    to the gfn, which does reflect the alignment within the hugetlbfs file.

    Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
    Signed-off-by: Greg Edwards <gedwards@ddn.com>
    Signed-off-by: Gleb Natapov <gleb@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    virt/kvm/iommu.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/virt/kvm/iommu.c
    +++ b/virt/kvm/iommu.c
    @@ -103,6 +103,10 @@ int kvm_iommu_map_pages(struct kvm *kvm,
    while ((gfn << PAGE_SHIFT) & (page_size - 1))
    page_size >>= 1;

    + /* Make sure hva is aligned to the page size we want to map */
    + while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
    + page_size >>= 1;
    +
    /*
    * Pin all pages we are about to map in memory. This is
    * important because we unmap and unpin in 4kb steps later.



    \
     
     \ /
      Last update: 2013-11-27 02:41    [W:2.809 / U:0.144 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site