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    Subject[PATCH 4.10 043/167] iommu/vt-d: Tylersburg isoch identity map check is done too late.
    Date
    4.10-stable review patch.  If anyone has any objections, please let me know.

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

    From: Ashok Raj <ashok.raj@intel.com>

    commit 21e722c4c8377b5bc82ad058fed12165af739c1b upstream.

    The check to set identity map for tylersburg is done too late. It needs
    to be done before the check for identity_map domain is done.

    To: Joerg Roedel <joro@8bytes.org>
    To: David Woodhouse <dwmw2@infradead.org>
    Cc: iommu@lists.linux-foundation.org
    Cc: linux-kernel@vger.kernel.org
    Cc: Ashok Raj <ashok.raj@intel.com>

    Fixes: 86080ccc22 ("iommu/vt-d: Allocate si_domain in init_dmars()")
    Signed-off-by: Ashok Raj <ashok.raj@intel.com>
    Reported-by: Yunhong Jiang <yunhong.jiang@intel.com>
    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/iommu/intel-iommu.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/drivers/iommu/intel-iommu.c
    +++ b/drivers/iommu/intel-iommu.c
    @@ -3325,13 +3325,14 @@ static int __init init_dmars(void)
    iommu_identity_mapping |= IDENTMAP_GFX;
    #endif

    + check_tylersburg_isoch();
    +
    if (iommu_identity_mapping) {
    ret = si_domain_init(hw_pass_through);
    if (ret)
    goto free_iommu;
    }

    - check_tylersburg_isoch();

    /*
    * If we copied translations from a previous kernel in the kdump

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