lkml.org 
[lkml]   [2019]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v3 7/7] iommu/vt-d: Differentiate relaxable and non relaxable RMRRs
    Date
    Now we have a new IOMMU_RESV_DIRECT_RELAXABLE reserved memory
    region type, let's report USB and GFX RMRRs as relaxable ones.

    This allows to have a finer reporting at IOMMU API level of
    reserved memory regions. This will be exploitable by VFIO to
    define the usable IOVA range and detect potential conflicts
    between the guest physical address space and host reserved
    regions.

    Signed-off-by: Eric Auger <eric.auger@redhat.com>
    ---
    drivers/iommu/intel-iommu.c | 10 ++++++++--
    1 file changed, 8 insertions(+), 2 deletions(-)

    diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
    index a36604f4900f..af1d65fdedfc 100644
    --- a/drivers/iommu/intel-iommu.c
    +++ b/drivers/iommu/intel-iommu.c
    @@ -5493,7 +5493,9 @@ static void intel_iommu_get_resv_regions(struct device *device,
    for_each_rmrr_units(rmrr) {
    for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
    i, i_dev) {
    + struct pci_dev *pdev = to_pci_dev(device);
    struct iommu_resv_region *resv;
    + enum iommu_resv_type type;
    size_t length;

    if (i_dev != device &&
    @@ -5501,9 +5503,13 @@ static void intel_iommu_get_resv_regions(struct device *device,
    continue;

    length = rmrr->end_address - rmrr->base_address + 1;
    +
    + type = (pdev &&
    + (IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev))) ?
    + IOMMU_RESV_DIRECT_RELAXABLE : IOMMU_RESV_DIRECT;
    +
    resv = iommu_alloc_resv_region(rmrr->base_address,
    - length, prot,
    - IOMMU_RESV_DIRECT,
    + length, prot, type,
    GFP_ATOMIC);
    if (!resv)
    break;
    --
    2.20.1
    \
     
     \ /
      Last update: 2019-05-16 12:09    [W:4.154 / U:0.560 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site