• Konrad Rzeszutek Wilk's avatar
    xen-swiotlb: Retry up three times to allocate Xen-SWIOTLB · f4b2f07b
    Konrad Rzeszutek Wilk authored
    
    
    We can fail seting up Xen-SWIOTLB if:
     - The host does not have enough contiguous DMA32 memory available
       (can happen on a machine that has fragmented memory from starting,
       stopping many guests).
     - Not enough low memory (almost never happens).
    
    We retry allocating and exchanging the swath of contiguous memory
    up to three times. Each time we decrease the amount we need  - the
    minimum being of 2MB.
    
    If we compleltly fail, we will print the reason for failure on the Xen
    console on top of doing it to earlyprintk=xen console.
    Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    f4b2f07b