[Xen-devel] dpdk kernel module when calling xen_create_contiguous_region

[Samuel Monderer <SMonderer@xxxxxxxxxxxxxxx>]

Hi,

DPDK application requires hugepages to run.
XEN DOM0 does not support hugepages, to be able to run dpdk application in Dom0 
a kernel module has been developed to facilitate the allocation and
mapping of memory.

The current version of dpdk uses the old version of  
xen_create_contiguous_region which doesn't get the 4th parameter dma_handle.
I tried to update the call to  xen_create_contiguous_region as following, but 
the module crashes when it calls  xen_create_contiguous_region.
--- a/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
+++ b/lib/librte_eal/linuxapp/xen_dom0/dom0_mm_misc.c
@@ -64,6 +64,7 @@
 #include <linux/errno.h>
 #include <linux/vmalloc.h>
 #include <linux/mm.h>

 #include <xen/xen.h>
 #include <xen/page.h>
@@ -309,6 +310,7 @@ dom0_prepare_memsegs(struct memory_info* meminfo, struct 
dom0_
        uint64_t pfn, vstart, vaddr;
        uint32_t i, num_block, size;
        int idx;
+       dma_addr_t dma_handle;

        /* Allocate 2M memory once */
        num_block = meminfo->size / 2;
@@ -344,7 +346,7 @@ dom0_prepare_memsegs(struct memory_info* meminfo, struct 
dom0_
                 * contiguous physical addresses, its maximum size is 2M.
                 */
                if 
(xen_create_contiguous_region(mm_data->block_info[i].vir_addr,
-                                   DOM0_CONTIG_NUM_ORDER, 0) == 0) {
+                                   DOM0_CONTIG_NUM_ORDER, 0, &dma_handle) == 
0) {
                        mm_data->block_info[i].exchange_flag = 1;
                        mm_data->block_info[i].mfn =
                                pfn_to_mfn(mm_data->block_info[i].pfn);

Tried to find some documentation xen memory regions without success.

Samuel

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