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hw/rdma: Bugfix - Support non-aligned buffers

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RDMA application can provide non-aligned buffers to be registered. In
such case the DMA address passed by driver is pointing to the beginning
of the physical address of the mapped page so we can't distinguish
between two addresses from the same page.

Fix it by keeping the offset of the virtual address in mr->virt.

Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Message-Id: <20180805153518.2983-13-yuval.shaia@oracle.com>
Signed-off-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
This commit is contained in:
Yuval Shaia 2018-08-05 18:35:17 +03:00 committed by Marcel Apfelbaum
parent abc665aae3
commit 7d2ce4b016
2 changed files with 3 additions and 0 deletions
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2
hw/rdma/rdma_rm.c
View file

@ -166,6 +166,7 @@ int rdma_rm_alloc_mr(RdmaDeviceResources *dev_res, uint32_t pd_handle,
mr->virt = host_virt;
mr->start = guest_start;
mr->length = guest_length;
mr->virt += (mr->start & (TARGET_PAGE_SIZE - 1));
ret = rdma_backend_create_mr(&mr->backend_mr, &pd->backend_pd, mr->virt,
mr->length, access_flags);
@ -203,6 +204,7 @@ void rdma_rm_dealloc_mr(RdmaDeviceResources *dev_res, uint32_t mr_handle)
rdma_backend_destroy_mr(&mr->backend_mr);
pr_dbg("start=0x%" PRIx64 "\n", mr->start);
if (mr->start) {
mr->virt -= (mr->start & (TARGET_PAGE_SIZE - 1));
munmap(mr->virt, mr->length);
}
res_tbl_dealloc(&dev_res->mr_tbl, mr_handle);

1
hw/rdma/vmw/pvrdma_cmd.c
View file

@ -59,6 +59,7 @@ static void *pvrdma_map_to_pdir(PCIDevice *pdev, uint64_t pdir_dma,
}
host_virt = mremap(curr_page, 0, length, MREMAP_MAYMOVE);
pr_dbg("mremap %p -> %p\n", curr_page, host_virt);
if (host_virt == MAP_FAILED) {
host_virt = NULL;
error_report("PVRDMA: Failed to remap memory for host_virt");