[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 12/13] hw/rdma: Bugfix: Support non-aligned buffers
From: |
Yuval Shaia |
Subject: |
[Qemu-devel] [PATCH 12/13] hw/rdma: Bugfix: Support non-aligned buffers |
Date: |
Mon, 16 Jul 2018 10:40:37 +0300 |
RDMA applications 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 <address@hidden>
---
hw/rdma/rdma_rm.c | 2 ++
hw/rdma/vmw/pvrdma_cmd.c | 1 +
2 files changed, 3 insertions(+)
diff --git a/hw/rdma/rdma_rm.c b/hw/rdma/rdma_rm.c
index 859c900003..8d59a42cd1 100644
--- a/hw/rdma/rdma_rm.c
+++ b/hw/rdma/rdma_rm.c
@@ -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);
diff --git a/hw/rdma/vmw/pvrdma_cmd.c b/hw/rdma/vmw/pvrdma_cmd.c
index bb898265a3..4ff242e793 100644
--- a/hw/rdma/vmw/pvrdma_cmd.c
+++ b/hw/rdma/vmw/pvrdma_cmd.c
@@ -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");
--
2.17.1
- [Qemu-devel] [PATCH 08/13] hw/rdma: Reorder resource cleanup, (continued)
- [Qemu-devel] [PATCH 08/13] hw/rdma: Reorder resource cleanup, Yuval Shaia, 2018/07/16
- [Qemu-devel] [PATCH 07/13] hw/rdma: Do not allocate memory for non-dma MR, Yuval Shaia, 2018/07/16
- [Qemu-devel] [PATCH 09/13] hw/pvrdma: Cosmetic change - indent right, Yuval Shaia, 2018/07/16
- [Qemu-devel] [PATCH 10/13] hw/rdma: Cosmetic change - move to generic function, Yuval Shaia, 2018/07/16
- [Qemu-devel] [PATCH 11/13] hw/rdma: Print backend QP number in hex format, Yuval Shaia, 2018/07/16
- [Qemu-devel] [PATCH 12/13] hw/rdma: Bugfix: Support non-aligned buffers,
Yuval Shaia <=
- [Qemu-devel] [PATCH 13/13] hw/rdma: Save pci dev in backend_dev, Yuval Shaia, 2018/07/16