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vhost/compat: add RTE_VHOST_USER_ASYNC_COPY flag when used IOVA_PA mode

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Recently, we discovered that under the SPDK + UIO mode, it is possible that vm may be wrong when doing io.
such as:
[root@VM_6_151_centos ~]# mkfs.xfs /dev/vdc
meta-data=/dev/vdc               isize=512    agcount=4, agsize=234421142 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=937684566, imaxpct=5
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=457853, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
bad magic number
bad magic number
Metadata corruption detected at xfs_sb block 0x0/0x1000
libxfs_writebufr: write verifer failed on xfs_sb bno 0x0/0x1000

the github issue link: https://github.com/spdk/spdk/issues/1738
After investigation, we found as below:
The qemu set to VHOST_USER_SET_MEM_TABLE then call vhost_user_set_mem_table(dpdk version spdk-20.11)->mmap(without MAP_POPULATE)
the mmap will only return the virtual address not map the virtual address to the physical address actually.
after call vtophys_notify->vtophys_get_paddr_pagemap, we will get a wrong physical(the virtual address we not access)

So this patch is to set MAP_POPULATE during we use SPDK + UIO.

Signed-off-by: andypma <andypma@tencent.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/5970 (master)

(cherry picked from commit 7741de6b7d)
Change-Id: Ib921b6d7381f46bb5894ed787cef52e02524197a
Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6182
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
andypma 2021-01-15 17:16:30 +08:00 committed by Tomasz Zawadzki
parent bbe2ed83dc
commit 68eb748759
1 changed files with 1 additions and 1 deletions
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2
lib/vhost/rte_vhost_compat.c
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@ -331,7 +331,7 @@ vhost_register_unix_socket(const char *path, const char *ctrl_name,
}
}
if (rte_vhost_driver_register(path, 0) != 0) {
if (rte_vhost_driver_register(path, RTE_VHOST_USER_ASYNC_COPY) != 0) {
SPDK_ERRLOG("Could not register controller %s with vhost library\n", ctrl_name);
SPDK_ERRLOG("Check if domain socket %s already exists\n", path);
return -EIO;