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vhost: add info that using VFIO with vhost is not supported

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As VFIO does not work with vhost library print warning during vhost
initialization

Change-Id: Iaa31808c7007f1840a6a441e2591f0a3986b0c29
Signed-off-by: Pawel Wodkowski <pawelx.wodkowski@intel.com>
Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
This commit is contained in:
Pawel Wodkowski 2017-03-23 16:31:58 +01:00 committed by Daniel Verkamp
parent cc9b53ec25
commit 5109f56ea5
1 changed files with 32 additions and 0 deletions
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32
lib/vhost/vhost.c
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@ -40,6 +40,7 @@
#include <sys/stat.h>
#include <unistd.h>
#include <semaphore.h>
#include <dirent.h>
#include <rte_config.h>
#include <rte_malloc.h>
@ -1122,6 +1123,28 @@ session_start(void *arg)
return NULL;
}
/**
* Check if /sys/kernel/iommu_groups exists and is not empty
*/
static bool
has_iommu_groups(void)
{
struct dirent *d;
int iommu_count = 0;
DIR *dir = opendir("/sys/kernel/iommu_groups");
if (dir == NULL) {
return false;
}
while (iommu_count < 3 && (d = readdir(dir)) != NULL) {
++iommu_count;
}
closedir(dir);
return iommu_count > 2; /* there will always be ./ and ../ entries */
}
void
spdk_vhost_startup(void *arg1, void *arg2)
{
@ -1145,6 +1168,15 @@ spdk_vhost_startup(void *arg1, void *arg2)
if (ret != 0)
rte_exit(EXIT_FAILURE, "Cannot construct vhost controllers\n");
if (has_iommu_groups()) {
RTE_LOG(WARNING, VHOST_CONFIG,
"Currently VFIO driver is not supported by vhost library\n"
"Although guest might be able to boot and see devices, it will not be able\n"
"to do any IO to physical devices (Malloc with IOAT, NVMe).\n"
"Please use uio_pci_generic driver with vhost app/library.\n"
"See documentation for more information.\n");
}
rte_vhost_driver_callback_register(&virtio_net_device_ops);
if (pthread_create(&tid, NULL, &session_start, NULL) < 0)