Commit 5109f56e authored by Pawel Wodkowski's avatar Pawel Wodkowski Committed by Daniel Verkamp
Browse files

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



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

Change-Id: Iaa31808c7007f1840a6a441e2591f0a3986b0c29
Signed-off-by: default avatarPawel Wodkowski <pawelx.wodkowski@intel.com>
Signed-off-by: default avatarDariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
parent cc9b53ec

lib/vhost/vhost.c

+32 −0
Original line number Diff line number Diff line
@@ -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)