eal: increase I/O privilege

Set I/O privilege to the highest level (3).
It is needed for virtio.

Signed-off-by: Intel

lib/librte_eal/common/include/rte_eal.h

@@ -83,13 +83,19 @@ struct rte_config {
 	/** Primary or secondary configuration */
 	enum rte_proc_type_t process_type;
 
+	/** A set of general status flags */
+	unsigned flags;
+
 	/**
 	 * Pointer to memory configuration, which may be shared across multiple
 	 * Intel DPDK instances
 	 */
 	struct rte_mem_config *mem_config;
 } __attribute__((__packed__));
 
+/* Flag definitions for rte_config flags */
+#define EAL_FLG_HIGH_IOPL 1 /**< indicates high IO privilage in a linux env */
+
 /**
  * Get the global configuration structure.
  *

lib/librte_eal/linuxapp/eal/eal.c

@@ -47,6 +47,7 @@
 #include <errno.h>
 #include <sys/mman.h>
 #include <sys/queue.h>
+#include <sys/io.h>
 #include <sys/user.h>
 #include <linux/binfmts.h>
 
@@ -97,6 +98,8 @@
 
 #define SOCKET_MEM_STRLEN (RTE_MAX_NUMA_NODES * 10)
 
+#define HIGHEST_RPL 3
+
 #define BITS_PER_HEX 4
 
 #define GET_BLACKLIST_FIELD(in, fd, lim, dlm)                   \
@@ -833,6 +836,15 @@ rte_eal_mcfg_complete(void)
 		rte_config.mem_config->magic = RTE_MAGIC;
 }
 
+/*
+ * Request iopl priviledge for all RPL, returns 0 on success
+ */
+static int
+rte_eal_iopl_init(void)
+{
+	return iopl(HIGHEST_RPL);
+}
+
 /* Launch threads, called at application init(). */
 int
 rte_eal_init(int argc, char **argv)
@@ -879,6 +891,9 @@ rte_eal_init(int argc, char **argv)
 	rte_srand(rte_rdtsc());
 
 	rte_config_init();
+
+	if (rte_eal_iopl_init() == 0)
+		rte_config.flags |= EAL_FLG_HIGH_IOPL;
 
 	if (rte_eal_cpu_init() < 0)
 		rte_panic("Cannot detect lcores\n");