Merge tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux
Pull virtio updates from Rusty Russell:
"No real surprises"
* tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
MAINTAINERS: add tools/virtio/ under virtio
tools/virtio: move module license stub to module.h
virtio: include asm/barrier explicitly
virtio: VIRTIO_F_ANY_LAYOUT feature
lguest: fix example launcher compilation for broken glibc headers.
virtio-net: fix the race between channels setting and refill
tools/lguest: real barriers.
tools/lguest: fix missing rmb().
virtio_balloon: leak_balloon(): only tell host if we got pages deflated
virtio-pci: fix leaks of msix_affinity_masks
Fix comment typo "CONFIG_PAE"
diff --git a/MAINTAINERS b/MAINTAINERS
index af4c3be..e51d018 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8890,6 +8890,7 @@
L: virtualization@lists.linux-foundation.org
S: Maintained
F: drivers/virtio/
+F: tools/virtio/
F: drivers/net/virtio_net.c
F: drivers/block/virtio_blk.c
F: include/linux/virtio_*.h
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 42d670a..3d2a90a 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -902,7 +902,6 @@
struct scatterlist sg;
struct virtio_net_ctrl_mq s;
struct net_device *dev = vi->dev;
- int i;
if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
return 0;
@@ -916,10 +915,8 @@
queue_pairs);
return -EINVAL;
} else {
- for (i = vi->curr_queue_pairs; i < queue_pairs; i++)
- if (!try_fill_recv(&vi->rq[i], GFP_KERNEL))
- schedule_delayed_work(&vi->refill, 0);
vi->curr_queue_pairs = queue_pairs;
+ schedule_delayed_work(&vi->refill, 0);
}
return 0;
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 0098810..1f572c0 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -192,7 +192,8 @@
* virtio_has_feature(vdev, VIRTIO_BALLOON_F_MUST_TELL_HOST);
* is true, we *have* to do it in this order
*/
- tell_host(vb, vb->deflate_vq);
+ if (vb->num_pfns != 0)
+ tell_host(vb, vb->deflate_vq);
mutex_unlock(&vb->balloon_lock);
release_pages_by_pfn(vb->pfns, vb->num_pfns);
}
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index a7ce730..1aba255 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -289,9 +289,9 @@
pci_disable_msix(vp_dev->pci_dev);
vp_dev->msix_enabled = 0;
- vp_dev->msix_vectors = 0;
}
+ vp_dev->msix_vectors = 0;
vp_dev->msix_used_vectors = 0;
kfree(vp_dev->msix_names);
vp_dev->msix_names = NULL;
@@ -309,6 +309,8 @@
unsigned i, v;
int err = -ENOMEM;
+ vp_dev->msix_vectors = nvectors;
+
vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
GFP_KERNEL);
if (!vp_dev->msix_entries)
@@ -336,7 +338,6 @@
err = -ENOSPC;
if (err)
goto error;
- vp_dev->msix_vectors = nvectors;
vp_dev->msix_enabled = 1;
/* Set the vector used for configuration */
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index ca3ad41..b300787 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -1,6 +1,7 @@
#ifndef _LINUX_VIRTIO_RING_H
#define _LINUX_VIRTIO_RING_H
+#include <asm/barrier.h>
#include <linux/irqreturn.h>
#include <uapi/linux/virtio_ring.h>
diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index b7cda39..3ce768c 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -51,4 +51,7 @@
* suppressed them? */
#define VIRTIO_F_NOTIFY_ON_EMPTY 24
+/* Can the device handle any descriptor layout? */
+#define VIRTIO_F_ANY_LAYOUT 27
+
#endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */
diff --git a/tools/lguest/Makefile b/tools/lguest/Makefile
index 0ac3420..97bca48 100644
--- a/tools/lguest/Makefile
+++ b/tools/lguest/Makefile
@@ -1,5 +1,4 @@
# This creates the demonstration utility "lguest" which runs a Linux guest.
-# Missing headers? Add "-I../../../include -I../../../arch/x86/include"
CFLAGS:=-m32 -Wall -Wmissing-declarations -Wmissing-prototypes -O3 -U_FORTIFY_SOURCE
all: lguest
diff --git a/tools/lguest/lguest.c b/tools/lguest/lguest.c
index 07a0345..68f67cf 100644
--- a/tools/lguest/lguest.c
+++ b/tools/lguest/lguest.c
@@ -42,14 +42,6 @@
#include <pwd.h>
#include <grp.h>
-#include <linux/virtio_config.h>
-#include <linux/virtio_net.h>
-#include <linux/virtio_blk.h>
-#include <linux/virtio_console.h>
-#include <linux/virtio_rng.h>
-#include <linux/virtio_ring.h>
-#include <asm/bootparam.h>
-#include "../../include/linux/lguest_launcher.h"
/*L:110
* We can ignore the 43 include files we need for this program, but I do want
* to draw attention to the use of kernel-style types.
@@ -65,6 +57,15 @@
typedef uint8_t u8;
/*:*/
+#include <linux/virtio_config.h>
+#include <linux/virtio_net.h>
+#include <linux/virtio_blk.h>
+#include <linux/virtio_console.h>
+#include <linux/virtio_rng.h>
+#include <linux/virtio_ring.h>
+#include <asm/bootparam.h>
+#include "../../include/linux/lguest_launcher.h"
+
#define BRIDGE_PFX "bridge:"
#ifndef SIOCBRADDIF
#define SIOCBRADDIF 0x89a2 /* add interface to bridge */
@@ -177,7 +178,8 @@
* in precise order.
*/
#define wmb() __asm__ __volatile__("" : : : "memory")
-#define mb() __asm__ __volatile__("" : : : "memory")
+#define rmb() __asm__ __volatile__("lock; addl $0,0(%%esp)" : : : "memory")
+#define mb() __asm__ __volatile__("lock; addl $0,0(%%esp)" : : : "memory")
/* Wrapper for the last available index. Makes it easier to change. */
#define lg_last_avail(vq) ((vq)->last_avail_idx)
@@ -676,6 +678,12 @@
errx(1, "Guest moved used index from %u to %u",
last_avail, vq->vring.avail->idx);
+ /*
+ * Make sure we read the descriptor number *after* we read the ring
+ * update; don't let the cpu or compiler change the order.
+ */
+ rmb();
+
/*
* Grab the next descriptor number they're advertising, and increment
* the index we've seen.
@@ -695,6 +703,12 @@
i = head;
/*
+ * We have to read the descriptor after we read the descriptor number,
+ * but there's a data dependency there so the CPU shouldn't reorder
+ * that: no rmb() required.
+ */
+
+ /*
* If this is an indirect entry, then this buffer contains a descriptor
* table which we handle as if it's any normal descriptor chain.
*/
diff --git a/tools/virtio/linux/module.h b/tools/virtio/linux/module.h
index 3039a7e..28ce95a 100644
--- a/tools/virtio/linux/module.h
+++ b/tools/virtio/linux/module.h
@@ -1 +1,6 @@
#include <linux/export.h>
+
+#define MODULE_LICENSE(__MODULE_LICENSE_value) \
+ static __attribute__((unused)) const char *__MODULE_LICENSE_name = \
+ __MODULE_LICENSE_value
+
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h
index cd80183..8447830 100644
--- a/tools/virtio/linux/virtio.h
+++ b/tools/virtio/linux/virtio.h
@@ -45,9 +45,6 @@
void *priv;
};
-#define MODULE_LICENSE(__MODULE_LICENSE_value) \
- const char *__MODULE_LICENSE_name = __MODULE_LICENSE_value
-
/* Interfaces exported by virtio_ring. */
int virtqueue_add_sgs(struct virtqueue *vq,
struct scatterlist *sgs[],