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authorLinus Torvalds <torvalds@linux-foundation.org>2015-04-16 14:01:03 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-16 14:01:03 -0500
commit497a5df7bf6ffd136ae21c49d1a01292930d7ca2 (patch)
tree774215d43cdc9fbd8660086d1801400163dcbd52 /drivers
parent714d8e7e27197dd39b2550e762a6a6fcf397a471 (diff)
parent0b97b03d88b40bfbd7ff0e069186a137d9786d43 (diff)
downloadlinux-497a5df7bf6ffd136ae21c49d1a01292930d7ca2.tar.bz2
Merge tag 'stable/for-linus-4.1-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen features and fixes from David Vrabel: - use a single source list of hypercalls, generating other tables etc. at build time. - add a "Xen PV" APIC driver to support >255 VCPUs in PV guests. - significant performance improve to guest save/restore/migration. - scsiback/front save/restore support. - infrastructure for multi-page xenbus rings. - misc fixes. * tag 'stable/for-linus-4.1-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen/pci: Try harder to get PXM information for Xen xenbus_client: Extend interface to support multi-page ring xen-pciback: also support disabling of bus-mastering and memory-write-invalidate xen: support suspend/resume in pvscsi frontend xen: scsiback: add LUN of restored domain xen-scsiback: define a pr_fmt macro with xen-pvscsi xen/mce: fix up xen_late_init_mcelog() error handling xen/privcmd: improve performance of MMAPBATCH_V2 xen: unify foreign GFN map/unmap for auto-xlated physmap guests x86/xen/apic: WARN with details. x86/xen: Provide a "Xen PV" APIC driver to support >255 VCPUs xen/pciback: Don't print scary messages when unsupported by hypervisor. xen: use generated hypercall symbols in arch/x86/xen/xen-head.S xen: use generated hypervisor symbols in arch/x86/xen/trace.c xen: synchronize include/xen/interface/xen.h with xen xen: build infrastructure for generating hypercall depending symbols xen: balloon: Use static attribute groups for sysfs entries xen: pcpu: Use static attribute groups for sysfs entry
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/xen-blkback/xenbus.c5
-rw-r--r--drivers/block/xen-blkfront.c5
-rw-r--r--drivers/char/tpm/xen-tpmfront.c5
-rw-r--r--drivers/net/xen-netback/netback.c4
-rw-r--r--drivers/net/xen-netfront.c9
-rw-r--r--drivers/pci/xen-pcifront.c5
-rw-r--r--drivers/scsi/xen-scsifront.c219
-rw-r--r--drivers/xen/Kconfig6
-rw-r--r--drivers/xen/Makefile1
-rw-r--r--drivers/xen/mcelog.c25
-rw-r--r--drivers/xen/pci.c15
-rw-r--r--drivers/xen/pcpu.c44
-rw-r--r--drivers/xen/privcmd.c117
-rw-r--r--drivers/xen/xen-balloon.c45
-rw-r--r--drivers/xen/xen-pciback/conf_space_header.c15
-rw-r--r--drivers/xen/xen-pciback/pci_stub.c4
-rw-r--r--drivers/xen/xen-pciback/xenbus.c2
-rw-r--r--drivers/xen/xen-scsiback.c96
-rw-r--r--drivers/xen/xenbus/xenbus_client.c387
-rw-r--r--drivers/xen/xlate_mmu.c143
20 files changed, 866 insertions, 286 deletions
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index e3afe97280b1..ff3025922c14 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -193,7 +193,7 @@ fail:
return ERR_PTR(-ENOMEM);
}
-static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page,
+static int xen_blkif_map(struct xen_blkif *blkif, grant_ref_t gref,
unsigned int evtchn)
{
int err;
@@ -202,7 +202,8 @@ static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page,
if (blkif->irq)
return 0;
- err = xenbus_map_ring_valloc(blkif->be->dev, shared_page, &blkif->blk_ring);
+ err = xenbus_map_ring_valloc(blkif->be->dev, &gref, 1,
+ &blkif->blk_ring);
if (err < 0)
return err;
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 37779e4c4585..2c61cf8c6f61 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1245,6 +1245,7 @@ static int setup_blkring(struct xenbus_device *dev,
struct blkfront_info *info)
{
struct blkif_sring *sring;
+ grant_ref_t gref;
int err;
info->ring_ref = GRANT_INVALID_REF;
@@ -1257,13 +1258,13 @@ static int setup_blkring(struct xenbus_device *dev,
SHARED_RING_INIT(sring);
FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
- err = xenbus_grant_ring(dev, virt_to_mfn(info->ring.sring));
+ err = xenbus_grant_ring(dev, info->ring.sring, 1, &gref);
if (err < 0) {
free_page((unsigned long)sring);
info->ring.sring = NULL;
goto fail;
}
- info->ring_ref = err;
+ info->ring_ref = gref;
err = xenbus_alloc_evtchn(dev, &info->evtchn);
if (err)
diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
index c3b4f5a5ac10..3111f2778079 100644
--- a/drivers/char/tpm/xen-tpmfront.c
+++ b/drivers/char/tpm/xen-tpmfront.c
@@ -193,6 +193,7 @@ static int setup_ring(struct xenbus_device *dev, struct tpm_private *priv)
struct xenbus_transaction xbt;
const char *message = NULL;
int rv;
+ grant_ref_t gref;
priv->shr = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
if (!priv->shr) {
@@ -200,11 +201,11 @@ static int setup_ring(struct xenbus_device *dev, struct tpm_private *priv)
return -ENOMEM;
}
- rv = xenbus_grant_ring(dev, virt_to_mfn(priv->shr));
+ rv = xenbus_grant_ring(dev, &priv->shr, 1, &gref);
if (rv < 0)
return rv;
- priv->ring_ref = rv;
+ priv->ring_ref = gref;
rv = xenbus_alloc_evtchn(dev, &priv->evtchn);
if (rv)
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index b8c471813f4c..4de46aa61d95 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1780,7 +1780,7 @@ int xenvif_map_frontend_rings(struct xenvif_queue *queue,
int err = -ENOMEM;
err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif),
- tx_ring_ref, &addr);
+ &tx_ring_ref, 1, &addr);
if (err)
goto err;
@@ -1788,7 +1788,7 @@ int xenvif_map_frontend_rings(struct xenvif_queue *queue,
BACK_RING_INIT(&queue->tx, txs, PAGE_SIZE);
err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif),
- rx_ring_ref, &addr);
+ &rx_ring_ref, 1, &addr);
if (err)
goto err;
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 720aaf6313d2..4c08f98f4484 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1483,6 +1483,7 @@ static int setup_netfront(struct xenbus_device *dev,
{
struct xen_netif_tx_sring *txs;
struct xen_netif_rx_sring *rxs;
+ grant_ref_t gref;
int err;
queue->tx_ring_ref = GRANT_INVALID_REF;
@@ -1499,10 +1500,10 @@ static int setup_netfront(struct xenbus_device *dev,
SHARED_RING_INIT(txs);
FRONT_RING_INIT(&queue->tx, txs, PAGE_SIZE);
- err = xenbus_grant_ring(dev, virt_to_mfn(txs));
+ err = xenbus_grant_ring(dev, txs, 1, &gref);
if (err < 0)
goto grant_tx_ring_fail;
- queue->tx_ring_ref = err;
+ queue->tx_ring_ref = gref;
rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
if (!rxs) {
@@ -1513,10 +1514,10 @@ static int setup_netfront(struct xenbus_device *dev,
SHARED_RING_INIT(rxs);
FRONT_RING_INIT(&queue->rx, rxs, PAGE_SIZE);
- err = xenbus_grant_ring(dev, virt_to_mfn(rxs));
+ err = xenbus_grant_ring(dev, rxs, 1, &gref);
if (err < 0)
goto grant_rx_ring_fail;
- queue->rx_ring_ref = err;
+ queue->rx_ring_ref = gref;
if (feature_split_evtchn)
err = setup_netfront_split(queue);
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index b1ffebec9b9e..7cfd2db02deb 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -777,12 +777,13 @@ static int pcifront_publish_info(struct pcifront_device *pdev)
{
int err = 0;
struct xenbus_transaction trans;
+ grant_ref_t gref;
- err = xenbus_grant_ring(pdev->xdev, virt_to_mfn(pdev->sh_info));
+ err = xenbus_grant_ring(pdev->xdev, pdev->sh_info, 1, &gref);
if (err < 0)
goto out;
- pdev->gnt_ref = err;
+ pdev->gnt_ref = gref;
err = xenbus_alloc_evtchn(pdev->xdev, &pdev->evtchn);
if (err)
diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
index 34199d206ba6..fad22caf0eff 100644
--- a/drivers/scsi/xen-scsifront.c
+++ b/drivers/scsi/xen-scsifront.c
@@ -63,6 +63,7 @@
#define VSCSIFRONT_OP_ADD_LUN 1
#define VSCSIFRONT_OP_DEL_LUN 2
+#define VSCSIFRONT_OP_READD_LUN 3
/* Tuning point. */
#define VSCSIIF_DEFAULT_CMD_PER_LUN 10
@@ -113,8 +114,13 @@ struct vscsifrnt_info {
DECLARE_BITMAP(shadow_free_bitmap, VSCSIIF_MAX_REQS);
struct vscsifrnt_shadow *shadow[VSCSIIF_MAX_REQS];
+ /* Following items are protected by the host lock. */
wait_queue_head_t wq_sync;
+ wait_queue_head_t wq_pause;
unsigned int wait_ring_available:1;
+ unsigned int waiting_pause:1;
+ unsigned int pause:1;
+ unsigned callers;
char dev_state_path[64];
struct task_struct *curr;
@@ -274,31 +280,31 @@ static void scsifront_sync_cmd_done(struct vscsifrnt_info *info,
wake_up(&shadow->wq_reset);
}
-static int scsifront_cmd_done(struct vscsifrnt_info *info)
+static void scsifront_do_response(struct vscsifrnt_info *info,
+ struct vscsiif_response *ring_rsp)
+{
+ if (WARN(ring_rsp->rqid >= VSCSIIF_MAX_REQS ||
+ test_bit(ring_rsp->rqid, info->shadow_free_bitmap),
+ "illegal rqid %u returned by backend!\n", ring_rsp->rqid))
+ return;
+
+ if (info->shadow[ring_rsp->rqid]->act == VSCSIIF_ACT_SCSI_CDB)
+ scsifront_cdb_cmd_done(info, ring_rsp);
+ else
+ scsifront_sync_cmd_done(info, ring_rsp);
+}
+
+static int scsifront_ring_drain(struct vscsifrnt_info *info)
{
struct vscsiif_response *ring_rsp;
RING_IDX i, rp;
int more_to_do = 0;
- unsigned long flags;
-
- spin_lock_irqsave(info->host->host_lock, flags);
rp = info->ring.sring->rsp_prod;
rmb(); /* ordering required respective to dom0 */
for (i = info->ring.rsp_cons; i != rp; i++) {
-
ring_rsp = RING_GET_RESPONSE(&info->ring, i);
-
- if (WARN(ring_rsp->rqid >= VSCSIIF_MAX_REQS ||
- test_bit(ring_rsp->rqid, info->shadow_free_bitmap),
- "illegal rqid %u returned by backend!\n",
- ring_rsp->rqid))
- continue;
-
- if (info->shadow[ring_rsp->rqid]->act == VSCSIIF_ACT_SCSI_CDB)
- scsifront_cdb_cmd_done(info, ring_rsp);
- else
- scsifront_sync_cmd_done(info, ring_rsp);
+ scsifront_do_response(info, ring_rsp);
}
info->ring.rsp_cons = i;
@@ -308,6 +314,18 @@ static int scsifront_cmd_done(struct vscsifrnt_info *info)
else
info->ring.sring->rsp_event = i + 1;
+ return more_to_do;
+}
+
+static int scsifront_cmd_done(struct vscsifrnt_info *info)
+{
+ int more_to_do;
+ unsigned long flags;
+
+ spin_lock_irqsave(info->host->host_lock, flags);
+
+ more_to_do = scsifront_ring_drain(info);
+
info->wait_ring_available = 0;
spin_unlock_irqrestore(info->host->host_lock, flags);
@@ -328,6 +346,24 @@ static irqreturn_t scsifront_irq_fn(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static void scsifront_finish_all(struct vscsifrnt_info *info)
+{
+ unsigned i;
+ struct vscsiif_response resp;
+
+ scsifront_ring_drain(info);
+
+ for (i = 0; i < VSCSIIF_MAX_REQS; i++) {
+ if (test_bit(i, info->shadow_free_bitmap))
+ continue;
+ resp.rqid = i;
+ resp.sense_len = 0;
+ resp.rslt = DID_RESET << 16;
+ resp.residual_len = 0;
+ scsifront_do_response(info, &resp);
+ }
+}
+
static int map_data_for_request(struct vscsifrnt_info *info,
struct scsi_cmnd *sc,
struct vscsiif_request *ring_req,
@@ -475,6 +511,27 @@ static struct vscsiif_request *scsifront_command2ring(
return ring_req;
}
+static int scsifront_enter(struct vscsifrnt_info *info)
+{
+ if (info->pause)
+ return 1;
+ info->callers++;
+ return 0;
+}
+
+static void scsifront_return(struct vscsifrnt_info *info)
+{
+ info->callers--;
+ if (info->callers)
+ return;
+
+ if (!info->waiting_pause)
+ return;
+
+ info->waiting_pause = 0;
+ wake_up(&info->wq_pause);
+}
+
static int scsifront_queuecommand(struct Scsi_Host *shost,
struct scsi_cmnd *sc)
{
@@ -486,6 +543,10 @@ static int scsifront_queuecommand(struct Scsi_Host *shost,
uint16_t rqid;
spin_lock_irqsave(shost->host_lock, flags);
+ if (scsifront_enter(info)) {
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ return SCSI_MLQUEUE_HOST_BUSY;
+ }
if (RING_FULL(&info->ring))
goto busy;
@@ -505,6 +566,7 @@ static int scsifront_queuecommand(struct Scsi_Host *shost,
if (err < 0) {
pr_debug("%s: err %d\n", __func__, err);
scsifront_put_rqid(info, rqid);
+ scsifront_return(info);
spin_unlock_irqrestore(shost->host_lock, flags);
if (err == -ENOMEM)
return SCSI_MLQUEUE_HOST_BUSY;
@@ -514,11 +576,13 @@ static int scsifront_queuecommand(struct Scsi_Host *shost,
}
scsifront_do_request(info);
+ scsifront_return(info);
spin_unlock_irqrestore(shost->host_lock, flags);
return 0;
busy:
+ scsifront_return(info);
spin_unlock_irqrestore(shost->host_lock, flags);
pr_debug("%s: busy\n", __func__);
return SCSI_MLQUEUE_HOST_BUSY;
@@ -549,7 +613,7 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
if (ring_req)
break;
}
- if (err) {
+ if (err || info->pause) {
spin_unlock_irq(host->host_lock);
kfree(shadow);
return FAILED;
@@ -561,6 +625,11 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
spin_lock_irq(host->host_lock);
}
+ if (scsifront_enter(info)) {
+ spin_unlock_irq(host->host_lock);
+ return FAILED;
+ }
+
ring_req->act = act;
ring_req->ref_rqid = s->rqid;
@@ -587,6 +656,7 @@ static int scsifront_action_handler(struct scsi_cmnd *sc, uint8_t act)
err = FAILED;
}
+ scsifront_return(info);
spin_unlock_irq(host->host_lock);
return err;
}
@@ -644,6 +714,7 @@ static int scsifront_alloc_ring(struct vscsifrnt_info *info)
{
struct xenbus_device *dev = info->dev;
struct vscsiif_sring *sring;
+ grant_ref_t gref;
int err = -ENOMEM;
/***** Frontend to Backend ring start *****/
@@ -656,14 +727,14 @@ static int scsifront_alloc_ring(struct vscsifrnt_info *info)
SHARED_RING_INIT(sring);
FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
- err = xenbus_grant_ring(dev, virt_to_mfn(sring));
+ err = xenbus_grant_ring(dev, sring, 1, &gref);
if (err < 0) {
free_page((unsigned long)sring);
xenbus_dev_fatal(dev, err,
"fail to grant shared ring (Front to Back)");
return err;
}
- info->ring_ref = err;
+ info->ring_ref = gref;
err = xenbus_alloc_evtchn(dev, &info->evtchn);
if (err) {
@@ -698,6 +769,13 @@ free_gnttab:
return err;
}
+static void scsifront_free_ring(struct vscsifrnt_info *info)
+{
+ unbind_from_irqhandler(info->irq, info);
+ gnttab_end_foreign_access(info->ring_ref, 0,
+ (unsigned long)info->ring.sring);
+}
+
static int scsifront_init_ring(struct vscsifrnt_info *info)
{
struct xenbus_device *dev = info->dev;
@@ -744,9 +822,7 @@ again:
fail:
xenbus_transaction_end(xbt, 1);
free_sring:
- unbind_from_irqhandler(info->irq, info);
- gnttab_end_foreign_access(info->ring_ref, 0,
- (unsigned long)info->ring.sring);
+ scsifront_free_ring(info);
return err;
}
@@ -779,6 +855,7 @@ static int scsifront_probe(struct xenbus_device *dev,
}
init_waitqueue_head(&info->wq_sync);
+ init_waitqueue_head(&info->wq_pause);
spin_lock_init(&info->shadow_lock);
snprintf(name, TASK_COMM_LEN, "vscsiif.%d", host->host_no);
@@ -802,13 +879,60 @@ static int scsifront_probe(struct xenbus_device *dev,
return 0;
free_sring:
- unbind_from_irqhandler(info->irq, info);
- gnttab_end_foreign_access(info->ring_ref, 0,
- (unsigned long)info->ring.sring);
+ scsifront_free_ring(info);
scsi_host_put(host);
return err;
}
+static int scsifront_resume(struct xenbus_device *dev)
+{
+ struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev);
+ struct Scsi_Host *host = info->host;
+ int err;
+
+ spin_lock_irq(host->host_lock);
+
+ /* Finish all still pending commands. */
+ scsifront_finish_all(info);
+
+ spin_unlock_irq(host->host_lock);
+
+ /* Reconnect to dom0. */
+ scsifront_free_ring(info);
+ err = scsifront_init_ring(info);
+ if (err) {
+ dev_err(&dev->dev, "fail to resume %d\n", err);
+ scsi_host_put(host);
+ return err;
+ }
+
+ xenbus_switch_state(dev, XenbusStateInitialised);
+
+ return 0;
+}
+
+static int scsifront_suspend(struct xenbus_device *dev)
+{
+ struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev);
+ struct Scsi_Host *host = info->host;
+ int err = 0;
+
+ /* No new commands for the backend. */
+ spin_lock_irq(host->host_lock);
+ info->pause = 1;
+ while (info->callers && !err) {
+ info->waiting_pause = 1;
+ info->wait_ring_available = 0;
+ spin_unlock_irq(host->host_lock);
+ wake_up(&info->wq_sync);
+ err = wait_event_interruptible(info->wq_pause,
+ !info->waiting_pause);
+ spin_lock_irq(host->host_lock);
+ }
+ spin_unlock_irq(host->host_lock);
+ return err;
+}
+
static int scsifront_remove(struct xenbus_device *dev)
{
struct vscsifrnt_info *info = dev_get_drvdata(&dev->dev);
@@ -823,10 +947,7 @@ static int scsifront_remove(struct xenbus_device *dev)
}
mutex_unlock(&scsifront_mutex);
- gnttab_end_foreign_access(info->ring_ref, 0,
- (unsigned long)info->ring.sring);
- unbind_from_irqhandler(info->irq, info);
-
+ scsifront_free_ring(info);
scsi_host_put(info->host);
return 0;
@@ -919,6 +1040,12 @@ static void scsifront_do_lun_hotplug(struct vscsifrnt_info *info, int op)
scsi_device_put(sdev);
}
break;
+ case VSCSIFRONT_OP_READD_LUN:
+ if (device_state == XenbusStateConnected)
+ xenbus_printf(XBT_NIL, dev->nodename,
+ info->dev_state_path,
+ "%d", XenbusStateConnected);
+ break;
default:
break;
}
@@ -932,21 +1059,29 @@ static void scsifront_do_lun_hotplug(struct vscsifrnt_info *info, int op)
static void scsifront_read_backend_params(struct xenbus_device *dev,
struct vscsifrnt_info *info)
{
- unsigned int sg_grant;
+ unsigned int sg_grant, nr_segs;
int ret;
struct Scsi_Host *host = info->host;
ret = xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg-grant", "%u",
&sg_grant);
- if (ret == 1 && sg_grant) {
- sg_grant = min_t(unsigned int, sg_grant, SG_ALL);
- sg_grant = max_t(unsigned int, sg_grant, VSCSIIF_SG_TABLESIZE);
- host->sg_tablesize = min_t(unsigned int, sg_grant,
+ if (ret != 1)
+ sg_grant = 0;
+ nr_segs = min_t(unsigned int, sg_grant, SG_ALL);
+ nr_segs = max_t(unsigned int, nr_segs, VSCSIIF_SG_TABLESIZE);
+ nr_segs = min_t(unsigned int, nr_segs,
VSCSIIF_SG_TABLESIZE * PAGE_SIZE /
sizeof(struct scsiif_request_segment));
- host->max_sectors = (host->sg_tablesize - 1) * PAGE_SIZE / 512;
- }
- dev_info(&dev->dev, "using up to %d SG entries\n", host->sg_tablesize);
+
+ if (!info->pause && sg_grant)
+ dev_info(&dev->dev, "using up to %d SG entries\n", nr_segs);
+ else if (info->pause && nr_segs < host->sg_tablesize)
+ dev_warn(&dev->dev,
+ "SG entries decreased from %d to %u - device may not work properly anymore\n",
+ host->sg_tablesize, nr_segs);
+
+ host->sg_tablesize = nr_segs;
+ host->max_sectors = (nr_segs - 1) * PAGE_SIZE / 512;
}
static void scsifront_backend_changed(struct xenbus_device *dev,
@@ -965,6 +1100,14 @@ static void scsifront_backend_changed(struct xenbus_device *dev,
case XenbusStateConnected:
scsifront_read_backend_params(dev, info);
+
+ if (info->pause) {
+ scsifront_do_lun_hotplug(info, VSCSIFRONT_OP_READD_LUN);
+ xenbus_switch_state(dev, XenbusStateConnected);
+ info->pause = 0;
+ return;
+ }
+
if (xenbus_read_driver_state(dev->nodename) ==
XenbusStateInitialised)
scsifront_do_lun_hotplug(info, VSCSIFRONT_OP_ADD_LUN);
@@ -1002,6 +1145,8 @@ static struct xenbus_driver scsifront_driver = {
.ids = scsifront_ids,
.probe = scsifront_probe,
.remove = scsifront_remove,
+ .resume = scsifront_resume,
+ .suspend = scsifront_suspend,
.otherend_changed = scsifront_backend_changed,
};
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 94d96809e686..a270004c9605 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -270,4 +270,10 @@ config XEN_EFI
def_bool y
depends on X86_64 && EFI
+config XEN_AUTO_XLATE
+ def_bool y
+ depends on ARM || ARM64 || XEN_PVHVM
+ help
+ Support for auto-translated physmap guests.
+
endmenu
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 2ccd3592d41f..40edd1cbb60d 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_XEN_ACPI_HOTPLUG_CPU) += xen-acpi-cpuhotplug.o
obj-$(CONFIG_XEN_ACPI_PROCESSOR) += xen-acpi-processor.o
obj-$(CONFIG_XEN_EFI) += efi.o
obj-$(CONFIG_XEN_SCSI_BACKEND) += xen-scsiback.o
+obj-$(CONFIG_XEN_AUTO_XLATE) += xlate_mmu.o
xen-evtchn-y := evtchn.o
xen-gntdev-y := gntdev.o
xen-gntalloc-y := gntalloc.o
diff --git a/drivers/xen/mcelog.c b/drivers/xen/mcelog.c
index 6ab6a79c38a5..a493c7315e94 100644
--- a/drivers/xen/mcelog.c
+++ b/drivers/xen/mcelog.c
@@ -393,14 +393,25 @@ static int bind_virq_for_mce(void)
static int __init xen_late_init_mcelog(void)
{
+ int ret;
+
/* Only DOM0 is responsible for MCE logging */
- if (xen_initial_domain()) {
- /* register character device /dev/mcelog for xen mcelog */
- if (misc_register(&xen_mce_chrdev_device))
- return -ENODEV;
- return bind_virq_for_mce();
- }
+ if (!xen_initial_domain())
+ return -ENODEV;
+
+ /* register character device /dev/mcelog for xen mcelog */
+ ret = misc_register(&xen_mce_chrdev_device);
+ if (ret)
+ return ret;
+
+ ret = bind_virq_for_mce();
+ if (ret)
+ goto deregister;
- return -ENODEV;
+ return 0;
+
+deregister:
+ misc_deregister(&xen_mce_chrdev_device);
+ return ret;
}
device_initcall(xen_late_init_mcelog);
diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index 95ee4302ffb8..7494dbeb4409 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -19,6 +19,7 @@
#include <linux/pci.h>
#include <linux/acpi.h>
+#include <linux/pci-acpi.h>
#include <xen/xen.h>
#include <xen/interface/physdev.h>
#include <xen/interface/xen.h>
@@ -67,12 +68,22 @@ static int xen_add_device(struct device *dev)
#ifdef CONFIG_ACPI
handle = ACPI_HANDLE(&pci_dev->dev);
- if (!handle && pci_dev->bus->bridge)
- handle = ACPI_HANDLE(pci_dev->bus->bridge);
#ifdef CONFIG_PCI_IOV
if (!handle && pci_dev->is_virtfn)
handle = ACPI_HANDLE(physfn->bus->bridge);
#endif
+ if (!handle) {
+ /*
+ * This device was not listed in the ACPI name space at
+ * all. Try to get acpi handle of parent pci bus.
+ */
+ struct pci_bus *pbus;
+ for (pbus = pci_dev->bus; pbus; pbus = pbus->parent) {
+ handle = acpi_pci_get_bridge_handle(pbus);
+ if (handle)
+ break;
+ }
+ }
if (handle) {
acpi_status status;
diff --git a/drivers/xen/pcpu.c b/drivers/xen/pcpu.c
index 0aac403d53fd..49e88f2ce7a1 100644
--- a/drivers/xen/pcpu.c
+++ b/drivers/xen/pcpu.c
@@ -132,6 +132,33 @@ static ssize_t __ref store_online(struct device *dev,
}
static DEVICE_ATTR(online, S_IRUGO | S_IWUSR, show_online, store_online);
+static struct attribute *pcpu_dev_attrs[] = {
+ &dev_attr_online.attr,
+ NULL
+};
+
+static umode_t pcpu_dev_is_visible(struct kobject *kobj,
+ struct attribute *attr, int idx)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ /*
+ * Xen never offline cpu0 due to several restrictions
+ * and assumptions. This basically doesn't add a sys control
+ * to user, one cannot attempt to offline BSP.
+ */
+ return dev->id ? attr->mode : 0;
+}
+
+static const struct attribute_group pcpu_dev_group = {
+ .attrs = pcpu_dev_attrs,
+ .is_visible = pcpu_dev_is_visible,
+};
+
+static const struct attribute_group *pcpu_dev_groups[] = {
+ &pcpu_dev_group,
+ NULL
+};
+
static bool xen_pcpu_online(uint32_t flags)
{
return !!(flags & XEN_PCPU_FLAGS_ONLINE);
@@ -181,9 +208,6 @@ static void unregister_and_remove_pcpu(struct pcpu *pcpu)
return;
dev = &pcpu->dev;
- if (dev->id)
- device_remove_file(dev, &dev_attr_online);
-
/* pcpu remove would be implicitly done */
device_unregister(dev);
}
@@ -200,6 +224,7 @@ static int register_pcpu(struct pcpu *pcpu)
dev->bus = &xen_pcpu_subsys;
dev->id = pcpu->cpu_id;
dev->release = pcpu_release;
+ dev->groups = pcpu_dev_groups;
err = device_register(dev);
if (err) {
@@ -207,19 +232,6 @@ static int register_pcpu(struct pcpu *pcpu)
return err;
}
- /*
- * Xen never offline cpu0 due to several restrictions
- * and assumptions. This basically doesn't add a sys control
- * to user, one cannot attempt to offline BSP.
- */
- if (dev->id) {
- err = device_create_file(dev, &dev_attr_online);
- if (err) {
- device_unregister(dev);
- return err;
- }
- }
-
return 0;
}
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 59ac71c4a043..5a296161d843 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -159,6 +159,40 @@ static int traverse_pages(unsigned nelem, size_t size,
return ret;
}
+/*
+ * Similar to traverse_pages, but use each page as a "block" of
+ * data to be processed as one unit.
+ */
+static int traverse_pages_block(unsigned nelem, size_t size,
+ struct list_head *pos,
+ int (*fn)(void *data, int nr, void *state),
+ void *state)
+{
+ void *pagedata;
+ unsigned pageidx;
+ int ret = 0;
+
+ BUG_ON(size > PAGE_SIZE);
+
+ pageidx = PAGE_SIZE;
+
+ while (nelem) {
+ int nr = (PAGE_SIZE/size);
+ struct page *page;
+ if (nr > nelem)
+ nr = nelem;
+ pos = pos->next;
+ page = list_entry(pos, struct page, lru);
+ pagedata = page_address(page);
+ ret = (*fn)(pagedata, nr, state);
+ if (ret)
+ break;
+ nelem -= nr;
+ }
+
+ return ret;
+}
+
struct mmap_mfn_state {
unsigned long va;
struct vm_area_struct *vma;
@@ -274,39 +308,25 @@ struct mmap_batch_state {
/* auto translated dom0 note: if domU being created is PV, then mfn is
* mfn(addr on bus). If it's auto xlated, then mfn is pfn (input to HAP).
*/
-static int mmap_batch_fn(void *data, void *state)
+static int mmap_batch_fn(void *data, int nr, void *state)
{
xen_pfn_t *mfnp = data;
struct mmap_batch_state *st = state;
struct vm_area_struct *vma = st->vma;
struct page **pages = vma->vm_private_data;
- struct page *cur_page = NULL;
+ struct page **cur_pages = NULL;
int ret;
if (xen_feature(XENFEAT_auto_translated_physmap))
- cur_page = pages[st->index++];
+ cur_pages = &pages[st->index];
- ret = xen_remap_domain_mfn_range(st->vma, st->va & PAGE_MASK, *mfnp, 1,
- st->vma->vm_page_prot, st->domain,
- &cur_page);
+ BUG_ON(nr < 0);
+ ret = xen_remap_domain_mfn_array(st->vma, st->va & PAGE_MASK, mfnp, nr,
+ (int *)mfnp, st->vma->vm_page_prot,
+ st->domain, cur_pages);
- /* Store error code for second pass. */
- if (st->version == 1) {
- if (ret < 0) {
- /*
- * V1 encodes the error codes in the 32bit top nibble of the
- * mfn (with its known limitations vis-a-vis 64 bit callers).
- */
- *mfnp |= (ret == -ENOENT) ?
- PRIVCMD_MMAPBATCH_PAGED_ERROR :
- PRIVCMD_MMAPBATCH_MFN_ERROR;
- }
- } else { /* st->version == 2 */
- *((int *) mfnp) = ret;
- }
-
- /* And see if it affects the global_error. */
- if (ret < 0) {
+ /* Adjust the global_error? */
+ if (ret != nr) {
if (ret == -ENOENT)
st->global_error = -ENOENT;
else {
@@ -315,23 +335,35 @@ static int mmap_batch_fn(void *data, void *state)
st->global_error = 1;
}
}
- st->va += PAGE_SIZE;
+ st->va += PAGE_SIZE * nr;
+ st->index += nr;
return 0;
}
-static int mmap_return_errors(void *data, void *state)
+static int mmap_return_error(int err, struct mmap_batch_state *st)
{
- struct mmap_batch_state *st = state;
+ int ret;
if (st->version == 1) {
- xen_pfn_t mfnp = *((xen_pfn_t *) data);
- if (mfnp & PRIVCMD_MMAPBATCH_MFN_ERROR)
- return __put_user(mfnp, st->user_mfn++);
- else
+ if (err) {
+ xen_pfn_t mfn;
+
+ ret = get_user(mfn, st->user_mfn);
+ if (ret < 0)
+ return ret;
+ /*
+ * V1 encodes the error codes in the 32bit top
+ * nibble of the mfn (with its known
+ * limitations vis-a-vis 64 bit callers).
+ */
+ mfn |= (err == -ENOENT) ?
+ PRIVCMD_MMAPBATCH_PAGED_ERROR :
+ PRIVCMD_MMAPBATCH_MFN_ERROR;
+ return __put_user(mfn, st->user_mfn++);
+ } else
st->user_mfn++;
} else { /* st->version == 2 */
- int err = *((int *) data);
if (err)
return __put_user(err, st->user_err++);
else
@@ -341,6 +373,21 @@ static int mmap_return_errors(void *data, void *state)
return 0;
}
+static int mmap_return_errors(void *data, int nr, void *state)
+{
+ struct mmap_batch_state *st = state;
+ int *errs = data;
+ int i;
+ int ret;
+
+ for (i = 0; i < nr; i++) {
+ ret = mmap_return_error(errs[i], st);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
/* Allocate pfns that are then mapped with gmfns from foreign domid. Update
* the vma with the page info to use later.
* Returns: 0 if success, otherwise -errno
@@ -472,8 +519,8 @@ static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
state.version = version;
/* mmap_batch_fn guarantees ret == 0 */
- BUG_ON(traverse_pages(m.num, sizeof(xen_pfn_t),
- &pagelist, mmap_batch_fn, &state));
+ BUG_ON(traverse_pages_block(m.num, sizeof(xen_pfn_t),
+ &pagelist, mmap_batch_fn, &state));
up_write(&mm->mmap_sem);
@@ -481,8 +528,8 @@ static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
/* Write back errors in second pass. */
state.user_mfn = (xen_pfn_t *)m.arr;
state.user_err = m.err;
- ret = traverse_pages(m.num, sizeof(xen_pfn_t),
- &pagelist, mmap_return_errors, &state);
+ ret = traverse_pages_block(m.num, sizeof(xen_pfn_t),
+ &pagelist, mmap_return_errors, &state);
} else
ret = 0;
diff --git a/drivers/xen/xen-balloon.c b/drivers/xen/xen-balloon.c
index e555845d61fa..39e7ef8d3957 100644
--- a/drivers/xen/xen-balloon.c
+++ b/drivers/xen/xen-balloon.c
@@ -193,13 +193,18 @@ static DEVICE_ATTR(target, S_IRUGO | S_IWUSR,
show_target, store_target);
-static struct device_attribute *balloon_attrs[] = {
- &dev_attr_target_kb,
- &dev_attr_target,
- &dev_attr_schedule_delay.attr,
- &dev_attr_max_schedule_delay.attr,
- &dev_attr_retry_count.attr,
- &dev_attr_max_retry_count.attr
+static struct attribute *balloon_attrs[] = {
+ &dev_attr_target_kb.attr,
+ &dev_attr_target.attr,
+ &dev_attr_schedule_delay.attr.attr,
+ &dev_attr_max_schedule_delay.attr.attr,
+ &dev_attr_retry_count.attr.attr,
+ &dev_attr_max_retry_count.attr.attr,
+ NULL
+};
+
+static const struct attribute_group balloon_group = {
+ .attrs = balloon_attrs
};
static struct attribute *balloon_info_attrs[] = {
@@ -214,6 +219,12 @@ static const struct attribute_group balloon_info_group = {
.attrs = balloon_info_attrs
};
+static const struct attribute_group *balloon_groups[] = {
+ &balloon_group,
+ &balloon_info_group,
+ NULL
+};
+
static struct bus_type balloon_subsys = {
.name = BALLOON_CLASS_NAME,
.dev_name = BALLOON_CLASS_NAME,
@@ -221,7 +232,7 @@ static struct bus_type balloon_subsys = {
static int register_balloon(struct device *dev)
{
- int i, error;
+ int error;
error = subsys_system_register(&balloon_subsys, NULL);
if (error)
@@ -229,6 +240,7 @@ static int register_balloon(struct device *dev)
dev->id = 0;
dev->bus = &balloon_subsys;
+ dev->groups = balloon_groups;
error = device_register(dev);
if (error) {
@@ -236,24 +248,7 @@ static int register_balloon(struct device *dev)
return error;
}
- for (i = 0; i < ARRAY_SIZE(balloon_attrs); i++) {
- error = device_create_file(dev, balloon_attrs[i]);
- if (error)
- goto fail;
- }
-
- error = sysfs_create_group(&dev->kobj, &balloon_info_group);
- if (error)
- goto fail;
-
return 0;
-
- fail:
- while (--i >= 0)
- device_remove_file(dev, balloon_attrs[i]);
- device_unregister(dev);
- bus_unregister(&balloon_subsys);
- return error;
}
MODULE_LICENSE("GPL");
diff --git a/drivers/xen/xen-pciback/conf_space_header.c b/drivers/xen/xen-pciback/conf_space_header.c
index 2d7369391472..c2260a0456c9 100644
--- a/drivers/xen/xen-pciback/conf_space_header.c
+++ b/drivers/xen/xen-pciback/conf_space_header.c
@@ -88,9 +88,15 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data)
printk(KERN_DEBUG DRV_NAME ": %s: set bus master\n",
pci_name(dev));
pci_set_master(dev);
+ } else if (dev->is_busmaster && !is_master_cmd(value)) {
+ if (unlikely(verbose_request))
+ printk(KERN_DEBUG DRV_NAME ": %s: clear bus master\n",
+ pci_name(dev));
+ pci_clear_master(dev);
}
- if (value & PCI_COMMAND_INVALIDATE) {
+ if (!(cmd->val & PCI_COMMAND_INVALIDATE) &&
+ (value & PCI_COMMAND_INVALIDATE)) {
if (unlikely(verbose_request))
printk(KERN_DEBUG
DRV_NAME ": %s: enable memory-write-invalidate\n",
@@ -101,6 +107,13 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data)
pci_name(dev), err);
value &= ~PCI_COMMAND_INVALIDATE;
}
+ } else if ((cmd->val & PCI_COMMAND_INVALIDATE) &&
+ !(value & PCI_COMMAND_INVALIDATE)) {
+ if (unlikely(verbose_request))
+ printk(KERN_DEBUG
+ DRV_NAME ": %s: disable memory-write-invalidate\n",
+ pci_name(dev));
+ pci_clear_mwi(dev);
}
cmd->val = value;
diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index cc3cbb4435f8..258b7c325649 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -118,7 +118,7 @@ static void pcistub_device_release(struct kref *kref)
int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix,
&ppdev);
- if (err)
+ if (err && err != -ENOSYS)
dev_warn(&dev->dev, "MSI-X release failed (%d)\n",
err);
}
@@ -402,7 +402,7 @@ static int pcistub_init_device(struct pci_dev *dev)
};
err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev);
- if (err)
+ if (err && err != -ENOSYS)
dev_err(&dev->dev, "MSI-X preparation failed (%d)\n",
err);
}
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index fe17c80ff4b7..98bc345f296e 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -113,7 +113,7 @@ static int xen_pcibk_do_attach(struct xen_pcibk_device *pdev, int gnt_ref,
"Attaching to frontend resources - gnt_ref=%d evtchn=%d\n",
gnt_ref, remote_evtchn);
- err = xenbus_map_ring_valloc(pdev->xdev, gnt_ref, &vaddr);
+ err = xenbus_map_ring_valloc(pdev->xdev, &gnt_ref, 1, &vaddr);
if (err < 0) {
xenbus_dev_fatal(pdev->xdev, err,
"Error mapping other domain page in ours.");
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 42bd55a6c237..07ef38325223 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -31,6 +31,8 @@
* IN THE SOFTWARE.
*/
+#define pr_fmt(fmt) "xen-pvscsi: " fmt
+
#include <stdarg.h>
#include <linux/module.h>
@@ -69,9 +71,6 @@
#include <xen/interface/grant_table.h>
#include <xen/interface/io/vscsiif.h>
-#define DPRINTK(_f, _a...) \
- pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a)
-
#define VSCSI_VERSION "v0.1"
#define VSCSI_NAMELEN 32
@@ -271,7 +270,7 @@ static void scsiback_print_status(char *sense_buffer, int errors,
{
struct scsiback_tpg *tpg = pending_req->v2p->tpg;
- pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
+ pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
tpg->tport->tport_name, pending_req->v2p->lun,
pending_req->cmnd[0], status_byte(errors), msg_byte(errors),
host_byte(errors), driver_byte(errors));
@@ -427,7 +426,7 @@ static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
BUG_ON(err);
for (i = 0; i < cnt; i++) {
if (unlikely(map[i].status != GNTST_okay)) {
- pr_err("xen-pvscsi: invalid buffer -- could not remap it\n");
+ pr_err("invalid buffer -- could not remap it\n");
map[i].handle = SCSIBACK_INVALID_HANDLE;
err = -ENOMEM;
} else {
@@ -449,7 +448,7 @@ static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req,
for (i = 0; i < cnt; i++) {
if (get_free_page(pg + mapcount)) {
put_free_pages(pg, mapcount);
- pr_err("xen-pvscsi: no grant page\n");
+ pr_err("no grant page\n");
return -ENOMEM;
}
gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
@@ -492,7 +491,7 @@ static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
return 0;
if (nr_segments > VSCSIIF_SG_TABLESIZE) {
- DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n",
+ pr_debug("invalid parameter nr_seg = %d\n",
ring_req->nr_segments);
return -EINVAL;
}
@@ -516,13 +515,12 @@ static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
nr_segments += n_segs;
}
if (nr_segments > SG_ALL) {
- DPRINTK("xen-pvscsi: invalid nr_seg = %d\n",
- nr_segments);
+ pr_debug("invalid nr_seg = %d\n", nr_segments);
return -EINVAL;
}
}
- /* free of (sgl) in fast_flush_area()*/
+ /* free of (sgl) in fast_flush_area() */
pending_req->sgl = kmalloc_array(nr_segments,
sizeof(struct scatterlist), GFP_KERNEL);
if (!pending_req->sgl)
@@ -679,7 +677,8 @@ static int prepare_pending_reqs(struct vscsibk_info *info,
v2p = scsiback_do_translation(info, &vir);
if (!v2p) {
pending_req->v2p = NULL;
- DPRINTK("xen-pvscsi: doesn't exist.\n");
+ pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n",
+ vir.chn, vir.tgt, vir.lun);
return -ENODEV;
}
pending_req->v2p = v2p;
@@ -690,14 +689,14 @@ static int prepare_pending_reqs(struct vscsibk_info *info,
(pending_req->sc_data_direction != DMA_TO_DEVICE) &&
(pending_req->sc_data_direction != DMA_FROM_DEVICE) &&
(pending_req->sc_data_direction != DMA_NONE)) {
- DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n",
+ pr_debug("invalid parameter data_dir = %d\n",
pending_req->sc_data_direction);
return -EINVAL;
}
pending_req->cmd_len = ring_req->cmd_len;
if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
- DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n",
+ pr_debug("invalid parameter cmd_len = %d\n",
pending_req->cmd_len);
return -EINVAL;
}
@@ -721,7 +720,7 @@ static int scsiback_do_cmd_fn(struct vscsibk_info *info)
if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) {
rc = ring->rsp_prod_pvt;
- pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
+ pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
info->domid, rp, rc, rp - rc);
info->ring_error = 1;
return 0;
@@ -772,7 +771,7 @@ static int scsiback_do_cmd_fn(struct vscsibk_info *info)
scsiback_device_action(pending_req, TMR_LUN_RESET, 0);
break;
default:
- pr_err_ratelimited("xen-pvscsi: invalid request\n");
+ pr_err_ratelimited("invalid request\n");
scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24,
0, pending_req);
kmem_cache_free(scsiback_cachep, pending_req);
@@ -810,7 +809,7 @@ static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref,
if (info->irq)
return -1;
- err = xenbus_map_ring_valloc(info->dev, ring_ref, &area);
+ err = xenbus_map_ring_valloc(info->dev, &ring_ref, 1, &area);
if (err)
return err;
@@ -874,14 +873,13 @@ static int scsiback_add_translation_entry(struct vscsibk_info *info,
lunp = strrchr(phy, ':');
if (!lunp) {
- pr_err("xen-pvscsi: illegal format of physical device %s\n",
- phy);
+ pr_err("illegal format of physical device %s\n", phy);
return -EINVAL;
}
*lunp = 0;
lunp++;
if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
- pr_err("xen-pvscsi: lun number not valid: %s\n", lunp);
+ pr_err("lun number not valid: %s\n", lunp);
return -EINVAL;
}
@@ -909,7 +907,7 @@ static int scsiback_add_translation_entry(struct vscsibk_info *info,
mutex_unlock(&scsiback_mutex);
if (!tpg) {
- pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error);
+ pr_err("%s:%d %s\n", phy, lun, error);
return -ENODEV;
}
@@ -926,7 +924,7 @@ static int scsiback_add_translation_entry(struct vscsibk_info *info,
if ((entry->v.chn == v->chn) &&
(entry->v.tgt == v->tgt) &&
(entry->v.lun == v->lun)) {
- pr_warn("xen-pvscsi: Virtual ID is already used. Assignment was not performed.\n");
+ pr_warn("Virtual ID is already used. Assignment was not performed.\n");
err = -EEXIST;
goto out;
}
@@ -992,15 +990,15 @@ found:
}
static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
- char *phy, struct ids_tuple *vir)
+ char *phy, struct ids_tuple *vir, int try)
{
if (!scsiback_add_translation_entry(info, phy, vir)) {
if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
"%d", XenbusStateInitialised)) {
- pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+ pr_err("xenbus_printf error %s\n", state);
scsiback_del_translation_entry(info, vir);
}
- } else {
+ } else if (!try) {
xenbus_printf(XBT_NIL, info->dev->nodename, state,
"%d", XenbusStateClosed);
}
@@ -1012,7 +1010,7 @@ static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state,
if (!scsiback_del_translation_entry(info, vir)) {
if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
"%d", XenbusStateClosed))
- pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+ pr_err("xenbus_printf error %s\n", state);
}
}
@@ -1060,10 +1058,19 @@ static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
switch (op) {
case VSCSIBACK_OP_ADD_OR_DEL_LUN:
- if (device_state == XenbusStateInitialising)
- scsiback_do_add_lun(info, state, phy, &vir);
- if (device_state == XenbusStateClosing)
+ switch (device_state) {
+ case XenbusStateInitialising:
+ scsiback_do_add_lun(info, state, phy, &vir, 0);
+ break;
+ case XenbusStateConnected:
+ scsiback_do_add_lun(info, state, phy, &vir, 1);
+ break;
+ case XenbusStateClosing:
scsiback_do_del_lun(info, state, &vir);
+ break;
+ default:
+ break;
+ }
break;
case VSCSIBACK_OP_UPDATEDEV_STATE:
@@ -1071,15 +1078,14 @@ static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
/* modify vscsi-devs/dev-x/state */
if (xenbus_printf(XBT_NIL, dev->nodename, state,
"%d", XenbusStateConnected)) {
- pr_err("xen-pvscsi: xenbus_printf error %s\n",
- str);
+ pr_err("xenbus_printf error %s\n", str);
scsiback_del_translation_entry(info, &vir);
xenbus_printf(XBT_NIL, dev->nodename, state,
"%d", XenbusStateClosed);
}
}
break;
- /*When it is necessary, processing is added here.*/
+ /* When it is necessary, processing is added here. */
default:
break;
}
@@ -1196,7 +1202,7 @@ static int scsiback_probe(struct xenbus_device *dev,
struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info),
GFP_KERNEL);
- DPRINTK("%p %d\n", dev, dev->otherend_id);
+ pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id);
if (!info) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure");
@@ -1227,7 +1233,7 @@ static int scsiback_probe(struct xenbus_device *dev,
return 0;
fail:
- pr_warn("xen-pvscsi: %s failed\n", __func__);
+ pr_warn("%s failed\n", __func__);
scsiback_remove(dev);
return err;
@@ -1432,7 +1438,7 @@ check_len:
}
snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]);
- pr_debug("xen-pvscsi: Allocated emulated Target %s Address: %s\n",
+ pr_debug("Allocated emulated Target %s Address: %s\n",
scsiback_dump_proto_id(tport), name);
return &tport->tport_wwn;
@@ -1443,7 +1449,7 @@ static void scsiback_drop_tport(struct se_wwn *wwn)
struct scsiback_tport *tport = container_of(wwn,
struct scsiback_tport, tport_wwn);
- pr_debug("xen-pvscsi: Deallocating emulated Target %s Address: %s\n",
+ pr_debug("Deallocating emulated Target %s Address: %s\n",
scsiback_dump_proto_id(tport), tport->tport_name);
kfree(tport);
@@ -1470,8 +1476,8 @@ static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg)
static int scsiback_check_stop_free(struct se_cmd *se_cmd)
{
/*
- * Do not release struct se_cmd's containing a valid TMR
- * pointer. These will be released directly in scsiback_device_action()
+ * Do not release struct se_cmd's containing a valid TMR pointer.
+ * These will be released directly in scsiback_device_action()
* with transport_generic_free_cmd().
*/
if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
@@ -1637,7 +1643,7 @@ static int scsiback_make_nexus(struct scsiback_tpg *tpg,
return -ENOMEM;
}
/*
- * Initialize the struct se_session pointer
+ * Initialize the struct se_session pointer
*/
tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
if (IS_ERR(tv_nexus->tvn_se_sess)) {
@@ -1705,7 +1711,7 @@ static int scsiback_drop_nexus(struct scsiback_tpg *tpg)
return -EBUSY;
}
- pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
+ pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n",
scsiback_dump_proto_id(tpg->tport),
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
@@ -1751,7 +1757,7 @@ static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg,
unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr;
int ret;
/*
- * Shutdown the active I_T nexus if 'NULL' is passed..
+ * Shutdown the active I_T nexus if 'NULL' is passed.
*/
if (!strncmp(page, "NULL", 4)) {
ret = scsiback_drop_nexus(tpg);
@@ -1922,7 +1928,7 @@ static void scsiback_drop_tpg(struct se_portal_group *se_tpg)
*/
scsiback_drop_nexus(tpg);
/*
- * Deregister the se_tpg from TCM..
+ * Deregister the se_tpg from TCM.
*/
core_tpg_deregister(se_tpg);
kfree(tpg);
@@ -1992,7 +1998,7 @@ static int scsiback_register_configfs(void)
struct target_fabric_configfs *fabric;
int ret;
- pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
+ pr_debug("fabric module %s on %s/%s on "UTS_RELEASE"\n",
VSCSI_VERSION, utsname()->sysname, utsname()->machine);
/*
* Register the top level struct config_item_type with TCM core
@@ -2029,7 +2035,7 @@ static int scsiback_register_configfs(void)
* Setup our local pointer to *fabric
*/
scsiback_fabric_configfs = fabric;
- pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n");
+ pr_debug("Set fabric -> scsiback_fabric_configfs\n");
return 0;
};
@@ -2040,7 +2046,7 @@ static void scsiback_deregister_configfs(void)
target_fabric_configfs_deregister(scsiback_fabric_configfs);
scsiback_fabric_configfs = NULL;
- pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n");
+ pr_debug("Cleared scsiback_fabric_configfs\n");
};
static const struct xenbus_device_id scsiback_ids[] = {
@@ -2091,7 +2097,7 @@ out_unregister_xenbus:
xenbus_unregister_driver(&scsiback_driver);
out_cache_destroy:
kmem_cache_destroy(scsiback_cachep);
- pr_err("xen-pvscsi: %s: error %d\n", __func__, ret);
+ pr_err("%s: error %d\n", __func__, ret);
return ret;
}
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index ca744102b666..96b2011d25f3 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -52,17 +52,25 @@
struct xenbus_map_node {
struct list_head next;
union {
- struct vm_struct *area; /* PV */
- struct page *page; /* HVM */
+ struct {
+ struct vm_struct *area;
+ } pv;
+ struct {
+ struct page *pages[XENBUS_MAX_RING_PAGES];
+ void *addr;
+ } hvm;
};
- grant_handle_t handle;
+ grant_handle_t handles[XENBUS_MAX_RING_PAGES];
+ unsigned int nr_handles;
};
static DEFINE_SPINLOCK(xenbus_valloc_lock);
static LIST_HEAD(xenbus_valloc_pages);
struct xenbus_ring_ops {
- int (*map)(struct xenbus_device *dev, int gnt, void **vaddr);
+ int (*map)(struct xenbus_device *dev,
+ grant_ref_t *gnt_refs, unsigned int nr_grefs,
+ void **vaddr);
int (*unmap)(struct xenbus_device *dev, void *vaddr);
};
@@ -355,17 +363,39 @@ static void xenbus_switch_fatal(struct xenbus_device *dev, int depth, int err,
/**
* xenbus_grant_ring
* @dev: xenbus device
- * @ring_mfn: mfn of ring to grant
-
- * Grant access to the given @ring_mfn to the peer of the given device. Return
- * a grant reference on success, or -errno on error. On error, the device will
- * switch to XenbusStateClosing, and the error will be saved in the store.
+ * @vaddr: starting virtual address of the ring
+ * @nr_pages: number of pages to be granted
+ * @grefs: grant reference array to be filled in
+ *
+ * Grant access to the given @vaddr to the peer of the given device.
+ * Then fill in @grefs with grant references. Return 0 on success, or
+ * -errno on error. On error, the device will switch to
+ * XenbusStateClosing, and the error will be saved in the store.
*/
-int xenbus_grant_ring(struct xenbus_device *dev, unsigned long ring_mfn)
+int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr,
+ unsigned int nr_pages, grant_ref_t *grefs)
{
- int err = gnttab_grant_foreign_access(dev->otherend_id, ring_mfn, 0);
- if (err < 0)
- xenbus_dev_fatal(dev, err, "granting access to ring page");
+ int err;
+ int i, j;
+
+ for (i = 0; i < nr_pages; i++) {
+ unsigned long addr = (unsigned long)vaddr +
+ (PAGE_SIZE * i);
+ err = gnttab_grant_foreign_access(dev->otherend_id,
+ virt_to_mfn(addr), 0);
+ if (err < 0) {
+ xenbus_dev_fatal(dev, err,
+ "granting access to ring page");
+ goto fail;
+ }
+ grefs[i] = err;
+ }
+
+ return 0;
+
+fail:
+ for (j = 0; j < i; j++)
+ gnttab_end_foreign_access_ref(grefs[j], 0);
return err;
}
EXPORT_SYMBOL_GPL(xenbus_grant_ring);
@@ -419,62 +449,130 @@ EXPORT_SYMBOL_GPL(xenbus_free_evtchn);
/**
* xenbus_map_ring_valloc
* @dev: xenbus device
- * @gnt_ref: grant reference
+ * @gnt_refs: grant reference array
+ * @nr_grefs: number of grant references
* @vaddr: pointer to address to be filled out by mapping
*
- * Based on Rusty Russell's skeleton driver's map_page.
- * Map a page of memory into this domain from another domain's grant table.
- * xenbus_map_ring_valloc allocates a page of virtual address space, maps the
- * page to that address, and sets *vaddr to that address.
- * Returns 0 on success, and GNTST_* (see xen/include/interface/grant_table.h)
- * or -ENOMEM on error. If an error is returned, device will switch to
+ * Map @nr_grefs pages of memory into this domain from another
+ * domain's grant table. xenbus_map_ring_valloc allocates @nr_grefs
+ * pages of virtual address space, maps the pages to that address, and
+ * sets *vaddr to that address. Returns 0 on success, and GNTST_*
+ * (see xen/include/interface/grant_table.h) or -ENOMEM / -EINVAL on
+ * error. If an error is returned, device will switch to
* XenbusStateClosing and the error message will be saved in XenStore.
*/
-int xenbus_map_ring_valloc(struct xenbus_device *dev, int gnt_ref, void **vaddr)
+int xenbus_map_ring_valloc(struct xenbus_device *dev, grant_ref_t *gnt_refs,
+ unsigned int nr_grefs, void **vaddr)
{
- return ring_ops->map(dev, gnt_ref, vaddr);
+ return ring_ops->map(dev, gnt_refs, nr_grefs, vaddr);
}
EXPORT_SYMBOL_GPL(xenbus_map_ring_valloc);
+/* N.B. sizeof(phys_addr_t) doesn't always equal to sizeof(unsigned
+ * long), e.g. 32-on-64. Caller is responsible for preparing the
+ * right array to feed into this function */
+static int __xenbus_map_ring(struct xenbus_device *dev,
+ grant_ref_t *gnt_refs,
+ unsigned int nr_grefs,
+ grant_handle_t *handles,
+ phys_addr_t *addrs,
+ unsigned int flags,
+ bool *leaked)
+{
+ struct gnttab_map_grant_ref map[XENBUS_MAX_RING_PAGES];
+ struct gnttab_unmap_grant_ref unmap[XENBUS_MAX_RING_PAGES];
+ int i, j;
+ int err = GNTST_okay;
+
+ if (nr_grefs > XENBUS_MAX_RING_PAGES)
+ return -EINVAL;
+
+ for (i = 0; i < nr_grefs; i++) {
+ memset(&map[i], 0, sizeof(map[i]));
+ gnttab_set_map_op(&map[i], addrs[i], flags, gnt_refs[i],
+ dev->otherend_id);
+ handles[i] = INVALID_GRANT_HANDLE;
+ }
+
+ gnttab_batch_map(map, i);
+
+ for (i = 0; i < nr_grefs; i++) {
+ if (map[i].status != GNTST_okay) {
+ err = map[i].status;
+ xenbus_dev_fatal(dev, map[i].status,
+ "mapping in shared page %d from domain %d",
+ gnt_refs[i], dev->otherend_id);
+ goto fail;
+ } else
+ handles[i] = map[i].handle;
+ }
+
+ return GNTST_okay;
+
+ fail:
+ for (i = j = 0; i < nr_grefs; i++) {
+ if (handles[i] != INVALID_GRANT_HANDLE) {
+ memset(&unmap[j], 0, sizeof(unmap[j]));
+ gnttab_set_unmap_op(&unmap[j], (phys_addr_t)addrs[i],
+ GNTMAP_host_map, handles[i]);
+ j++;
+ }
+ }
+
+ if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap, j))
+ BUG();
+
+ *leaked = false;
+ for (i = 0; i < j; i++) {
+ if (unmap[i].status != GNTST_okay) {
+ *leaked = true;
+ break;
+ }
+ }
+
+ return err;
+}
+
static int xenbus_map_ring_valloc_pv(struct xenbus_device *dev,
- int gnt_ref, void **vaddr)
+ grant_ref_t *gnt_refs,
+ unsigned int nr_grefs,
+ void **vaddr)
{
- struct gnttab_map_grant_ref op = {
- .flags = GNTMAP_host_map | GNTMAP_contains_pte,
- .ref = gnt_ref,
- .dom = dev->otherend_id,
- };
struct xenbus_map_node *node;
struct vm_struct *area;
- pte_t *pte;
+ pte_t *ptes[XENBUS_MAX_RING_PAGES];
+ phys_addr_t phys_addrs[XENBUS_MAX_RING_PAGES];
+ int err = GNTST_okay;
+ int i;
+ bool leaked;
*vaddr = NULL;
+ if (nr_grefs > XENBUS_MAX_RING_PAGES)
+ return -EINVAL;
+
node = kzalloc(sizeof(*node), GFP_KERNEL);
if (!node)
return -ENOMEM;
- area = alloc_vm_area(PAGE_SIZE, &pte);
+ area = alloc_vm_area(PAGE_SIZE * nr_grefs, ptes);
if (!area) {
kfree(node);
return -ENOMEM;
}
- op.host_addr = arbitrary_virt_to_machine(pte).maddr;
+ for (i = 0; i < nr_grefs; i++)
+ phys_addrs[i] = arbitrary_virt_to_machine(ptes[i]).maddr;
- gnttab_batch_map(&op, 1);
-
- if (op.status != GNTST_okay) {
- free_vm_area(area);
- kfree(node);
- xenbus_dev_fatal(dev, op.status,
- "mapping in shared page %d from domain %d",
- gnt_ref, dev->otherend_id);
- return op.status;
- }
+ err = __xenbus_map_ring(dev, gnt_refs, nr_grefs, node->handles,
+ phys_addrs,
+ GNTMAP_host_map | GNTMAP_contains_pte,
+ &leaked);
+ if (err)
+ goto failed;
- node->handle = op.handle;
- node->area = area;
+ node->nr_handles = nr_grefs;
+ node->pv.area = area;
spin_lock(&xenbus_valloc_lock);
list_add(&node->next, &xenbus_valloc_pages);
@@ -482,14 +580,33 @@ static int xenbus_map_ring_valloc_pv(struct xenbus_device *dev,
*vaddr = area->addr;
return 0;
+
+failed:
+ if (!leaked)
+ free_vm_area(area);
+ else
+ pr_alert("leaking VM area %p size %u page(s)", area, nr_grefs);
+
+ kfree(node);
+ return err;
}
static int xenbus_map_ring_valloc_hvm(struct xenbus_device *dev,
- int gnt_ref, void **vaddr)
+ grant_ref_t *gnt_ref,
+ unsigned int nr_grefs,
+ void **vaddr)
{
struct xenbus_map_node *node;
+ int i;
int err;
void *addr;
+ bool leaked = false;
+ /* Why do we need two arrays? See comment of __xenbus_map_ring */
+ phys_addr_t phys_addrs[XENBUS_MAX_RING_PAGES];
+ unsigned long addrs[XENBUS_MAX_RING_PAGES];
+
+ if (nr_grefs > XENBUS_MAX_RING_PAGES)
+ return -EINVAL;
*vaddr = NULL;
@@ -497,15 +614,32 @@ static int xenbus_map_ring_valloc_hvm(struct xenbus_device *dev,
if (!node)
return -ENOMEM;
- err = alloc_xenballooned_pages(1, &node->page, false /* lowmem */);
+ err = alloc_xenballooned_pages(nr_grefs, node->hvm.pages,
+ false /* lowmem */);
if (err)
goto out_err;
- addr = pfn_to_kaddr(page_to_pfn(node->page));
+ for (i = 0; i < nr_grefs; i++) {
+ unsigned long pfn = page_to_pfn(node->hvm.pages[i]);
+ phys_addrs[i] = (unsigned long)pfn_to_kaddr(pfn);
+ addrs[i] = (unsigned long)pfn_to_kaddr(pfn);
+ }
+
+ err = __xenbus_map_ring(dev, gnt_ref, nr_grefs, node->handles,
+ phys_addrs, GNTMAP_host_map, &leaked);
+ node->nr_handles = nr_grefs;
- err = xenbus_map_ring(dev, gnt_ref, &node->handle, addr);
if (err)
- goto out_err_free_ballooned_pages;
+ goto out_free_ballooned_pages;
+
+ addr = vmap(node->hvm.pages, nr_grefs, VM_MAP | VM_IOREMAP,
+ PAGE_KERNEL);
+ if (!addr) {
+ err = -ENOMEM;
+ goto out_xenbus_unmap_ring;
+ }
+
+ node->hvm.addr = addr;
spin_lock(&xenbus_valloc_lock);
list_add(&node->next, &xenbus_valloc_pages);
@@ -514,8 +648,16 @@ static int xenbus_map_ring_valloc_hvm(struct xenbus_device *dev,
*vaddr = addr;
return 0;
- out_err_free_ballooned_pages:
- free_xenballooned_pages(1, &node->page);
+ out_xenbus_unmap_ring:
+ if (!leaked)
+ xenbus_unmap_ring(dev, node->handles, node->nr_handles,
+ addrs);
+ else
+ pr_alert("leaking %p size %u page(s)",
+ addr, nr_grefs);
+ out_free_ballooned_pages:
+ if (!leaked)
+ free_xenballooned_pages(nr_grefs, node->hvm.pages);
out_err:
kfree(node);
return err;
@@ -525,35 +667,37 @@ static int xenbus_map_ring_valloc_hvm(struct xenbus_device *dev,
/**
* xenbus_map_ring
* @dev: xenbus device
- * @gnt_ref: grant reference
- * @handle: pointer to grant handle to be filled
- * @vaddr: address to be mapped to
+ * @gnt_refs: grant reference array
+ * @nr_grefs: number of grant reference
+ * @handles: pointer to grant handle to be filled
+ * @vaddrs: addresses to be mapped to
+ * @leaked: fail to clean up a failed map, caller should not free vaddr
*
- * Map a page of memory into this domain from another domain's grant table.
+ * Map pages of memory into this domain from another domain's grant table.
* xenbus_map_ring does not allocate the virtual address space (you must do
- * this yourself!). It only maps in the page to the specified address.
+ * this yourself!). It only maps in the pages to the specified address.
* Returns 0 on success, and GNTST_* (see xen/include/interface/grant_table.h)
- * or -ENOMEM on error. If an error is returned, device will switch to
- * XenbusStateClosing and the error message will be saved in XenStore.
+ * or -ENOMEM / -EINVAL on error. If an error is returned, device will switch to
+ * XenbusStateClosing and the first error message will be saved in XenStore.
+ * Further more if we fail to map the ring, caller should check @leaked.
+ * If @leaked is not zero it means xenbus_map_ring fails to clean up, caller
+ * should not free the address space of @vaddr.
*/
-int xenbus_map_ring(struct xenbus_device *dev, int gnt_ref,
- grant_handle_t *handle, void *vaddr)
+int xenbus_map_ring(struct xenbus_device *dev, grant_ref_t *gnt_refs,
+ unsigned int nr_grefs, grant_handle_t *handles,
+ unsigned long *vaddrs, bool *leaked)
{
- struct gnttab_map_grant_ref op;
-
- gnttab_set_map_op(&op, (unsigned long)vaddr, GNTMAP_host_map, gnt_ref,
- dev->otherend_id);
+ phys_addr_t phys_addrs[XENBUS_MAX_RING_PAGES];
+ int i;
- gnttab_batch_map(&op, 1);
+ if (nr_grefs > XENBUS_MAX_RING_PAGES)
+ return -EINVAL;
- if (op.status != GNTST_okay) {
- xenbus_dev_fatal(dev, op.status,
- "mapping in shared page %d from domain %d",
- gnt_ref, dev->otherend_id);
- } else
- *handle = op.handle;
+ for (i = 0; i < nr_grefs; i++)
+ phys_addrs[i] = (unsigned long)vaddrs[i];
- return op.status;
+ return __xenbus_map_ring(dev, gnt_refs, nr_grefs, handles,
+ phys_addrs, GNTMAP_host_map, leaked);
}
EXPORT_SYMBOL_GPL(xenbus_map_ring);
@@ -579,14 +723,15 @@ EXPORT_SYMBOL_GPL(xenbus_unmap_ring_vfree);
static int xenbus_unmap_ring_vfree_pv(struct xenbus_device *dev, void *vaddr)
{
struct xenbus_map_node *node;
- struct gnttab_unmap_grant_ref op = {
- .host_addr = (unsigned long)vaddr,
- };
+ struct gnttab_unmap_grant_ref unmap[XENBUS_MAX_RING_PAGES];
unsigned int level;
+ int i;
+ bool leaked = false;
+ int err;
spin_lock(&xenbus_valloc_lock);
list_for_each_entry(node, &xenbus_valloc_pages, next) {
- if (node->area->addr == vaddr) {
+ if (node->pv.area->addr == vaddr) {
list_del(&node->next);
goto found;
}
@@ -601,22 +746,41 @@ static int xenbus_unmap_ring_vfree_pv(struct xenbus_device *dev, void *vaddr)
return GNTST_bad_virt_addr;
}
- op.handle = node->handle;
- op.host_addr = arbitrary_virt_to_machine(
- lookup_address((unsigned long)vaddr, &level)).maddr;
+ for (i = 0; i < node->nr_handles; i++) {
+ unsigned long addr;
+
+ memset(&unmap[i], 0, sizeof(unmap[i]));
+ addr = (unsigned long)vaddr + (PAGE_SIZE * i);
+ unmap[i].host_addr = arbitrary_virt_to_machine(
+ lookup_address(addr, &level)).maddr;
+ unmap[i].dev_bus_addr = 0;
+ unmap[i].handle = node->handles[i];
+ }
- if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1))
+ if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap, i))
BUG();
- if (op.status == GNTST_okay)
- free_vm_area(node->area);
+ err = GNTST_okay;
+ leaked = false;
+ for (i = 0; i < node->nr_handles; i++) {
+ if (unmap[i].status != GNTST_okay) {
+ leaked = true;
+ xenbus_dev_error(dev, unmap[i].status,
+ "unmapping page at handle %d error %d",
+ node->handles[i], unmap[i].status);
+ err = unmap[i].status;
+ break;
+ }
+ }
+
+ if (!leaked)
+ free_vm_area(node->pv.area);
else
- xenbus_dev_error(dev, op.status,
- "unmapping page at handle %d error %d",
- node->handle, op.status);
+ pr_alert("leaking VM area %p size %u page(s)",
+ node->pv.area, node->nr_handles);
kfree(node);
- return op.status;
+ return err;
}
static int xenbus_unmap_ring_vfree_hvm(struct xenbus_device *dev, void *vaddr)
@@ -624,10 +788,12 @@ static int xenbus_unmap_ring_vfree_hvm(struct xenbus_device *dev, void *vaddr)
int rv;
struct xenbus_map_node *node;
void *addr;
+ unsigned long addrs[XENBUS_MAX_RING_PAGES];
+ int i;
spin_lock(&xenbus_valloc_lock);
list_for_each_entry(node, &xenbus_valloc_pages, next) {
- addr = pfn_to_kaddr(page_to_pfn(node->page));
+ addr = node->hvm.addr;
if (addr == vaddr) {
list_del(&node->next);
goto found;
@@ -643,12 +809,16 @@ static int xenbus_unmap_ring_vfree_hvm(struct xenbus_device *dev, void *vaddr)
return GNTST_bad_virt_addr;
}
- rv = xenbus_unmap_ring(dev, node->handle, addr);
+ for (i = 0; i < node->nr_handles; i++)
+ addrs[i] = (unsigned long)pfn_to_kaddr(page_to_pfn(node->hvm.pages[i]));
+ rv = xenbus_unmap_ring(dev, node->handles, node->nr_handles,
+ addrs);
if (!rv)
- free_xenballooned_pages(1, &node->page);
+ vunmap(vaddr);
else
- WARN(1, "Leaking %p\n", vaddr);
+ WARN(1, "Leaking %p, size %u page(s)\n", vaddr,
+ node->nr_handles);
kfree(node);
return rv;
@@ -657,29 +827,44 @@ static int xenbus_unmap_ring_vfree_hvm(struct xenbus_device *dev, void *vaddr)
/**
* xenbus_unmap_ring
* @dev: xenbus device
- * @handle: grant handle
- * @vaddr: addr to unmap
+ * @handles: grant handle array
+ * @nr_handles: number of handles in the array
+ * @vaddrs: addresses to unmap
*
- * Unmap a page of memory in this domain that was imported from another domain.
+ * Unmap memory in this domain that was imported from another domain.
* Returns 0 on success and returns GNTST_* on error
* (see xen/include/interface/grant_table.h).
*/
int xenbus_unmap_ring(struct xenbus_device *dev,
- grant_handle_t handle, void *vaddr)
+ grant_handle_t *handles, unsigned int nr_handles,
+ unsigned long *vaddrs)
{
- struct gnttab_unmap_grant_ref op;
+ struct gnttab_unmap_grant_ref unmap[XENBUS_MAX_RING_PAGES];
+ int i;
+ int err;
- gnttab_set_unmap_op(&op, (unsigned long)vaddr, GNTMAP_host_map, handle);
+ if (nr_handles > XENBUS_MAX_RING_PAGES)
+ return -EINVAL;
- if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1))
+ for (i = 0; i < nr_handles; i++)
+ gnttab_set_unmap_op(&unmap[i], vaddrs[i],
+ GNTMAP_host_map, handles[i]);
+
+ if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap, i))
BUG();
- if (op.status != GNTST_okay)
- xenbus_dev_error(dev, op.status,
- "unmapping page at handle %d error %d",
- handle, op.status);
+ err = GNTST_okay;
+ for (i = 0; i < nr_handles; i++) {
+ if (unmap[i].status != GNTST_okay) {
+ xenbus_dev_error(dev, unmap[i].status,
+ "unmapping page at handle %d error %d",
+ handles[i], unmap[i].status);
+ err = unmap[i].status;
+ break;
+ }
+ }
- return op.status;
+ return err;
}
EXPORT_SYMBOL_GPL(xenbus_unmap_ring);
diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
new file mode 100644
index 000000000000..58a5389aec89
--- /dev/null
+++ b/drivers/xen/xlate_mmu.c
@@ -0,0 +1,143 @@
+/*
+ * MMU operations common to all auto-translated physmap guests.
+ *
+ * Copyright (C) 2015 Citrix Systems R&D Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+#include <linux/kernel.h>
+#include <linux/mm.h>
+
+#include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
+
+#include <xen/xen.h>
+#include <xen/page.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/memory.h>
+
+/* map fgmfn of domid to lpfn in the current domain */
+static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
+ unsigned int domid)
+{
+ int rc;
+ struct xen_add_to_physmap_range xatp = {
+ .domid = DOMID_SELF,
+ .foreign_domid = domid,
+ .size = 1,
+ .space = XENMAPSPACE_gmfn_foreign,
+ };
+ xen_ulong_t idx = fgmfn;
+ xen_pfn_t gpfn = lpfn;
+ int err = 0;
+
+ set_xen_guest_handle(xatp.idxs, &idx);
+ set_xen_guest_handle(xatp.gpfns, &gpfn);
+ set_xen_guest_handle(xatp.errs, &err);
+
+ rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
+ return rc < 0 ? rc : err;
+}
+
+struct remap_data {
+ xen_pfn_t *fgmfn; /* foreign domain's gmfn */
+ pgprot_t prot;
+ domid_t domid;
+ struct vm_area_struct *vma;
+ int index;
+ struct page **pages;
+ struct xen_remap_mfn_info *info;
+ int *err_ptr;
+ int mapped;
+};
+
+static int remap_pte_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
+ void *data)
+{
+ struct remap_data *info = data;
+ struct page *page = info->pages[info->index++];
+ unsigned long pfn = page_to_pfn(page);
+ pte_t pte = pte_mkspecial(pfn_pte(pfn, info->prot));
+ int rc;
+
+ rc = map_foreign_page(pfn, *info->fgmfn, info->domid);
+ *info->err_ptr++ = rc;
+ if (!rc) {
+ set_pte_at(info->vma->vm_mm, addr, ptep, pte);
+ info->mapped++;
+ }
+ info->fgmfn++;
+
+ return 0;
+}
+
+int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
+ unsigned long addr,
+ xen_pfn_t *mfn, int nr,
+ int *err_ptr, pgprot_t prot,
+ unsigned domid,
+ struct page **pages)
+{
+ int err;
+ struct remap_data data;
+ unsigned long range = nr << PAGE_SHIFT;
+
+ /* Kept here for the purpose of making sure code doesn't break
+ x86 PVOPS */
+ BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
+
+ data.fgmfn = mfn;
+ data.prot = prot;
+ data.domid = domid;
+ data.vma = vma;
+ data.pages = pages;
+ data.index = 0;
+ data.err_ptr = err_ptr;
+ data.mapped = 0;
+
+ err = apply_to_page_range(vma->vm_mm, addr, range,
+ remap_pte_fn, &data);
+ return err < 0 ? err : data.mapped;
+}
+EXPORT_SYMBOL_GPL(xen_xlate_remap_gfn_array);
+
+int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
+ int nr, struct page **pages)
+{
+ int i;
+
+ for (i = 0; i < nr; i++) {
+ struct xen_remove_from_physmap xrp;
+ unsigned long pfn;
+
+ pfn = page_to_pfn(pages[i]);
+
+ xrp.domid = DOMID_SELF;
+ xrp.gpfn = pfn;
+ (void)HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrp);
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);