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Merge tag 'stable/for-linus-4.1-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

浏览代码 
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
这个提交包含在：
Linus Torvalds
2015-04-16 14:01:03 -05:00
父节点 714d8e7e27 0b97b03d88
当前提交 497a5df7bf
共修改 31 个文件，包含 1248 行新增和 696 行删除
下载 Patch 文件 下载 Diff 文件 展开所有文件 折叠所有文件

6
drivers/xen/Kconfig
查看文件

@@ -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

1
drivers/xen/Makefile
查看文件

@@ -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

27
drivers/xen/mcelog.c
查看文件

@@ -393,14 +393,25 @@ static int bind_virq_for_mce(void)
static int __init xen_late_init_mcelog(void)
{
/* 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();
}
int ret;
return -ENODEV;
/* Only DOM0 is responsible for MCE logging */
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 0;
deregister:
misc_deregister(&xen_mce_chrdev_device);
return ret;
}
device_initcall(xen_late_init_mcelog);

15
drivers/xen/pci.c
查看文件

@@ -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;

44
drivers/xen/pcpu.c
查看文件

@@ -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;
}

117
drivers/xen/privcmd.c
查看文件

@@ -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;

45
drivers/xen/xen-balloon.c
查看文件

@@ -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");

15
drivers/xen/xen-pciback/conf_space_header.c
查看文件

@@ -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;

4
drivers/xen/xen-pciback/pci_stub.c
查看文件

@@ -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);
}

2
drivers/xen/xen-pciback/xenbus.c
查看文件

@@ -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.");

96
drivers/xen/xen-scsiback.c
查看文件

@@ -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;
}

389
drivers/xen/xenbus/xenbus_client.c
查看文件

@@ -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);
static int xenbus_map_ring_valloc_pv(struct xenbus_device *dev,
int gnt_ref, void **vaddr)
/* 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,
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);
err = __xenbus_map_ring(dev, gnt_refs, nr_grefs, node->handles,
phys_addrs,
GNTMAP_host_map | GNTMAP_contains_pte,
&leaked);
if (err)
goto failed;
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;
}
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;
phys_addr_t phys_addrs[XENBUS_MAX_RING_PAGES];
int i;
gnttab_set_map_op(&op, (unsigned long)vaddr, GNTMAP_host_map, gnt_ref,
dev->otherend_id);
if (nr_grefs > XENBUS_MAX_RING_PAGES)
return -EINVAL;
gnttab_batch_map(&op, 1);
for (i = 0; i < nr_grefs; i++)
phys_addrs[i] = (unsigned long)vaddrs[i];
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;
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;
if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1))
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, 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);

143
drivers/xen/xlate_mmu.c 普通文件
查看文件

@@ -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);