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xen: branch for v5.15-rc1 

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Merge tag 'for-linus-5.15-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen updates from Juergen Gross:

 - some small cleanups

 - a fix for a bug when running as Xen PV guest which could result in
   not all memory being transferred in case of a migration of the guest

 - a small series for getting rid of code for supporting very old Xen
   hypervisor versions nobody should be using since many years now

 - a series for hardening the Xen block frontend driver

 - a fix for Xen PV boot code issuing warning messages due to a stray
   preempt_disable() on the non-boot processors

* tag 'for-linus-5.15-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: remove stray preempt_disable() from PV AP startup code
  xen/pcifront: Removed unnecessary __ref annotation
  x86: xen: platform-pci-unplug: use pr_err() and pr_warn() instead of raw printk()
  drivers/xen/xenbus/xenbus_client.c: fix bugon.cocci warnings
  xen/blkfront: don't trust the backend response data blindly
  xen/blkfront: don't take local copy of a request from the ring page
  xen/blkfront: read response from backend only once
  xen: assume XENFEAT_gnttab_map_avail_bits being set for pv guests
  xen: assume XENFEAT_mmu_pt_update_preserve_ad being set for pv guests
  xen: check required Xen features
  xen: fix setting of max_pfn in shared_info
This commit is contained in:
Linus Torvalds 2021-09-02 13:20:11 -07:00
Родитель a2d616b935 58e636039b
Коммит 9ae5fceb9a
10 изменённых файлов: 141 добавлений и 115 удалений
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12
arch/x86/xen/enlighten_pv.c
Просмотреть файл

@ -116,9 +116,8 @@ static void __init xen_banner(void)
HYPERVISOR_xen_version(XENVER_extraversion, &extra);
pr_info("Booting paravirtualized kernel on %s\n", pv_info.name);
printk(KERN_INFO "Xen version: %d.%d%s%s\n",
version >> 16, version & 0xffff, extra.extraversion,
xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
pr_info("Xen version: %d.%d%s (preserve-AD)\n",
version >> 16, version & 0xffff, extra.extraversion);
}
static void __init xen_pv_init_platform(void)
@ -1302,13 +1301,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
xen_init_apic();
#endif
if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
pv_ops.mmu.ptep_modify_prot_start =
xen_ptep_modify_prot_start;
pv_ops.mmu.ptep_modify_prot_commit =
xen_ptep_modify_prot_commit;
}
machine_ops = xen_machine_ops;
/*

4
arch/x86/xen/mmu_pv.c
Просмотреть файл

@ -2099,8 +2099,8 @@ static const struct pv_mmu_ops xen_mmu_ops __initconst = {
.set_pte = xen_set_pte_init,
.set_pmd = xen_set_pmd_hyper,
.ptep_modify_prot_start = __ptep_modify_prot_start,
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
.ptep_modify_prot_start = xen_ptep_modify_prot_start,
.ptep_modify_prot_commit = xen_ptep_modify_prot_commit,
.pte_val = PV_CALLEE_SAVE(xen_pte_val),
.pgd_val = PV_CALLEE_SAVE(xen_pgd_val),

4
arch/x86/xen/p2m.c
Просмотреть файл

@ -618,8 +618,8 @@ int xen_alloc_p2m_entry(unsigned long pfn)
}
/* Expanded the p2m? */
if (pfn > xen_p2m_last_pfn) {
xen_p2m_last_pfn = pfn;
if (pfn >= xen_p2m_last_pfn) {
xen_p2m_last_pfn = ALIGN(pfn + 1, P2M_PER_PAGE);
HYPERVISOR_shared_info->arch.max_pfn = xen_p2m_last_pfn;
}

16
arch/x86/xen/platform-pci-unplug.c
Просмотреть файл

@ -7,6 +7,8 @@
* Copyright (c) 2010, Citrix
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/io.h>
#include <linux/export.h>
@ -30,13 +32,13 @@ static int check_platform_magic(void)
magic = inw(XEN_IOPORT_MAGIC);
if (magic != XEN_IOPORT_MAGIC_VAL) {
printk(KERN_ERR "Xen Platform PCI: unrecognised magic value\n");
pr_err("Xen Platform PCI: unrecognised magic value\n");
return XEN_PLATFORM_ERR_MAGIC;
}
protocol = inb(XEN_IOPORT_PROTOVER);
printk(KERN_DEBUG "Xen Platform PCI: I/O protocol version %d\n",
pr_debug("Xen Platform PCI: I/O protocol version %d\n",
protocol);
switch (protocol) {
@ -44,12 +46,12 @@ static int check_platform_magic(void)
outw(XEN_IOPORT_LINUX_PRODNUM, XEN_IOPORT_PRODNUM);
outl(XEN_IOPORT_LINUX_DRVVER, XEN_IOPORT_DRVVER);
if (inw(XEN_IOPORT_MAGIC) != XEN_IOPORT_MAGIC_VAL) {
printk(KERN_ERR "Xen Platform: blacklisted by host\n");
pr_err("Xen Platform: blacklisted by host\n");
return XEN_PLATFORM_ERR_BLACKLIST;
}
break;
default:
printk(KERN_WARNING "Xen Platform PCI: unknown I/O protocol version\n");
pr_warn("Xen Platform PCI: unknown I/O protocol version\n");
return XEN_PLATFORM_ERR_PROTOCOL;
}
@ -155,12 +157,12 @@ void xen_unplug_emulated_devices(void)
* been compiled for this kernel (modules or built-in are both OK). */
if (!xen_emul_unplug) {
if (xen_must_unplug_nics()) {
printk(KERN_INFO "Netfront and the Xen platform PCI driver have "
pr_info("Netfront and the Xen platform PCI driver have "
"been compiled for this kernel: unplug emulated NICs.\n");
xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
}
if (xen_must_unplug_disks()) {
printk(KERN_INFO "Blkfront and the Xen platform PCI driver have "
pr_info("Blkfront and the Xen platform PCI driver have "
"been compiled for this kernel: unplug emulated disks.\n"
"You might have to change the root device\n"
"from /dev/hd[a-d] to /dev/xvd[a-d]\n"
@ -200,7 +202,7 @@ static int __init parse_xen_emul_unplug(char *arg)
else if (!strncmp(p, "never", l))
xen_emul_unplug |= XEN_UNPLUG_NEVER;
else
printk(KERN_WARNING "unrecognised option '%s' "
pr_warn("unrecognised option '%s' "
"in parameter 'xen_emul_unplug'\n", p);
}
return 0;

1
arch/x86/xen/smp_pv.c
Просмотреть файл

@ -64,7 +64,6 @@ static void cpu_bringup(void)
cr4_init();
cpu_init();
touch_softlockup_watchdog();
preempt_disable();
/* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {

126
drivers/block/xen-blkfront.c
Просмотреть файл

@ -80,6 +80,7 @@ enum blkif_state {
BLKIF_STATE_DISCONNECTED,
BLKIF_STATE_CONNECTED,
BLKIF_STATE_SUSPENDED,
BLKIF_STATE_ERROR,
};
struct grant {
@ -89,6 +90,7 @@ struct grant {
};
enum blk_req_status {
REQ_PROCESSING,
REQ_WAITING,
REQ_DONE,
REQ_ERROR,
@ -530,10 +532,10 @@ static unsigned long blkif_ring_get_request(struct blkfront_ring_info *rinfo,
id = get_id_from_freelist(rinfo);
rinfo->shadow[id].request = req;
rinfo->shadow[id].status = REQ_WAITING;
rinfo->shadow[id].status = REQ_PROCESSING;
rinfo->shadow[id].associated_id = NO_ASSOCIATED_ID;
(*ring_req)->u.rw.id = id;
rinfo->shadow[id].req.u.rw.id = id;
return id;
}
@ -541,11 +543,12 @@ static unsigned long blkif_ring_get_request(struct blkfront_ring_info *rinfo,
static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_info *rinfo)
{
struct blkfront_info *info = rinfo->dev_info;
struct blkif_request *ring_req;
struct blkif_request *ring_req, *final_ring_req;
unsigned long id;
/* Fill out a communications ring structure. */
id = blkif_ring_get_request(rinfo, req, &ring_req);
id = blkif_ring_get_request(rinfo, req, &final_ring_req);
ring_req = &rinfo->shadow[id].req;
ring_req->operation = BLKIF_OP_DISCARD;
ring_req->u.discard.nr_sectors = blk_rq_sectors(req);
@ -556,8 +559,9 @@ static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_inf
else
ring_req->u.discard.flag = 0;
/* Keep a private copy so we can reissue requests when recovering. */
rinfo->shadow[id].req = *ring_req;
/* Copy the request to the ring page. */
*final_ring_req = *ring_req;
rinfo->shadow[id].status = REQ_WAITING;
return 0;
}
@ -690,6 +694,7 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri
{
struct blkfront_info *info = rinfo->dev_info;
struct blkif_request *ring_req, *extra_ring_req = NULL;
struct blkif_request *final_ring_req, *final_extra_ring_req = NULL;
unsigned long id, extra_id = NO_ASSOCIATED_ID;
bool require_extra_req = false;
int i;
@ -734,7 +739,8 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri
}
/* Fill out a communications ring structure. */
id = blkif_ring_get_request(rinfo, req, &ring_req);
id = blkif_ring_get_request(rinfo, req, &final_ring_req);
ring_req = &rinfo->shadow[id].req;
num_sg = blk_rq_map_sg(req->q, req, rinfo->shadow[id].sg);
num_grant = 0;
@ -785,7 +791,9 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri
ring_req->u.rw.nr_segments = num_grant;
if (unlikely(require_extra_req)) {
extra_id = blkif_ring_get_request(rinfo, req,
&extra_ring_req);
&final_extra_ring_req);
extra_ring_req = &rinfo->shadow[extra_id].req;
/*
* Only the first request contains the scatter-gather
* list.
@ -827,10 +835,13 @@ static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *ri
if (setup.segments)
kunmap_atomic(setup.segments);
/* Keep a private copy so we can reissue requests when recovering. */
rinfo->shadow[id].req = *ring_req;
if (unlikely(require_extra_req))
rinfo->shadow[extra_id].req = *extra_ring_req;
/* Copy request(s) to the ring page. */
*final_ring_req = *ring_req;
rinfo->shadow[id].status = REQ_WAITING;
if (unlikely(require_extra_req)) {
*final_extra_ring_req = *extra_ring_req;
rinfo->shadow[extra_id].status = REQ_WAITING;
}
if (new_persistent_gnts)
gnttab_free_grant_references(setup.gref_head);
@ -1353,8 +1364,8 @@ static enum blk_req_status blkif_rsp_to_req_status(int rsp)
static int blkif_get_final_status(enum blk_req_status s1,
enum blk_req_status s2)
{
BUG_ON(s1 == REQ_WAITING);
BUG_ON(s2 == REQ_WAITING);
BUG_ON(s1 < REQ_DONE);
BUG_ON(s2 < REQ_DONE);
if (s1 == REQ_ERROR || s2 == REQ_ERROR)
return BLKIF_RSP_ERROR;
@ -1387,7 +1398,7 @@ static bool blkif_completion(unsigned long *id,
s->status = blkif_rsp_to_req_status(bret->status);
/* Wait the second response if not yet here. */
if (s2->status == REQ_WAITING)
if (s2->status < REQ_DONE)
return false;
bret->status = blkif_get_final_status(s->status,
@ -1495,7 +1506,7 @@ static bool blkif_completion(unsigned long *id,
static irqreturn_t blkif_interrupt(int irq, void *dev_id)
{
struct request *req;
struct blkif_response *bret;
struct blkif_response bret;
RING_IDX i, rp;
unsigned long flags;
struct blkfront_ring_info *rinfo = (struct blkfront_ring_info *)dev_id;
@ -1506,54 +1517,76 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
spin_lock_irqsave(&rinfo->ring_lock, flags);
again:
rp = rinfo->ring.sring->rsp_prod;
rmb(); /* Ensure we see queued responses up to 'rp'. */
rp = READ_ONCE(rinfo->ring.sring->rsp_prod);
virt_rmb(); /* Ensure we see queued responses up to 'rp'. */
if (RING_RESPONSE_PROD_OVERFLOW(&rinfo->ring, rp)) {
pr_alert("%s: illegal number of responses %u\n",
info->gd->disk_name, rp - rinfo->ring.rsp_cons);
goto err;
}
for (i = rinfo->ring.rsp_cons; i != rp; i++) {
unsigned long id;
unsigned int op;
RING_COPY_RESPONSE(&rinfo->ring, i, &bret);
id = bret.id;
bret = RING_GET_RESPONSE(&rinfo->ring, i);
id = bret->id;
/*
* The backend has messed up and given us an id that we would
* never have given to it (we stamp it up to BLK_RING_SIZE -
* look in get_id_from_freelist.
*/
if (id >= BLK_RING_SIZE(info)) {
WARN(1, "%s: response to %s has incorrect id (%ld)\n",
info->gd->disk_name, op_name(bret->operation), id);
/* We can't safely get the 'struct request' as
* the id is busted. */
continue;
pr_alert("%s: response has incorrect id (%ld)\n",
info->gd->disk_name, id);
goto err;
}
if (rinfo->shadow[id].status != REQ_WAITING) {
pr_alert("%s: response references no pending request\n",
info->gd->disk_name);
goto err;
}
rinfo->shadow[id].status = REQ_PROCESSING;
req = rinfo->shadow[id].request;
if (bret->operation != BLKIF_OP_DISCARD) {
op = rinfo->shadow[id].req.operation;
if (op == BLKIF_OP_INDIRECT)
op = rinfo->shadow[id].req.u.indirect.indirect_op;
if (bret.operation != op) {
pr_alert("%s: response has wrong operation (%u instead of %u)\n",
info->gd->disk_name, bret.operation, op);
goto err;
}
if (bret.operation != BLKIF_OP_DISCARD) {
/*
* We may need to wait for an extra response if the
* I/O request is split in 2
*/
if (!blkif_completion(&id, rinfo, bret))
if (!blkif_completion(&id, rinfo, &bret))
continue;
}
if (add_id_to_freelist(rinfo, id)) {
WARN(1, "%s: response to %s (id %ld) couldn't be recycled!\n",
info->gd->disk_name, op_name(bret->operation), id);
info->gd->disk_name, op_name(bret.operation), id);
continue;
}
if (bret->status == BLKIF_RSP_OKAY)
if (bret.status == BLKIF_RSP_OKAY)
blkif_req(req)->error = BLK_STS_OK;
else
blkif_req(req)->error = BLK_STS_IOERR;
switch (bret->operation) {
switch (bret.operation) {
case BLKIF_OP_DISCARD:
if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
if (unlikely(bret.status == BLKIF_RSP_EOPNOTSUPP)) {
struct request_queue *rq = info->rq;
printk(KERN_WARNING "blkfront: %s: %s op failed\n",
info->gd->disk_name, op_name(bret->operation));
pr_warn_ratelimited("blkfront: %s: %s op failed\n",
info->gd->disk_name, op_name(bret.operation));
blkif_req(req)->error = BLK_STS_NOTSUPP;
info->feature_discard = 0;
info->feature_secdiscard = 0;
@ -1563,15 +1596,15 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
break;
case BLKIF_OP_FLUSH_DISKCACHE:
case BLKIF_OP_WRITE_BARRIER:
if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
printk(KERN_WARNING "blkfront: %s: %s op failed\n",
info->gd->disk_name, op_name(bret->operation));
if (unlikely(bret.status == BLKIF_RSP_EOPNOTSUPP)) {
pr_warn_ratelimited("blkfront: %s: %s op failed\n",
info->gd->disk_name, op_name(bret.operation));
blkif_req(req)->error = BLK_STS_NOTSUPP;
}
if (unlikely(bret->status == BLKIF_RSP_ERROR &&
if (unlikely(bret.status == BLKIF_RSP_ERROR &&
rinfo->shadow[id].req.u.rw.nr_segments == 0)) {
printk(KERN_WARNING "blkfront: %s: empty %s op failed\n",
info->gd->disk_name, op_name(bret->operation));
pr_warn_ratelimited("blkfront: %s: empty %s op failed\n",
info->gd->disk_name, op_name(bret.operation));
blkif_req(req)->error = BLK_STS_NOTSUPP;
}
if (unlikely(blkif_req(req)->error)) {
@ -1584,9 +1617,10 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
fallthrough;
case BLKIF_OP_READ:
case BLKIF_OP_WRITE:
if (unlikely(bret->status != BLKIF_RSP_OKAY))
dev_dbg(&info->xbdev->dev, "Bad return from blkdev data "
"request: %x\n", bret->status);
if (unlikely(bret.status != BLKIF_RSP_OKAY))
dev_dbg_ratelimited(&info->xbdev->dev,
"Bad return from blkdev data request: %#x\n",
bret.status);
break;
default:
@ -1612,6 +1646,14 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
spin_unlock_irqrestore(&rinfo->ring_lock, flags);
return IRQ_HANDLED;
err:
info->connected = BLKIF_STATE_ERROR;
spin_unlock_irqrestore(&rinfo->ring_lock, flags);
pr_alert("%s disabled for further use\n", info->gd->disk_name);
return IRQ_HANDLED;
}

22
drivers/pci/xen-pcifront.c
Просмотреть файл

@ -115,7 +115,7 @@ static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op)
struct xen_pci_op *active_op = &pdev->sh_info->op;
unsigned long irq_flags;
evtchn_port_t port = pdev->evtchn;
unsigned irq = pdev->irq;
unsigned int irq = pdev->irq;
s64 ns, ns_timeout;
spin_lock_irqsave(&pdev->sh_info_lock, irq_flags);
@ -414,7 +414,8 @@ static int pcifront_scan_bus(struct pcifront_device *pdev,
struct pci_dev *d;
unsigned int devfn;
/* Scan the bus for functions and add.
/*
* Scan the bus for functions and add.
* We omit handling of PCI bridge attachment because pciback prevents
* bridges from being exported.
*/
@ -492,8 +493,10 @@ static int pcifront_scan_root(struct pcifront_device *pdev,
list_add(&bus_entry->list, &pdev->root_buses);
/* pci_scan_root_bus skips devices which do not have a
* devfn==0. The pcifront_scan_bus enumerates all devfn. */
/*
* pci_scan_root_bus skips devices which do not have a
* devfn==0. The pcifront_scan_bus enumerates all devfn.
*/
err = pcifront_scan_bus(pdev, domain, bus, b);
/* Claim resources before going "live" with our devices */
@ -651,8 +654,10 @@ static void pcifront_do_aer(struct work_struct *data)
pci_channel_state_t state =
(pci_channel_state_t)pdev->sh_info->aer_op.err;
/*If a pci_conf op is in progress,
we have to wait until it is done before service aer op*/
/*
* If a pci_conf op is in progress, we have to wait until it is done
* before service aer op
*/
dev_dbg(&pdev->xdev->dev,
"pcifront service aer bus %x devfn %x\n",
pdev->sh_info->aer_op.bus, pdev->sh_info->aer_op.devfn);
@ -676,6 +681,7 @@ static void pcifront_do_aer(struct work_struct *data)
static irqreturn_t pcifront_handler_aer(int irq, void *dev)
{
struct pcifront_device *pdev = dev;
schedule_pcifront_aer_op(pdev);
return IRQ_HANDLED;
}
@ -1027,6 +1033,7 @@ static int pcifront_detach_devices(struct pcifront_device *pdev)
/* Find devices being detached and remove them. */
for (i = 0; i < num_devs; i++) {
int l, state;
l = snprintf(str, sizeof(str), "state-%d", i);
if (unlikely(l >= (sizeof(str) - 1))) {
err = -ENOMEM;
@ -1078,7 +1085,7 @@ out:
return err;
}
static void __ref pcifront_backend_changed(struct xenbus_device *xdev,
static void pcifront_backend_changed(struct xenbus_device *xdev,
enum xenbus_state be_state)
{
struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
@ -1137,6 +1144,7 @@ out:
static int pcifront_xenbus_remove(struct xenbus_device *xdev)
{
struct pcifront_device *pdev = dev_get_drvdata(&xdev->dev);
if (pdev)
free_pdev(pdev);

18
drivers/xen/features.c
Просмотреть файл

@ -9,13 +9,26 @@
#include <linux/types.h>
#include <linux/cache.h>
#include <linux/export.h>
#include <linux/printk.h>
#include <asm/xen/hypercall.h>
#include <xen/xen.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>
#include <xen/features.h>
/*
* Linux kernel expects at least Xen 4.0.
*
* Assume some features to be available for that reason (depending on guest
* mode, of course).
*/
#define chk_required_feature(f) { \
if (!xen_feature(f)) \
panic("Xen: feature %s not available!\n", #f); \
}
u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
EXPORT_SYMBOL_GPL(xen_features);
@ -31,4 +44,9 @@ void xen_setup_features(void)
for (j = 0; j < 32; j++)
xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
}
if (xen_pv_domain()) {
chk_required_feature(XENFEAT_mmu_pt_update_preserve_ad);
chk_required_feature(XENFEAT_gnttab_map_avail_bits);
}
}

36
drivers/xen/gntdev.c
Просмотреть файл

@ -266,20 +266,13 @@ static int find_grant_ptes(pte_t *pte, unsigned long addr, void *data)
{
struct gntdev_grant_map *map = data;
unsigned int pgnr = (addr - map->vma->vm_start) >> PAGE_SHIFT;
int flags = map->flags | GNTMAP_application_map | GNTMAP_contains_pte;
int flags = map->flags | GNTMAP_application_map | GNTMAP_contains_pte |
(1 << _GNTMAP_guest_avail0);
u64 pte_maddr;
BUG_ON(pgnr >= map->count);
pte_maddr = arbitrary_virt_to_machine(pte).maddr;
/*
* Set the PTE as special to force get_user_pages_fast() fall
* back to the slow path. If this is not supported as part of
* the grant map, it will be done afterwards.
*/
if (xen_feature(XENFEAT_gnttab_map_avail_bits))
flags |= (1 << _GNTMAP_guest_avail0);
gnttab_set_map_op(&map->map_ops[pgnr], pte_maddr, flags,
map->grants[pgnr].ref,
map->grants[pgnr].domid);
@ -288,14 +281,6 @@ static int find_grant_ptes(pte_t *pte, unsigned long addr, void *data)
return 0;
}
#ifdef CONFIG_X86
static int set_grant_ptes_as_special(pte_t *pte, unsigned long addr, void *data)
{
set_pte_at(current->mm, addr, pte, pte_mkspecial(*pte));
return 0;
}
#endif
int gntdev_map_grant_pages(struct gntdev_grant_map *map)
{
int i, err = 0;
@ -1055,23 +1040,6 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
err = vm_map_pages_zero(vma, map->pages, map->count);
if (err)
goto out_put_map;
} else {
#ifdef CONFIG_X86
/*
* If the PTEs were not made special by the grant map
* hypercall, do so here.
*
* This is racy since the mapping is already visible
* to userspace but userspace should be well-behaved
* enough to not touch it until the mmap() call
* returns.
*/
if (!xen_feature(XENFEAT_gnttab_map_avail_bits)) {
apply_to_page_range(vma->vm_mm, vma->vm_start,
vma->vm_end - vma->vm_start,
set_grant_ptes_as_special, NULL);
}
#endif
}
return 0;

9
drivers/xen/xenbus/xenbus_client.c
Просмотреть файл

@ -542,8 +542,7 @@ static int __xenbus_map_ring(struct xenbus_device *dev,
}
}
if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, info->unmap, j))
BUG();
BUG_ON(HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, info->unmap, j));
*leaked = false;
for (i = 0; i < j; i++) {
@ -581,8 +580,7 @@ static int xenbus_unmap_ring(struct xenbus_device *dev, grant_handle_t *handles,
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();
BUG_ON(HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap, i));
err = GNTST_okay;
for (i = 0; i < nr_handles; i++) {
@ -778,8 +776,7 @@ static int xenbus_unmap_ring_pv(struct xenbus_device *dev, void *vaddr)
unmap[i].handle = node->handles[i];
}
if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap, i))
BUG();
BUG_ON(HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap, i));
err = GNTST_okay;
leaked = false;