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xen: fixes for 4.13-rc2 

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Merge tag 'for-linus-4.13b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:
 "Some fixes and cleanups for running under Xen"

* tag 'for-linus-4.13b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/balloon: don't online new memory initially
  xen/x86: fix cpu hotplug
  xen/grant-table: log the lack of grants
  xen/x86: Don't BUG on CPU0 offlining
This commit is contained in:
Linus Torvalds 2017-07-23 11:22:45 -07:00
parent 4b162c530d 96edd61dcf
commit a56e88ec05
6 changed files with 33 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/xen/smp_pv.c
View File

@ -19,6 +19,7 @@
#include <linux/irq_work.h>
#include <linux/tick.h>
#include <linux/nmi.h>
#include <linux/cpuhotplug.h>
#include <asm/paravirt.h>
#include <asm/desc.h>
@ -413,7 +414,7 @@ static void xen_pv_play_dead(void) /* used only with HOTPLUG_CPU */
*/
tick_nohz_idle_enter();
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
cpuhp_online_idle(CPUHP_AP_ONLINE_IDLE);
}
#else /* !CONFIG_HOTPLUG_CPU */

1
arch/x86/xen/time.c
View File

@ -309,7 +309,6 @@ static irqreturn_t xen_timer_interrupt(int irq, void *dev_id)
void xen_teardown_timer(int cpu)
{
struct clock_event_device *evt;
BUG_ON(cpu == 0);
evt = &per_cpu(xen_clock_events, cpu).evt;
if (evt->irq >= 0) {

3
drivers/xen/balloon.c
View File

@ -780,6 +780,9 @@ static int __init balloon_init(void)
}
#endif
/* Init the xen-balloon driver. */
xen_balloon_init();
return 0;
}
subsys_initcall(balloon_init);

9
drivers/xen/grant-table.c
View File

@ -42,6 +42,7 @@
#include <linux/delay.h>
#include <linux/hardirq.h>
#include <linux/workqueue.h>
#include <linux/ratelimit.h>
#include <xen/xen.h>
#include <xen/interface/xen.h>
@ -1072,8 +1073,14 @@ static int gnttab_expand(unsigned int req_entries)
cur = nr_grant_frames;
extra = ((req_entries + (grefs_per_grant_frame-1)) /
grefs_per_grant_frame);
if (cur + extra > gnttab_max_grant_frames())
if (cur + extra > gnttab_max_grant_frames()) {
pr_warn_ratelimited("xen/grant-table: max_grant_frames reached"
" cur=%u extra=%u limit=%u"
" gnttab_free_count=%u req_entries=%u\n",
cur, extra, gnttab_max_grant_frames(),
gnttab_free_count, req_entries);
return -ENOSPC;
}
rc = gnttab_map(cur, cur + extra - 1);
if (rc == 0)

22
drivers/xen/xen-balloon.c
View File

@ -59,6 +59,8 @@ static void watch_target(struct xenbus_watch *watch,
{
unsigned long long new_target;
int err;
static bool watch_fired;
static long target_diff;
err = xenbus_scanf(XBT_NIL, "memory", "target", "%llu", &new_target);
if (err != 1) {
@ -69,7 +71,14 @@ static void watch_target(struct xenbus_watch *watch,
/* The given memory/target value is in KiB, so it needs converting to
* pages. PAGE_SHIFT converts bytes to pages, hence PAGE_SHIFT - 10.
*/
balloon_set_new_target(new_target >> (PAGE_SHIFT - 10));
new_target >>= PAGE_SHIFT - 10;
if (watch_fired) {
balloon_set_new_target(new_target - target_diff);
return;
}
watch_fired = true;
target_diff = new_target - balloon_stats.target_pages;
}
static struct xenbus_watch target_watch = {
.node = "memory/target",
@ -94,22 +103,15 @@ static struct notifier_block xenstore_notifier = {
.notifier_call = balloon_init_watcher,
};
static int __init balloon_init(void)
void xen_balloon_init(void)
{
if (!xen_domain())
return -ENODEV;
pr_info("Initialising balloon driver\n");
register_balloon(&balloon_dev);
register_xen_selfballooning(&balloon_dev);
register_xenstore_notifier(&xenstore_notifier);
return 0;
}
subsys_initcall(balloon_init);
EXPORT_SYMBOL_GPL(xen_balloon_init);
#define BALLOON_SHOW(name, format, args...) \
static ssize_t show_##name(struct device *dev, \

8
include/xen/balloon.h
View File

@ -35,3 +35,11 @@ static inline int register_xen_selfballooning(struct device *dev)
return -ENOSYS;
}
#endif
#ifdef CONFIG_XEN_BALLOON
void xen_balloon_init(void);
#else
static inline void xen_balloon_init(void)
{
}
#endif