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xen: regression and bug fixes for 4.6-rc2

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- Safely migrate event channels between CPUs.
 - Fix CPU hotplug.
 - Maintainer changes.
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Merge tag 'for-linus-4.6-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen fixes from David Vrabel:
 "Regression and bug fixes for 4.6-rc2:

   - safely migrate event channels between CPUs
   - fix CPU hotplug
   - maintainer changes"

* tag 'for-linus-4.6-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  MAINTAINERS: xen: Konrad to step down and Juergen to pick up
  xen/events: Mask a moving irq
  Xen on ARM and ARM64: update MAINTAINERS info
  xen/x86: Call cpu_startup_entry(CPUHP_AP_ONLINE_IDLE) from xen_play_dead()
  xen/apic: Provide Xen-specific version of cpu_present_to_apicid APIC op
This commit is contained in:
Linus Torvalds 2016-04-04 16:38:36 -07:00
commit 93e2aeaca5
4 changed files with 41 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
MAINTAINERS
View File

@ -12205,9 +12205,9 @@ S: Maintained
F: drivers/media/tuners/tuner-xc2028.*
XEN HYPERVISOR INTERFACE
M: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
M: Boris Ostrovsky <boris.ostrovsky@oracle.com>
M: David Vrabel <david.vrabel@citrix.com>
M: Juergen Gross <jgross@suse.com>
L: xen-devel@lists.xenproject.org (moderated for non-subscribers)
T: git git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git
S: Supported
@ -12219,16 +12219,16 @@ F: include/xen/
F: include/uapi/xen/
XEN HYPERVISOR ARM
M: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
M: Stefano Stabellini <sstabellini@kernel.org>
L: xen-devel@lists.xenproject.org (moderated for non-subscribers)
S: Supported
S: Maintained
F: arch/arm/xen/
F: arch/arm/include/asm/xen/
XEN HYPERVISOR ARM64
M: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
M: Stefano Stabellini <sstabellini@kernel.org>
L: xen-devel@lists.xenproject.org (moderated for non-subscribers)
S: Supported
S: Maintained
F: arch/arm64/xen/
F: arch/arm64/include/asm/xen/

12
arch/x86/xen/apic.c
View File

@ -66,7 +66,7 @@ static u32 xen_apic_read(u32 reg)
ret = HYPERVISOR_platform_op(&op);
if (ret)
return 0;
op.u.pcpu_info.apic_id = BAD_APICID;
return op.u.pcpu_info.apic_id << 24;
}
@ -142,6 +142,14 @@ static void xen_silent_inquire(int apicid)
{
}
static int xen_cpu_present_to_apicid(int cpu)
{
if (cpu_present(cpu))
return xen_get_apic_id(xen_apic_read(APIC_ID));
else
return BAD_APICID;
}
static struct apic xen_pv_apic = {
.name = "Xen PV",
.probe = xen_apic_probe_pv,
@ -162,7 +170,7 @@ static struct apic xen_pv_apic = {
.ioapic_phys_id_map = default_ioapic_phys_id_map, /* Used on 32-bit */
.setup_apic_routing = NULL,
.cpu_present_to_apicid = default_cpu_present_to_apicid,
.cpu_present_to_apicid = xen_cpu_present_to_apicid,
.apicid_to_cpu_present = physid_set_mask_of_physid, /* Used on 32-bit */
.check_phys_apicid_present = default_check_phys_apicid_present, /* smp_sanity_check needs it */
.phys_pkg_id = xen_phys_pkg_id, /* detect_ht */

2
arch/x86/xen/smp.c
View File

@ -545,6 +545,8 @@ static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
* data back is to call:
*/
tick_nohz_idle_enter();
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
#else /* !CONFIG_HOTPLUG_CPU */

28
drivers/xen/events/events_base.c
View File

@ -484,9 +484,19 @@ static void eoi_pirq(struct irq_data *data)
struct physdev_eoi eoi = { .irq = pirq_from_irq(data->irq) };
int rc = 0;
irq_move_irq(data);
if (!VALID_EVTCHN(evtchn))
return;
if (VALID_EVTCHN(evtchn))
if (unlikely(irqd_is_setaffinity_pending(data))) {
int masked = test_and_set_mask(evtchn);
clear_evtchn(evtchn);
irq_move_masked_irq(data);
if (!masked)
unmask_evtchn(evtchn);
} else
clear_evtchn(evtchn);
if (pirq_needs_eoi(data->irq)) {
@ -1357,9 +1367,19 @@ static void ack_dynirq(struct irq_data *data)
{
int evtchn = evtchn_from_irq(data->irq);
irq_move_irq(data);
if (!VALID_EVTCHN(evtchn))
return;
if (VALID_EVTCHN(evtchn))
if (unlikely(irqd_is_setaffinity_pending(data))) {
int masked = test_and_set_mask(evtchn);
clear_evtchn(evtchn);
irq_move_masked_irq(data);
if (!masked)
unmask_evtchn(evtchn);
} else
clear_evtchn(evtchn);
}