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xen/arm: SMP support

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Map vcpu_info using VCPUOP_register_vcpu_info on all the online vcpus,
make sure the allocated struct doesn't cross a page boundary.

Call enable_percpu_irq on every cpu.

Changes in v5:
- allocate xen_vcpu_info dynamically, aligning it to the size of the
struct;
- use VCPUOP_register_vcpu_info on cpu0 too.

Changed in v2:
- move the percpu variable argument fix to a separate patch;
- remove unused variable.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Stefano Stabellini 2013-04-25 16:17:04 +00:00
parent ea0af61321
commit 9a9ab3cc00
1 changed files with 42 additions and 6 deletions
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48
arch/arm/xen/enlighten.c
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@ -2,6 +2,7 @@
#include <xen/events.h>
#include <xen/grant_table.h>
#include <xen/hvm.h>
#include <xen/interface/vcpu.h>
#include <xen/interface/xen.h>
#include <xen/interface/memory.h>
#include <xen/interface/hvm/params.h>
@ -32,6 +33,7 @@ struct shared_info xen_dummy_shared_info;
struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
static struct vcpu_info __percpu *xen_vcpu_info;
/* These are unused until we support booting "pre-ballooned" */
unsigned long xen_released_pages;
@ -148,6 +150,29 @@ int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
}
EXPORT_SYMBOL_GPL(xen_unmap_domain_mfn_range);
static int __init xen_secondary_init(unsigned int cpu)
{
struct vcpu_register_vcpu_info info;
struct vcpu_info *vcpup;
int err;
pr_info("Xen: initializing cpu%d\n", cpu);
vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
info.mfn = __pa(vcpup) >> PAGE_SHIFT;
info.offset = offset_in_page(vcpup);
err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
if (err) {
pr_debug("register_vcpu_info failed: err=%d\n", err);
} else {
/* This cpu is using the registered vcpu info, even if
later ones fail to. */
per_cpu(xen_vcpu, cpu) = vcpup;
}
return 0;
}
/*
* see Documentation/devicetree/bindings/arm/xen.txt for the
* documentation of the Xen Device Tree format.
@ -163,6 +188,7 @@ static int __init xen_guest_init(void)
const char *version = NULL;
const char *xen_prefix = "xen,xen-";
struct resource res;
int i;
node = of_find_compatible_node(NULL, NULL, "xen,xen");
if (!node) {
@ -209,13 +235,18 @@ static int __init xen_guest_init(void)
/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
* page, we use it in the event channel upcall and in some pvclock
* related functions. We don't need the vcpu_info placement
* optimizations because we don't use any pv_mmu or pv_irq op on
* HVM.
* related functions.
* The shared info contains exactly 1 CPU (the boot CPU). The guest
* is required to use VCPUOP_register_vcpu_info to place vcpu info
* for secondary CPUs as they are brought up. */
per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
* for secondary CPUs as they are brought up.
* For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
*/
xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
sizeof(struct vcpu_info));
if (xen_vcpu_info == NULL)
return -ENOMEM;
for_each_online_cpu(i)
xen_secondary_init(i);
gnttab_init();
if (!xen_initial_domain())
@ -231,6 +262,11 @@ static irqreturn_t xen_arm_callback(int irq, void *arg)
return IRQ_HANDLED;
}
static __init void xen_percpu_enable_events(void *unused)
{
enable_percpu_irq(xen_events_irq, 0);
}
static int __init xen_init_events(void)
{
if (!xen_domain() || xen_events_irq < 0)
@ -244,7 +280,7 @@ static int __init xen_init_events(void)
return -EINVAL;
}
enable_percpu_irq(xen_events_irq, 0);
on_each_cpu(xen_percpu_enable_events, NULL, 0);
return 0;
}