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Subject[PATCH 2/2] kvm: use cpumask_var_t for cpus_hardware_enabled
This changes cpus_hardware_enabled from a cpumask_t to a cpumask_var_t:
equivalent for CONFIG_CPUMASKS_OFFSTACK=n, otherwise dynamically allocated.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
virt/kvm/kvm_main.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -63,7 +63,7 @@ DEFINE_SPINLOCK(kvm_lock);
DEFINE_SPINLOCK(kvm_lock);
LIST_HEAD(vm_list);

-static cpumask_t cpus_hardware_enabled;
+static cpumask_var_t cpus_hardware_enabled;

struct kmem_cache *kvm_vcpu_cache;
EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
@@ -1796,9 +1796,9 @@ static void hardware_enable(void *junk)
{
int cpu = raw_smp_processor_id();

- if (cpu_isset(cpu, cpus_hardware_enabled))
+ if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
return;
- cpu_set(cpu, cpus_hardware_enabled);
+ cpumask_set_cpu(cpu, cpus_hardware_enabled);
kvm_arch_hardware_enable(NULL);
}

@@ -1806,9 +1806,9 @@ static void hardware_disable(void *junk)
{
int cpu = raw_smp_processor_id();

- if (!cpu_isset(cpu, cpus_hardware_enabled))
+ if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
return;
- cpu_clear(cpu, cpus_hardware_enabled);
+ cpumask_clear_cpu(cpu, cpus_hardware_enabled);
kvm_arch_hardware_disable(NULL);
}

@@ -2042,9 +2042,14 @@ int kvm_init(void *opaque, unsigned int

bad_pfn = page_to_pfn(bad_page);

+ if (!alloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
+ r = -ENOMEM;
+ goto out_free_0;
+ }
+
r = kvm_arch_hardware_setup();
if (r < 0)
- goto out_free_0;
+ goto out_free_0a;

for_each_online_cpu(cpu) {
smp_call_function_single(cpu,
@@ -2103,6 +2108,8 @@ out_free_2:
on_each_cpu(hardware_disable, NULL, 1);
out_free_1:
kvm_arch_hardware_unsetup();
+out_free_0a:
+ free_cpumask_var(cpus_hardware_enabled);
out_free_0:
__free_page(bad_page);
out:
@@ -2126,6 +2133,7 @@ void kvm_exit(void)
kvm_arch_hardware_unsetup();
kvm_arch_exit();
kvm_exit_debug();
+ free_cpumask_var(cpus_hardware_enabled);
__free_page(bad_page);
}
EXPORT_SYMBOL_GPL(kvm_exit);


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