From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
cpus_hardware_enabled mask seems incomplete protection against other kernel
component using CPU virtualization feature. Because it's obscure and
incomplete, remove the check.
Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
virt/kvm/kvm_arch.c | 15 +--------------
1 file changed, 1 insertion(+), 14 deletions(-)
diff --git a/virt/kvm/kvm_arch.c b/virt/kvm/kvm_arch.c
index 076a55d59988..e7708bfa0360 100644
--- a/virt/kvm/kvm_arch.c
+++ b/virt/kvm/kvm_arch.c
@@ -12,23 +12,16 @@
#include <linux/kvm_host.h>
-static cpumask_t cpus_hardware_enabled = CPU_MASK_NONE;
-
static int __hardware_enable(void)
{
- int cpu = raw_smp_processor_id();
int r;
WARN_ON_ONCE(preemptible());
- if (cpumask_test_cpu(cpu, &cpus_hardware_enabled))
- return 0;
r = kvm_arch_hardware_enable();
if (r)
pr_warn("kvm: enabling virtualization on CPU%d failed during %pSb\n",
- cpu, __builtin_return_address(0));
- else
- cpumask_set_cpu(cpu, &cpus_hardware_enabled);
+ smp_processor_id(), __builtin_return_address(0));
return r;
}
@@ -42,13 +35,7 @@ static void hardware_enable(void *arg)
static void hardware_disable(void *junk)
{
- int cpu = raw_smp_processor_id();
-
WARN_ON_ONCE(preemptible());
-
- if (!cpumask_test_cpu(cpu, &cpus_hardware_enabled))
- return;
- cpumask_clear_cpu(cpu, &cpus_hardware_enabled);
kvm_arch_hardware_disable();
}
--
2.25.1
