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KVM: Ensure CPU is stable during low level hardware enable/disable

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Use the non-raw smp_processor_id() in the low hardware enable/disable
helpers as KVM absolutely relies on the CPU being stable, e.g. KVM would
end up with incorrect state if the task were migrated between accessing
cpus_hardware_enabled and actually enabling/disabling hardware.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221130230934.1014142-44-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2022-11-30 23:09:27 +00:00
committed by Paolo Bonzini
parent e4aa7f88af
commit 2c106f2900
1 changed files with 2 additions and 2 deletions
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4
virt/kvm/kvm_main.c
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@@ -5097,7 +5097,7 @@ static struct miscdevice kvm_dev = {
static void hardware_enable_nolock(void *junk) static void hardware_enable_nolock(void *junk)
{ {
int cpu = raw_smp_processor_id(); int cpu = smp_processor_id();
int r; int r;
if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
@@ -5139,7 +5139,7 @@ static int kvm_online_cpu(unsigned int cpu)
static void hardware_disable_nolock(void *junk) static void hardware_disable_nolock(void *junk)
{ {
int cpu = raw_smp_processor_id(); int cpu = smp_processor_id();
if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
return; return;