| Date | Wed, 30 Nov 2022 23:09:27 +0000 | Subject | [PATCH v2 43/50] KVM: Ensure CPU is stable during low level hardware enable/disable | From | Sean Christopherson <> |
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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> --- virt/kvm/kvm_main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d985b24c423b..a46d61e9c053 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5028,7 +5028,7 @@ static struct miscdevice kvm_dev = { static void hardware_enable_nolock(void *junk) { - int cpu = raw_smp_processor_id(); + int cpu = smp_processor_id(); int r; if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) @@ -5070,7 +5070,7 @@ static int kvm_online_cpu(unsigned int cpu) 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)) return; -- 2.38.1.584.g0f3c55d4c2-goog
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