LoongArch: KVM: Fix TOCTOU race on pv_features

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In kvm_loongarch_cpucfg_set_attr() the check-then-set on
kvm->arch.pv_features is lockless, so two vCPUs can race past the
validation and set different values. Add a spinlock to protect it.

Cc: stable@vger.kernel.org
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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Tao Cui 2026-09-04 21:45:13 +08:00 • committed by Huacai Chen

parent 501514d6eb

commit 9296375902

3 changed files with 7 additions and 1 deletions

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1

arch/loongarch/include/asm/kvm_host.h

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arch/loongarch/kvm/vcpu.c

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1

arch/loongarch/kvm/vm.c

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