LoongArch: KVM: Prevent division by zero in periodic timer restore

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A guest can write CSR.TCFG with the periodic bit set but a period value
of zero. When kvm_restore_timer() later enters the periodic branch,
period = cfg & CSR_TCFG_VAL evaluates to 0, causing (delta % period) to
trigger a division by zero and crash the host kernel.

Clamp the period to 1 to avoid the panic.

Fixes: a5857b9ff6 ("LoongArch: KVM: Implement vcpu timer operations")
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 2026-08-10 12:21:50 +08:00 • committed by Huacai Chen

parent fe41c0759b

commit 01c823f14e

1 changed files with 2 additions and 0 deletions

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arch/loongarch/kvm/timer.c

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