LoongArch: KVM: Reload one-shot TVAL on migration destination

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kvm_restore_timer() rebuilds the remaining timer countdown value from
vcpu->arch.expire, which is host-internal and is not part of the
migrated vCPU state. On the migration destination it is still 0, so for
a one-shot timer that has not expired yet the computed delta is 0 and
write_gcsr_timertick(0) injects the timer interrupt immediately instead
of after the remaining time.

The expired one-shot case (TVAL = -1) is already handled earlier. When
expire has not been set (i.e. on the migration destination), reload the
remaining countdown value from the migrated TVAL. This covers both one-
shot and periodic timers. The regular preempt/resume path on the source,
where expire is valid, is unchanged.

Fixes: a5857b9ff6 ("LoongArch: KVM: Implement vcpu timer operations")
Suggested-by: Bibo Mao <maobibo@loongson.cn>
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 a5518ad7ef

commit fe41c0759b

1 changed files with 12 additions and 0 deletions

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arch/loongarch/kvm/timer.c

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