From: Tao Cui <cui.tao@linux.dev>
To: zhaotianrui@loongson.cn, maobibo@loongson.cn
Cc: chenhuacai@kernel.org, kernel@xen0n.name, kvm@vger.kernel.org,
loongarch@lists.linux.dev, linux-kernel@vger.kernel.org,
lixianglai@loongson.cn, cuitao@kylinos.cn, cui.tao@linux.dev
Subject: [PATCH v3 0/2] LoongArch: KVM: Fix timer restore issues
Date: Wed, 15 Jul 2026 18:06:38 +0800 [thread overview]
Message-ID: <20260715100640.1454413-1-cui.tao@linux.dev> (raw)
From: Tao Cui <cuitao@kylinos.cn>
Fix two issues in kvm_restore_timer():
Patch 1 fixes a one-shot timer firing immediately after migration because
vcpu->arch.expire is not migrated.
Patch 2 fixes a division-by-zero crash when a guest programs a periodic
timer with a period value of zero.
Both are in the same function (kvm_restore_timer) and are sent as a
series for convenience.
Tao Cui (2):
LoongArch: KVM: Reload one-shot TVAL on migration destination
LoongArch: KVM: Prevent division by zero in periodic timer restore
arch/loongarch/kvm/timer.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
---
Changes in v3:
- Add patch 2 (division by zero fix, found by Sashiko AI review).
- Reuse the existing now timestamp instead of a redundant ktime_get().
Changes in v2:
- Move the expire check before ktime_before() (suggested by Bibo Mao)
- Remove the old else-if branch that was one-shot only.
--
2.43.0
next reply other threads:[~2026-07-15 10:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-15 10:06 Tao Cui [this message]
2026-07-15 10:06 ` [PATCH v3 1/2] LoongArch: KVM: Reload one-shot TVAL on migration destination Tao Cui
2026-07-15 10:06 ` [PATCH v3 2/2] LoongArch: KVM: Prevent division by zero in periodic timer restore Tao Cui
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