Re: [PATCH] RISC-V: KVM: Use raw_spinlock for VMID update critical section
Sebastian Andrzej Siewior <[email protected]>
| Newsgroups | dev.linux.lists.linux-rt-devel,org.infradead.lists.kvm-riscv,org.infradead.lists.linux-riscv,org.kernel.vger.kvm,org.kernel.vger.linux-kernel |
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| Message-ID | <[email protected]> |
On 2026-07-16 14:40:11 [+0800], [email protected] wrote: > From: "Yuhang.chen" <[email protected]> > > The VMID update critical section performs an IPI broadcast via > on_each_cpu_mask() on VMID version rollover, which must not be preempted > under PREEMPT_RT. Here you state _why_ it must not be preempted. What would be the worst that could happen. > Convert vmid_lock to raw_spinlock_t and use plain That part starting with "Convert" belongs into into a new line. > raw_spin_lock()/raw_spin_unlock() (interrupts stay enabled, since > on_each_cpu_mask() requires it). > > Assisted-by: YuanSheng:deepseek-v4-pro > Co-developed-by: Quan Zhou <[email protected]> > Signed-off-by: Quan Zhou <[email protected]> > Signed-off-by: Yuhang.chen <[email protected]> Sebastian