6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Bibo Mao maobibo@loongson.cn
commit 6ce031e5d6f475d476bab55ab7d8ea168fedc4c1 upstream.
Native IPI is used for AP booting, because it is the booting interface between OS and BIOS firmware. The paravirt IPI is only used inside OS, and native IPI is necessary to boot AP.
When booting AP, we write the kernel entry address in the HW mailbox of AP and send IPI interrupt to it. AP executes idle instruction and waits for interrupts or SW events, then clears IPI interrupt and jumps to the kernel entry from HW mailbox.
Between writing HW mailbox and sending IPI, AP can be woken up by SW events and jumps to the kernel entry, so ACTION_BOOT_CPU IPI interrupt will keep pending during AP booting. And native IPI interrupt handler needs be registered so that it can clear pending native IPI, else there will be endless interrupts during AP booting stage.
Here native IPI interrupt is initialized even if paravirt IPI is used.
Cc: stable@vger.kernel.org Fixes: 74c16b2e2b0c ("LoongArch: KVM: Add PV IPI support on guest side") Signed-off-by: Bibo Mao maobibo@loongson.cn Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/loongarch/kernel/paravirt.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
--- a/arch/loongarch/kernel/paravirt.c +++ b/arch/loongarch/kernel/paravirt.c @@ -50,11 +50,18 @@ static u64 paravt_steal_clock(int cpu) }
#ifdef CONFIG_SMP +static struct smp_ops native_ops; + static void pv_send_ipi_single(int cpu, unsigned int action) { int min, old; irq_cpustat_t *info = &per_cpu(irq_stat, cpu);
+ if (unlikely(action == ACTION_BOOT_CPU)) { + native_ops.send_ipi_single(cpu, action); + return; + } + old = atomic_fetch_or(BIT(action), &info->message); if (old) return; @@ -74,6 +81,11 @@ static void pv_send_ipi_mask(const struc if (cpumask_empty(mask)) return;
+ if (unlikely(action == ACTION_BOOT_CPU)) { + native_ops.send_ipi_mask(mask, action); + return; + } + action = BIT(action); for_each_cpu(i, mask) { info = &per_cpu(irq_stat, i); @@ -141,6 +153,8 @@ static void pv_init_ipi(void) { int r, swi;
+ /* Init native ipi irq for ACTION_BOOT_CPU */ + native_ops.init_ipi(); swi = get_percpu_irq(INT_SWI0); if (swi < 0) panic("SWI0 IRQ mapping failed\n"); @@ -179,6 +193,7 @@ int __init pv_ipi_init(void) return 0;
#ifdef CONFIG_SMP + native_ops = mp_ops; mp_ops.init_ipi = pv_init_ipi; mp_ops.send_ipi_single = pv_send_ipi_single; mp_ops.send_ipi_mask = pv_send_ipi_mask;