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Message-ID: <71e41192775133b551270776356ad1fbc6a8a222.camel@infradead.org>
Subject: Re: [PATCH] use x86 cpu park to speedup smp_init in kexec situation
From:   David Woodhouse <dwmw2@infradead.org>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Andy Lutomirski <luto@kernel.org>,
        "shenkai (D)" <shenkai8@huawei.com>,
        "Schander, Johanna 'Mimoja' Amelie" <mimoja@amazon.com>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        X86 ML <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        hewenliang4@huawei.com, hushiyuan@huawei.com,
        luolongjun@huawei.com, hejingxian@huawei.com
Date:   Thu, 21 Jan 2021 17:34:48 +0000
In-Reply-To: <22a9d92f51e0c6f8d4a3928b91f7f75e0297b93a.camel@infradead.org>
References: <87eejqu5q5.fsf@nanos.tec.linutronix.de>
         <8ac72d7b287ed1058b2dec3301578238aff0abdd.camel@infradead.org>
         <877do65og8.fsf@nanos.tec.linutronix.de>
         <22a9d92f51e0c6f8d4a3928b91f7f75e0297b93a.camel@infradead.org>
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On Thu, 2021-01-21 at 15:42 +0000, David Woodhouse wrote:
> [    2.289283] BUG: kernel NULL pointer dereference, address: 00000000000=
00000
> [    2.289283] #PF: supervisor write access in kernel mode
> [    2.289283] #PF: error_code(0x0002) - not-present page
> [    2.289283] PGD 0 P4D 0=20
> [    2.289283] Oops: 0002 [#1] SMP PTI
> [    2.289283] CPU: 32 PID: 0 Comm: swapper/32 Not tainted 5.10.0+ #745
> [    2.289283] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1=
.14.0-1.fc33 04/01/2014
> [    2.289283] RIP: 0010:init_x2apic_ldr+0xa0/0xb0


OK... in alloc_clustermask() for each CPU we were preallocating a
cluster_mask and storing it in the global cluster_hotplug_mask.

Then later for each CPU we were taking the preallocated cluster_mask
and setting cluster_hotplug_mask to NULL.

That doesn't parallelise well :)

So... ditch the global variable, let alloc_clustermask() install the
appropriate cluster_mask *directly* into the target CPU's per_cpu data
before it's running. And since we have to calculate the logical APIC ID
for the cluster ID, we might as well set x86_cpu_to_logical_apicid at
the same time.

Now all that init_x2apic_ldr() actually *does* on the target CPU is set
that CPU's bit in the pre-existing cluster_mask.

To reduce the number of loops over all (present or online) CPUs, I've
made it set the per_cpu cluster_mask for *all* CPUs in the cluster in
one pass at boot time. I think the case for later hotplug is also sane;
will have to test that.

But it passes that qemu boot test it was failing earlier, at least...
=20
diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x=
2apic_cluster.c
index b0889c48a2ac..74bb4cae8b5b 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -18,7 +18,6 @@ struct cluster_mask {
 static DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
 static DEFINE_PER_CPU(cpumask_var_t, ipi_mask);
 static DEFINE_PER_CPU(struct cluster_mask *, cluster_masks);
-static struct cluster_mask *cluster_hotplug_mask;
=20
 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
@@ -98,54 +97,61 @@ static u32 x2apic_calc_apicid(unsigned int cpu)
 static void init_x2apic_ldr(void)
 {
 	struct cluster_mask *cmsk =3D this_cpu_read(cluster_masks);
-	u32 cluster, apicid =3D apic_read(APIC_LDR);
-	unsigned int cpu;
=20
-	this_cpu_write(x86_cpu_to_logical_apicid, apicid);
+	BUG_ON(!cmsk);
=20
-	if (cmsk)
-		goto update;
-
-	cluster =3D apicid >> 16;
-	for_each_online_cpu(cpu) {
-		cmsk =3D per_cpu(cluster_masks, cpu);
-		/* Matching cluster found. Link and update it. */
-		if (cmsk && cmsk->clusterid =3D=3D cluster)
-			goto update;
-	}
-	cmsk =3D cluster_hotplug_mask;
-	cmsk->clusterid =3D cluster;
-	cluster_hotplug_mask =3D NULL;
-update:
-	this_cpu_write(cluster_masks, cmsk);
 	cpumask_set_cpu(smp_processor_id(), &cmsk->mask);
 }
=20
-static int alloc_clustermask(unsigned int cpu, int node)
+static int alloc_clustermask(unsigned int cpu, u32 cluster, int node)
 {
+	struct cluster_mask *cmsk =3D NULL;
+	u32 apicid;
+
 	if (per_cpu(cluster_masks, cpu))
 		return 0;
-	/*
-	 * If a hotplug spare mask exists, check whether it's on the right
-	 * node. If not, free it and allocate a new one.
+
+	/* For the hotplug case, don't always allocate a new one */
+	for_each_online_cpu(cpu) {
+		apicid =3D apic->cpu_present_to_apicid(cpu);
+		if (apicid !=3D BAD_APICID && apicid >> 4 =3D=3D cluster) {
+			cmsk =3D per_cpu(cluster_masks, cpu);
+			if (cmsk)
+				break;
+		}
+	}
+	if (!cmsk)
+		cmsk =3D kzalloc_node(sizeof(*cmsk), GFP_KERNEL, node);
+	if (!cmsk)
+		return -ENOMEM;
+
+	cmsk->node =3D node;
+	cmsk->clusterid =3D cluster;
+
+        /*
+	 * As an optimisation during boot, set the cluster_mask for *all*
+	 * present CPUs at once, which will include 'cpu'.
 	 */
-	if (cluster_hotplug_mask) {
-		if (cluster_hotplug_mask->node =3D=3D node)
-			return 0;
-		kfree(cluster_hotplug_mask);
+	if (system_state < SYSTEM_RUNNING) {
+		for_each_present_cpu(cpu) {
+			u32 apicid =3D apic->cpu_present_to_apicid(cpu);
+			if (apicid !=3D BAD_APICID && apicid >> 4 =3D=3D cluster)
+				per_cpu(cluster_masks, cpu) =3D cmsk;
+		}
 	}
=20
-	cluster_hotplug_mask =3D kzalloc_node(sizeof(*cluster_hotplug_mask),
-					    GFP_KERNEL, node);
-	if (!cluster_hotplug_mask)
-		return -ENOMEM;
-	cluster_hotplug_mask->node =3D node;
 	return 0;
 }
=20
 static int x2apic_prepare_cpu(unsigned int cpu)
 {
-	if (alloc_clustermask(cpu, cpu_to_node(cpu)) < 0)
+	u32 phys_apicid =3D apic->cpu_present_to_apicid(cpu);
+	u32 cluster =3D phys_apicid >> 4;
+	u32 logical_apicid =3D (cluster << 16) | (1 << (phys_apicid & 0xf));
+
+	per_cpu(x86_cpu_to_logical_apicid, cpu) =3D logical_apicid;
+
+	if (alloc_clustermask(cpu, cluster, cpu_to_node(cpu)) < 0)
 		return -ENOMEM;
 	if (!zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL))
 		return -ENOMEM;

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