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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/arch/powerpc/kvm/book3s_hv_ras.c
....@@ -1,7 +1,5 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
2
- * This program is free software; you can redistribute it and/or modify
3
- * it under the terms of the GNU General Public License, version 2, as
4
- * published by the Free Software Foundation.
53  *
64  * Copyright 2012 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
75  */
....@@ -11,6 +9,7 @@
119 #include <linux/kvm.h>
1210 #include <linux/kvm_host.h>
1311 #include <linux/kernel.h>
12
+#include <asm/lppaca.h>
1413 #include <asm/opal.h>
1514 #include <asm/mce.h>
1615 #include <asm/machdep.h>
....@@ -66,10 +65,8 @@
6665 /*
6766  * On POWER7, see if we can handle a machine check that occurred inside
6867  * the guest in real mode, without switching to the host partition.
69
- *
70
- * Returns: 0 => exit guest, 1 => deliver machine check to guest
7168  */
72
-static long kvmppc_realmode_mc_power7(struct kvm_vcpu *vcpu)
69
+static void kvmppc_realmode_mc_power7(struct kvm_vcpu *vcpu)
7370 {
7471 	unsigned long srr1 = vcpu->arch.shregs.msr;
7572 	struct machine_check_event mce_evt;
....@@ -111,52 +108,24 @@
111108 	}
112109 
113110 	/*
114
-	 * See if we have already handled the condition in the linux host.
115
-	 * We assume that if the condition is recovered then linux host
116
-	 * will have generated an error log event that we will pick
117
-	 * up and log later.
118
-	 * Don't release mce event now. We will queue up the event so that
119
-	 * we can log the MCE event info on host console.
111
+	 * Now get the event and stash it in the vcpu struct so it can
112
+	 * be handled by the primary thread in virtual mode.  We can't
113
+	 * call machine_check_queue_event() here if we are running on
114
+	 * an offline secondary thread.
120115 	 */
121
-	if (!get_mce_event(&mce_evt, MCE_EVENT_DONTRELEASE))
122
-		goto out;
116
+	if (get_mce_event(&mce_evt, MCE_EVENT_RELEASE)) {
117
+		if (handled && mce_evt.version == MCE_V1)
118
+			mce_evt.disposition = MCE_DISPOSITION_RECOVERED;
119
+	} else {
120
+		memset(&mce_evt, 0, sizeof(mce_evt));
121
+	}
123122 
124
-	if (mce_evt.version == MCE_V1 &&
125
-	    (mce_evt.severity == MCE_SEV_NO_ERROR ||
126
-	     mce_evt.disposition == MCE_DISPOSITION_RECOVERED))
127
-		handled = 1;
128
-
129
-out:
130
-	/*
131
-	 * For guest that supports FWNMI capability, hook the MCE event into
132
-	 * vcpu structure. We are going to exit the guest with KVM_EXIT_NMI
133
-	 * exit reason. On our way to exit we will pull this event from vcpu
134
-	 * structure and print it from thread 0 of the core/subcore.
135
-	 *
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-	 * For guest that does not support FWNMI capability (old QEMU):
137
-	 * We are now going enter guest either through machine check
138
-	 * interrupt (for unhandled errors) or will continue from
139
-	 * current HSRR0 (for handled errors) in guest. Hence
140
-	 * queue up the event so that we can log it from host console later.
141
-	 */
142
-	if (vcpu->kvm->arch.fwnmi_enabled) {
143
-		/*
144
-		 * Hook up the mce event on to vcpu structure.
145
-		 * First clear the old event.
146
-		 */
147
-		memset(&vcpu->arch.mce_evt, 0, sizeof(vcpu->arch.mce_evt));
148
-		if (get_mce_event(&mce_evt, MCE_EVENT_RELEASE)) {
149
-			vcpu->arch.mce_evt = mce_evt;
150
-		}
151
-	} else
152
-		machine_check_queue_event();
153
-
154
-	return handled;
123
+	vcpu->arch.mce_evt = mce_evt;
155124 }
156125 
157
-long kvmppc_realmode_machine_check(struct kvm_vcpu *vcpu)
126
+void kvmppc_realmode_machine_check(struct kvm_vcpu *vcpu)
158127 {
159
-	return kvmppc_realmode_mc_power7(vcpu);
128
+	kvmppc_realmode_mc_power7(vcpu);
160129 }
161130 
162131 /* Check if dynamic split is in force and return subcore size accordingly. */
....@@ -177,6 +146,7 @@
177146 
178147 	local_paca->sibling_subcore_state->in_guest[subcore_id] = 1;
179148 }
149
+EXPORT_SYMBOL_GPL(kvmppc_subcore_enter_guest);
180150 
181151 void kvmppc_subcore_exit_guest(void)
182152 {
....@@ -187,6 +157,7 @@
187157 
188158 	local_paca->sibling_subcore_state->in_guest[subcore_id] = 0;
189159 }
160
+EXPORT_SYMBOL_GPL(kvmppc_subcore_exit_guest);
190161 
191162 static bool kvmppc_tb_resync_required(void)
192163 {
....@@ -274,7 +245,7 @@
274245 {
275246 	bool resync_req;
276247 
277
-	__this_cpu_inc(irq_stat.hmi_exceptions);
248
+	local_paca->hmi_irqs++;
278249 
279250 	if (hmi_handle_debugtrig(NULL) >= 0)
280251 		return 1;
....@@ -331,5 +302,13 @@
331302 	} else {
332303 		wait_for_tb_resync();
333304 	}
305
+
306
+	/*
307
+	 * Reset tb_offset_applied so the guest exit code won't try
308
+	 * to subtract the previous timebase offset from the timebase.
309
+	 */
310
+	if (local_paca->kvm_hstate.kvm_vcore)
311
+		local_paca->kvm_hstate.kvm_vcore->tb_offset_applied = 0;
312
+
334313 	return 0;
335314 }