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-rw-r--r--arch/x86/kernel/cpu/acrn.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
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+++ b/arch/x86/kernel/cpu/acrn.c
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+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ACRN detection support
+ *
+ * Copyright (C) 2019 Intel Corporation. All rights reserved.
+ *
+ * Jason Chen CJ <jason.cj.chen@intel.com>
+ * Zhao Yakui <yakui.zhao@intel.com>
+ *
+ */
+
+#include <linux/interrupt.h>
+
+#include <asm/acrn.h>
+#include <asm/apic.h>
+#include <asm/cpufeatures.h>
+#include <asm/desc.h>
+#include <asm/hypervisor.h>
+#include <asm/idtentry.h>
+#include <asm/irq_regs.h>
+
+static u32 __init acrn_detect(void)
+{
+ return acrn_cpuid_base();
+}
+
+static void __init acrn_init_platform(void)
+{
+ /* Setup the IDT for ACRN hypervisor callback */
+ alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_acrn_hv_callback);
+
+ x86_platform.calibrate_tsc = acrn_get_tsc_khz;
+ x86_platform.calibrate_cpu = acrn_get_tsc_khz;
+}
+
+static bool acrn_x2apic_available(void)
+{
+ return boot_cpu_has(X86_FEATURE_X2APIC);
+}
+
+static void (*acrn_intr_handler)(void);
+
+DEFINE_IDTENTRY_SYSVEC(sysvec_acrn_hv_callback)
+{
+ struct pt_regs *old_regs = set_irq_regs(regs);
+
+ /*
+ * The hypervisor requires that the APIC EOI should be acked.
+ * If the APIC EOI is not acked, the APIC ISR bit for the
+ * HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it
+ * will block the interrupt whose vector is lower than
+ * HYPERVISOR_CALLBACK_VECTOR.
+ */
+ ack_APIC_irq();
+ inc_irq_stat(irq_hv_callback_count);
+
+ if (acrn_intr_handler)
+ acrn_intr_handler();
+
+ set_irq_regs(old_regs);
+}
+
+void acrn_setup_intr_handler(void (*handler)(void))
+{
+ acrn_intr_handler = handler;
+}
+EXPORT_SYMBOL_GPL(acrn_setup_intr_handler);
+
+void acrn_remove_intr_handler(void)
+{
+ acrn_intr_handler = NULL;
+}
+EXPORT_SYMBOL_GPL(acrn_remove_intr_handler);
+
+const __initconst struct hypervisor_x86 x86_hyper_acrn = {
+ .name = "ACRN",
+ .detect = acrn_detect,
+ .type = X86_HYPER_ACRN,
+ .init.init_platform = acrn_init_platform,
+ .init.x2apic_available = acrn_x2apic_available,
+};