// SPDX-License-Identifier: GPL-2.0
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/*
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* ACRN detection support
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*
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* Copyright (C) 2019 Intel Corporation. All rights reserved.
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*
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* Jason Chen CJ <jason.cj.chen@intel.com>
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* Zhao Yakui <yakui.zhao@intel.com>
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*
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*/
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#include <linux/interrupt.h>
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#include <asm/apic.h>
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#include <asm/cpufeatures.h>
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#include <asm/desc.h>
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#include <asm/hypervisor.h>
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#include <asm/idtentry.h>
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#include <asm/irq_regs.h>
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static u32 __init acrn_detect(void)
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{
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return hypervisor_cpuid_base("ACRNACRNACRN", 0);
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}
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static void __init acrn_init_platform(void)
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{
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/* Setup the IDT for ACRN hypervisor callback */
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alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_acrn_hv_callback);
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}
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static bool acrn_x2apic_available(void)
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{
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return boot_cpu_has(X86_FEATURE_X2APIC);
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}
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static void (*acrn_intr_handler)(void);
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DEFINE_IDTENTRY_SYSVEC_PIPELINED(HYPERVISOR_CALLBACK_VECTOR,
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sysvec_acrn_hv_callback)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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/*
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* The hypervisor requires that the APIC EOI should be acked.
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* If the APIC EOI is not acked, the APIC ISR bit for the
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* HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it
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* will block the interrupt whose vector is lower than
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* HYPERVISOR_CALLBACK_VECTOR.
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*/
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ack_APIC_irq();
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inc_irq_stat(irq_hv_callback_count);
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if (acrn_intr_handler)
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acrn_intr_handler();
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set_irq_regs(old_regs);
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}
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const __initconst struct hypervisor_x86 x86_hyper_acrn = {
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.name = "ACRN",
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.detect = acrn_detect,
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.type = X86_HYPER_ACRN,
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.init.init_platform = acrn_init_platform,
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.init.x2apic_available = acrn_x2apic_available,
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};
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