79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
// 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);
|
|
}
|
|
|
|
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,
|
|
};
|