blob: 676022e717919533cfd6d35ad782cb712e6608a6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
// 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/desc.h>
#include <asm/hypervisor.h>
#include <asm/irq_regs.h>
static uint32_t __init acrn_detect(void)
{
return hypervisor_cpuid_base("ACRNACRNACRN\0\0", 0);
}
static void __init acrn_init_platform(void)
{
/* Setup the IDT for ACRN hypervisor callback */
alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, acrn_hv_callback_vector);
}
static bool acrn_x2apic_available(void)
{
/*
* x2apic is not supported for now. Future enablement will have to check
* X86_FEATURE_X2APIC to determine whether x2apic is supported in the
* guest.
*/
return false;
}
static void (*acrn_intr_handler)(void);
__visible void __irq_entry acrn_hv_vector_handler(struct pt_regs *regs)
{
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.
*/
entering_ack_irq();
inc_irq_stat(irq_hv_callback_count);
if (acrn_intr_handler)
acrn_intr_handler();
exiting_irq();
set_irq_regs(old_regs);
}
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,
};
|
