cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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acrn.c (1815B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * ACRN detection support
      4 *
      5 * Copyright (C) 2019 Intel Corporation. All rights reserved.
      6 *
      7 * Jason Chen CJ <jason.cj.chen@intel.com>
      8 * Zhao Yakui <yakui.zhao@intel.com>
      9 *
     10 */
     11
     12#include <linux/interrupt.h>
     13
     14#include <asm/acrn.h>
     15#include <asm/apic.h>
     16#include <asm/cpufeatures.h>
     17#include <asm/desc.h>
     18#include <asm/hypervisor.h>
     19#include <asm/idtentry.h>
     20#include <asm/irq_regs.h>
     21
     22static u32 __init acrn_detect(void)
     23{
     24	return acrn_cpuid_base();
     25}
     26
     27static void __init acrn_init_platform(void)
     28{
     29	/* Setup the IDT for ACRN hypervisor callback */
     30	alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_acrn_hv_callback);
     31}
     32
     33static bool acrn_x2apic_available(void)
     34{
     35	return boot_cpu_has(X86_FEATURE_X2APIC);
     36}
     37
     38static void (*acrn_intr_handler)(void);
     39
     40DEFINE_IDTENTRY_SYSVEC(sysvec_acrn_hv_callback)
     41{
     42	struct pt_regs *old_regs = set_irq_regs(regs);
     43
     44	/*
     45	 * The hypervisor requires that the APIC EOI should be acked.
     46	 * If the APIC EOI is not acked, the APIC ISR bit for the
     47	 * HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it
     48	 * will block the interrupt whose vector is lower than
     49	 * HYPERVISOR_CALLBACK_VECTOR.
     50	 */
     51	ack_APIC_irq();
     52	inc_irq_stat(irq_hv_callback_count);
     53
     54	if (acrn_intr_handler)
     55		acrn_intr_handler();
     56
     57	set_irq_regs(old_regs);
     58}
     59
     60void acrn_setup_intr_handler(void (*handler)(void))
     61{
     62	acrn_intr_handler = handler;
     63}
     64EXPORT_SYMBOL_GPL(acrn_setup_intr_handler);
     65
     66void acrn_remove_intr_handler(void)
     67{
     68	acrn_intr_handler = NULL;
     69}
     70EXPORT_SYMBOL_GPL(acrn_remove_intr_handler);
     71
     72const __initconst struct hypervisor_x86 x86_hyper_acrn = {
     73	.name                   = "ACRN",
     74	.detect                 = acrn_detect,
     75	.type			= X86_HYPER_ACRN,
     76	.init.init_platform     = acrn_init_platform,
     77	.init.x2apic_available  = acrn_x2apic_available,
     78};