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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irq.c (1407B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/hardirq.h>
      3
      4#include <asm/x86_init.h>
      5
      6#include <xen/interface/xen.h>
      7#include <xen/interface/sched.h>
      8#include <xen/interface/vcpu.h>
      9#include <xen/features.h>
     10#include <xen/events.h>
     11
     12#include <asm/xen/hypercall.h>
     13#include <asm/xen/hypervisor.h>
     14
     15#include "xen-ops.h"
     16
     17/*
     18 * Force a proper event-channel callback from Xen after clearing the
     19 * callback mask. We do this in a very simple manner, by making a call
     20 * down into Xen. The pending flag will be checked by Xen on return.
     21 */
     22noinstr void xen_force_evtchn_callback(void)
     23{
     24	(void)HYPERVISOR_xen_version(0, NULL);
     25}
     26
     27static void xen_safe_halt(void)
     28{
     29	/* Blocking includes an implicit local_irq_enable(). */
     30	if (HYPERVISOR_sched_op(SCHEDOP_block, NULL) != 0)
     31		BUG();
     32}
     33
     34static void xen_halt(void)
     35{
     36	if (irqs_disabled())
     37		HYPERVISOR_vcpu_op(VCPUOP_down,
     38				   xen_vcpu_nr(smp_processor_id()), NULL);
     39	else
     40		xen_safe_halt();
     41}
     42
     43static const typeof(pv_ops) xen_irq_ops __initconst = {
     44	.irq = {
     45		/* Initial interrupt flag handling only called while interrupts off. */
     46		.save_fl = __PV_IS_CALLEE_SAVE(paravirt_ret0),
     47		.irq_disable = __PV_IS_CALLEE_SAVE(paravirt_nop),
     48		.irq_enable = __PV_IS_CALLEE_SAVE(paravirt_BUG),
     49
     50		.safe_halt = xen_safe_halt,
     51		.halt = xen_halt,
     52	},
     53};
     54
     55void __init xen_init_irq_ops(void)
     56{
     57	pv_ops.irq = xen_irq_ops.irq;
     58	x86_init.irqs.intr_init = xen_init_IRQ;
     59}