cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

smp_hvm.c (2081B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/thread_info.h>
      3#include <asm/smp.h>
      4
      5#include <xen/events.h>
      6
      7#include "xen-ops.h"
      8#include "smp.h"
      9
     10
     11static void __init xen_hvm_smp_prepare_boot_cpu(void)
     12{
     13	BUG_ON(smp_processor_id() != 0);
     14	native_smp_prepare_boot_cpu();
     15
     16	/*
     17	 * Setup vcpu_info for boot CPU. Secondary CPUs get their vcpu_info
     18	 * in xen_cpu_up_prepare_hvm().
     19	 */
     20	xen_vcpu_setup(0);
     21
     22	/*
     23	 * Called again in case the kernel boots on vcpu >= MAX_VIRT_CPUS.
     24	 * Refer to comments in xen_hvm_init_time_ops().
     25	 */
     26	xen_hvm_init_time_ops();
     27
     28	/*
     29	 * The alternative logic (which patches the unlock/lock) runs before
     30	 * the smp bootup up code is activated. Hence we need to set this up
     31	 * the core kernel is being patched. Otherwise we will have only
     32	 * modules patched but not core code.
     33	 */
     34	xen_init_spinlocks();
     35}
     36
     37static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
     38{
     39	int cpu;
     40
     41	native_smp_prepare_cpus(max_cpus);
     42
     43	if (xen_have_vector_callback) {
     44		WARN_ON(xen_smp_intr_init(0));
     45		xen_init_lock_cpu(0);
     46	}
     47
     48	for_each_possible_cpu(cpu) {
     49		if (cpu == 0)
     50			continue;
     51
     52		/* Set default vcpu_id to make sure that we don't use cpu-0's */
     53		per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID;
     54	}
     55}
     56
     57#ifdef CONFIG_HOTPLUG_CPU
     58static void xen_hvm_cpu_die(unsigned int cpu)
     59{
     60	if (common_cpu_die(cpu) == 0) {
     61		if (xen_have_vector_callback) {
     62			xen_smp_intr_free(cpu);
     63			xen_uninit_lock_cpu(cpu);
     64			xen_teardown_timer(cpu);
     65		}
     66	}
     67}
     68#else
     69static void xen_hvm_cpu_die(unsigned int cpu)
     70{
     71	BUG();
     72}
     73#endif
     74
     75void __init xen_hvm_smp_init(void)
     76{
     77	smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
     78	smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
     79	smp_ops.smp_cpus_done = xen_smp_cpus_done;
     80	smp_ops.cpu_die = xen_hvm_cpu_die;
     81
     82	if (!xen_have_vector_callback) {
     83#ifdef CONFIG_PARAVIRT_SPINLOCKS
     84		nopvspin = true;
     85#endif
     86		return;
     87	}
     88
     89	smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
     90	smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
     91	smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
     92}