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

suspend.c (1583B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/types.h>
      3#include <linux/tick.h>
      4#include <linux/percpu-defs.h>
      5
      6#include <xen/xen.h>
      7#include <xen/interface/xen.h>
      8#include <xen/grant_table.h>
      9#include <xen/events.h>
     10
     11#include <asm/cpufeatures.h>
     12#include <asm/msr-index.h>
     13#include <asm/xen/hypercall.h>
     14#include <asm/xen/page.h>
     15#include <asm/fixmap.h>
     16
     17#include "xen-ops.h"
     18#include "mmu.h"
     19#include "pmu.h"
     20
     21static DEFINE_PER_CPU(u64, spec_ctrl);
     22
     23void xen_arch_pre_suspend(void)
     24{
     25	xen_save_time_memory_area();
     26
     27	if (xen_pv_domain())
     28		xen_pv_pre_suspend();
     29}
     30
     31void xen_arch_post_suspend(int cancelled)
     32{
     33	if (xen_pv_domain())
     34		xen_pv_post_suspend(cancelled);
     35	else
     36		xen_hvm_post_suspend(cancelled);
     37
     38	xen_restore_time_memory_area();
     39}
     40
     41static void xen_vcpu_notify_restore(void *data)
     42{
     43	if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL))
     44		wrmsrl(MSR_IA32_SPEC_CTRL, this_cpu_read(spec_ctrl));
     45
     46	/* Boot processor notified via generic timekeeping_resume() */
     47	if (smp_processor_id() == 0)
     48		return;
     49
     50	tick_resume_local();
     51}
     52
     53static void xen_vcpu_notify_suspend(void *data)
     54{
     55	u64 tmp;
     56
     57	tick_suspend_local();
     58
     59	if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL)) {
     60		rdmsrl(MSR_IA32_SPEC_CTRL, tmp);
     61		this_cpu_write(spec_ctrl, tmp);
     62		wrmsrl(MSR_IA32_SPEC_CTRL, 0);
     63	}
     64}
     65
     66void xen_arch_resume(void)
     67{
     68	int cpu;
     69
     70	on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
     71
     72	for_each_online_cpu(cpu)
     73		xen_pmu_init(cpu);
     74}
     75
     76void xen_arch_suspend(void)
     77{
     78	int cpu;
     79
     80	for_each_online_cpu(cpu)
     81		xen_pmu_finish(cpu);
     82
     83	on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
     84}