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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kexec.c (1670B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Copyright 2006 Michael Ellerman, IBM Corporation
      4 */
      5
      6#include <linux/kernel.h>
      7#include <linux/interrupt.h>
      8
      9#include <asm/machdep.h>
     10#include <asm/page.h>
     11#include <asm/firmware.h>
     12#include <asm/kexec.h>
     13#include <asm/xics.h>
     14#include <asm/xive.h>
     15#include <asm/smp.h>
     16#include <asm/plpar_wrappers.h>
     17
     18#include "pseries.h"
     19
     20void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
     21{
     22	/*
     23	 * Don't risk a hypervisor call if we're crashing
     24	 * XXX: Why? The hypervisor is not crashing. It might be better
     25	 * to at least attempt unregister to avoid the hypervisor stepping
     26	 * on our memory.
     27	 */
     28	if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
     29		int ret;
     30		int cpu = smp_processor_id();
     31		int hwcpu = hard_smp_processor_id();
     32
     33		if (get_lppaca()->dtl_enable_mask) {
     34			ret = unregister_dtl(hwcpu);
     35			if (ret) {
     36				pr_err("WARNING: DTL deregistration for cpu "
     37				       "%d (hw %d) failed with %d\n",
     38				       cpu, hwcpu, ret);
     39			}
     40		}
     41
     42		ret = unregister_slb_shadow(hwcpu);
     43		if (ret) {
     44			pr_err("WARNING: SLB shadow buffer deregistration "
     45			       "for cpu %d (hw %d) failed with %d\n",
     46			       cpu, hwcpu, ret);
     47		}
     48
     49		ret = unregister_vpa(hwcpu);
     50		if (ret) {
     51			pr_err("WARNING: VPA deregistration for cpu %d "
     52			       "(hw %d) failed with %d\n", cpu, hwcpu, ret);
     53		}
     54	}
     55
     56	if (xive_enabled()) {
     57		xive_teardown_cpu();
     58
     59		if (!secondary)
     60			xive_shutdown();
     61	} else
     62		xics_kexec_teardown_cpu(secondary);
     63}
     64
     65void pseries_machine_kexec(struct kimage *image)
     66{
     67	if (firmware_has_feature(FW_FEATURE_SET_MODE))
     68		pseries_disable_reloc_on_exc();
     69
     70	default_machine_kexec(image);
     71}