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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/******************************************************************************
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* arch/ia64/xen/hypervisor.c
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*
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* Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
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* VA Linux Systems Japan K.K.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/efi.h>
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#include <linux/export.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/privop.h>
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#include "irq_xen.h"
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struct shared_info *HYPERVISOR_shared_info __read_mostly =
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(struct shared_info *)XSI_BASE;
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EXPORT_SYMBOL(HYPERVISOR_shared_info);
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DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
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struct start_info *xen_start_info;
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EXPORT_SYMBOL(xen_start_info);
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EXPORT_SYMBOL(xen_domain_type);
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EXPORT_SYMBOL(__hypercall);
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/* Stolen from arch/x86/xen/enlighten.c */
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/*
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* Flag to determine whether vcpu info placement is available on all
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* VCPUs. We assume it is to start with, and then set it to zero on
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* the first failure. This is because it can succeed on some VCPUs
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* and not others, since it can involve hypervisor memory allocation,
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* or because the guest failed to guarantee all the appropriate
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* constraints on all VCPUs (ie buffer can't cross a page boundary).
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*
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* Note that any particular CPU may be using a placed vcpu structure,
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* but we can only optimise if the all are.
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*
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* 0: not available, 1: available
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*/
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static void __init xen_vcpu_setup(int cpu)
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{
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/*
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* WARNING:
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* before changing MAX_VIRT_CPUS,
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* check that shared_info fits on a page
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*/
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BUILD_BUG_ON(sizeof(struct shared_info) > PAGE_SIZE);
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per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
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}
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void __init xen_setup_vcpu_info_placement(void)
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{
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int cpu;
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for_each_possible_cpu(cpu)
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xen_vcpu_setup(cpu);
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}
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void __cpuinit
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xen_cpu_init(void)
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{
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xen_smp_intr_init();
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}
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/**************************************************************************
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* opt feature
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*/
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void
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xen_ia64_enable_opt_feature(void)
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{
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/* Enable region 7 identity map optimizations in Xen */
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struct xen_ia64_opt_feature optf;
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optf.cmd = XEN_IA64_OPTF_IDENT_MAP_REG7;
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optf.on = XEN_IA64_OPTF_ON;
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optf.pgprot = pgprot_val(PAGE_KERNEL);
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optf.key = 0; /* No key on linux. */
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HYPERVISOR_opt_feature(&optf);
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}
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