path: root/arch/powerpc/kvm/book3s_hv.c

/*
 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *    Paul Mackerras <paulus@au1.ibm.com>
 *    Alexander Graf <agraf@suse.de>
 *    Kevin Wolf <mail@kevin-wolf.de>
 *
 * Description: KVM functions specific to running on Book 3S
 * processors in hypervisor mode (specifically POWER7 and later).
 *
 * This file is derived from arch/powerpc/kvm/book3s.c,
 * by Alexander Graf <agraf@suse.de>.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 */

#include <linux/kvm_host.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/preempt.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/cpumask.h>
#include <linux/spinlock.h>
#include <linux/page-flags.h>

#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu_context.h>
#include <asm/lppaca.h>
#include <asm/processor.h>
#include <asm/cputhreads.h>
#include <asm/page.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>

/*
 * For now, limit memory to 64GB and require it to be large pages.
 * This value is chosen because it makes the ram_pginfo array be
 * 64kB in size, which is about as large as we want to be trying
 * to allocate with kmalloc.
 */
#define MAX_MEM_ORDER		36

#define LARGE_PAGE_ORDER	24	/* 16MB pages */

/* #define EXIT_DEBUG */
/* #define EXIT_DEBUG_SIMPLE */
/* #define EXIT_DEBUG_INT */

void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	local_paca->kvm_hstate.kvm_vcpu = vcpu;
	local_paca->kvm_hstate.kvm_vcore = vcpu->arch.vcore;
}

void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
{
}

static void kvmppc_vcpu_blocked(struct kvm_vcpu *vcpu);
static void kvmppc_vcpu_unblocked(struct kvm_vcpu *vcpu);

void kvmppc_vcpu_block(struct kvm_vcpu *vcpu)
{
	u64 now;
	unsigned long dec_nsec;

	now = get_tb();
	if (now >= vcpu->arch.dec_expires && !kvmppc_core_pending_dec(vcpu))
		kvmppc_core_queue_dec(vcpu);
	if (vcpu->arch.pending_exceptions)
		return;
	if (vcpu->arch.dec_expires != ~(u64)0) {
		dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC /
			tb_ticks_per_sec;
		hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
			      HRTIMER_MODE_REL);
	}

	kvmppc_vcpu_blocked(vcpu);

	kvm_vcpu_block(vcpu);
	vcpu->stat.halt_wakeup++;

	if (vcpu->arch.dec_expires != ~(u64)0)
		hrtimer_try_to_cancel(&vcpu->arch.dec_timer);

	kvmppc_vcpu_unblocked(vcpu);
}

void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
{
	vcpu->arch.shregs.msr = msr;
}

void kvmppc_set_pvr(struct