path: root/arch/mips/kvm/kvm_mips.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * KVM/MIPS: MIPS specific KVM APIs
 *
 * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
 * Authors: Sanjay Lal <sanjayl@kymasys.com>
*/

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/bootmem.h>
#include <asm/page.h>
#include <asm/cacheflush.h>
#include <asm/mmu_context.h>

#include <linux/kvm_host.h>

#include "kvm_mips_int.h"
#include "kvm_mips_comm.h"

#define CREATE_TRACE_POINTS
#include "trace.h"

#ifndef VECTORSPACING
#define VECTORSPACING 0x100	/* for EI/VI mode */
#endif

#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ "wait", VCPU_STAT(wait_exits) },
	{ "cache", VCPU_STAT(cache_exits) },
	{ "signal", VCPU_STAT(signal_exits) },
	{ "interrupt", VCPU_STAT(int_exits) },
	{ "cop_unsuable", VCPU_STAT(cop_unusable_exits) },
	{ "tlbmod", VCPU_STAT(tlbmod_exits) },
	{ "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits) },
	{ "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits) },
	{ "addrerr_st", VCPU_STAT(addrerr_st_exits) },
	{ "addrerr_ld", VCPU_STAT(addrerr_ld_exits) },
	{ "syscall", VCPU_STAT(syscall_exits) },
	{ "resvd_inst", VCPU_STAT(resvd_inst_exits) },
	{ "break_inst", VCPU_STAT(break_inst_exits) },
	{ "flush_dcache", VCPU_STAT(flush_dcache_exits) },
	{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
	{NULL}
};

static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
{
	int i;
	for_each_possible_cpu(i) {
		vcpu->arch.guest_kernel_asid[i] = 0;
		vcpu->arch.guest_user_asid[i] = 0;
	}
	return 0;
}

gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{
	return gfn;
}

/* XXXKYMA: We are simulatoring a processor that has the WII bit set in Config7, so we
 * are "runnable" if interrupts are pending
 */
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
	return !!(vcpu->arch.pending_exceptions);
}

int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	return 1;
}

int kvm_arch_hardware_enable(void *garbage)
{
	return 0;
}

void kvm_arch_hardware_disable(void *garbage)
{
}

int kvm_arch_hardware_setup(void)
{
	return 0;
}

void kvm_arch_hardware_unsetup(void)
{
}

void kvm_arch_check_processor_compat(void *rtn)
{
	int *r = (int *)rtn;
	*r = 0;
	return;
}

static void kvm_mips_init_tlbs(struct kvm *kvm)
{
	unsigned long wired;

	/* Add a wired entry to the TLB, it is used to map the commpage to the Guest kernel */
	wired = read_c0_wired();
	write_c0_wired(wired + 1);
	mtc0_tlbw_hazard();
	kvm->arch.commpage_tlb = wired;