path: root/arch/powerpc/kvm/book3s_pr.c

/*
 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *    Alexander Graf <agraf@suse.de>
 *    Kevin Wolf <mail@kevin-wolf.de>
 *    Paul Mackerras <paulus@samba.org>
 *
 * Description:
 * Functions relating to running KVM on Book 3S processors where
 * we don't have access to hypervisor mode, and we run the guest
 * in problem state (user mode).
 *
 * This file is derived from arch/powerpc/kvm/44x.c,
 * by Hollis Blanchard <hollisb@us.ibm.com>.
 *
 * 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/export.h>
#include <linux/err.h>
#include <linux/slab.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/switch_to.h>
#include <asm/firmware.h>
#include <asm/hvcall.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <linux/miscdevice.h>

#include "book3s.h"

#define CREATE_TRACE_POINTS
#include "trace_pr.h"

/* #define EXIT_DEBUG */
/* #define DEBUG_EXT */

static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
			     ulong msr);

/* Some compatibility defines */
#ifdef CONFIG_PPC_BOOK3S_32
#define MSR_USER32 MSR_USER
#define MSR_USER64 MSR_USER
#define HW_PAGE_SIZE PAGE_SIZE
#endif

static void kvmppc_core_vcpu_load_pr(struct kvm_vcpu *vcpu, int cpu)
{
#ifdef CONFIG_PPC_BOOK3S_64
	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
	memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb));
	svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
	svcpu_put(svcpu);
#endif
	vcpu->cpu = smp_processor_id();
#ifdef CONFIG_PPC_BOOK3S_32
	current->thread.kvm_shadow_vcpu = vcpu->arch.shadow_vcpu;
#endif
}

static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_PPC_BOOK3S_64
	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
	memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
	to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
	svcpu_put(svcpu);
#endif

	kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
	vcpu->cpu = -1;
}

/* Copy data needed by real-mode code from vcpu to shadow vcpu */
void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,
			  struct kvm_vcpu *vcpu)
{
	svcpu->gpr[0] = vcpu->arch.gpr[0];
	svcpu->gpr[1] = vcpu->arch.gpr[1];
	svcpu->gpr[2] = vcpu->arch.gpr[2];
	svcpu->gpr[3] = vcpu->arch.gpr[3];
	svcpu->gpr[4] = vcpu->arch.gpr[4];
	svcpu->gpr[5] = vcpu->arch.gpr[5];
	svcpu->gpr[6] = vcpu->arch.gpr[6];
	svcpu->gpr[7] = vcpu->arch.gpr[7];
	svcpu->gpr[8] = vcpu->arch.gpr[8];
	svcpu->gpr[9] = vcpu->arch.gpr[9];
	svcpu->gpr[10] = vcpu->arch.gpr[10];
	svcpu->gpr[11] = vcpu->arch.gpr[11];
	svcpu->gpr[12] = vcpu->arch.gpr[12];
	svcpu->gpr[13] = vcpu->arch.gpr[13];
	svcpu->cr  = vcpu->arch.cr;
	svcpu->xer = vcpu->arch.xer;
	svcpu->ctr = vcpu->arch.ctr;
	svcpu->lr  = vcpu->arch.lr;
	svcpu->pc  = vcpu->arch.pc;
}

/* Copy data touched by real-mode code from shadow vcpu back to vcpu */
void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,
			    struct kvmppc_book3s_shadow_vcpu *svcpu)
{
	vcpu->arch.gpr[0] = svcpu->gpr[0];
	vcpu->arch.gpr[1] = svcpu->gpr[1];
	vcpu->arch.gpr[2] = svcpu->gpr[2];
	vcpu->arch.gpr[3] = svcpu->gpr[3];
	vcpu->arch.gpr[4] = svcpu->gpr[4];
	vcpu->arch.gpr[5] = svcpu->gpr[5];
	vcpu->arch.gpr[6] = svcpu->gpr[6];
	vcpu->arch.gpr[7] = svcpu->gpr[7];
	vcpu->arch.gpr[8] = svcpu->gpr[8];
	vcpu->arch.gpr[9] = svcpu->gpr[9];
	vcpu->arch.gpr[10] = svcpu->gpr[10];
	vcpu->arch.gpr[11] = svcpu->gpr[11];
	vcpu->arch.gpr[12] = svcpu->gpr[12];
	vcpu->arch.gpr[13] = svcpu->gpr[13];
	vcpu->arch.cr  = svcpu->cr;
	vcpu->arch.xer = svcpu->xer;
	vcpu->arch.ctr = svcpu->ctr;
	vcpu->arch.lr  = svcpu->lr;
	vcpu->arch.pc  = svcpu->pc;
	vcpu->arch.shadow_srr1 = svcpu->shadow_srr1;
	vcpu->arch.fault_dar   = svcpu->fault_dar;
	vcpu->arch.fault_dsisr = svcpu->fault_dsisr;
	vcpu->arch.last_inst   = svcpu->last_inst;
}

static int kvmppc_core_check_requests_pr(struct kvm_vcpu *vcpu)
{
	int r = 1; /* Indicate we want to get back into the guest */

	/* We misuse TLB_FLUSH to indicate that we want to clear
	   all shadow cache entries */
	if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
		kvmppc_mmu_pte_flush(vcpu, 0, 0);

	return r;
}

/************* MMU Notifiers *************/
static void do_kvm_unmap_hva(struct kvm *kvm, unsigned long start,
			     unsigned long end)
{
	long i;
	struct kvm_vcpu *vcpu;
	struct kvm_memslots *slots;
	struct kvm_memory_sl