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 <linux/gfp.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>

#include "trace.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

void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
#ifdef CONFIG_PPC_BOOK3S_64
	memcpy(to_svcpu(vcpu)->slb, to_book3s(vcpu)->slb_shadow, sizeof(to_svcpu(vcpu)->slb));
	memcpy(&get_paca()->shadow_vcpu, to_book3s(vcpu)->shadow_vcpu,
	       sizeof(get_paca()->shadow_vcpu));
	to_svcpu(vcpu)->slb_max = to_book3s(vcpu)->slb_shadow_max;
#endif

#ifdef CONFIG_PPC_BOOK3S_32
	current->thread.kvm_shadow_vcpu = to_book3s(vcpu)->shadow_vcpu;
#endif
}

void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_PPC_BOOK3S_64
	memcpy(to_book3s(vcpu)->slb_shadow, to_svcpu(vcpu)->slb, sizeof(to_svcpu(vcpu)->slb));
	memcpy(to_book3s(vcpu)->shadow_vcpu, &get_paca()->shadow_vcpu,
	       sizeof(get_paca()->shadow_vcpu));
	to_book3s(vcpu)->slb_shadow_max = to_svcpu(vcpu)->slb_max;
#endif

	kvmppc_giveup_ext(vcpu, MSR_FP);
	kvmppc_giveup_ext(vcpu, MSR_VEC);
	kvmppc_giveup_ext(vcpu, MSR_VSX);
}

static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
{
	ulong smsr = vcpu->arch.shared->msr;

	/* Guest MSR values */
	smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_DE;
	/* Process MSR values */
	smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
	/* External providers the guest reserved */
	smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
	/* 64-bit Process MSR values */
#ifdef CONFIG_PPC_BOOK3S_64
	smsr |= MSR_ISF | MSR_HV;
#endif
	vcpu->arch.shadow_msr = smsr;
}

void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
{
	ulong old_msr = vcpu->arch.shared->msr;

#ifdef EXIT_DEBUG
	printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
#endif

	msr &= to_book3s(vcpu)->msr_mask;
	vcpu->arch.shared->msr = msr;
	kvmppc_recalc_shadow_msr(vcpu);

	if (msr & MSR_POW) {
		if (!vcpu->arch.pending_exceptions) {
			kvm_vcpu_block(vcpu);
			vcpu->stat.halt_wakeup++;

			/* Unset POW bit after we woke up */
			msr &= ~MSR_POW;
			vcpu->arch.shared->msr = msr;
		}
	}

	if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
		   (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
		kvmppc_mmu_flush_segments(vcpu);
		kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));

		/* Preload magic page segment when in kernel mode */
		if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
			struct kvm_vcpu_arch *a = &vcpu->arch;

			if (msr & MSR_DR)
				kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
			else
				kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
		}
	}

	/* Preload FPU if it's enabled */
	<