Release 4.14 arch/powerpc/kvm/book3s.c

/*
 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *    Alexander Graf <agraf@suse.de>
 *    Kevin Wolf <mail@kevin-wolf.de>
 *
 * Description:
 * 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/err.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>

#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <linux/uaccess.h>
#include <asm/io.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu_context.h>
#include <asm/page.h>
#include <asm/xive.h>

#include "book3s.h"
#include "trace.h"


#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU

/* #define EXIT_DEBUG */


struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ "exits",       VCPU_STAT(sum_exits) },
	{ "mmio",        VCPU_STAT(mmio_exits) },
	{ "sig",         VCPU_STAT(signal_exits) },
	{ "sysc",        VCPU_STAT(syscall_exits) },
	{ "inst_emu",    VCPU_STAT(emulated_inst_exits) },
	{ "dec",         VCPU_STAT(dec_exits) },
	{ "ext_intr",    VCPU_STAT(ext_intr_exits) },
	{ "queue_intr",  VCPU_STAT(queue_intr) },
	{ "halt_poll_success_ns",	VCPU_STAT(halt_poll_success_ns) },
	{ "halt_poll_fail_ns",		VCPU_STAT(halt_poll_fail_ns) },
	{ "halt_wait_ns",		VCPU_STAT(halt_wait_ns) },
	{ "halt_successful_poll", VCPU_STAT(halt_successful_poll), },
	{ "halt_attempted_poll", VCPU_STAT(halt_attempted_poll), },
	{ "halt_successful_wait",	VCPU_STAT(halt_successful_wait) },
	{ "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
	{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
	{ "pf_storage",  VCPU_STAT(pf_storage) },
	{ "sp_storage",  VCPU_STAT(sp_storage) },
	{ "pf_instruc",  VCPU_STAT(pf_instruc) },
	{ "sp_instruc",  VCPU_STAT(sp_instruc) },
	{ "ld",          VCPU_STAT(ld) },
	{ "ld_slow",     VCPU_STAT(ld_slow) },
	{ "st",          VCPU_STAT(st) },
	{ "st_slow",     VCPU_STAT(st_slow) },
	{ "pthru_all",       VCPU_STAT(pthru_all) },
	{ "pthru_host",      VCPU_STAT(pthru_host) },
	{ "pthru_bad_aff",   VCPU_STAT(pthru_bad_aff) },
	{ NULL }
};



void kvmppc_unfixup_split_real(struct kvm_vcpu *vcpu)
{
	if (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK) {
		ulong pc = kvmppc_get_pc(vcpu);
		if ((pc & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS)
			kvmppc_set_pc(vcpu, pc & ~SPLIT_HACK_MASK);
		vcpu->arch.hflags &= ~BOOK3S_HFLAG_SPLIT_HACK;
	}
}
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EXPORT_SYMBOL_GPL(kvmppc_unfixup_split_real);



static inline unsigned long kvmppc_interrupt_offset(struct kvm_vcpu *vcpu)
{
	if (!is_kvmppc_hv_enabled(vcpu->kvm))
		return to_book3s(vcpu)->hior;
	return 0;
}

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static inline void kvmppc_update_int_pending(struct kvm_vcpu *vcpu,
			unsigned long pending_now, unsigned long old_pending)
{
	if (is_kvmppc_hv_enabled(vcpu->kvm))
		return;
	if (pending_now)
		kvmppc_set_int_pending(vcpu, 1);
	else if (old_pending)
		kvmppc_set_int_pending(vcpu, 0);
}

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static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu)
{
	ulong crit_raw;
	ulong crit_r1;
	bool crit;

	if (is_kvmppc_hv_enabled(vcpu->kvm))
		return false;

	crit_raw = kvmppc_get_critical(vcpu);
	crit_r1 = kvmppc_get_gpr(vcpu, 1);

	/* Truncate crit indicators in 32 bit mode */
	if (!(kvmppc_get_msr(vcpu) & MSR_SF)) {
		crit_raw &= 0xffffffff;
		crit_r1 &= 0xffffffff;
	}

	/* Critical section when crit == r1 */
	crit = (crit_raw == crit_r1);
	/* ... and we're in supervisor mode */
	crit = crit && !(kvmppc_get_msr(vcpu) & MSR_PR);

	return crit;
}

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void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags)
{
	kvmppc_unfixup_split_real(vcpu);
	kvmppc_set_srr0(vcpu, kvmppc_get_pc(vcpu));
	kvmppc_set_srr1(vcpu, kvmppc_get_msr(vcpu) | flags);
	kvmppc_set_pc(vcpu, kvmppc_interrupt_offset(vcpu) + vec);
	vcpu->arch.mmu.reset_msr(vcpu);
}

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static int kvmppc_book3s_vec2irqprio(unsigned int vec)
{
	unsigned int prio;

	switch (vec) {
	case 0x100: prio = BOOK3S_IRQPRIO_SYSTEM_RESET;		break;
	case 0x200: prio = BOOK3S_IRQPRIO_MACHINE_CHECK;	break;
	case 0x300: prio = BOOK3S_IRQPRIO_DATA_STORAGE;		break;
	case 0x380: prio = BOOK3S_IRQPRIO_DATA_SEGMENT;		break;
	case 0x400: prio = BOOK3S_IRQPRIO_INST_STORAGE;		break;
	case 0x480: prio = BOOK3S_IRQPRIO_INST_SEGMENT;		break;
	case 0x500: prio = BOOK3S_IRQPRIO_EXTERNAL;		break;
	case 0x501: prio = BOOK3S_IRQPRIO_EXTERNAL_LEVEL;	break;
	case 0x600: prio = BOOK3S_IRQPRIO_ALIGNMENT;		break;
	case 0x700: prio = BOOK3S_IRQPRIO_PROGRAM;		break;
	case 0x800: prio = BOOK3S_IRQPRIO_FP_UNAVAIL;		break;
	case 0x900: prio = BOOK3S_IRQPRIO_DECREMENTER;		break;
	case 0xc00: prio = BOOK3S_IRQPRIO_SYSCALL;		break;
	case 0xd00: prio = BOOK3S_IRQPRIO_DEBUG;		break;
	case 0xf20: prio = BOOK3S_IRQPRIO_ALTIVEC;		break;
	case 0xf40: prio = BOOK3S_IRQPRIO_VSX;			break;
	case 0xf60: prio = BOOK3S_IRQPRIO_FAC_UNAVAIL;		break;
	default:    prio = BOOK3S_IRQPRIO_MAX;			break;
	}

	return prio;
}

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void kvmppc_book3s_dequeue_irqprio(struct kvm_vcpu *vcpu,
					  unsigned int vec)
{
	unsigned long old_pending = vcpu->arch.pending_exceptions;

	clear_bit(kvmppc_book3s_vec2irqprio(vec),
		  &vcpu->arch.pending_exceptions);

	kvmppc_update_int_pending(vcpu, vcpu->arch.pending_exceptions,
				  old_pending);
}

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void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec)
{
	vcpu->stat.queue_intr++;

	set_bit(kvmppc_book3s_vec2irqprio(vec),
		&vcpu->arch.pending_exceptions);
#ifdef EXIT_DEBUG
	printk(KERN_INFO "Queueing interrupt %x\n", vec);
#endif
}
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EXPORT_SYMBOL_GPL(kvmppc_book3s_queue_irqprio);



void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong flags)
{
	/* might as well deliver this straight away */
	kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_PROGRAM, flags);
}
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EXPORT_SYMBOL_GPL(kvmppc_core_queue_program);



void kvmppc_core_queue_fpunavail(struct kvm_vcpu *vcpu)
{
	/* might as well deliver this straight away */
	kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, 0);
}

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void kvmppc_core_queue_vec_unavail(struct kvm_vcpu *vcpu)
{
	/* might as well deliver this straight away */
	kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_ALTIVEC, 0);
}

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void kvmppc_core_queue_vsx_unavail(struct kvm_vcpu *vcpu)
{
	/* might as well deliver this straight away */
	kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_VSX, 0);
}

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void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
{
	kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_DECREMENTER);
}
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EXPORT_SYMBOL_GPL(kvmppc_core_queue_dec);



int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
{
	return test_bit(BOOK3S_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
}
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EXPORT_SYMBOL_GPL(kvmppc_core_pending_dec);



void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
{
	kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_DECREMENTER);
}
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EXPORT_SYMBOL_GPL(kvmppc_core_dequeue_dec);



void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
                                struct kvm_interrupt *irq)
{
	unsigned int vec = BOOK3S_INTERRUPT_EXTERNAL;

	if (irq->irq == KVM_INTERRUPT_SET_LEVEL)
		vec = BOOK3S_INTERRUPT_EXTERNAL_LEVEL;

	kvmppc_book3s_queue_irqprio(vcpu, vec);
}

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void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu)
{
	kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL);
	kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
}

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void kvmppc_core_queue_data_storage(struct kvm_vcpu *vcpu, ulong dar,
				    ulong flags)
{
	kvmppc_set_dar(vcpu, dar);
	kvmppc_set_dsisr(vcpu, flags);
	kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE);
}
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EXPORT_SYMBOL_GPL(kvmppc_core_queue_data_storage);	
/* used by kvm_hv */



void kvmppc_core_queue_inst_storage(struct kvm_vcpu *vcpu, ulong flags)
{
	u64 msr = kvmppc_get_msr(vcpu);
	msr &= ~(SRR1_ISI_NOPT | SRR1_ISI_N_OR_G | SRR1_ISI_PROT);
	msr |= flags & (SRR1_ISI_NOPT | SRR1_ISI_N_OR_G | SRR1_ISI_PROT);
	kvmppc_set_msr_fast(vcpu, msr);
	kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
}

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static int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu,
					 unsigned int priority)
{
	int deliver = 1;
	int vec = 0;
	bool crit = kvmppc_critical_section(vcpu);

	switch (priority) {
	case BOOK3S_IRQPRIO_DECREMENTER:
		deliver = (kvmppc_get_msr(vcpu) & MSR_EE) && !crit;
		vec = BOOK3S_INTERRUPT_DECREMENTER;
		break;
	case BOOK3S_IRQPRIO_EXTERNAL:
	case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
		deliver = (kvmppc_get_msr(vcpu) & MSR_EE) && !crit;
		vec = BOOK3S_INTERRUPT_EXTERNAL;
		break;
	case BOOK3S_IRQPRIO_SYSTEM_RESET:
		vec = BOOK3S_INTERRUPT_SYSTEM_RESET;
		break;
	case BOOK3S_IRQPRIO_MACHINE_CHECK:
		vec = BOOK3S_INTERRUPT_MACHINE_CHECK;
		break;
	case BOOK3S_IRQPRIO_DATA_STORAGE:
		vec = BOOK3S_INTERRUPT_DATA_STORAGE;
		break;
	case BOOK3S_IRQPRIO_INST_STORAGE:
		vec = BOOK3S_INTERRUPT_INST_STORAGE;
		break;
	case BOOK3S_IRQPRIO_DATA_SEGMENT:
		vec = BOOK3S_INTERRUPT_DATA_SEGMENT;
		break;
	case BOOK3S_IRQPRIO_INST_SEGMENT:
		vec = BOOK3S_INTERRUPT_INST_SEGMENT;
		break;
	case BOOK3S_IRQPRIO_ALIGNMENT:
		vec = BOOK3S_INTERRUPT_ALIGNMENT;
		break;
	case BOOK3S_IRQPRIO_PROGRAM:
		vec = BOOK3S_INTERRUPT_PROGRAM;
		break;
	case BOOK3S_IRQPRIO_VSX:
		vec = BOOK3S_INTERRUPT_VSX;
		break;
	case BOOK3S_IRQPRIO_ALTIVEC:
		vec = BOOK3S_INTERRUPT_ALTIVEC;
		break;
	case BOOK3S_IRQPRIO_FP_UNAVAIL:
		vec = BOOK3S_INTERRUPT_FP_UNAVAIL;
		break;
	case BOOK3S_IRQPRIO_SYSCALL:
		vec = BOOK3S_INTERRUPT_SYSCALL;
		break;
	case BOOK3S_IRQPRIO_DEBUG:
		vec = BOOK3S_INTERRUPT_TRACE;
		break;
	case BOOK3S_IRQPRIO_PERFORMANCE_MONITOR:
		vec = BOOK3S_INTERRUPT_PERFMON;
		break;
	case BOOK3S_IRQPRIO_FAC_UNAVAIL:
		vec = BOOK3S_INTERRUPT_FAC_UNAVAIL;
		break;
	default:
		deliver = 0;
		printk(KERN_ERR "KVM: Unknown interrupt: 0x%x\n", priority);
		break;
	}

#if 0
	printk(KERN_INFO "Deliver interrupt 0x%x? %x\n", vec, deliver);
#endif

	if (deliver)
		kvmppc_inject_interrupt(vcpu, vec, 0);

	return deliver;
}

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/*
 * This function determines if an irqprio should be cleared once issued.
 */


static bool clear_irqprio(struct kvm_vcpu *vcpu, unsigned int priority)
{
	switch (priority) {
		case BOOK3S_IRQPRIO_DECREMENTER:
			/* DEC interrupts get cleared by mtdec */
			return false;
		case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
			/* External interrupts get cleared by userspace */
			return false;
	}

	return true;
}

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int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
{
	unsigned long *pending = &vcpu->arch.pending_exceptions;
	unsigned long old_pending = vcpu->arch.pending_exceptions;
	unsigned int priority;

#ifdef EXIT_DEBUG
	if (vcpu->arch.pending_exceptions)
		printk(KERN_EMERG "KVM: Check pending: %lx\n", vcpu->arch.pending_exceptions);
#endif
	priority = __ffs(*pending);
	while (priority < BOOK3S_IRQPRIO_MAX) {
		if (kvmppc_book3s_irqprio_deliver(vcpu, priority) &&
		    clear_irqprio(vcpu, priority)) {
			clear_bit(priority, &vcpu->arch.pending_exceptions);
			break;
		}

		priority = find_next_bit(pending,
					 BITS_PER_BYTE * sizeof(*pending),
					 priority + 1);
	}

	/* Tell the guest about our interrupt status */
	kvmppc_update_int_pending(vcpu, *pending, old_pending);

	return 0;
}
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EXPORT_SYMBOL_GPL(kvmppc_core_prepare_to_enter);



kvm_pfn_t kvmppc_gpa_to_pfn(struct kvm_vcpu *vcpu, gpa_t gpa, bool writing,
			bool *writable)
{
	ulong mp_pa = vcpu->arch.magic_page_pa & KVM_PAM;
	gfn_t gfn = gpa >> PAGE_SHIFT;

	if (!(kvmppc_get_msr(vcpu) & MSR_SF))
		mp_pa = (uint32_t)mp_pa;

	/* Magic page override */
	gpa &= ~0xFFFULL;
	if (unlikely(mp_pa) && unlikely((gpa & KVM_PAM) == mp_pa)) {
		ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK;
		kvm_pfn_t pfn;

		pfn = (kvm_pfn_t)virt_to_phys((void*)shared_page) >> PAGE_SHIFT;
		get_page(pfn_to_page(pfn));
		if (writable)
			*writable = true;
		return pfn;
	}

	return gfn_to_pfn_prot(vcpu->kvm, gfn, writing, writable);
}
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EXPORT_SYMBOL_GPL(kvmppc_gpa_to_pfn);



int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, enum xlate_instdata xlid,
		 enum xlate_readwrite xlrw, struct kvmppc_pte *pte)
{
	bool data = (xlid == XLATE_DATA);
	bool iswrite = (xlrw == XLATE_WRITE);
	int relocated = (kvmppc_get_msr(vcpu) & (data ? MSR_DR : MSR_IR));
	int r;

	if (relocated) {
		r = vcpu->arch.mmu.xlate(vcpu, eaddr, pte, data, iswrite);
	} else {
		pte->eaddr = eaddr;
		pte->raddr = eaddr & KVM_PAM;
		pte->vpage = VSID_REAL | eaddr >> 12;
		pte->may_read = true;
		pte->may_write = true;
		pte->may_execute = true;
		r = 0;

		if ((kvmppc_get_msr(vcpu) & (MSR_IR | MSR_DR)) == MSR_DR &&
		    !data) {
			if ((vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK) &&
			    ((eaddr & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS))
			pte->raddr &= ~SPLIT_HACK_MASK;
		}
	}

	return r;
}

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125
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70
35.90%
2
22.22%
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195
100.00%
9
100.00%



int kvmppc_load_last_inst(struct kvm_vcpu *vcpu, enum instruction_type type,
					 u32 *inst)
{
	ulong pc = kvmppc_get_pc(vcpu);
	int r;

	if (type == INST_SC)
		pc -= 4;

	r = kvmppc_ld(vcpu, &pc, sizeof(u32), inst, false);
	if (r == EMULATE_DONE)
		return r;
	else
		return EMULATE_AGAIN;
}
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1
100.00%


EXPORT_SYMBOL_GPL(kvmppc_load_last_inst);



int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
	return 0;
}

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Alexander Graf
11
84.62%
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2
15.38%
1
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13
100.00%
2
100.00%



int kvmppc_subarch_vcpu_init(struct kvm_vcpu *vcpu)
{
	return 0;
}

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Bharat Bhushan
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13
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void kvmppc_subarch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
}

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int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
	return vcpu->kvm->arch.kvm_ops->get_sregs(vcpu, sregs);
}

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31
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int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
	return vcpu->kvm->arch.kvm_ops->set_sregs(vcpu, sregs);
}

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int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	int i;

	regs->pc = kvmppc_get_pc(vcpu);
	regs->cr = kvmppc_get_cr(vcpu);
	regs->ctr = kvmppc_get_ctr(vcpu);
	regs->lr = kvmppc_get_lr(vcpu);
	regs->xer = kvmppc_get_xer(vcpu);
	regs->msr = kvmppc_get_msr(vcpu);
	regs->srr0 = kvmppc_get_srr0(vcpu);
	regs->srr1 = kvmppc_get_srr1(vcpu);
	regs->pid = vcpu->arch.pid;
	regs->sprg0 = kvmppc_get_sprg0(vcpu);
	regs->sprg1 = kvmppc_get_sprg1(vcpu);
	regs->sprg2 = kvmppc_get_sprg2(vcpu);
	regs->sprg3 = kvmppc_get_sprg3(vcpu);
	regs->sprg4 = kvmppc_get_sprg4(vcpu);
	regs->sprg5 = kvmppc_get_sprg5(vcpu);
	regs->sprg6 = kvmppc_get_sprg6(vcpu);
	regs->sprg7 = kvmppc_get_sprg7(vcpu);

	for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
		regs->gpr[i] = kvmppc_get_gpr(vcpu, i);

	return 0;
}

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75
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4
80.00%
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207
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5
100.00%



int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	int i;

	kvmppc_set_pc(vcpu, regs->pc);
	kvmppc_set_cr(vcpu, regs->cr);
	kvmppc_set_ctr(vcpu, regs->ctr);
	kvmppc_set_lr(vcpu, regs->lr);
	kvmppc_set_xer(vcpu, regs->xer);
	kvmppc_set_msr(vcpu, regs->msr);
	kvmppc_set_srr0(vcpu, regs->srr0);
	kvmppc_set_srr1(vcpu, regs->srr1);
	kvmppc_set_sprg0(vcpu, regs->sprg0);
	kvmppc_set_sprg1(vcpu, regs->sprg1);
	kvmppc_set_sprg2(vcpu, regs->sprg2);
	kvmppc_set_sprg3(vcpu, regs->sprg3);
	kvmppc_set_sprg4(vcpu, regs->sprg4);
	kvmppc_set_sprg5(vcpu, regs->sprg5);
	kvmppc_set_sprg6(vcpu, regs->sprg6);
	kvmppc_set_sprg7(vcpu, regs->sprg7);

	for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
		kvmppc_set_gpr(vcpu, i, regs->gpr[i]);

	return 0;
}

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94
47.72%
2
25.00%
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197
100.00%
8
100.00%



int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	return -ENOTSUPP;
}

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12
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7
36.84%
2
66.67%
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19
100.00%
3
100.00%



int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	return -ENOTSUPP;
}

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4
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2
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19
100.00%
3
100.00%



int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id,
			union kvmppc_one_reg *val)
{
	int r = 0;
	long int i;

	r = vcpu->kvm->arch.kvm_ops->get_one_reg(vcpu, id, val);
	if (r == -EINVAL) {
		r = 0;
		switch (id) {
		case KVM_REG_PPC_DAR:
			*val = get_reg_val(id, kvmppc_get_dar(vcpu));
			break;
		case KVM_REG_PPC_DSISR:
			*val = get_reg_val(id, kvmppc_get_dsisr(vcpu));
			break;
		case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
			i = id - KVM_REG_PPC_FPR0;
			*val = get_reg_val(id, VCPU_FPR(vcpu, i));
			break;
		case KVM_REG_PPC_FPSCR:
			*val = get_reg_val(id, vcpu->arch.fp.fpscr);
			break;
#ifdef CONFIG_VSX
		case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31:
			if (cpu_has_feature(CPU_FTR_VSX)) {
				i = id - KVM_REG_PPC_VSR0;
				val->vsxval[0] = vcpu->arch.fp.fpr[i][0];
				val->vsxval[1] = vcpu->arch.fp.fpr[i][1];
			} else {
				r = -ENXIO;
			}
			break;
#endif /* CONFIG_VSX */
		case KVM_REG_PPC_DEBUG_INST:
			*val = get_reg_val(id, INS_TW);
			break;
#ifdef CONFIG_KVM_XICS
		case KVM_REG_PPC_ICP_STATE:
			if (!vcpu->arch.icp && !vcpu->arch.xive_vcpu) {
				r = -ENXIO;
				break;
			}
			if (xive_enabled())
				*val = get_reg_val(id, kvmppc_xive_get_icp(vcpu));
			else
				*val = get_reg_val(id, kvmppc_xics_get_icp(vcpu));
			break;
#endif /* CONFIG_KVM_XICS */
		case KVM_REG_PPC_FSCR:
			*val = get_reg_val(id, vcpu->arch.