path: root/arch/powerpc/kvm/book3s_emulate.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * Copyright SUSE Linux Products GmbH 2009
 *
 * Authors: Alexander Graf <agraf@suse.de>
 */

#include <asm/kvm_ppc.h>
#include <asm/disassemble.h>
#include <asm/kvm_book3s.h>
#include <asm/reg.h>
#include <asm/switch_to.h>
#include <asm/time.h>
#include <asm/tm.h>
#include "book3s.h"
#include <asm/asm-prototypes.h>

#define OP_19_XOP_RFID		18
#define OP_19_XOP_RFI		50

#define OP_31_XOP_MFMSR		83
#define OP_31_XOP_MTMSR		146
#define OP_31_XOP_MTMSRD	178
#define OP_31_XOP_MTSR		210
#define OP_31_XOP_MTSRIN	242
#define OP_31_XOP_TLBIEL	274
/* Opcode is officially reserved, reuse it as sc 1 when sc 1 doesn't trap */
#define OP_31_XOP_FAKE_SC1	308
#define OP_31_XOP_SLBMTE	402
#define OP_31_XOP_SLBIE		434
#define OP_31_XOP_SLBIA		498
#define OP_31_XOP_MFSR		595
#define OP_31_XOP_MFSRIN	659
#define OP_31_XOP_DCBA		758
#define OP_31_XOP_SLBMFEV	851
#define OP_31_XOP_EIOIO		854
#define OP_31_XOP_SLBMFEE	915
#define OP_31_XOP_SLBFEE	979

#define OP_31_XOP_TBEGIN	654
#define OP_31_XOP_TABORT	910

#define OP_31_XOP_TRECLAIM	942
#define OP_31_XOP_TRCHKPT	1006

/* DCBZ is actually 1014, but we patch it to 1010 so we get a trap */
#define OP_31_XOP_DCBZ		1010

#define OP_LFS			48
#define OP_LFD			50
#define OP_STFS			52
#define OP_STFD			54

#define SPRN_GQR0		912
#define SPRN_GQR1		913
#define SPRN_GQR2		914
#define SPRN_GQR3		915
#define SPRN_GQR4		916
#define SPRN_GQR5		917
#define SPRN_GQR6		918
#define SPRN_GQR7		919

enum priv_level {
	PRIV_PROBLEM = 0,
	PRIV_SUPER = 1,
	PRIV_HYPER = 2,
};

static bool spr_allowed(struct kvm_vcpu *vcpu, enum priv_level level)
{
	/* PAPR VMs only access supervisor SPRs */
	if (vcpu->arch.papr_enabled && (level > PRIV_SUPER))
		return false;

	/* Limit user space to its own small SPR set */
	if ((kvmppc_get_msr(vcpu) & MSR_PR) && level > PRIV_PROBLEM)
		return false;

	return true;
}

#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
static inline void kvmppc_copyto_vcpu_tm(struct kvm_vcpu *vcpu)
{
	memcpy(&vcpu->arch.gpr_tm[0], &vcpu->arch.regs.gpr[0],
			sizeof(vcpu->arch.gpr_tm));
	memcpy(&vcpu->arch.fp_tm, &vcpu->arch.fp,
			sizeof(struct thread_fp_state));
	memcpy(&vcpu->arch.vr_tm, &vcpu->arch.vr,
			sizeof(struct thread_vr_state));
	vcpu->arch.ppr_tm = vcpu->arch.ppr;
	vcpu->arch.dscr_tm = vcpu->arch.dscr;
	vcpu->arch.amr_tm = vcpu->arch.amr;
	vcpu->arch.ctr_tm = vcpu->arch.regs.ctr;
	vcpu->arch.tar_tm = vcpu->arch.tar;
	vcpu->arch.lr_tm = vcpu->arch.regs.link;
	vcpu->arch.cr_tm = vcpu->arch.regs.ccr;
	vcpu->arch.xer_tm = vcpu->arch.regs.xer;
	vcpu->arch.vrsave_tm = vcpu->arch.vrsave;
}

static inline void kvmppc_copyfrom_vcpu_tm(struct kvm_vcpu *vcpu)
{
	memcpy(&vcpu->arch.regs.gpr[0], &vcpu->arch.gpr_tm[0],
			sizeof(vcpu->arch.regs.gpr));
	memcpy(&vcpu->arch.fp, &vcpu->arch.fp_tm,
			sizeof(struct thread_fp_state));
	memcpy(&vcpu->arch.vr, &vcpu->arch.vr_tm,
			sizeof(struct thread_vr_state));
	vcpu->arch.ppr = vcpu->arch.ppr_tm;
	vcpu->arch.dscr = vcpu->arch.dscr_tm;
	vcpu->arch.amr = vcpu->arch.amr_tm;
	vcpu->arch.regs.ctr = vcpu->arch.ctr_tm;
	vcpu->arch.tar = vcpu->arch.tar_tm;
	vcpu->arch.regs.link = vcpu->arch.lr_tm;
	vcpu->arch.regs.ccr = vcpu->arch.cr_tm;
	vcpu->arch.regs.xer = vcpu->arch.xer_tm;
	vcpu->arch.vrsave = vcpu->arch.vrsave_tm;
}

static void kvmppc_emulate_treclaim(struct kvm_vcpu *vcpu, int ra_val)
{
	unsigned long guest_msr = kvmppc_get_msr(vcpu);
	int fc_val = ra_val ? ra_val : 1;
	uint64_t texasr;

	/* CR0 = 0 | MSR[TS] | 0 */
	vcpu->arch.regs.ccr = (vcpu->arch.regs.ccr & ~(CR0_MASK << CR0_SHIFT)) |
		(((guest_msr & MSR_TS_MASK) >> (MSR_TS_S_LG - 1))
		 << CR0_SHIFT);

	preempt_disable();
	tm_enable();
	texasr = mfspr(SPRN_TEXASR);
	kvmppc_save_tm_pr(vcpu);
	kvmppc_copyfrom_vcpu_tm(vcpu);

	/* failure recording depends on Failure Summary bit */
	if (!(texasr & TEXASR_FS)) {
		texasr &= ~TEXASR_FC;
		texasr |= ((u64)fc_val << TEXASR_FC_LG) | TEXASR_FS;

		texasr &= ~(TEXASR_PR | TEXASR_HV);
		if (kvmppc_get_msr(vcpu) & MSR_PR)
			texasr |= TEXASR_PR;

		if (kvmppc_get_msr(vcpu) & MSR_HV)
			texasr |= TEXASR_HV;

		vcpu->arch