Commit 513579e3 authored by Alexander Graf's avatar Alexander Graf Committed by Benjamin Herrenschmidt
Browse files

Add desktop PowerPC specific emulation 



Little opcodes behave differently on desktop and embedded PowerPC cores.
In order to reflect those differences, let's add some #ifdef code to emulate.c.

We could probably also handle them in the core specific emulation files, but I
would prefer to reuse as much code as possible.

Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 9a7a9b09

arch/powerpc/kvm/emulate.c

+39 −10
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include "trace.h"



#define OP_TRAP 3

#define OP_TRAP_64 2



#define OP_31_XOP_LWZX      23

#define OP_31_XOP_LBZX      87
@@ -64,16 +65,36 @@ 
#define OP_STH  44

#define OP_STHU 45



#ifdef CONFIG_PPC64

static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)

{

	return 1;

}

#else

static int kvmppc_dec_enabled(struct kvm_vcpu *vcpu)

{

	return vcpu->arch.tcr & TCR_DIE;

}

#endif



void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)

{

	unsigned long nr_jiffies;



	if (vcpu->arch.tcr & TCR_DIE) {

#ifdef CONFIG_PPC64

	/* POWER4+ triggers a dec interrupt if the value is < 0 */

	if (vcpu->arch.dec & 0x80000000) {

		del_timer(&vcpu->arch.dec_timer);

		kvmppc_core_queue_dec(vcpu);

		return;

	}

#endif

	if (kvmppc_dec_enabled(vcpu)) {

		/* The decrementer ticks at the same rate as the timebase, so

		 * that's how we convert the guest DEC value to the number of

		 * host ticks. */



		vcpu->arch.dec_jiffies = mftb();

		vcpu->arch.dec_jiffies = get_tb();

		nr_jiffies = vcpu->arch.dec / tb_ticks_per_jiffy;

		mod_timer(&vcpu->arch.dec_timer,

		          get_jiffies_64() + nr_jiffies);
@@ -113,9 +134,15 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) 
	/* this default type might be overwritten by subcategories */

	kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);



	pr_debug(KERN_INFO "Emulating opcode %d / %d\n", get_op(inst), get_xop(inst));



	switch (get_op(inst)) {

	case OP_TRAP:

#ifdef CONFIG_PPC64

	case OP_TRAP_64:

#else

		vcpu->arch.esr |= ESR_PTR;

#endif

		kvmppc_core_queue_program(vcpu);

		advance = 0;

		break;
@@ -190,17 +217,19 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) 
			case SPRN_SRR1:

				vcpu->arch.gpr[rt] = vcpu->arch.srr1; break;

			case SPRN_PVR:

				vcpu->arch.gpr[rt] = mfspr(SPRN_PVR); break;

				vcpu->arch.gpr[rt] = vcpu->arch.pvr; break;

			case SPRN_PIR:

				vcpu->arch.gpr[rt] = mfspr(SPRN_PIR); break;

				vcpu->arch.gpr[rt] = vcpu->vcpu_id; break;

			case SPRN_MSSSR0:

				vcpu->arch.gpr[rt] = 0; break;



			/* Note: mftb and TBRL/TBWL are user-accessible, so

			 * the guest can always access the real TB anyways.

			 * In fact, we probably will never see these traps. */

			case SPRN_TBWL:

				vcpu->arch.gpr[rt] = mftbl(); break;

				vcpu->arch.gpr[rt] = get_tb() >> 32; break;

			case SPRN_TBWU:

				vcpu->arch.gpr[rt] = mftbu(); break;

				vcpu->arch.gpr[rt] = get_tb(); break;



			case SPRN_SPRG0:

				vcpu->arch.gpr[rt] = vcpu->arch.sprg0; break;
@@ -215,11 +244,9 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) 


			case SPRN_DEC:

			{

				u64 jd = mftb() - vcpu->arch.dec_jiffies;

				u64 jd = get_tb() - vcpu->arch.dec_jiffies;

				vcpu->arch.gpr[rt] = vcpu->arch.dec - jd;

#ifdef DEBUG_EMUL

				printk(KERN_INFO "mfDEC: %x - %llx = %lx\n", vcpu->arch.dec, jd, vcpu->arch.gpr[rt]);

#endif

				pr_debug(KERN_INFO "mfDEC: %x - %llx = %lx\n", vcpu->arch.dec, jd, vcpu->arch.gpr[rt]);

				break;

			}

			default:
@@ -271,6 +298,8 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu) 
			case SPRN_TBWL: break;

			case SPRN_TBWU: break;



			case SPRN_MSSSR0: break;



			case SPRN_DEC:

				vcpu->arch.dec = vcpu->arch.gpr[rs];

				kvmppc_emulate_dec(vcpu);

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