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Commit 4ab96919 authored by Alexander Graf's avatar Alexander Graf Committed by Avi Kivity
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KVM: PPC: e500mc: Add doorbell emulation support 



When one vcpu wants to kick another, it can issue a special IPI instruction
called msgsnd. This patch emulates this instruction, its clearing counterpart
and the infrastructure required to actually trigger that interrupt inside
a guest vcpu.

With this patch, SMP guests on e500mc work.

Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 73196cd3

arch/powerpc/include/asm/dbell.h

+2 −0
Original line number Diff line number Diff line
@@ -19,7 +19,9 @@ 


#define PPC_DBELL_MSG_BRDCAST	(0x04000000)

#define PPC_DBELL_TYPE(x)	(((x) & 0xf) << (63-36))

#define PPC_DBELL_TYPE_MASK	PPC_DBELL_TYPE(0xf)

#define PPC_DBELL_LPID(x)	((x) << (63 - 49))

#define PPC_DBELL_PIR_MASK	0x3fff

enum ppc_dbell {

	PPC_DBELL = 0,		/* doorbell */

	PPC_DBELL_CRIT = 1,	/* critical doorbell */

arch/powerpc/kvm/booke.c

+2 −0
Original line number Diff line number Diff line
@@ -326,6 +326,7 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, 
		int_class = INT_CLASS_NONCRIT;

		break;

	case BOOKE_IRQPRIO_CRITICAL:

	case BOOKE_IRQPRIO_DBELL_CRIT:

		allowed = vcpu->arch.shared->msr & MSR_CE;

		allowed = allowed && !crit;

		msr_mask = MSR_GS | MSR_ME;
@@ -342,6 +343,7 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu, 
		keep_irq = true;

		/* fall through */

	case BOOKE_IRQPRIO_EXTERNAL:

	case BOOKE_IRQPRIO_DBELL:

		allowed = vcpu->arch.shared->msr & MSR_EE;

		allowed = allowed && !crit;

		msr_mask = MSR_GS | MSR_CE | MSR_ME | MSR_DE;

arch/powerpc/kvm/e500_emulate.c

+68 −0
Original line number Diff line number Diff line
@@ -14,16 +14,74 @@ 


#include <asm/kvm_ppc.h>

#include <asm/disassemble.h>

#include <asm/dbell.h>



#include "booke.h"

#include "e500.h"



#define XOP_MSGSND  206

#define XOP_MSGCLR  238

#define XOP_TLBIVAX 786

#define XOP_TLBSX   914

#define XOP_TLBRE   946

#define XOP_TLBWE   978

#define XOP_TLBILX  18



#ifdef CONFIG_KVM_E500MC

static int dbell2prio(ulong param)

{

	int msg = param & PPC_DBELL_TYPE_MASK;

	int prio = -1;



	switch (msg) {

	case PPC_DBELL_TYPE(PPC_DBELL):

		prio = BOOKE_IRQPRIO_DBELL;

		break;

	case PPC_DBELL_TYPE(PPC_DBELL_CRIT):

		prio = BOOKE_IRQPRIO_DBELL_CRIT;

		break;

	default:

		break;

	}



	return prio;

}



static int kvmppc_e500_emul_msgclr(struct kvm_vcpu *vcpu, int rb)

{

	ulong param = vcpu->arch.gpr[rb];

	int prio = dbell2prio(param);



	if (prio < 0)

		return EMULATE_FAIL;



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

	return EMULATE_DONE;

}



static int kvmppc_e500_emul_msgsnd(struct kvm_vcpu *vcpu, int rb)

{

	ulong param = vcpu->arch.gpr[rb];

	int prio = dbell2prio(rb);

	int pir = param & PPC_DBELL_PIR_MASK;

	int i;

	struct kvm_vcpu *cvcpu;



	if (prio < 0)

		return EMULATE_FAIL;



	kvm_for_each_vcpu(i, cvcpu, vcpu->kvm) {

		int cpir = cvcpu->arch.shared->pir;

		if ((param & PPC_DBELL_MSG_BRDCAST) || (cpir == pir)) {

			set_bit(prio, &cvcpu->arch.pending_exceptions);

			kvm_vcpu_kick(cvcpu);

		}

	}



	return EMULATE_DONE;

}

#endif



int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,

                           unsigned int inst, int *advance)

{
@@ -36,6 +94,16 @@ int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu, 
	case 31:

		switch (get_xop(inst)) {



#ifdef CONFIG_KVM_E500MC

		case XOP_MSGSND:

			emulated = kvmppc_e500_emul_msgsnd(vcpu, get_rb(inst));

			break;



		case XOP_MSGCLR:

			emulated = kvmppc_e500_emul_msgclr(vcpu, get_rb(inst));

			break;

#endif



		case XOP_TLBRE:

			emulated = kvmppc_e500_emul_tlbre(vcpu);

			break;