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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: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2012-02-15 13:28:48 +00:00 committed by Avi Kivity
parent 73196cd364
commit 4ab969199e
3 changed files with 72 additions and 0 deletions
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2
arch/powerpc/include/asm/dbell.h
View File

@ -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 */

2
arch/powerpc/kvm/booke.c
View File

@ -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;

68
arch/powerpc/kvm/e500_emulate.c
View File

@ -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;