KVM: ppc: guest breakpoint support

Allow host userspace to program hardware debug registers to set breakpoints
inside guests.

Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

3 files changed, 108 insertions, 2 deletions

diff --git a/arch/powerpc/kvm/booke_guest.c b/arch/powerpc/kvm/booke_guest.c
index 9c8ad850c6e3..3cca079975e1 100644
--- a/arch/powerpc/kvm/booke_guest.c
+++ b/arch/powerpc/kvm/booke_guest.c
@@ -410,6 +410,21 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
                 break;
         }
 
+        case BOOKE_INTERRUPT_DEBUG: {
+                u32 dbsr;
+
+                vcpu->arch.pc = mfspr(SPRN_CSRR0);
+
+                /* clear IAC events in DBSR register */
+                dbsr = mfspr(SPRN_DBSR);
+                dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4;
+                mtspr(SPRN_DBSR, dbsr);
+
+                run->exit_reason = KVM_EXIT_DEBUG;
+                r = RESUME_HOST;
+                break;
+        }
+
         default:
                 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
                 BUG();
diff --git a/arch/powerpc/kvm/booke_interrupts.S b/arch/powerpc/kvm/booke_interrupts.S
index 3b653b5309b8..8eaba2613ffd 100644
--- a/arch/powerpc/kvm/booke_interrupts.S
+++ b/arch/powerpc/kvm/booke_interrupts.S
@@ -42,7 +42,8 @@
 #define HOST_STACK_LR   (HOST_STACK_SIZE + 4) /* In caller stack frame. */
 
 #define NEED_INST_MASK ((1<<BOOKE_INTERRUPT_PROGRAM) | \
-                        (1<<BOOKE_INTERRUPT_DTLB_MISS))
+                        (1<<BOOKE_INTERRUPT_DTLB_MISS) | \
+                        (1<<BOOKE_INTERRUPT_DEBUG))
 
 #define NEED_DEAR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
                         (1<<BOOKE_INTERRUPT_DTLB_MISS))
@@ -431,6 +432,14 @@ lightweight_exit:
         oris    r3, r3, KVMPPC_MSR_MASK@h
         ori     r3, r3, KVMPPC_MSR_MASK@l
         mtsrr1  r3
+
+        /* Clear any debug events which occurred since we disabled MSR[DE].
+         * XXX This gives us a 3-instruction window in which a breakpoint
+         * intended for guest context could fire in the host instead. */
+        lis     r3, 0xffff
+        ori     r3, r3, 0xffff
+        mtspr   SPRN_DBSR, r3
+
         lwz     r3, VCPU_GPR(r3)(r4)
         lwz     r4, VCPU_GPR(r4)(r4)
         rfi
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 53826a5f6c06..b75607180ddb 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -239,18 +239,100 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 {
 }
 
+/* Note: clearing MSR[DE] just means that the debug interrupt will not be
+ * delivered *immediately*. Instead, it simply sets the appropriate DBSR bits.
+ * If those DBSR bits are still set when MSR[DE] is re-enabled, the interrupt
+ * will be delivered as an "imprecise debug event" (which is indicated by
+ * DBSR[IDE].
+ */
+static void kvmppc_disable_debug_interrupts(void)
+{
+        mtmsr(mfmsr() & ~MSR_DE);
+}
+
+static void kvmppc_restore_host_debug_state(struct kvm_vcpu *vcpu)
+{
+        kvmppc_disable_debug_interrupts();
+
+        mtspr(SPRN_IAC1, vcpu->arch.host_iac[0]);
+        mtspr(SPRN_IAC2, vcpu->arch.host_iac[1]);
+        mtspr(SPRN_IAC3, vcpu->arch.host_iac[2]);
+        mtspr(SPRN_IAC4, vcpu->arch.host_iac[3]);
+        mtspr(SPRN_DBCR1, vcpu->arch.host_dbcr1);
+        mtspr(SPRN_DBCR2, vcpu->arch.host_dbcr2);
+        mtspr(SPRN_DBCR0, vcpu->arch.host_dbcr0);
+        mtmsr(vcpu->arch.host_msr);
+}
+
+static void kvmppc_load_guest_debug_registers(struct kvm_vcpu *vcpu)
+{
+        struct kvm_guest_debug *dbg = &vcpu->guest_debug;
+        u32 dbcr0 = 0;
+
+        vcpu->arch.host_msr = mfmsr();
+        kvmppc_disable_debug_interrupts();
+
+        /* Save host debug register state. */
+        vcpu->arch.host_iac[0] = mfspr(SPRN_IAC1);
+        vcpu->arch.host_iac[1] = mfspr(SPRN_IAC2);
+        vcpu->arch.host_iac[2] = mfspr(SPRN_IAC3);
+        vcpu->arch.host_iac[3] = mfspr(SPRN_IAC4);
+        vcpu->arch.host_dbcr0 = mfspr(SPRN_DBCR0);
+        vcpu->arch.host_dbcr1 = mfspr(SPRN_DBCR1);
+        vcpu->arch.host_dbcr2 = mfspr(SPRN_DBCR2);
+
+        /* set registers up for guest */
+
+        if (dbg->bp[0]) {
+                mtspr(SPRN_IAC1, dbg->bp[0]);
+                dbcr0 |= DBCR0_IAC1 | DBCR0_IDM;
+        }
+        if (dbg->bp[1]) {
+                mtspr(SPRN_IAC2, dbg->bp[1]);
+                dbcr0 |= DBCR0_IAC2 | DBCR0_IDM;
+        }
+        if (dbg->bp[2]) {
+                mtspr(SPRN_IAC3, dbg->bp[2]);
+                dbcr0 |= DBCR0_IAC3 | DBCR0_IDM;
+        }
+        if (dbg->bp[3]) {
+                mtspr(SPRN_IAC4, dbg->bp[3]);
+                dbcr0 |= DBCR0_IAC4 | DBCR0_IDM;
+        }
+
+        mtspr(SPRN_DBCR0, dbcr0);
+        mtspr(SPRN_DBCR1, 0);
+        mtspr(SPRN_DBCR2, 0);
+}
+
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 {
+        if (vcpu->guest_debug.enabled)
+                kvmppc_load_guest_debug_registers(vcpu);
 }
 
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 {
+        if (vcpu->guest_debug.enabled)
+                kvmppc_restore_host_debug_state(vcpu);
 }
 
 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
                                     struct kvm_debug_guest *dbg)
 {
-        return -ENOTSUPP;
+        int i;
+
+        vcpu->guest_debug.enabled = dbg->enabled;
+        if (vcpu->guest_debug.enabled) {
+                for (i=0; i < ARRAY_SIZE(vcpu->guest_debug.bp); i++) {
+                        if (dbg->breakpoints[i].enabled)
+                                vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
+                        else
+                                vcpu->guest_debug.bp[i] = 0;
+                }
+        }
+
+        return 0;
 }
 
 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,