powerpc fixes for 4.15 #5

Of note is two fixes for KVM XIVE (Power9 interrupt controller). These would
 normally go via the KVM tree but Paul is away so I've picked them up.
 
 Other than that, two fixes for error handling in the IMC driver, and one for a
 potential oops in the BHRB code if the hardware records a branch address that
 has subsequently been unmapped, and finally a s/%p/%px/ in our oops code.
 
 Thanks to:
   Anju T Sudhakar, Cédric Le Goater, Laurent Vivier, Madhavan Srinivasan, Naveen
   N. Rao, Ravi Bangoria.
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Merge tag 'powerpc-4.15-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "This is all fairly boring, except that there's two KVM fixes that
  you'd normally get via Paul's kvm-ppc tree. He's away so I picked them
  up. I was waiting to see if he would apply them, which is why they
  have only been in my tree since today. But they were on the list for a
  while and have been tested on the relevant hardware.

  Of note is two fixes for KVM XIVE (Power9 interrupt controller). These
  would normally go via the KVM tree but Paul is away so I've picked
  them up.

  Other than that, two fixes for error handling in the IMC driver, and
  one for a potential oops in the BHRB code if the hardware records a
  branch address that has subsequently been unmapped, and finally a
  s/%p/%px/ in our oops code.

  Thanks to: Anju T Sudhakar, Cédric Le Goater, Laurent Vivier, Madhavan
  Srinivasan, Naveen N. Rao, Ravi Bangoria"

* tag 'powerpc-4.15-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  KVM: PPC: Book3S HV: Fix pending_pri value in kvmppc_xive_get_icp()
  KVM: PPC: Book3S: fix XIVE migration of pending interrupts
  powerpc/kernel: Print actual address of regs when oopsing
  powerpc/perf: Fix kfree memory allocated for nest pmus
  powerpc/perf/imc: Fix nest-imc cpuhotplug callback failure
  powerpc/perf: Dereference BHRB entries safely

arch/powerpc/kernel/process.c

@@ -1403,7 +1403,7 @@ void show_regs(struct pt_regs * regs)
 
 	printk("NIP:  "REG" LR: "REG" CTR: "REG"\n",
 	       regs->nip, regs->link, regs->ctr);
-	printk("REGS: %p TRAP: %04lx   %s  (%s)\n",
+	printk("REGS: %px TRAP: %04lx   %s  (%s)\n",
 	       regs, regs->trap, print_tainted(), init_utsname()->release);
 	printk("MSR:  "REG" ", regs->msr);
 	print_msr_bits(regs->msr);

arch/powerpc/kvm/book3s_xive.c

@@ -725,7 +725,8 @@ u64 kvmppc_xive_get_icp(struct kvm_vcpu *vcpu)
 
 	/* Return the per-cpu state for state saving/migration */
 	return (u64)xc->cppr << KVM_REG_PPC_ICP_CPPR_SHIFT |
-	       (u64)xc->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT;
+	       (u64)xc->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT |
+	       (u64)0xff << KVM_REG_PPC_ICP_PPRI_SHIFT;
 }
 
 int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64 icpval)
@@ -1558,7 +1559,7 @@ static int xive_set_source(struct kvmppc_xive *xive, long irq, u64 addr)
 
 	/*
 	 * Restore P and Q. If the interrupt was pending, we
-	 * force both P and Q, which will trigger a resend.
+	 * force Q and !P, which will trigger a resend.
 	 *
 	 * That means that a guest that had both an interrupt
 	 * pending (queued) and Q set will restore with only
@@ -1566,7 +1567,7 @@ static int xive_set_source(struct kvmppc_xive *xive, long irq, u64 addr)
 	 * is perfectly fine as coalescing interrupts that haven't
 	 * been presented yet is always allowed.
 	 */
-	if (val & KVM_XICS_PRESENTED || val & KVM_XICS_PENDING)
+	if (val & KVM_XICS_PRESENTED && !(val & KVM_XICS_PENDING))
 		state->old_p = true;
 	if (val & KVM_XICS_QUEUED || val & KVM_XICS_PENDING)
 		state->old_q = true;

arch/powerpc/perf/core-book3s.c

@@ -410,8 +410,12 @@ static __u64 power_pmu_bhrb_to(u64 addr)
 	int ret;
 	__u64 target;
 
-	if (is_kernel_addr(addr))
-		return branch_target((unsigned int *)addr);
+	if (is_kernel_addr(addr)) {
+		if (probe_kernel_read(&instr, (void *)addr, sizeof(instr)))
+			return 0;
+
+		return branch_target(&instr);
+	}
 
 	/* Userspace: need copy instruction here then translate it */
 	pagefault_disable();

arch/powerpc/perf/imc-pmu.c

@@ -309,6 +309,19 @@ static int ppc_nest_imc_cpu_offline(unsigned int cpu)
 	if (!cpumask_test_and_clear_cpu(cpu, &nest_imc_cpumask))
 		return 0;
 
+	/*
+	 * Check whether nest_imc is registered. We could end up here if the
+	 * cpuhotplug callback registration fails. i.e, callback invokes the
+	 * offline path for all successfully registered nodes. At this stage,
+	 * nest_imc pmu will not be registered and we should return here.
+	 *
+	 * We return with a zero since this is not an offline failure. And
+	 * cpuhp_setup_state() returns the actual failure reason to the caller,
+	 * which in turn will call the cleanup routine.
+	 */
+	if (!nest_pmus)
+		return 0;
+
 	/*
 	 * Now that this cpu is one of the designated,
 	 * find a next cpu a) which is online and b) in same chip.
@@ -1171,6 +1184,7 @@ static void imc_common_cpuhp_mem_free(struct imc_pmu *pmu_ptr)
 		if (nest_pmus == 1) {
 			cpuhp_remove_state(CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE);
 			kfree(nest_imc_refc);
+			kfree(per_nest_pmu_arr);
 		}
 
 		if (nest_pmus > 0)
@@ -1195,7 +1209,6 @@ static void imc_common_cpuhp_mem_free(struct imc_pmu *pmu_ptr)
 		kfree(pmu_ptr->attr_groups[IMC_EVENT_ATTR]->attrs);
 	kfree(pmu_ptr->attr_groups[IMC_EVENT_ATTR]);
 	kfree(pmu_ptr);
-	kfree(per_nest_pmu_arr);
 	return;
 }
 
@@ -1309,6 +1322,8 @@ int init_imc_pmu(struct device_node *parent, struct imc_pmu *pmu_ptr, int pmu_id
 			ret = nest_pmu_cpumask_init();
 			if (ret) {
 				mutex_unlock(&nest_init_lock);
+				kfree(nest_imc_refc);
+				kfree(per_nest_pmu_arr);
 				goto err_free;
 			}
 		}