unsigned long stolen;
unsigned long core_stolen;
u64 now;
+ unsigned long flags;
dt = vcpu->arch.dtl_ptr;
vpa = vcpu->arch.vpa.pinned_addr;
core_stolen = vcore_stolen_time(vc, now);
stolen = core_stolen - vcpu->arch.stolen_logged;
vcpu->arch.stolen_logged = core_stolen;
- spin_lock_irq(&vcpu->arch.tbacct_lock);
+ spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
stolen += vcpu->arch.busy_stolen;
vcpu->arch.busy_stolen = 0;
- spin_unlock_irq(&vcpu->arch.tbacct_lock);
+ spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
if (!dt || !vpa)
return;
memset(dt, 0, sizeof(struct dtl_entry));
}
}
-extern void __kvmppc_vcore_entry(void);
+extern int __kvmppc_vcore_entry(void);
static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
struct kvm_vcpu *vcpu)
smp_call_function_single(cpu + i, do_nothing, NULL, 1);
}
+static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+
+ /*
+ * With radix, the guest can do TLB invalidations itself,
+ * and it could choose to use the local form (tlbiel) if
+ * it is invalidating a translation that has only ever been
+ * used on one vcpu. However, that doesn't mean it has
+ * only ever been used on one physical cpu, since vcpus
+ * can move around between pcpus. To cope with this, when
+ * a vcpu moves from one pcpu to another, we need to tell
+ * any vcpus running on the same core as this vcpu previously
+ * ran to flush the TLB. The TLB is shared between threads,
+ * so we use a single bit in .need_tlb_flush for all 4 threads.
+ */
+ if (vcpu->arch.prev_cpu != pcpu) {
+ if (vcpu->arch.prev_cpu >= 0 &&
+ cpu_first_thread_sibling(vcpu->arch.prev_cpu) !=
+ cpu_first_thread_sibling(pcpu))
+ radix_flush_cpu(kvm, vcpu->arch.prev_cpu, vcpu);
+ vcpu->arch.prev_cpu = pcpu;
+ }
+}
+
static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
{
int cpu;
cpu += vcpu->arch.ptid;
vcpu->cpu = vc->pcpu;
vcpu->arch.thread_cpu = cpu;
-
- /*
- * With radix, the guest can do TLB invalidations itself,
- * and it could choose to use the local form (tlbiel) if
- * it is invalidating a translation that has only ever been
- * used on one vcpu. However, that doesn't mean it has
- * only ever been used on one physical cpu, since vcpus
- * can move around between pcpus. To cope with this, when
- * a vcpu moves from one pcpu to another, we need to tell
- * any vcpus running on the same core as this vcpu previously
- * ran to flush the TLB. The TLB is shared between threads,
- * so we use a single bit in .need_tlb_flush for all 4 threads.
- */
- if (kvm_is_radix(kvm) && vcpu->arch.prev_cpu != cpu) {
- if (vcpu->arch.prev_cpu >= 0 &&
- cpu_first_thread_sibling(vcpu->arch.prev_cpu) !=
- cpu_first_thread_sibling(cpu))
- radix_flush_cpu(kvm, vcpu->arch.prev_cpu, vcpu);
- vcpu->arch.prev_cpu = cpu;
- }
cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest);
}
tpaca = &paca[cpu];
spin_unlock(&lp->lock);
}
+static bool recheck_signals(struct core_info *cip)
+{
+ int sub, i;
+ struct kvm_vcpu *vcpu;
+
+ for (sub = 0; sub < cip->n_subcores; ++sub)
+ for_each_runnable_thread(i, vcpu, cip->vc[sub])
+ if (signal_pending(vcpu->arch.run_task))
+ return true;
+ return false;
+}
+
static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
{
int still_running = 0, i;
return 0;
}
+static void set_irq_happened(int trap)
+{
+ switch (trap) {
+ case BOOK3S_INTERRUPT_EXTERNAL:
+ local_paca->irq_happened |= PACA_IRQ_EE;
+ break;
+ case BOOK3S_INTERRUPT_H_DOORBELL:
+ local_paca->irq_happened |= PACA_IRQ_DBELL;
+ break;
+ case BOOK3S_INTERRUPT_HMI:
+ local_paca->irq_happened |= PACA_IRQ_HMI;
+ break;
+ }
+}
+
/*
* Run a set of guest threads on a physical core.
* Called with vc->lock held.
int pcpu, thr;
int target_threads;
int controlled_threads;
+ int trap;
/*
* Remove from the list any threads that have a signal pending
if (vc->num_threads < target_threads)
collect_piggybacks(&core_info, target_threads);
+ /*
+ * On radix, arrange for TLB flushing if necessary.
+ * This has to be done before disabling interrupts since
+ * it uses smp_call_function().
+ */
+ pcpu = smp_processor_id();
+ if (kvm_is_radix(vc->kvm)) {
+ for (sub = 0; sub < core_info.n_subcores; ++sub)
+ for_each_runnable_thread(i, vcpu, core_info.vc[sub])
+ kvmppc_prepare_radix_vcpu(vcpu, pcpu);
+ }
+
+ /*
+ * Hard-disable interrupts, and check resched flag and signals.
+ * If we need to reschedule or deliver a signal, clean up
+ * and return without going into the guest(s).
+ */
+ local_irq_disable();
+ hard_irq_disable();
+ if (lazy_irq_pending() || need_resched() ||
+ recheck_signals(&core_info)) {
+ local_irq_enable();
+ vc->vcore_state = VCORE_INACTIVE;
+ /* Unlock all except the primary vcore */
+ for (sub = 1; sub < core_info.n_subcores; ++sub) {
+ pvc = core_info.vc[sub];
+ /* Put back on to the preempted vcores list */
+ kvmppc_vcore_preempt(pvc);
+ spin_unlock(&pvc->lock);
+ }
+ for (i = 0; i < controlled_threads; ++i)
+ kvmppc_release_hwthread(pcpu + i);
+ return;
+ }
+
+ kvmppc_clear_host_core(pcpu);
+
/* Decide on micro-threading (split-core) mode */
subcore_size = threads_per_subcore;
cmd_bit = stat_bit = 0;
/* order writes to split_info before kvm_split_mode pointer */
smp_wmb();
}
- pcpu = smp_processor_id();
for (thr = 0; thr < controlled_threads; ++thr)
paca[pcpu + thr].kvm_hstate.kvm_split_mode = sip;
}
}
- kvmppc_clear_host_core(pcpu);
-
/* Start all the threads */
active = 0;
for (sub = 0; sub < core_info.n_subcores; ++sub) {
for (sub = 0; sub < core_info.n_subcores; ++sub)
spin_unlock(&core_info.vc[sub]->lock);
+ /*
+ * Interrupts will be enabled once we get into the guest,
+ * so tell lockdep that we're about to enable interrupts.
+ */
+ trace_hardirqs_on();
+
guest_enter();
srcu_idx = srcu_read_lock(&vc->kvm->srcu);
- __kvmppc_vcore_entry();
+ trap = __kvmppc_vcore_entry();
srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
+ guest_exit();
+
+ trace_hardirqs_off();
+ set_irq_happened(trap);
+
spin_lock(&vc->lock);
/* prevent other vcpu threads from doing kvmppc_start_thread() now */
vc->vcore_state = VCORE_EXITING;
split_info.do_nap = 0;
}
+ kvmppc_set_host_core(pcpu);
+
+ local_irq_enable();
+
/* Let secondaries go back to the offline loop */
for (i = 0; i < controlled_threads; ++i) {
kvmppc_release_hwthread(pcpu + i);
cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest);
}
- kvmppc_set_host_core(pcpu);
-
spin_unlock(&vc->lock);
/* make sure updates to secondary vcpu structs are visible now */
smp_mb();
- guest_exit();
for (sub = 0; sub < core_info.n_subcores; ++sub) {
pvc = core_info.vc[sub];
std r0, PPC_LR_STKOFF(r1)
stdu r1, -112(r1)
mfmsr r10
+ std r10, HSTATE_HOST_MSR(r13)
LOAD_REG_ADDR(r5, kvmppc_call_hv_entry)
li r0,MSR_RI
andc r0,r10,r0
addi r1, r1, 112
ld r7, HSTATE_HOST_MSR(r13)
+ /* Return the trap number on this thread as the return value */
+ mr r3, r12
+
/*
* If we came back from the guest via a relocation-on interrupt,
* we will be in virtual mode at this point, which makes it a
andi. r0, r0, MSR_IR /* in real mode? */
bne .Lvirt_return
- cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL
- beq 11f
- cmpwi r12, BOOK3S_INTERRUPT_H_DOORBELL
- beq 15f /* Invoke the H_DOORBELL handler */
- cmpwi cr2, r12, BOOK3S_INTERRUPT_HMI
- beq cr2, 14f /* HMI check */
-
- /* RFI into the highmem handler, or branch to interrupt handler */
+ /* RFI into the highmem handler */
mfmsr r6
li r0, MSR_RI
andc r6, r6, r0
mtmsrd r6, 1 /* Clear RI in MSR */
mtsrr0 r8
mtsrr1 r7
- /*
- * BOOK3S_INTERRUPT_MACHINE_CHECK is handled at the
- * time of guest exit
- */
RFI
- /* On POWER7, we have external interrupts set to use HSRR0/1 */
-11: mtspr SPRN_HSRR0, r8
- mtspr SPRN_HSRR1, r7
- ba 0x500
-
-14: mtspr SPRN_HSRR0, r8
- mtspr SPRN_HSRR1, r7
- b hmi_exception_after_realmode
-
-15: mtspr SPRN_HSRR0, r8
- mtspr SPRN_HSRR1, r7
- ba 0xe80
-
- /* Virtual-mode return - can't get here for HMI or machine check */
+ /* Virtual-mode return */
.Lvirt_return:
- cmpwi r12, BOOK3S_INTERRUPT_EXTERNAL
- beq 16f
- cmpwi r12, BOOK3S_INTERRUPT_H_DOORBELL
- beq 17f
- andi. r0, r7, MSR_EE /* were interrupts hard-enabled? */
- beq 18f
- mtmsrd r7, 1 /* if so then re-enable them */
-18: mtlr r8
+ mtlr r8
blr
-16: mtspr SPRN_HSRR0, r8 /* jump to reloc-on external vector */
- mtspr SPRN_HSRR1, r7
- b exc_virt_0x4500_hardware_interrupt
-
-17: mtspr SPRN_HSRR0, r8
- mtspr SPRN_HSRR1, r7
- b exc_virt_0x4e80_h_doorbell
-
kvmppc_primary_no_guest:
/* We handle this much like a ceded vcpu */
/* put the HDEC into the DEC, since HDEC interrupts don't wake us */
stw r12,VCPU_TRAP(r9)
+ /*
+ * Now that we have saved away SRR0/1 and HSRR0/1,
+ * interrupts are recoverable in principle, so set MSR_RI.
+ * This becomes important for relocation-on interrupts from
+ * the guest, which we can get in radix mode on POWER9.
+ */
+ li r0, MSR_RI
+ mtmsrd r0, 1
+
#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
addi r3, r9, VCPU_TB_RMINTR
mr r4, r9
projects / kernel.git / commitdiff