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-rw-r--r--arch/powerpc/include/asm/kvm_host.h3
-rw-r--r--arch/powerpc/include/asm/kvm_ppc.h2
-rw-r--r--arch/powerpc/include/asm/reg_booke.h7
-rw-r--r--arch/powerpc/kvm/book3s.c9
-rw-r--r--arch/powerpc/kvm/booke.c155
-rw-r--r--arch/powerpc/kvm/booke_emulate.c8
-rw-r--r--arch/powerpc/kvm/powerpc.c14
-rw-r--r--include/linux/kvm.h2
-rw-r--r--include/linux/kvm_host.h1
9 files changed, 199 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 4a5ec8f573c7..51b0ccd56769 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -471,6 +471,8 @@ struct kvm_vcpu_arch {
ulong fault_esr;
ulong queued_dear;
ulong queued_esr;
+ spinlock_t wdt_lock;
+ struct timer_list wdt_timer;
u32 tlbcfg[4];
u32 mmucfg;
u32 epr;
@@ -486,6 +488,7 @@ struct kvm_vcpu_arch {
u8 osi_needed;
u8 osi_enabled;
u8 papr_enabled;
+ u8 watchdog_enabled;
u8 sane;
u8 cpu_type;
u8 hcall_needed;
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 3dfc437fb9d9..c06a64b53362 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -68,6 +68,8 @@ extern void kvmppc_emulate_dec(struct kvm_vcpu *vcpu);
extern u32 kvmppc_get_dec(struct kvm_vcpu *vcpu, u64 tb);
extern void kvmppc_decrementer_func(unsigned long data);
extern int kvmppc_sanity_check(struct kvm_vcpu *vcpu);
+extern int kvmppc_subarch_vcpu_init(struct kvm_vcpu *vcpu);
+extern void kvmppc_subarch_vcpu_uninit(struct kvm_vcpu *vcpu);
/* Core-specific hooks */
diff --git a/arch/powerpc/include/asm/reg_booke.h b/arch/powerpc/include/asm/reg_booke.h
index 2d916c4982c5..e07e6af5e1ff 100644
--- a/arch/powerpc/include/asm/reg_booke.h
+++ b/arch/powerpc/include/asm/reg_booke.h
@@ -539,6 +539,13 @@
#define TCR_FIE 0x00800000 /* FIT Interrupt Enable */
#define TCR_ARE 0x00400000 /* Auto Reload Enable */
+#ifdef CONFIG_E500
+#define TCR_GET_WP(tcr) ((((tcr) & 0xC0000000) >> 30) | \
+ (((tcr) & 0x1E0000) >> 15))
+#else
+#define TCR_GET_WP(tcr) (((tcr) & 0xC0000000) >> 30)
+#endif
+
/* Bit definitions for the TSR. */
#define TSR_ENW 0x80000000 /* Enable Next Watchdog */
#define TSR_WIS 0x40000000 /* WDT Interrupt Status */
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 3f2a8360c857..e94666566fa9 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -411,6 +411,15 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
return 0;
}
+int kvmppc_subarch_vcpu_init(struct kvm_vcpu *vcpu)
+{
+ return 0;
+}
+
+void kvmppc_subarch_vcpu_uninit(struct kvm_vcpu *vcpu)
+{
+}
+
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
int i;
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index c36493087dbf..09e8bf33a8c9 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -209,6 +209,16 @@ void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu,
clear_bit(BOOKE_IRQPRIO_EXTERNAL_LEVEL, &vcpu->arch.pending_exceptions);
}
+static void kvmppc_core_queue_watchdog(struct kvm_vcpu *vcpu)
+{
+ kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_WATCHDOG);
+}
+
+static void kvmppc_core_dequeue_watchdog(struct kvm_vcpu *vcpu)
+{
+ clear_bit(BOOKE_IRQPRIO_WATCHDOG, &vcpu->arch.pending_exceptions);
+}
+
static void set_guest_srr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
{
#ifdef CONFIG_KVM_BOOKE_HV
@@ -328,6 +338,7 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
msr_mask = MSR_CE | MSR_ME | MSR_DE;
int_class = INT_CLASS_NONCRIT;
break;
+ case BOOKE_IRQPRIO_WATCHDOG:
case BOOKE_IRQPRIO_CRITICAL:
case BOOKE_IRQPRIO_DBELL_CRIT:
allowed = vcpu->arch.shared->msr & MSR_CE;
@@ -407,12 +418,121 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
return allowed;
}
+/*
+ * Return the number of jiffies until the next timeout. If the timeout is
+ * longer than the NEXT_TIMER_MAX_DELTA, then return NEXT_TIMER_MAX_DELTA
+ * because the larger value can break the timer APIs.
+ */
+static unsigned long watchdog_next_timeout(struct kvm_vcpu *vcpu)
+{
+ u64 tb, wdt_tb, wdt_ticks = 0;
+ u64 nr_jiffies = 0;
+ u32 period = TCR_GET_WP(vcpu->arch.tcr);
+
+ wdt_tb = 1ULL << (63 - period);
+ tb = get_tb();
+ /*
+ * The watchdog timeout will hapeen when TB bit corresponding
+ * to watchdog will toggle from 0 to 1.
+ */
+ if (tb & wdt_tb)
+ wdt_ticks = wdt_tb;
+
+ wdt_ticks += wdt_tb - (tb & (wdt_tb - 1));
+
+ /* Convert timebase ticks to jiffies */
+ nr_jiffies = wdt_ticks;
+
+ if (do_div(nr_jiffies, tb_ticks_per_jiffy))
+ nr_jiffies++;
+
+ return min_t(unsigned long long, nr_jiffies, NEXT_TIMER_MAX_DELTA);
+}
+
+static void arm_next_watchdog(struct kvm_vcpu *vcpu)
+{
+ unsigned long nr_jiffies;
+ unsigned long flags;
+
+ /*
+ * If TSR_ENW and TSR_WIS are not set then no need to exit to
+ * userspace, so clear the KVM_REQ_WATCHDOG request.
+ */
+ if ((vcpu->arch.tsr & (TSR_ENW | TSR_WIS)) != (TSR_ENW | TSR_WIS))
+ clear_bit(KVM_REQ_WATCHDOG, &vcpu->requests);
+
+ spin_lock_irqsave(&vcpu->arch.wdt_lock, flags);
+ nr_jiffies = watchdog_next_timeout(vcpu);
+ /*
+ * If the number of jiffies of watchdog timer >= NEXT_TIMER_MAX_DELTA
+ * then do not run the watchdog timer as this can break timer APIs.
+ */
+ if (nr_jiffies < NEXT_TIMER_MAX_DELTA)
+ mod_timer(&vcpu->arch.wdt_timer, jiffies + nr_jiffies);
+ else
+ del_timer(&vcpu->arch.wdt_timer);
+ spin_unlock_irqrestore(&vcpu->arch.wdt_lock, flags);
+}
+
+void kvmppc_watchdog_func(unsigned long data)
+{
+ struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
+ u32 tsr, new_tsr;
+ int final;
+
+ do {
+ new_tsr = tsr = vcpu->arch.tsr;
+ final = 0;
+
+ /* Time out event */
+ if (tsr & TSR_ENW) {
+ if (tsr & TSR_WIS)
+ final = 1;
+ else
+ new_tsr = tsr | TSR_WIS;
+ } else {
+ new_tsr = tsr | TSR_ENW;
+ }
+ } while (cmpxchg(&vcpu->arch.tsr, tsr, new_tsr) != tsr);
+
+ if (new_tsr & TSR_WIS) {
+ smp_wmb();
+ kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
+ kvm_vcpu_kick(vcpu);
+ }
+
+ /*
+ * If this is final watchdog expiry and some action is required
+ * then exit to userspace.
+ */
+ if (final && (vcpu->arch.tcr & TCR_WRC_MASK) &&
+ vcpu->arch.watchdog_enabled) {
+ smp_wmb();
+ kvm_make_request(KVM_REQ_WATCHDOG, vcpu);
+ kvm_vcpu_kick(vcpu);
+ }
+
+ /*
+ * Stop running the watchdog timer after final expiration to
+ * prevent the host from being flooded with timers if the
+ * guest sets a short period.
+ * Timers will resume when TSR/TCR is updated next time.
+ */
+ if (!final)
+ arm_next_watchdog(vcpu);
+}
+
static void update_timer_ints(struct kvm_vcpu *vcpu)
{
if ((vcpu->arch.tcr & TCR_DIE) && (vcpu->arch.tsr & TSR_DIS))
kvmppc_core_queue_dec(vcpu);
else
kvmppc_core_dequeue_dec(vcpu);
+
+ if ((vcpu->arch.tcr & TCR_WIE) && (vcpu->arch.tsr & TSR_WIS))
+ kvmppc_core_queue_watchdog(vcpu);
+ else
+ kvmppc_core_dequeue_watchdog(vcpu);
}
static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu)
@@ -466,6 +586,11 @@ int kvmppc_core_check_requests(struct kvm_vcpu *vcpu)
kvmppc_core_flush_tlb(vcpu);
#endif
+ if (kvm_check_request(KVM_REQ_WATCHDOG, vcpu)) {
+ vcpu->run->exit_reason = KVM_EXIT_WATCHDOG;
+ r = 0;
+ }
+
return r;
}
@@ -995,6 +1120,21 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
return r;
}
+int kvmppc_subarch_vcpu_init(struct kvm_vcpu *vcpu)
+{
+ /* setup watchdog timer once */
+ spin_lock_init(&vcpu->arch.wdt_lock);
+ setup_timer(&vcpu->arch.wdt_timer, kvmppc_watchdog_func,
+ (unsigned long)vcpu);
+
+ return 0;
+}
+
+void kvmppc_subarch_vcpu_uninit(struct kvm_vcpu *vcpu)
+{
+ del_timer_sync(&vcpu->arch.wdt_timer);
+}
+
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
int i;
@@ -1090,7 +1230,13 @@ static int set_sregs_base(struct kvm_vcpu *vcpu,
}
if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_TSR) {
+ u32 old_tsr = vcpu->arch.tsr;
+
vcpu->arch.tsr = sregs->u.e.tsr;
+
+ if ((old_tsr ^ vcpu->arch.tsr) & (TSR_ENW | TSR_WIS))
+ arm_next_watchdog(vcpu);
+
update_timer_ints(vcpu);
}
@@ -1251,6 +1397,7 @@ void kvmppc_core_commit_memory_region(struct kvm *kvm,
void kvmppc_set_tcr(struct kvm_vcpu *vcpu, u32 new_tcr)
{
vcpu->arch.tcr = new_tcr;
+ arm_next_watchdog(vcpu);
update_timer_ints(vcpu);
}
@@ -1265,6 +1412,14 @@ void kvmppc_set_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits)
void kvmppc_clr_tsr_bits(struct kvm_vcpu *vcpu, u32 tsr_bits)
{
clear_bits(tsr_bits, &vcpu->arch.tsr);
+
+ /*
+ * We may have stopped the watchdog due to
+ * being stuck on final expiration.
+ */
+ if (tsr_bits & (TSR_ENW | TSR_WIS))
+ arm_next_watchdog(vcpu);
+
update_timer_ints(vcpu);
}
diff --git a/arch/powerpc/kvm/booke_emulate.c b/arch/powerpc/kvm/booke_emulate.c
index 12834bb608ab..5a66ade7fd17 100644
--- a/arch/powerpc/kvm/booke_emulate.c
+++ b/arch/powerpc/kvm/booke_emulate.c
@@ -145,6 +145,14 @@ int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
kvmppc_clr_tsr_bits(vcpu, spr_val);
break;
case SPRN_TCR:
+ /*
+ * WRC is a 2-bit field that is supposed to preserve its
+ * value once written to non-zero.
+ */
+ if (vcpu->arch.tcr & TCR_WRC_MASK) {
+ spr_val &= ~TCR_WRC_MASK;
+ spr_val |= vcpu->arch.tcr & TCR_WRC_MASK;
+ }
kvmppc_set_tcr(vcpu, spr_val);
break;
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 54b12af577d0..0ffd7d17adc7 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -300,6 +300,7 @@ int kvm_dev_ioctl_check_extension(long ext)
switch (ext) {
#ifdef CONFIG_BOOKE
case KVM_CAP_PPC_BOOKE_SREGS:
+ case KVM_CAP_PPC_BOOKE_WATCHDOG:
#else
case KVM_CAP_PPC_SEGSTATE:
case KVM_CAP_PPC_HIOR:
@@ -476,6 +477,8 @@ enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
+ int ret;
+
hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
@@ -484,13 +487,14 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
#ifdef CONFIG_KVM_EXIT_TIMING
mutex_init(&vcpu->arch.exit_timing_lock);
#endif
-
- return 0;
+ ret = kvmppc_subarch_vcpu_init(vcpu);
+ return ret;
}
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
kvmppc_mmu_destroy(vcpu);
+ kvmppc_subarch_vcpu_uninit(vcpu);
}
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
@@ -735,6 +739,12 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
r = 0;
vcpu->arch.papr_enabled = true;
break;
+#ifdef CONFIG_BOOKE
+ case KVM_CAP_PPC_BOOKE_WATCHDOG:
+ r = 0;
+ vcpu->arch.watchdog_enabled = true;
+ break;
+#endif
#if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
case KVM_CAP_SW_TLB: {
struct kvm_config_tlb cfg;
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 4cb3761bebae..1649d4b57e1f 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -167,6 +167,7 @@ struct kvm_pit_config {
#define KVM_EXIT_OSI 18
#define KVM_EXIT_PAPR_HCALL 19
#define KVM_EXIT_S390_UCONTROL 20
+#define KVM_EXIT_WATCHDOG 21
/* For KVM_EXIT_INTERNAL_ERROR */
#define KVM_INTERNAL_ERROR_EMULATION 1
@@ -628,6 +629,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_READONLY_MEM 81
#endif
#define KVM_CAP_IRQFD_RESAMPLE 82
+#define KVM_CAP_PPC_BOOKE_WATCHDOG 83
#ifdef KVM_CAP_IRQ_ROUTING
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2850656e2e96..0ca3663206f8 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -118,6 +118,7 @@ static inline bool is_error_page(struct page *page)
#define KVM_REQ_IMMEDIATE_EXIT 15
#define KVM_REQ_PMU 16
#define KVM_REQ_PMI 17
+#define KVM_REQ_WATCHDOG 18
#define KVM_USERSPACE_IRQ_SOURCE_ID 0
#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.