KVM: x86: switch pvclock_gtod_sync_lock to a raw spinlock

On the preemption path when updating a Xen guest's runstate times, this
lock is taken inside the scheduler rq->lock, which is a raw spinlock.
This was shown in a lockdep warning:

[   89.138354] =============================
[   89.138356] [ BUG: Invalid wait context ]
[   89.138358] 5.15.0-rc5+ #834 Tainted: G S        I E
[   89.138360] -----------------------------
[   89.138361] xen_shinfo_test/2575 is trying to lock:
[   89.138363] ffffa34a0364efd8 (&kvm->arch.pvclock_gtod_sync_lock){....}-{3:3}, at: get_kvmclock_ns+0x1f/0x130 [kvm]
[   89.138442] other info that might help us debug this:
[   89.138444] context-{5:5}
[   89.138445] 4 locks held by xen_shinfo_test/2575:
[   89.138447]  #0: ffff972bdc3b8108 (&vcpu->mutex){+.+.}-{4:4}, at: kvm_vcpu_ioctl+0x77/0x6f0 [kvm]
[   89.138483]  #1: ffffa34a03662e90 (&kvm->srcu){....}-{0:0}, at: kvm_arch_vcpu_ioctl_run+0xdc/0x8b0 [kvm]
[   89.138526]  #2: ffff97331fdbac98 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0xff/0xbd0
[   89.138534]  #3: ffffa34a03662e90 (&kvm->srcu){....}-{0:0}, at: kvm_arch_vcpu_put+0x26/0x170 [kvm]
...
[   89.138695]  get_kvmclock_ns+0x1f/0x130 [kvm]
[   89.138734]  kvm_xen_update_runstate+0x14/0x90 [kvm]
[   89.138783]  kvm_xen_update_runstate_guest+0x15/0xd0 [kvm]
[   89.138830]  kvm_arch_vcpu_put+0xe6/0x170 [kvm]
[   89.138870]  kvm_sched_out+0x2f/0x40 [kvm]
[   89.138900]  __schedule+0x5de/0xbd0

Cc: stable@vger.kernel.org
Reported-by: syzbot+b282b65c2c68492df769@syzkaller.appspotmail.com
Fixes: 30b5c851af79 ("KVM: x86/xen: Add support for vCPU runstate information")
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <1b02a06421c17993df337493a68ba923f3bd5c0f.camel@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f8f48a7..7077137 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1097,7 +1097,7 @@ struct kvm_arch {
        u64 cur_tsc_generation;
        int nr_vcpus_matched_tsc;
 
-       spinlock_t pvclock_gtod_sync_lock;
+       raw_spinlock_t pvclock_gtod_sync_lock;
        bool use_master_clock;
        u64 master_kernel_ns;
        u64 master_cycle_now;

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0c8b512..5c82eff 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2542,7 +2542,7 @@ static void kvm_synchronize_tsc(struct kvm_vcpu *vcpu, u64 data)
        kvm_vcpu_write_tsc_offset(vcpu, offset);
        raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
 
-       spin_lock_irqsave(&kvm->arch.pvclock_gtod_sync_lock, flags);
+       raw_spin_lock_irqsave(&kvm->arch.pvclock_gtod_sync_lock, flags);
        if (!matched) {
                kvm->arch.nr_vcpus_matched_tsc = 0;
        } else if (!already_matched) {
@@ -2550,7 +2550,7 @@ static void kvm_synchronize_tsc(struct kvm_vcpu *vcpu, u64 data)
        }
 
        kvm_track_tsc_matching(vcpu);
-       spin_unlock_irqrestore(&kvm->arch.pvclock_gtod_sync_lock, flags);
+       raw_spin_unlock_irqrestore(&kvm->arch.pvclock_gtod_sync_lock, flags);
 }
 
 static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
@@ -2780,9 +2780,9 @@ static void kvm_gen_update_masterclock(struct kvm *kvm)
        kvm_make_mclock_inprogress_request(kvm);
 
        /* no guest entries from this point */
-       spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
+       raw_spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
        pvclock_update_vm_gtod_copy(kvm);
-       spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
+       raw_spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
 
        kvm_for_each_vcpu(i, vcpu, kvm)
                kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
@@ -2800,15 +2800,15 @@ u64 get_kvmclock_ns(struct kvm *kvm)
        unsigned long flags;
        u64 ret;
 
-       spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
+       raw_spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
        if (!ka->use_master_clock) {
-               spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
+               raw_spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
                return get_kvmclock_base_ns() + ka->kvmclock_offset;
        }
 
        hv_clock.tsc_timestamp = ka->master_cycle_now;
        hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset;
-       spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
+       raw_spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
 
        /* both __this_cpu_read() and rdtsc() should be on the same cpu */
        get_cpu();
@@ -2902,13 +2902,13 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
         * If the host uses TSC clock, then passthrough TSC as stable
         * to the guest.
         */
-       spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
+       raw_spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
        use_master_clock = ka->use_master_clock;
        if (use_master_clock) {
                host_tsc = ka->master_cycle_now;
                kernel_ns = ka->master_kernel_ns;
        }
-       spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
+       raw_spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
 
        /* Keep irq disabled to prevent changes to the clock */
        local_irq_save(flags);
@@ -6100,13 +6100,13 @@ set_pit2_out:
                 * is slightly ahead) here we risk going negative on unsigned
                 * 'system_time' when 'user_ns.clock' is very small.
                 */
-               spin_lock_irq(&ka->pvclock_gtod_sync_lock);
+               raw_spin_lock_irq(&ka->pvclock_gtod_sync_lock);
                if (kvm->arch.use_master_clock)
                        now_ns = ka->master_kernel_ns;
                else
                        now_ns = get_kvmclock_base_ns();
                ka->kvmclock_offset = user_ns.clock - now_ns;
-               spin_unlock_irq(&ka->pvclock_gtod_sync_lock);
+               raw_spin_unlock_irq(&ka->pvclock_gtod_sync_lock);
 
                kvm_make_all_cpus_request(kvm, KVM_REQ_CLOCK_UPDATE);
                break;
@@ -8139,9 +8139,9 @@ static void kvm_hyperv_tsc_notifier(void)
        list_for_each_entry(kvm, &vm_list, vm_list) {
                struct kvm_arch *ka = &kvm->arch;
 
-               spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
+               raw_spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
                pvclock_update_vm_gtod_copy(kvm);
-               spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
+               raw_spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
 
                kvm_for_each_vcpu(cpu, vcpu, kvm)
                        kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
@@ -11182,7 +11182,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 
        raw_spin_lock_init(&kvm->arch.tsc_write_lock);
        mutex_init(&kvm->arch.apic_map_lock);
-       spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock);
+       raw_spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock);
 
        kvm->arch.kvmclock_offset = -get_kvmclock_base_ns();
        pvclock_update_vm_gtod_copy(kvm);