AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

KVM: arm/arm64: vgic-its: Take the srcu lock when writing to guest memory

Browse Source 
When halting a guest, QEMU flushes the virtual ITS caches, which
amounts to writing to the various tables that the guest has allocated.

When doing this, we fail to take the srcu lock, and the kernel
shouts loudly if running a lockdep kernel:

[   69.680416] =============================
[   69.680819] WARNING: suspicious RCU usage
[   69.681526] 5.1.0-rc1-00008-g600025238f51-dirty #18 Not tainted
[   69.682096] -----------------------------
[   69.682501] ./include/linux/kvm_host.h:605 suspicious rcu_dereference_check() usage!
[   69.683225]
[   69.683225] other info that might help us debug this:
[   69.683225]
[   69.683975]
[   69.683975] rcu_scheduler_active = 2, debug_locks = 1
[   69.684598] 6 locks held by qemu-system-aar/4097:
[   69.685059]  #0: 0000000034196013 (&kvm->lock){+.+.}, at: vgic_its_set_attr+0x244/0x3a0
[   69.686087]  #1: 00000000f2ed935e (&its->its_lock){+.+.}, at: vgic_its_set_attr+0x250/0x3a0
[   69.686919]  #2: 000000005e71ea54 (&vcpu->mutex){+.+.}, at: lock_all_vcpus+0x64/0xd0
[   69.687698]  #3: 00000000c17e548d (&vcpu->mutex){+.+.}, at: lock_all_vcpus+0x64/0xd0
[   69.688475]  #4: 00000000ba386017 (&vcpu->mutex){+.+.}, at: lock_all_vcpus+0x64/0xd0
[   69.689978]  #5: 00000000c2c3c335 (&vcpu->mutex){+.+.}, at: lock_all_vcpus+0x64/0xd0
[   69.690729]
[   69.690729] stack backtrace:
[   69.691151] CPU: 2 PID: 4097 Comm: qemu-system-aar Not tainted 5.1.0-rc1-00008-g600025238f51-dirty #18
[   69.691984] Hardware name: rockchip evb_rk3399/evb_rk3399, BIOS 2019.04-rc3-00124-g2feec69fb1 03/15/2019
[   69.692831] Call trace:
[   69.694072]  lockdep_rcu_suspicious+0xcc/0x110
[   69.694490]  gfn_to_memslot+0x174/0x190
[   69.694853]  kvm_write_guest+0x50/0xb0
[   69.695209]  vgic_its_save_tables_v0+0x248/0x330
[   69.695639]  vgic_its_set_attr+0x298/0x3a0
[   69.696024]  kvm_device_ioctl_attr+0x9c/0xd8
[   69.696424]  kvm_device_ioctl+0x8c/0xf8
[   69.696788]  do_vfs_ioctl+0xc8/0x960
[   69.697128]  ksys_ioctl+0x8c/0xa0
[   69.697445]  __arm64_sys_ioctl+0x28/0x38
[   69.697817]  el0_svc_common+0xd8/0x138
[   69.698173]  el0_svc_handler+0x38/0x78
[   69.698528]  el0_svc+0x8/0xc

The fix is to obviously take the srcu lock, just like we do on the
read side of things since bf308242ab. One wonders why this wasn't
fixed at the same time, but hey...

Fixes: bf308242ab ("KVM: arm/arm64: VGIC/ITS: protect kvm_read_guest() calls with SRCU lock")
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2019-03-19 12:47:11 +00:00
parent ca71228b42
commit a6ecfb11bf
4 changed files with 28 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/arm/include/asm/kvm_mmu.h
View File

@ -381,6 +381,17 @@ static inline int kvm_read_guest_lock(struct kvm *kvm,
return ret;
}
static inline int kvm_write_guest_lock(struct kvm *kvm, gpa_t gpa,
const void *data, unsigned long len)
{
int srcu_idx = srcu_read_lock(&kvm->srcu);
int ret = kvm_write_guest(kvm, gpa, data, len);
srcu_read_unlock(&kvm->srcu, srcu_idx);
return ret;
}
static inline void *kvm_get_hyp_vector(void)
{
switch(read_cpuid_part()) {

11
arch/arm64/include/asm/kvm_mmu.h
View File

@ -445,6 +445,17 @@ static inline int kvm_read_guest_lock(struct kvm *kvm,
return ret;
}
static inline int kvm_write_guest_lock(struct kvm *kvm, gpa_t gpa,
const void *data, unsigned long len)
{
int srcu_idx = srcu_read_lock(&kvm->srcu);
int ret = kvm_write_guest(kvm, gpa, data, len);
srcu_read_unlock(&kvm->srcu, srcu_idx);
return ret;
}
#ifdef CONFIG_KVM_INDIRECT_VECTORS
/*
* EL2 vectors can be mapped and rerouted in a number of ways,

8
virt/kvm/arm/vgic/vgic-its.c
View File

@ -1919,7 +1919,7 @@ static int vgic_its_save_ite(struct vgic_its *its, struct its_device *dev,
((u64)ite->irq->intid << KVM_ITS_ITE_PINTID_SHIFT) |
ite->collection->collection_id;
val = cpu_to_le64(val);
return kvm_write_guest(kvm, gpa, &val, ite_esz);
return kvm_write_guest_lock(kvm, gpa, &val, ite_esz);
}
/**
@ -2066,7 +2066,7 @@ static int vgic_its_save_dte(struct vgic_its *its, struct its_device *dev,
(itt_addr_field << KVM_ITS_DTE_ITTADDR_SHIFT) |
(dev->num_eventid_bits - 1));
val = cpu_to_le64(val);
return kvm_write_guest(kvm, ptr, &val, dte_esz);
return kvm_write_guest_lock(kvm, ptr, &val, dte_esz);
}
/**
@ -2246,7 +2246,7 @@ static int vgic_its_save_cte(struct vgic_its *its,
((u64)collection->target_addr << KVM_ITS_CTE_RDBASE_SHIFT) |
collection->collection_id);
val = cpu_to_le64(val);
return kvm_write_guest(its->dev->kvm, gpa, &val, esz);
return kvm_write_guest_lock(its->dev->kvm, gpa, &val, esz);
}
static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
@ -2317,7 +2317,7 @@ static int vgic_its_save_collection_table(struct vgic_its *its)
*/
val = 0;
BUG_ON(cte_esz > sizeof(val));
ret = kvm_write_guest(its->dev->kvm, gpa, &val, cte_esz);
ret = kvm_write_guest_lock(its->dev->kvm, gpa, &val, cte_esz);
return ret;
}

4
virt/kvm/arm/vgic/vgic-v3.c
View File

@ -358,7 +358,7 @@ int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq)
if (status) {
/* clear consumed data */
val &= ~(1 << bit_nr);
ret = kvm_write_guest(kvm, ptr, &val, 1);
ret = kvm_write_guest_lock(kvm, ptr, &val, 1);
if (ret)
return ret;
}
@ -409,7 +409,7 @@ int vgic_v3_save_pending_tables(struct kvm *kvm)
else
val &= ~(1 << bit_nr);
ret = kvm_write_guest(kvm, ptr, &val, 1);
ret = kvm_write_guest_lock(kvm, ptr, &val, 1);
if (ret)
return ret;
}