3.16.65-rc1 review patch. If anyone has any objections, please let me know.
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From: Christoffer Dall christoffer.dall@arm.com
commit fb544d1ca65a89f7a3895f7531221ceeed74ada7 upstream.
We recently addressed a VMID generation race by introducing a read/write lock around accesses and updates to the vmid generation values.
However, kvm_arch_vcpu_ioctl_run() also calls need_new_vmid_gen() but does so without taking the read lock.
As far as I can tell, this can lead to the same kind of race:
VM 0, VCPU 0 VM 0, VCPU 1 ------------ ------------ update_vttbr (vmid 254) update_vttbr (vmid 1) // roll over read_lock(kvm_vmid_lock); force_vm_exit() local_irq_disable need_new_vmid_gen == false //because vmid gen matches
enter_guest (vmid 254) kvm_arch.vttbr = <PGD>:<VMID 1> read_unlock(kvm_vmid_lock);
enter_guest (vmid 1)
Which results in running two VCPUs in the same VM with different VMIDs and (even worse) other VCPUs from other VMs could now allocate clashing VMID 254 from the new generation as long as VCPU 0 is not exiting.
Attempt to solve this by making sure vttbr is updated before another CPU can observe the updated VMID generation.
Fixes: f0cf47d939d0 "KVM: arm/arm64: Close VMID generation race" Reviewed-by: Julien Thierry julien.thierry@arm.com Signed-off-by: Christoffer Dall christoffer.dall@arm.com Signed-off-by: Marc Zyngier marc.zyngier@arm.com [bwh: Backported to 3.16: - Use ACCESS_ONCE() instead of {READ,WRITE}_ONCE() - Adjust filename] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- arch/arm/kvm/arm.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-)
--- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -59,7 +59,7 @@ static DEFINE_PER_CPU(struct kvm_vcpu *, /* The VMID used in the VTTBR */ static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); static u8 kvm_next_vmid; -static DEFINE_RWLOCK(kvm_vmid_lock); +static DEFINE_SPINLOCK(kvm_vmid_lock);
static bool vgic_present;
@@ -376,7 +376,9 @@ void force_vm_exit(const cpumask_t *mask */ static bool need_new_vmid_gen(struct kvm *kvm) { - return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); + u64 current_vmid_gen = atomic64_read(&kvm_vmid_gen); + smp_rmb(); /* Orders read of kvm_vmid_gen and kvm->arch.vmid */ + return unlikely(ACCESS_ONCE(kvm->arch.vmid_gen) != current_vmid_gen); }
/** @@ -391,16 +393,11 @@ static void update_vttbr(struct kvm *kvm { phys_addr_t pgd_phys; u64 vmid; - bool new_gen;
- read_lock(&kvm_vmid_lock); - new_gen = need_new_vmid_gen(kvm); - read_unlock(&kvm_vmid_lock); - - if (!new_gen) + if (!need_new_vmid_gen(kvm)) return;
- write_lock(&kvm_vmid_lock); + spin_lock(&kvm_vmid_lock);
/* * We need to re-check the vmid_gen here to ensure that if another vcpu @@ -408,7 +405,7 @@ static void update_vttbr(struct kvm *kvm * use the same vmid. */ if (!need_new_vmid_gen(kvm)) { - write_unlock(&kvm_vmid_lock); + spin_unlock(&kvm_vmid_lock); return; }
@@ -431,7 +428,6 @@ static void update_vttbr(struct kvm *kvm kvm_call_hyp(__kvm_flush_vm_context); }
- kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); kvm->arch.vmid = kvm_next_vmid; kvm_next_vmid++;
@@ -441,7 +437,10 @@ static void update_vttbr(struct kvm *kvm vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK; kvm->arch.vttbr = pgd_phys | vmid;
- write_unlock(&kvm_vmid_lock); + smp_wmb(); + ACCESS_ONCE(kvm->arch.vmid_gen) = atomic64_read(&kvm_vmid_gen); + + spin_unlock(&kvm_vmid_lock); }
static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)