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KVM: fix spectrev1 gadgets

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These were found with smatch, and then generalized when applicable.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2019-04-11 11:16:47 +02:00
parent be43c440eb
commit 1d487e9bf8
4 changed files with 16 additions and 9 deletions
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10
include/linux/kvm_host.h
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@@ -28,6 +28,7 @@
#include <linux/irqbypass.h>
#include <linux/swait.h>
#include <linux/refcount.h>
#include <linux/nospec.h>
#include <asm/signal.h>
#include <linux/kvm.h>
@@ -513,10 +514,10 @@ static inline struct kvm_io_bus *kvm_get_bus(struct kvm *kvm, enum kvm_bus idx)
static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
{
/* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu, in case
* the caller has read kvm->online_vcpus before (as is the case
* for kvm_for_each_vcpu, for example).
*/
int num_vcpus = atomic_read(&kvm->online_vcpus);
i = array_index_nospec(i, num_vcpus);
/* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu. */
smp_rmb();
return kvm->vcpus[i];
}
@@ -600,6 +601,7 @@ void kvm_put_kvm(struct kvm *kvm);
static inline struct kvm_memslots *__kvm_memslots(struct kvm *kvm, int as_id)
{
as_id = array_index_nospec(as_id, KVM_ADDRESS_SPACE_NUM);
return srcu_dereference_check(kvm->memslots[as_id], &kvm->srcu,
lockdep_is_held(&kvm->slots_lock) ||
!refcount_read(&kvm->users_count));