kvm: fix schedule in atomic in kvm_steal_time_set_preempted()

kvm_steal_time_set_preempted() isn't disabling the pagefaults before
calling __copy_to_user and the kernel debug notices.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 49da1064ef50..8ce1139a08b5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2844,7 +2844,17 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
 
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 {
+        /*
+         * Disable page faults because we're in atomic context here.
+         * kvm_write_guest_offset_cached() would call might_fault()
+         * that relies on pagefault_disable() to tell if there's a
+         * bug. NOTE: the write to guest memory may not go through if
+         * during postcopy live migration or if there's heavy guest
+         * paging.
+         */
+        pagefault_disable();
         kvm_steal_time_set_preempted(vcpu);
+        pagefault_enable();
         kvm_x86_ops->vcpu_put(vcpu);
         kvm_put_guest_fpu(vcpu);
         vcpu->arch.last_host_tsc = rdtsc();