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KVM: Disable pagefaults during copy_from_user_inatomic()

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With CONFIG_PREEMPT=n, this is needed in order to disable the fault-in
code from sleeping.

Signed-off-by: Andrea Arcangeli <andrea@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Andrea Arcangeli
2008-01-30 19:57:35 +01:00
committed by Avi Kivity
parent 31bb117eb4
commit 0aac03f07b
1 changed files with 2 additions and 0 deletions
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virt/kvm/kvm_main.c
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@@ -554,7 +554,9 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
addr = gfn_to_hva(kvm, gfn); addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr)) if (kvm_is_error_hva(addr))
return -EFAULT; return -EFAULT;
pagefault_disable();
r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
pagefault_enable();
if (r) if (r)
return -EFAULT; return -EFAULT;
return 0; return 0;