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Date: Mon, 31 Mar 2008 17:36:59 +0300 From: Avi Kivity <avi@...ranet.com> To: kvm-devel@...ts.sourceforge.net Cc: linux-kernel@...r.kernel.org, Andrea Arcangeli <andrea@...ranet.com> Subject: [PATCH 15/40] KVM: Disable pagefaults during copy_from_user_inatomic() From: Andrea Arcangeli <andrea@...ranet.com> With CONFIG_PREEMPT=n, this is needed in order to disable the fault-in code from sleeping. Signed-off-by: Andrea Arcangeli <andrea@...ranet.com> Signed-off-by: Avi Kivity <avi@...ranet.com> --- virt/kvm/kvm_main.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7972e3a..cf6df51 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -554,7 +554,9 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, addr = gfn_to_hva(kvm, gfn); if (kvm_is_error_hva(addr)) return -EFAULT; + pagefault_disable(); r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); + pagefault_enable(); if (r) return -EFAULT; return 0; -- 1.5.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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