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Commit 395c6b0a authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Disable interrupts around get_kernel_ns() 



get_kernel_ns() wants preemption disabled.  It doesn't make a lot of sense
during the get/set ioctls (no way to make them non-racy) but the callee wants
it.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 7ebaf15e

arch/x86/kvm/x86.c

+4 −0
Original line number Diff line number Diff line
@@ -3469,8 +3469,10 @@ long kvm_arch_vm_ioctl(struct file *filp, 
			goto out;



		r = 0;

		local_irq_disable();

		now_ns = get_kernel_ns();

		delta = user_ns.clock - now_ns;

		local_irq_enable();

		kvm->arch.kvmclock_offset = delta;

		break;

	}
@@ -3478,8 +3480,10 @@ long kvm_arch_vm_ioctl(struct file *filp, 
		struct kvm_clock_data user_ns;

		u64 now_ns;



		local_irq_disable();

		now_ns = get_kernel_ns();

		user_ns.clock = kvm->arch.kvmclock_offset + now_ns;

		local_irq_enable();

		user_ns.flags = 0;



		r = -EFAULT;