linux-kernel - Re: [patch] kvm: fix GFP_KERNEL allocation in atomic section in kvm_dev_ioctl_create

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Message-ID: <4593BEE6.30206@qumranet.com>
Date:	Thu, 28 Dec 2006 14:56:06 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [patch] kvm: fix GFP_KERNEL allocation in atomic section in kvm_dev_ioctl_create_vcpu()

Ingo Molnar wrote:
> Subject: [patch] kvm: fix GFP_KERNEL allocation in atomic section in kvm_dev_ioctl_create_vcpu()
> From: Ingo Molnar <mingo@...e.hu>
>
> fix a GFP_KERNEL allocation in atomic section bug: 
> kvm_dev_ioctl_create_vcpu() called kvm_mmu_init(), which calls 
> alloc_pages(), while holding the vcpu. The fix is to set up the MMU 
> state earlier, it does not require a loaded CPU state.
>   

Yes it does.  It calls nonpaging_init_context() which calls 
vmx_set_cr3() which promptly trashes address space of the VM that 
previously ran on that vcpu (or, if there were none, logs a vmwrite error).

-- 
error compiling committee.c: too many arguments to function

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