From: Ingo Molnar <mingo@elte.hu>
To: Avi Kivity <avi@qumranet.com>
Cc: kvm-devel <kvm-devel@lists.sourceforge.net>,
linux-kernel <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>
Subject: Re: [patch] kvm: fix GFP_KERNEL allocation in atomic section in kvm_dev_ioctl_create_vcpu()
Date: Thu, 28 Dec 2006 13:55:44 +0100 [thread overview]
Message-ID: <20061228125544.GA31207@elte.hu> (raw)
In-Reply-To: <4593BEE6.30206@qumranet.com>
* Avi Kivity <avi@qumranet.com> wrote:
> >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).
ok, i missed that. Nevertheless the problem of the nonatomic alloc
remains. I guess a kvm_mmu_init() needs to be split into
kvm_mmu_create() and kvm_mmu_setup()?
Ingo
next prev parent reply other threads:[~2006-12-28 12:58 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-28 10:07 [PATCH 0/8] KVM updates for 2.6.20-rc2 Avi Kivity
2006-12-28 10:08 ` [PATCH 1/8] KVM: Use boot_cpu_data instead of current_cpu_data Avi Kivity
2006-12-28 10:09 ` [PATCH 2/8] KVM: Simplify is_long_mode() Avi Kivity
2006-12-28 10:11 ` [PATCH 4/8] KVM: Implement a few system configuration msrs Avi Kivity
2007-01-01 0:07 ` Ingo Oeser
2007-01-01 8:20 ` Avi Kivity
2006-12-28 10:12 ` [PATCH 5/8] KVM: Move common msr handling to arch independent code Avi Kivity
2006-12-28 10:13 ` [PATCH 6/8] KVM: More msr misery Avi Kivity
2006-12-28 10:14 ` [PATCH 7/8] KVM: Rename some msrs Avi Kivity
2006-12-28 10:15 ` [PATCH 8/8] KVM: Fix oops on oom Avi Kivity
2006-12-28 12:42 ` [patch] kvm: fix GFP_KERNEL allocation in atomic section in kvm_dev_ioctl_create_vcpu() Ingo Molnar
2006-12-28 12:56 ` Avi Kivity
2006-12-28 12:55 ` Ingo Molnar [this message]
2006-12-28 13:08 ` [patch, try#2] " Ingo Molnar
2006-12-28 13:14 ` Avi Kivity
2006-12-28 13:23 ` Ingo Molnar
2006-12-28 13:30 ` Avi Kivity
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