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Re: [Xen-devel] [PATCH] x86 spinlock: Fix memory corruption on completing completions
- To: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Mon, 9 Feb 2015 13:02:27 +0100
- Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, kvm@xxxxxxxxxxxxxxx, jasowang@xxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, paul.gortmaker@xxxxxxxxxxxxx, hpa@xxxxxxxxx, ak@xxxxxxxxxxxxxxx, a.ryabinin@xxxxxxxxxxx, x86@xxxxxxxxxx, borntraeger@xxxxxxxxxx, mingo@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, paulmck@xxxxxxxxxxxxxxxxxx, sasha.levin@xxxxxxxxxx, davej@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, waiman.long@xxxxxx, oleg@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, pbonzini@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 09 Feb 2015 12:02:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Mon, Feb 09, 2015 at 03:04:22PM +0530, Raghavendra K T wrote:
> So we have 3 choices,
> 1. xadd
> 2. continue with current approach.
> 3. a read before unlock and also after that.
For the truly paranoid we have probe_kernel_address(), suppose the lock
was in module space and the module just got unloaded under us.
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