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xen-devel
[Xen-devel] Re: [PATCH] x86/cpa: make sure cpa is safe to call in lazy m
* Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> [ Ingo, this needs to go upstream and -stable. -J ]
>
> commit 2193cee29f66b873b9f8ac2cebb2c7b755ec73a3
> Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
> Date: Tue Feb 10 14:15:52 2009 -0800
>
> x86/cpa: make sure cpa is safe to call in lazy mmu mode
> Impact: fix race leading to crash under KVM and Xen
>
> The CPA code may be called while we're in lazy mmu update mode - for
> example, when using DEBUG_PAGE_ALLOC and doing a slab allocation
> in an interrupt handler which interrupted a lazy mmu update. In this
> case, the in-memory pagetable state may be out of date due to pending
> queued updates. We need to flush any pending updates before inspecting
> the page table. Similarly, we must explicitly flush any modifications
> CPA may have made (which comes down to flushing queued operations when
> flushing the TLB).
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
> Acked-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
applied to tip:x86/urgent, thanks Jeremy!
Ingo
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