Re: [Xen-devel] Xen 4.0.0x allows for data corruption in Dom0

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 09/03/2010 10:15, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>>>> "Jan Beulich" <JBeulich@xxxxxxxxxx> 09.03.10 10:37 >>>
>> How about these being vcpu_time_info structures? The fields
>> appear to all make sense. The only thing not matching this would
>> be a few differently looking corruption entries sent earlier by Joanna,
>> so this may not be the only thing. But it would explain why with 3.4.2
>> the issue is not present.
> 
> In particular I think the update_vcpu_system_time() invocation
> in schedule() isn't right - VCPUOP_register_vcpu_time_memory_area
> taking a virtual address, this call must not happen before
> context_switch().
> 
> And btw., 32-on-64 also seems to be broken for
> VCPUOP_register_vcpu_time_memory_area (since 64-bit Xen reads
> the full 64-bit field).

Yeah, agreed. We'll stub it out for 4.0.0 I think. Things work quite okay
without it.

 -- Keir



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