Re: [Xen-devel] [PATCH v2] x86/vmx: correctly gather gs_shadow value for current vCPU

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Tamas K Lengyel [mailto:tamas@xxxxxxxxxxxxx]
> Sent: Thursday, May 2, 2019 7:52 AM
> 
> Currently the gs_shadow value is only cached when the vCPU is being
> scheduled
> out by Xen. Reporting this (usually) stale value through vm_event is 
> incorrect,
> since it doesn't represent the actual state of the vCPU at the time the event
> was recorded. This prevents vm_event subscribers from correctly finding
> kernel
> structures in the guest when it is trapped while in ring3.
> 
> Refresh shadow_gs value when the context being saved is for the current
> vCPU.
> 
> Signed-off-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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