Re: [Xen-devel] [PATCH v2] x86/VMX: sanitize VM86 TSS handling

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

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Friday, February 17, 2017 8:04 PM
> 
> The present way of setting this up is flawed: Leaving the I/O bitmap
> pointer at zero means that the interrupt redirection bitmap lives
> outside (ahead of) the allocated space of the TSS. Similarly setting a
> TSS limit of 255 when only 128 bytes get allocated means that 128 extra
> bytes may be accessed by the CPU during I/O port access processing.
> 
> Introduce a new HVM param to set the allocated size of the TSS, and
> have the hypervisor actually take care of setting namely the I/O bitmap
> pointer. Both this and the segment limit now take the allocated size
> into account.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

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

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