Re: [Xen-devel] [PATCH v2 01/30] xen/x86: move setup of the VM86 TSS to the domain builder

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.09.16 at 17:56, <roger.pau@xxxxxxxxxx> wrote:
> This is also required for PVHv2 guests if they want to use real-mode, and
> hvmloader is not executed for those kind of guests.

While the intention is fine, I'm not convinced of consuming yet another
special page here: Other than the way hvmloader's allocation works,
here you permanently take away a page from the guest unconditionally
which (a) is used only on VMX, (b) only on old hardware, and (c) VMX
code appears to even be able to help itself without this TSS (at the
price of doing more emulation).

Jan


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