Re: [Xen-devel] [PATCH v3 1/2] x86: Meltdown band-aid against malicious 64-bit PV guests

[Andy Smith <andy@xxxxxxxxxxxxxx>]

Hi Jan,

On Tue, Jan 16, 2018 at 08:21:52AM -0700, Jan Beulich wrote:
> This is a very simplistic change limiting the amount of memory a running
> 64-bit PV guest has mapped (and hence available for attacking): Only the
> mappings of stack, IDT, and TSS are being cloned from the direct map
> into per-CPU page tables.

Can this be used with Comet/Vixen to further protect PV guests? i.e.
if the shim hypervisor has these changes then will it also limit
what a process in the PV guest can see in that shim hypervisor,
which therefore protects its own guest kernel a bit too?

Thanks,
Andy

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