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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 16/01/18 17:28, Andy Smith wrote:
> 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?

Yes.

~Andrew

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