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Re: [Xen-devel] [PATCH 1/6] x86emul: generalize wbinvd() hook
- To: Jan Beulich <JBeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 27 Aug 2019 13:51:02 +0100
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- Cc: Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, RogerPau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 27 Aug 2019 12:51:22 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 27/08/2019 11:44, Andrew Cooper wrote:
>> I was also uncertain about the new cache_flush_permitted() instance -
>> generally I think it wouldn't be too bad if we allowed line flushes in
>> all cases, in which case the checks in the ->wbinvd_intercept() handlers
>> would suffice (as they did until now).
> This is a more general issue which we need to address. To support
> encrypted memory in VM's, we must guarantee that WC mappings which the
> guest creates are really WC, which means we must not use IPAT or play
> any "fall back to WB" games.
>
> Furthermore, AMD's encrypt-in-place algorithm requires the guest to be
> able to use WBINVD.
Apologies. AMD's algorithm requires aliased WP and WB mappings, not WC.
~Andrew
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