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Re: [PATCH 1/6] x86/prot-key: Enumeration for Protection Key Supervisor
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 21 Dec 2021 12:15:13 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 21 Dec 2021 11:15:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.12.2021 10:54, Andrew Cooper wrote:
> Protection Key Supervisor works in a very similar way to Protection Key User,
> except that instead of a PKRU register used by the {RD,WR}PKRU instructions,
> the supervisor protection settings live in MSR_PKRS and is accessed using
> normal {RD,WR}MSR instructions.
>
> PKS has the same problematic interactions with PV guests as PKU (more infact,
> given the guest kernel's CPL), so we'll only support this for HVM guests for
> now.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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