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Re: [PATCH v2 6/9] x86/spec-ctrl: Use common MSR_SPEC_CTRL logic for AMD
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 31 Jan 2022 11:25:47 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 31 Jan 2022 10:25:56 +0000
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On 28.01.2022 14:29, Andrew Cooper wrote:
> Currently, amd_init_ssbd() works by being the only write to MSR_SPEC_CTRL in
> the system. This ceases to be true when using the common logic.
>
> Include AMD MSR_SPEC_CTRL in has_spec_ctrl to activate the common paths, and
> introduce an AMD specific block to control alternatives. Also update the
> boot/resume paths to configure default_xen_spec_ctrl.
>
> svm.h needs an adjustment to remove a dependency on include order.
>
> For now, only active alternatives for HVM - PV will require more work. No
> functional change, as no alternatives are defined yet for HVM yet.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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