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Re: [Xen-devel] [PATCH v8 02/16] x86/microcode: always collect_cpu_info() during boot
- To: Chao Gao <chao.gao@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 1 Aug 2019 11:35:56 +0100
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- Cc: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Ashok Raj <ashok.raj@xxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 01 Aug 2019 10:36:09 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 01/08/2019 11:22, Chao Gao wrote:
> From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
>
> Currently cpu_sig struct is not updated during boot if no microcode blob
> is specified by "ucode=[<interger>| scan]".
>
> It will result in cpu_sig.rev being 0 which affects APIC's
> check_deadline_errata() and retpoline_safe() functions.
>
> Fix this by getting ucode revision early during boot and SMP bring up.
> While at it, protect early_microcode_update_cpu() for cases when
> microcode_ops is NULL.
>
> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
> Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
> ---
> Changes in v8:
> - refine description.
> - Jan asked if we could drop the call of collect_cpu_info() from
> microcode_update_cpu(). In theory, yes, but should be placed later
> in the series. Because there is an error path (__microcode_fini_cpu())
> in which cpu_sig.rev is cleared, it is hard to make things right
> in all cases without removing the error path (which is done by following
> patches). Considering it is a good fix, put it here so that it can
> be merged without following patches.
Ok.
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, and this does
really want backporting.
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