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Re: [PATCH v2 3/3] x86/ucode: load microcode earlier on boot CPU
- To: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 20 Dec 2022 15:07:23 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 20 Dec 2022 14:07:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.12.2022 15:45, Sergey Dyasli wrote:
> Call early_microcode_init() straight after multiboot modules become
> accessible. Modify it to load the ucode directly from the blob bypassing
> populating microcode_cache because xmalloc is still not available at
> that point during Xen boot.
>
> Introduce early_microcode_init_cache() for populating microcode_cache.
> It needs to rescan the modules in order to find the new virtual address
> of the ucode blob because it changes during the boot process, e.g.
> from 0x00000000010802fc to 0xffff83204dac52fc.
>
> While at it, drop alternative_vcall() from early_microcode_init() since
> it's not useful in an __init fuction.
>
> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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