linux-kernel - Re: [PATCH v3 0/5] x86: SME: BSP/SME microcode update fix

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Date:   Wed, 10 Jan 2018 22:14:53 +0100
From:   Gabriel C <nix.or.die@...il.com>
To:     Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org
Cc:     Brijesh Singh <brijesh.singh@....com>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 0/5] x86: SME: BSP/SME microcode update fix

On 10.01.2018 20:25, Tom Lendacky wrote:

Hi Tom ,

> This patch series addresses an issue when SME is active and the BSP
> is attempting to check for and load microcode during load_ucode_bsp().
> Since the initrd has not been decrypted (yet) and the virtual address
> of the initrd treats the memory as encrypted, the CPIO archive parsing
> fails to locate the microcode.
> 
> This series moves the encryption of the initrd into the early boot code
> and encrypts it at the same time that the kernel is encrypted.  Since
> the initrd is now encrypted, the CPIO archive parsing succeeds in
> properly locating the microcode.
> 
> The following patches are included in this fix:
> - Cleanup register saving in arch/x86/mm/mem_encrypt_boot.S
> - Reduce parameters and complexity for creating the SME PGD mappings
> - Centralize the use of the PMD flags used in sme_encrypt_kernel() in
>    preparation for using PTE flags also.
> - Prepare sme_encrypt_kernel() to handle PAGE aligned encryption, not
>    just 2MB large page aligned encryption.
> - Encrypt the initrd in sme_encrypt_kernel() when the kernel is being
>    encrypted.
> 
> This patch series is based on tip/master.

Is something in tip/master the patch serie need ?

I would like to test the serie however tip/master
breaks my box.. On tip/master there is no way to boot
with mem_crypt=on with or without your patches.

With mem_crypt=off the box at least boots to a point , seems APCI breaks on tip/master.

If someone want to take a look , a dmesg of the broken boot can be found there:

http://sigsegv.24-7.ro/~crazy/tip-master/dmesg-tip-master.txt

Regards,

Gabriel C