Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH v3 0/5] x86: SME: BSP/SME microcode update fix
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Gabriel C <nix.or.die@gmail.com>, Borislav Petkov <bp@alien8.de>,
        x86@kernel.org, Brijesh Singh <brijesh.singh@amd.com>,
        linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Thomas Gleixner <tglx@linutronix.de>
References: <20180110192544.6026.17285.stgit@tlendack-t1.amdoffice.net>
 <20180111183313.7ub2t3xkeko5yb3z@pd.tnic>
 <68544677-2cbc-b41e-2db0-5799ef84d592@gmail.com>
 <b541ff4d-8131-ac09-1dbe-f549ceb47c6f@amd.com>
 <20180119151150.GB9033@kroah.com>
From:   Tom Lendacky <thomas.lendacky@amd.com>
Message-ID: <47ab23e7-c3e8-0edd-a7ac-019bd0e47a02@amd.com>
Date:   Fri, 19 Jan 2018 09:27:47 -0600
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101
 Thunderbird/52.5.2
MIME-Version: 1.0
In-Reply-To: <20180119151150.GB9033@kroah.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Received-SPF: None (protection.outlook.com: amd.com does not designate
 permitted sender hosts)
SpamDiagnosticOutput: 1:99
SpamDiagnosticMetadata: NSPM
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jan 2018 15:27:54.5655 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: a4f2f517-bc6b-46b3-a5a4-08d55f5136a0
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR12MB1144
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 1/19/2018 9:11 AM, Greg Kroah-Hartman wrote:
> On Fri, Jan 19, 2018 at 09:03:52AM -0600, Tom Lendacky wrote:
>> On 1/15/2018 4:47 PM, Gabriel C wrote:
>>> On 11.01.2018 19:33, Borislav Petkov wrote:
>>>> On Wed, Jan 10, 2018 at 01:25:45PM -0600, Tom Lendacky wrote:
>>>>> 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.
>>>>>
>>>>> ---
>>>>>
>>>>> Changes from v2:
>>>>> - General code cleanup based on feedback.
>>>>>
>>>>> Changes from v1:
>>>>> - Additional patch to cleanup the register saving performed in
>>>>>    arch/x86/mm/mem_encrypt_boot.S in prep for changes made in the
>>>>>    remainder of the patchset.
>>>>> - Additional patch to reduce parameters and complexity for creating the
>>>>>    SME PGD mappings by introducing and using a structure for referencing
>>>>>    the PGD to populate, the pagetable allocation area, the
>>>>> virtual/physical
>>>>>    addresses being mapped and the pagetable flags to be used.
>>>>> - Consolidate PMD/PTE mapping code to reduce duplication.
>>>>>
>>>>> Tom Lendacky (5):
>>>>>        x86/mm: Cleanup register saving in mem_encrypt_boot.S
>>>>>        x86/mm: Use a struct to reduce parameters for SME PGD mapping
>>>>>        x86/mm: Centralize PMD flags in sme_encrypt_kernel()
>>>>>        x86/mm: Prepare sme_encrypt_kernel() for PAGE aligned encryption
>>>>>        x86/mm: Encrypt the initrd earlier for BSP microcode update
>>>>>
>>>>>
>>>>>   arch/x86/include/asm/mem_encrypt.h |    4
>>>>>   arch/x86/kernel/head64.c           |    4
>>>>>   arch/x86/kernel/setup.c            |   10 -
>>>>>   arch/x86/mm/mem_encrypt.c          |  356
>>>>> ++++++++++++++++++++++++++----------
>>>>>   arch/x86/mm/mem_encrypt_boot.S     |   80 ++++----
>>>>>   5 files changed, 308 insertions(+), 146 deletions(-)
>>>>
>>>> All 5:
>>>>
>>>> Reviewed-by: Borislav Petkov <bp@suse.de>
>>>>
>>>
>>> Guys , are these patches going to be part of 4.15 ?
>>>
>>> With mem_encrypt=on without these patches microcode loading doesn't
>>> work right. Also @stable 4.14 would need the fixes too.
>>
>> It looks like these patches have been pulled into 4.15.  I did forget
>> to cc stable, so I'll follow-up with a separate email to have these
>> back-ported to the 4.14 stable tree.
> 
> What are the git commit ids?   That's all I need :)

Hi Greg,

Here are the commit ids:
  1303880179e6 (“x86/mm: Clean up register saving in the __enc_copy() assembly code”)
  bacf6b499e11 (“x86/mm: Use a struct to reduce parameters for SME PGD mapping”)
  2b5d00b6c2cd (“x86/mm: Centralize PMD flags in sme_encrypt_kernel()”)
  cc5f01e28d6c (“x86/mm: Prepare sme_encrypt_kernel() for PAGE aligned encryption”)
  107cd2532181 (“x86/mm: Encrypt the initrd earlier for BSP microcode update”)

The last commit won't apply cleanly on 4.14.  There was a change in
arch/x86/kernel/setup.c for SEV support.  The actual patch to that file
is very small it just removes the call to sme_early_encrypt() and the
associated comment.  I can submit a new version of that patch if you
want, just let me know.

Thanks Greg!

Tom

> 
> thanks,
> 
> greg k-h
>