linux-kernel - Re: [PATCH v9 09/19] x86: Secure Launch kernel late boot stub

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Date: Tue, 4 Jun 2024 14:17:01 -0700
From: ross.philipson@...cle.com
To: Jarkko Sakkinen <jarkko@...nel.org>, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-integrity@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-crypto@...r.kernel.org,
        kexec@...ts.infradead.org, linux-efi@...r.kernel.org,
        iommu@...ts.linux-foundation.org
Cc: dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, dave.hansen@...ux.intel.com,
        ardb@...nel.org, mjg59@...f.ucam.org,
        James.Bottomley@...senpartnership.com, peterhuewe@....de, jgg@...pe.ca,
        luto@...capital.net, nivedita@...m.mit.edu,
        herbert@...dor.apana.org.au, davem@...emloft.net, corbet@....net,
        ebiederm@...ssion.com, dwmw2@...radead.org, baolu.lu@...ux.intel.com,
        kanth.ghatraju@...cle.com, andrew.cooper3@...rix.com,
        trenchboot-devel@...glegroups.com, ross.philipson@...cle.com
Subject: Re: [PATCH v9 09/19] x86: Secure Launch kernel late boot stub

On 6/4/24 12:59 PM, Jarkko Sakkinen wrote:
> On Fri May 31, 2024 at 4:03 AM EEST, Ross Philipson wrote:
>> The routine slaunch_setup is called out of the x86 specific setup_arch()
>> routine during early kernel boot. After determining what platform is
>> present, various operations specific to that platform occur. This
>> includes finalizing setting for the platform late launch and verifying
>> that memory protections are in place.
>>
>> For TXT, this code also reserves the original compressed kernel setup
>> area where the APs were left looping so that this memory cannot be used.
>>
>> Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
>> ---
>>   arch/x86/kernel/Makefile   |   1 +
>>   arch/x86/kernel/setup.c    |   3 +
>>   arch/x86/kernel/slaunch.c  | 525 +++++++++++++++++++++++++++++++++++++
>>   drivers/iommu/intel/dmar.c |   4 +
>>   4 files changed, 533 insertions(+)
>>   create mode 100644 arch/x86/kernel/slaunch.c
>>
>> diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
>> index 5d128167e2e2..b35ca99ab0a0 100644
>> --- a/arch/x86/kernel/Makefile
>> +++ b/arch/x86/kernel/Makefile
>> @@ -76,6 +76,7 @@ obj-$(CONFIG_X86_32)		+= tls.o
>>   obj-$(CONFIG_IA32_EMULATION)	+= tls.o
>>   obj-y				+= step.o
>>   obj-$(CONFIG_INTEL_TXT)		+= tboot.o
>> +obj-$(CONFIG_SECURE_LAUNCH)	+= slaunch.o
> 
> Hmm... should that be CONFIG_X86_SECURE_LAUNCH?
> 
> Just asking...

It could be if you would like. I guess we just thought it was implied 
given its location.

Ross

> 
> BR, Jarkko
>