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From: "Nikunj A. Dadhania" <nikunj@amd.com>
To: Dionna Amalie Glaze <dionnaglaze@google.com>
Cc: linux-kernel@vger.kernel.org, thomas.lendacky@amd.com,
	x86@kernel.org, kvm@vger.kernel.org, bp@alien8.de,
	mingo@redhat.com, tglx@linutronix.de,
	dave.hansen@linux.intel.com, pgonda@google.com,
	seanjc@google.com, pbonzini@redhat.com
Subject: Re: [PATCH v7 00/16] Add Secure TSC support for SNP guests
Date: Sat, 27 Jan 2024 09:40:41 +0530	[thread overview]
Message-ID: <ebd90e46-d2ac-48ed-8d7e-ffc8a221140f@amd.com> (raw)
In-Reply-To: <CAAH4kHZ8TWbWtf2_2DjEQosO8M08wD-EvaEsBKrXmPUaiFg+ug@mail.gmail.com>

On 1/26/2024 6:30 AM, Dionna Amalie Glaze wrote:
> On Wed, Jan 24, 2024 at 10:08 PM Nikunj A. Dadhania <nikunj@amd.com> wrote:
>>
>> On 12/20/2023 8:43 PM, Nikunj A Dadhania wrote:
>>> Secure TSC allows guests to securely use RDTSC/RDTSCP instructions as the
>>> parameters being used cannot be changed by hypervisor once the guest is
>>> launched. More details in the AMD64 APM Vol 2, Section "Secure TSC".
>>>
>>> During the boot-up of the secondary cpus, SecureTSC enabled guests need to
>>> query TSC info from AMD Security Processor. This communication channel is
>>> encrypted between the AMD Security Processor and the guest, the hypervisor
>>> is just the conduit to deliver the guest messages to the AMD Security
>>> Processor. Each message is protected with an AEAD (AES-256 GCM). See "SEV
>>> Secure Nested Paging Firmware ABI Specification" document (currently at
>>> https://www.amd.com/system/files/TechDocs/56860.pdf) section "TSC Info"
>>>
>>> Use a minimal GCM library to encrypt/decrypt SNP Guest messages to
>>> communicate with the AMD Security Processor which is available at early
>>> boot.
>>>
>>> SEV-guest driver has the implementation for guest and AMD Security
>>> Processor communication. As the TSC_INFO needs to be initialized during
>>> early boot before smp cpus are started, move most of the sev-guest driver
>>> code to kernel/sev.c and provide well defined APIs to the sev-guest driver
>>> to use the interface to avoid code-duplication.
>>>
>>> Patches:
>>> 01-08: Preparation and movement of sev-guest driver code
>>> 09-16: SecureTSC enablement patches.
>>>
>>> Testing SecureTSC
>>> -----------------
>>>
>>> SecureTSC hypervisor patches based on top of SEV-SNP Guest MEMFD series:
>>> https://github.com/nikunjad/linux/tree/snp-host-latest-securetsc_v5
>>>
>>> QEMU changes:
>>> https://github.com/nikunjad/qemu/tree/snp_securetsc_v5
>>>
>>> QEMU commandline SEV-SNP-UPM with SecureTSC:
>>>
>>>   qemu-system-x86_64 -cpu EPYC-Milan-v2,+secure-tsc,+invtsc -smp 4 \
>>>     -object memory-backend-memfd-private,id=ram1,size=1G,share=true \
>>>     -object sev-snp-guest,id=sev0,cbitpos=51,reduced-phys-bits=1,secure-tsc=on \
>>>     -machine q35,confidential-guest-support=sev0,memory-backend=ram1,kvm-type=snp \
>>>     ...
>>>
>>> Changelog:
>>> ----------
>>> v7:
>>> * Drop mutex from the snp_dev and add snp_guest_cmd_{lock,unlock} API
>>> * Added comments for secrets page failure
>>> * Added define for maximum supported VMPCK
>>> * Updated comments why sev_status is used directly instead of
>>>   cpu_feature_enabled()

I missed this in the change log:

    * Added Tested-by from Peter Gonda (https://lore.kernel.org/lkml/CAMkAt6pULjLVUO6Ys4Sq1a79d93_5w5URgLYNXY-aW2jSemruA@mail.gmail.com/)
>>
>> A gentle reminder.
>>
> 
> From the Google testing side of things, we may not get to this for
> another while.

Thanks Dionna 

Regards
Nikunj



      reply	other threads:[~2024-01-27  4:10 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-20 15:13 [PATCH v7 00/16] Add Secure TSC support for SNP guests Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 01/16] virt: sev-guest: Use AES GCM crypto library Nikunj A Dadhania
2024-01-25 10:36   ` Borislav Petkov
2024-01-27  3:54     ` Nikunj A. Dadhania
2023-12-20 15:13 ` [PATCH v7 02/16] virt: sev-guest: Replace dev_dbg with pr_debug Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 03/16] virt: sev-guest: Add SNP guest request structure Nikunj A Dadhania
2024-01-25 11:59   ` Borislav Petkov
2024-01-27  4:01     ` Nikunj A. Dadhania
2024-01-31 13:58     ` Nikunj A. Dadhania
2024-02-01 10:29       ` Borislav Petkov
2024-02-01 11:10         ` Nikunj A. Dadhania
2024-02-01 14:07           ` Borislav Petkov
2024-02-02  3:50             ` Nikunj A. Dadhania
2024-02-02 16:14               ` Borislav Petkov
2024-02-05  9:23                 ` Nikunj A. Dadhania
2024-02-06 10:04                   ` Borislav Petkov
2024-01-26 21:16   ` Tom Lendacky
2024-01-27  4:05     ` Nikunj A. Dadhania
2023-12-20 15:13 ` [PATCH v7 04/16] virt: sev-guest: Add vmpck_id to snp_guest_dev struct Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 05/16] x86/sev: Cache the secrets page address Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 06/16] virt: sev-guest: Move SNP Guest command mutex Nikunj A Dadhania
2024-01-26 22:11   ` Tom Lendacky
2024-01-27  4:06     ` Nikunj A. Dadhania
2023-12-20 15:13 ` [PATCH v7 07/16] x86/sev: Move and reorganize sev guest request api Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 08/16] x86/mm: Add generic guest initialization hook Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 09/16] x86/cpufeatures: Add synthetic Secure TSC bit Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 10/16] x86/sev: Add Secure TSC support for SNP guests Nikunj A Dadhania
2024-02-01 15:46   ` Paolo Bonzini
2024-02-01 15:48     ` Paolo Bonzini
2023-12-20 15:13 ` [PATCH v7 11/16] x86/sev: Change TSC MSR behavior for Secure TSC enabled guests Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 12/16] x86/sev: Prevent RDTSC/RDTSCP interception " Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 13/16] x86/kvmclock: Skip kvmclock when Secure TSC is available Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 14/16] x86/sev: Mark Secure TSC as reliable Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 15/16] x86/cpu/amd: Do not print FW_BUG for Secure TSC Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 16/16] x86/sev: Enable Secure TSC for SNP guests Nikunj A Dadhania
2024-01-25  6:08 ` [PATCH v7 00/16] Add Secure TSC support " Nikunj A. Dadhania
2024-01-26  1:00   ` Dionna Amalie Glaze
2024-01-27  4:10     ` Nikunj A. Dadhania [this message]

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