From: "Nikunj A. Dadhania" <nikunj@amd.com>
To: "Huang, Kai" <kai.huang@intel.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"seanjc@google.com" <seanjc@google.com>
Cc: "thomas.lendacky@amd.com" <thomas.lendacky@amd.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"vaishali.thakkar@suse.com" <vaishali.thakkar@suse.com>,
"Ketan.Chaturvedi@amd.com" <Ketan.Chaturvedi@amd.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"michael.roth@amd.com" <michael.roth@amd.com>,
"bp@alien8.de" <bp@alien8.de>, <david.kaplan@amd.com>
Subject: Re: [PATCH v11 0/8] KVM: SVM: Enable Secure TSC for SEV-SNP
Date: Wed, 20 Aug 2025 17:00:39 +0530 [thread overview]
Message-ID: <0a2e3ae2-6459-46eb-a9a3-2cab284a49f7@amd.com> (raw)
In-Reply-To: <755ca898eab309445e461ee9f542ba7a4057d36c.camel@intel.com>
On 8/20/2025 4:55 PM, Huang, Kai wrote:
> On Wed, 2025-08-20 at 14:18 +0530, Nikunj A. Dadhania wrote:
>>> - Continue on with snp_launch_start() if default_tsc_khz is '0'. AFAICT,
>>> continuing on doesn't put the host at (any moer) risk. [Kai]
>>
>> If I hack default_tsc_khz as '0', SNP guest kernel with SecureTSC spits out
>> couple of warnings and finally panics:
>>
>
> It's a surprise that the SEV_CMD_SNP_LAUNCH_START didn't fail in such
> configuration. :-)
As mentioned here[1], this is an unsupported configuration as per the SNP
Firmware ABI.
Regards,
Nikunj
1. https://lore.kernel.org/all/c3e638e9-631f-47af-b0d2-06cea949ec1e@amd.com/
next prev parent reply other threads:[~2025-08-20 11:30 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-19 23:48 Sean Christopherson
2025-08-19 23:48 ` [PATCH v11 1/8] KVM: SEV: Drop GHCB_VERSION_DEFAULT and open code it Sean Christopherson
2025-08-19 23:48 ` [PATCH v11 2/8] KVM: SEV: Enforce minimum GHCB version requirement for SEV-SNP guests Sean Christopherson
2025-08-19 23:48 ` [PATCH v11 3/8] x86/cpufeatures: Add SNP Secure TSC Sean Christopherson
2025-08-19 23:48 ` [PATCH v11 4/8] KVM: SVM: Move SEV-ES VMSA allocation to a dedicated sev_vcpu_create() helper Sean Christopherson
2025-08-20 9:00 ` Nikunj A. Dadhania
2025-08-19 23:48 ` [PATCH v11 5/8] KVM: SEV: Move init of SNP guest state into sev_init_vmcb() Sean Christopherson
2025-08-20 9:21 ` Nikunj A. Dadhania
2025-08-19 23:48 ` [PATCH v11 6/8] KVM: SEV: Set RESET GHCB MSR value during sev_es_init_vmcb() Sean Christopherson
2025-08-20 9:32 ` Nikunj A. Dadhania
2025-08-19 23:48 ` [PATCH v11 7/8] KVM: SEV: Fold sev_es_vcpu_reset() into sev_vcpu_create() Sean Christopherson
2025-08-20 9:33 ` Nikunj A. Dadhania
2025-08-19 23:48 ` [PATCH v11 8/8] KVM: SVM: Enable Secure TSC for SNP guests Sean Christopherson
2025-08-20 4:53 ` Nikunj A. Dadhania
2025-08-20 13:01 ` Sean Christopherson
2025-08-20 13:11 ` Nikunj A. Dadhania
2025-08-20 8:48 ` [PATCH v11 0/8] KVM: SVM: Enable Secure TSC for SEV-SNP Nikunj A. Dadhania
2025-08-20 11:25 ` Huang, Kai
2025-08-20 11:30 ` Nikunj A. Dadhania [this message]
2025-08-20 15:10 ` Sean Christopherson
2025-08-21 21:35 ` Sean Christopherson
2025-08-25 5:37 ` Nikunj A. Dadhania
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