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authorNikunj A Dadhania <nikunj@amd.com>2025-08-19 16:48:33 -0700
committerSean Christopherson <seanjc@google.com>2025-08-21 08:51:39 -0700
commita311fce2b694599cede76c5d7a0905336bc09803 (patch)
tree298dcc20a56061777fc8e2225a10a39c2dc925f1 /scripts/bash-completion
parentf7b1f0c1620db689e085569035a659340a3209c3 (diff)
KVM: SVM: Enable Secure TSC for SNP guests
Add support for Secure TSC, allowing userspace to configure the Secure TSC feature for SNP guests. Use the SNP specification's desired TSC frequency parameter during the SNP_LAUNCH_START command to set the mean TSC frequency in KHz for Secure TSC enabled guests. Always use kvm->arch.arch.default_tsc_khz as the TSC frequency that is passed to SNP guests in the SNP_LAUNCH_START command. The default value is the host TSC frequency. The userspace can optionally change the TSC frequency via the KVM_SET_TSC_KHZ ioctl before calling the SNP_LAUNCH_START ioctl. Introduce the read-only MSR GUEST_TSC_FREQ (0xc0010134) that returns guest's effective frequency in MHZ when Secure TSC is enabled for SNP guests. Disable interception of this MSR when Secure TSC is enabled. Note that GUEST_TSC_FREQ MSR is accessible only to the guest and not from the hypervisor context. Co-developed-by: Ketan Chaturvedi <Ketan.Chaturvedi@amd.com> Signed-off-by: Ketan Chaturvedi <Ketan.Chaturvedi@amd.com> Reviewed-by: Kai Huang <kai.huang@intel.com> Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Nikunj A Dadhania <nikunj@amd.com> [sean: contain Secure TSC to sev.c] Link: https://lore.kernel.org/r/20250819234833.3080255-9-seanjc@google.com [sean: return -EINVAL if TSC frequency is '0'] Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'scripts/bash-completion')
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