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Re: [PATCH v1 08/40] i386/tdx: Adjust the supported CPUID based on TDX r
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From: |
Gerd Hoffmann |
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Subject: |
Re: [PATCH v1 08/40] i386/tdx: Adjust the supported CPUID based on TDX restrictions |
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Date: |
Thu, 25 Aug 2022 13:26:47 +0200 |
Hi,
> between VMM and TDs. Adjust supported CPUID for TDs based on TDX
> restrictions.
Automatic adjustment depending on hardware capabilities isn't going to
fly long-term, you'll run into compatibility problems sooner or later,
for example when different hardware with diverging capabilities (first
vs. second TDX generation) leads to different CPUID capsets in a
otherwise identical configuration.
Verification should happen of course, but I think qemu should just throw
an error in case the tdx can't support a given cpu configuration.
(see also Daniels reply to the cover letter).
take care,
Gerd
- [PATCH v1 05/40] i386/tdx: Implement tdx_kvm_init() to initialize TDX VM context, (continued)
- [PATCH v1 05/40] i386/tdx: Implement tdx_kvm_init() to initialize TDX VM context, Xiaoyao Li, 2022/08/02
- [PATCH v1 06/40] i386/tdx: Get tdx_capabilities via KVM_TDX_CAPABILITIES, Xiaoyao Li, 2022/08/02
- [PATCH v1 07/40] i386/tdx: Introduce is_tdx_vm() helper and cache tdx_guest object, Xiaoyao Li, 2022/08/02
- [PATCH v1 08/40] i386/tdx: Adjust the supported CPUID based on TDX restrictions, Xiaoyao Li, 2022/08/02
- [PATCH v1 09/40] i386/tdx: Update tdx_fixed0/1 bits by tdx_caps.cpuid_config[], Xiaoyao Li, 2022/08/02
- [PATCH v1 12/40] i386/kvm: Move architectural CPUID leaf generation to separate helper, Xiaoyao Li, 2022/08/02
- [PATCH v1 10/40] i386/tdx: Integrate tdx_caps->xfam_fixed0/1 into tdx_cpuid_lookup, Xiaoyao Li, 2022/08/02
- [PATCH v1 11/40] i386/tdx: Integrate tdx_caps->attrs_fixed0/1 to tdx_cpuid_lookup, Xiaoyao Li, 2022/08/02
- [PATCH v1 13/40] KVM: Introduce kvm_arch_pre_create_vcpu(), Xiaoyao Li, 2022/08/02
- [PATCH v1 14/40] i386/tdx: Initialize TDX before creating TD vcpus, Xiaoyao Li, 2022/08/02
- [PATCH v1 15/40] i386/tdx: Add property sept-ve-disable for tdx-guest object, Xiaoyao Li, 2022/08/02