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Re: [PATCH v1 15/40] i386/tdx: Add property sept-ve-disable for tdx-gues
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From: |
Gerd Hoffmann |
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Subject: |
Re: [PATCH v1 15/40] i386/tdx: Add property sept-ve-disable for tdx-guest object |
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Date: |
Thu, 25 Aug 2022 13:36:36 +0200 |
On Tue, Aug 02, 2022 at 03:47:25PM +0800, Xiaoyao Li wrote:
> Bit 28, named SEPT_VE_DISABLE, disables EPT violation conversion to #VE
> on guest TD access of PENDING pages when set to 1. Some guest OS (e.g.,
> Linux TD guest) may require this bit set as 1. Otherwise refuse to boot.
--verbose please. That somehow doesn't make sense to me.
A guest is either TDX-aware (which should be the case for linux 5.19+),
or it is not. My expectation would be that guests which are not
TDX-aware will be disturbed by any #VE exception, not only the ones
triggered by EPT violations. So I'm wondering what this config bit
actually is useful for ...
take care,
Gerd
- Re: [PATCH v1 08/40] i386/tdx: Adjust the supported CPUID based on TDX restrictions, (continued)
- [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
- Re: [PATCH v1 15/40] i386/tdx: Add property sept-ve-disable for tdx-guest object,
Gerd Hoffmann <=
- [PATCH v1 16/40] i386/tdx: Wire CPU features up with attributes of TD guest, Xiaoyao Li, 2022/08/02
- [PATCH v1 17/40] i386/tdx: Validate TD attributes, Xiaoyao Li, 2022/08/02
- [PATCH v1 18/40] i386/tdx: Implement user specified tsc frequency, Xiaoyao Li, 2022/08/02
- [PATCH v1 19/40] i386/tdx: Set kvm_readonly_mem_enabled to false for TDX VM, Xiaoyao Li, 2022/08/02
- [PATCH v1 20/40] i386/tdvf: Introduce function to parse TDVF metadata, Xiaoyao Li, 2022/08/02