Messages in this thread | | | Subject | Re: [RFC v2-fix-v3 1/1] x86/tdx: Skip WBINVD instruction for TDX guest | From | Dave Hansen <> | Date | Tue, 8 Jun 2021 16:38:22 -0700 |
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On 6/8/21 4:32 PM, Dan Williams wrote: >> Persistent memory is also currently not supported. Another code >> path that uses WBINVD is the MTRR driver, but EPT/virtualization >> always disables MTRRs so those are not needed. This all implies >> WBINVD is not needed with current TDX. > Let's drop the last three paragraphs and just say something like: > "This is one of a series of patches to usages of wbinvd for protected > guests. For now this just addresses the one known path that TDX > executes, ACPI reboot. Its usage can be elided because FOO reason and > all the other ACPI_FLUSH_CPU_CACHE usages can be elided because BAR > reason"
A better effort at transparency can be made here:
This patches the one WBINVD instance which has been encountered in practice: ACPI reboot. Assume no other instance will be encountered.
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