[Bug 218267] [Sapphire Rapids][Upstream]Boot up multiple Windows VMs hang

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218267

--- Comment #7 from Chao Gao (chao.gao@intel.com) ---
Hi Maxim,

I was told the erratum writeup and microcode fix would be released this month.

I just checked the microcode release
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/releases.
The microcode fix hasn't been released yet, but the erratum is already in
SPR/EMR specification. e.g., for SPR,

SPR141. VM Exit Following MOV to CR8 Instruction May Lead to Unexpected
IDT Vectoring-Information
Problem: Under certain conditions, a VM exit following execution of the MOV to
CR8
instruction may unexpectedly result in setting the Valid bit (bit 31) of the
IDTVectoring Information Field in the Virtual Machine Control Structure (VMCS).
Implication: Depending on the operation of the virtual-machine monitor (VMM),
this
may result in unexpected VM behavior.
Workaround: It may be possible for the BIOS to contain a workaround for this
erratum

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