[Bug 203543] Starting with kernel 5.1.0-rc6, kvm_intel can no longer be loaded in nested kvm/guests

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https://bugzilla.kernel.org/show_bug.cgi?id=203543

Liran Alon (liran.alon@xxxxxxxxxx) changed:

           What    |Removed                     |Added
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                 CC|                            |liran.alon@xxxxxxxxxx

--- Comment #1 from Liran Alon (liran.alon@xxxxxxxxxx) ---
If I would have to guess, I would blame my own commit:
e51bfdb68725 ("KVM: nVMX: Expose RDPMC-exiting only when guest supports PMU”)

As in kvm_intel’s setup_vmcs_config() it can be seen that
CPU_BASED_RDPMC_EXITING is required in order for KVM to load.
Therefore, I assume the issue is that now L1 guest is not exposed with
CPU_BASED_RDPMC_EXITING.

My patch is suppose to hide CPU_BASED_RDPMC_EXITING from L1 only in case L1
vCPU is not exposed with PMU.

Can you provide more details on the vCPU your setup expose to L1?
Have you explicitly disabled PMU from L1 vCPU?
Can you run “cpuid -r” on shell and post here it’s output?

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