Re: [PATCH 0/6] KVM: x86: Unhost the *_CMD MSR mess

Sean Christopherson
2023-03-23T22:46:59Z

On Tue, 21 Mar 2023 18:14:34 -0700, Sean Christopherson wrote:
> Revert the FLUSH_L1D enabling, which has multiple fatal bugs, clean up
> the existing PRED_CMD handling, and reintroduce FLUSH_L1D virtualization
> without inheriting the mistakes made by PRED_CMD.
>
> The last patch hardens SVM against one of the bugs introduced in the
> FLUSH_L1D enabling.
>
> [...]

Applied to a one-off branch, kvm-x86 cmd_msrs, so that I can get this into
kvm-x86 next and onto linux-next asap. I'll drop the branch if Paolo wants
to do something else, or if there are issues with the series.

[1/6] KVM: x86: Revert MSR_IA32_FLUSH_CMD.FLUSH_L1D enabling
https://github.com/kvm-x86/linux/commit/e9c126917c09
[2/6] KVM: VMX: Passthrough MSR_IA32_PRED_CMD based purely on host+guest CPUID
https://github.com/kvm-x86/linux/commit/4f9babd37df0
[3/6] KVM: SVM: Passthrough MSR_IA32_PRED_CMD based purely on host+guest CPUID
https://github.com/kvm-x86/linux/commit/5ac641dff621
[4/6] KVM: x86: Move MSR_IA32_PRED_CMD WRMSR emulation to common code
https://github.com/kvm-x86/linux/commit/584aeda90bd9
[5/6] KVM: x86: Virtualize FLUSH_L1D and passthrough MSR_IA32_FLUSH_CMD
https://github.com/kvm-x86/linux/commit/5bdebd246db5
[6/6] KVM: SVM: Return the local "r" variable from svm_set_msr()
https://github.com/kvm-x86/linux/commit/8a16ed8c673c

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