| Date | Sun, 13 Aug 2023 12:36:57 +0200 | From | Borislav Petkov <> | Subject | Re: [RFC][PATCH 07/17] x86/cpu/kvm: Provide UNTRAIN_RET_VM |
| |
On Wed, Aug 09, 2023 at 09:12:25AM +0200, Peter Zijlstra wrote: > With the difference being that UNTRAIN_RET_VM uses > X86_FEATURE_IBPB_ON_VMEXIT instead of X86_FEATURE_ENTRY_IBPB. > > This cures VMEXIT doing potentially unret+IBPB or double IBPB.
Can't - I have a separate flag for that and I set it only when !IBPB:
case SRSO_CMD_IBPB_ON_VMEXIT: if (IS_ENABLED(CONFIG_CPU_SRSO)) { if (!boot_cpu_has(X86_FEATURE_ENTRY_IBPB) && has_microcode) { setup_force_cpu_cap(X86_FEATURE_IBPB_ON_VMEXIT);
But I like the separate macro.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
|