Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [RESEND][patch V3 19/23] x86/kvm/vmx: Add hardirq tracing to guest enter/exit | Date | Wed, 25 Mar 2020 00:21:38 +0100 |
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Peter Zijlstra <peterz@infradead.org> writes:
> On Fri, Mar 20, 2020 at 07:00:15PM +0100, Thomas Gleixner wrote: >> The VMX code does not track hard interrupt state correctly. The state in >> tracing and lockdep is 'OFF' all the way during guest mode. From the host >> point of view this is wrong because the VMENTER reenables interrupts like a >> return to user space and VMENTER disables them again like an entry from >> user space. >> >> Make it do exactly the same thing as enter/exit user mode does. >> >> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > > This patch (and the SVM counterpart) result in: > > ERROR: "lockdep_hardirqs_on" [arch/x86/kvm/kvm-amd.ko] undefined! > ERROR: "lockdep_hardirqs_off" [arch/x86/kvm/kvm-amd.ko] undefined! > ERROR: "__trace_hardirqs_off" [arch/x86/kvm/kvm-amd.ko] undefined! > ERROR: "lockdep_hardirqs_on_prepare" [arch/x86/kvm/kvm-amd.ko] undefined! > ERROR: "__trace_hardirqs_on" [arch/x86/kvm/kvm-amd.ko] undefined! > ERROR: "lockdep_hardirqs_on" [arch/x86/kvm/kvm-intel.ko] undefined! > ERROR: "lockdep_hardirqs_off" [arch/x86/kvm/kvm-intel.ko] undefined! > ERROR: "__trace_hardirqs_off" [arch/x86/kvm/kvm-intel.ko] undefined! > ERROR: "lockdep_hardirqs_on_prepare" [arch/x86/kvm/kvm-intel.ko] undefined! > ERROR: "__trace_hardirqs_on" [arch/x86/kvm/kvm-intel.ko] undefined! > > on allmodconfig. > > I suppose them things need an EXPORT_SYMBOL_GPL() on them.
Indeed.
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