linux-kernel - Re: [RESEND PATCH 5/6] KVM: x86/VMX: add kvm_vmx_reinject_nmi

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Date:   Wed, 23 Nov 2022 10:16:24 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     "Li, Xin3" <xin3.li@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "Tian, Kevin" <kevin.tian@...el.com>
Subject: Re: [RESEND PATCH 5/6] KVM: x86/VMX: add kvm_vmx_reinject_nmi_irq()
 for NMI/IRQ reinjection

On Tue, Nov 22, 2022 at 08:52:35PM +0000, Sean Christopherson wrote:

> Another wart that needs to be addressed is trace_kvm_exit().  IIRC, tracepoints
> must be outside of noinstr, though maybe I'm misremembering that.

You are not, that is correct. Another point to be careful with is usage
of jump_label and static_call, both can be used in noinstr *provided*
they don't actually ever change -- so boot time setup only.

If either of them were to change, text_poke_bp() has a clue in the name.