linux-kernel - RE: [RESEND PATCH 2/6] x86/traps: add a system interrupt table for system interrupt dispatch

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Date:   Thu, 10 Nov 2022 19:55:22 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     "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>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>
Subject: RE: [RESEND PATCH 2/6] x86/traps: add a system interrupt table for
 system interrupt dispatch

> > Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
> > Signed-off-by: Xin Li <xin3.li@...el.com>
> 
> This is not a valid SOB, it would suggest hpa is the author, but he's not in in
> From.

HPA wrote the initial dispatch code for FRED, and I worked with him to
refactor it for KVM/VMX NMI/IRQ dispatch.  So use SOB from both.  No?

> > diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index
> > 178015a820f0..95dd917ef9ad 100644
> > --- a/arch/x86/kernel/traps.c
> > +++ b/arch/x86/kernel/traps.c
> > @@ -1444,6 +1444,61 @@ DEFINE_IDTENTRY_SW(iret_error)  }  #endif
> >
> > +#define SYSV(x,y) [(x) - FIRST_SYSTEM_VECTOR] =
> > +(system_interrupt_handler)y
> > +
> > +#pragma GCC diagnostic push
> > +#pragma GCC diagnostic ignored "-Wcast-function-type"
> 
> How does this not break CFI ?

I wasn't aware of it, will check.