linux-kernel - RE: [RESEND PATCH 4/6] x86/traps: add external_interrupt() to dispatch external interrupts

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Date:   Thu, 10 Nov 2022 18:02:23 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
To:     "Christopherson,, Sean" <seanjc@...gle.com>
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>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>
Subject: RE: [RESEND PATCH 4/6] x86/traps: add external_interrupt() to
 dispatch external interrupts

> > +__visible noinstr void external_interrupt(struct pt_regs *regs,
> > +					  unsigned int vector)
> > +{
> > +	unsigned int sysvec = vector - FIRST_SYSTEM_VECTOR;
> > +
> > +	BUG_ON(vector < FIRST_EXTERNAL_VECTOR);
> 
> Why not return an error up the stack?  KVM and/or CPU bugs aren't unheard
> of.
> Dropping an IRQ obviously isn't ideal, but there's a non-zero chance that letting
> KVM WARN and kill the VM will keep the host alive and thus other VMs
> running.  A somewhat sophisticated setup might even react to the VM being
> killed by migrating other VMs off the system and initiating host maintenance.

Make sense.

What about having it return a signed integer?