linux-kernel - Re: [PATCH 5/5] x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST

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Message-ID: <1abc2a34c894c32eb474a868671577f6991579df.camel@infradead.org>
Date:   Mon, 12 Oct 2020 21:20:43 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        Marc Zyngier <maz@...nel.org>
Cc:     kvm <kvm@...r.kernel.org>, Paolo Bonzini <pbonzini@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST_ID

On Mon, 2020-10-12 at 20:38 +0200, Thomas Gleixner wrote:
> On Mon, Oct 12 2020 at 17:06, David Woodhouse wrote:
> > On Mon, 2020-10-12 at 11:33 +0200, Thomas Gleixner wrote:
> > > You might want to look into using irq_find_matching_fwspec()
> > > instead for
> > > both HPET and IOAPIC. That needs a select() callback implemented
> > > in the
> > > remapping domains.
> > 
> > That works.
> 
> :)
> 
> Nasty, but way better than what we have now. 

Want me to send that out in email or is the git tree enough for now?

I've cleaned it up a little and fixed a bug in the I/OAPIC error path.

Still not entirely convinced about the apic->apic_id_valid(32768) thing
but it should work well enough, and doesn't require exporting any extra
state from apic.c that way.


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