linux-kernel - Re: [PATCH] xen: Allow platform PCI interrupt to be shared

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Message-ID: <bfe244a08572b1d57dcb5c538bcb70e9f45761f6.camel@infradead.org>
Date:   Wed, 18 Jan 2023 14:43:13 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Durrant <paul@....org>
Subject: Re: [PATCH] xen: Allow platform PCI interrupt to be shared

On Wed, 2023-01-18 at 14:39 +0000, Andrew Cooper wrote:
> On 18/01/2023 2:26 pm, David Woodhouse wrote:?
> > > There is no actual thing called PVHVM.  That diagram has caused far more
> > > damage than good...
> > >
> > > There's HVM (and by this, I mean the hypervisor's interpretation meaning
> > > VT-x or SVM), and a spectrum of things the guest kernel can do if it
> > > desires.
> > > 
> > > I'm pretty sure Linux knows all of them.
> >
> > But don't we want to refrain from providing the legacy PC platform devices?
> 
> That also exists and works fine (and is one slice on the spectrum).  KVM
> even borrowed our PVH boot API because we'd already done the hard work
> in Linux.

Ah, but it doesn't exist in qemu (on KVM) yet ;)

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