linux-kernel - Re: [patch V3 16/22] genirq/msi: Provide new domain id based interfaces for freeing interrupts

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Message-ID: <57f3f757aaceccf866172faaf48ab62916f24d8b.camel@infradead.org>
Date:   Mon, 16 Jan 2023 19:28:19 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Juergen Gross <jgross@...e.com>,
        xen-devel <xen-devel@...ts.xen.org>
Cc:     x86@...nel.org, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>
Subject: Re: [patch V3 16/22] genirq/msi: Provide new domain id based
 interfaces for freeing interrupts

On Mon, 2023-01-16 at 20:22 +0100, Thomas Gleixner wrote:
> > Tested-by: David Woodhouse <dwmw@...zon.co.uk>
> > 
> > Albeit only under qemu with
> > https://git.infradead.org/users/dwmw2/qemu.git/shortlog/refs/heads/xenfv
> > and not under real Xen.
> 
> Five levels of emulation. What could possibly go wrong?

It's the opposite — this is what happened when I threw my toys out of
the pram and said, "You're NOT doing that with nested virtualization!".

One level of emulation. We host guests that think they're running on
Xen, directly in QEMU/KVM by handling the hypercalls and event
channels, grant tables, etc.

We virtualised Xen itself :)

Now you have no more excuses for breaking Xen guest mode!

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