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Date: Tue, 2 Feb 2021 18:15:23 +0000
From: Michael Kelley <mikelley@...rosoft.com>
To: Wei Liu <wei.liu@...nel.org>
CC: Linux on Hyper-V List <linux-hyperv@...r.kernel.org>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
Linux Kernel List <linux-kernel@...r.kernel.org>,
Vineeth Pillai <viremana@...ux.microsoft.com>,
Sunil Muthuswamy <sunilmut@...rosoft.com>,
Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
"pasha.tatashin@...een.com" <pasha.tatashin@...een.com>,
KY Srinivasan <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Stephen Hemminger <sthemmin@...rosoft.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>
Subject: RE: [PATCH v5 15/16] x86/hyperv: implement an MSI domain for root
partition
From: Wei Liu <wei.liu@...nel.org> Sent: Tuesday, February 2, 2021 9:32 AM
>
> On Wed, Jan 27, 2021 at 05:47:04AM +0000, Michael Kelley wrote:
> > From: Wei Liu <wei.liu@...nel.org> Sent: Wednesday, January 20, 2021 4:01 AM
> > >
> > > When Linux runs as the root partition on Microsoft Hypervisor, its
> > > interrupts are remapped. Linux will need to explicitly map and unmap
> > > interrupts for hardware.
> > >
> > > Implement an MSI domain to issue the correct hypercalls. And initialize
> > > this irqdomain as the default MSI irq domain.
> > >
> > > Signed-off-by: Sunil Muthuswamy <sunilmut@...rosoft.com>
> > > Co-Developed-by: Sunil Muthuswamy <sunilmut@...rosoft.com>
> > > Signed-off-by: Wei Liu <wei.liu@...nel.org>
> > > ---
> > > v4: Fix compilation issue when CONFIG_PCI_MSI is not set.
> > > v3: build irqdomain.o for 32bit as well.
> >
> > I'm not clear on the intent for 32-bit builds. Given that hv_proc.c is built
> > only for 64-bit, I'm assuming running Linux in the root partition
> > is only functional for 64-bit builds. So is the goal simply that 32-bit
> > builds will compile correctly? Seems like maybe there should be
> > a CONFIG option for running Linux in the root partition, and that
> > option would force 64-bit.
>
> To ensure 32 bit kernel builds and 32 bit guests still work.
>
> The config option ROOT_API is to be introduced by Nuno's /dev/mshv
> series. We can use that option to gate some objects when that's
> available.
>
But just so I'm 100% clear, is there intent to run 32-bit Linux in the root
partition? I'm assuming not.
Michael
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