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Date: Wed, 4 Mar 2020 07:37:27 -0800
From: Ram Pai <linuxram@us.ibm.com>
To: Greg Kurz <groug@kaod.org>
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Subject: RE: [RFC PATCH v1] powerpc/prom_init: disable XIVE in Secure VM.
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Reply-To: Ram Pai <linuxram@us.ibm.com>
Cc: aik@ozlabs.ru, andmike@linux.ibm.com, kvm-ppc@vger.kernel.org,
 =?iso-8859-1?Q?C=E9dric?= Le Goater <clg@fr.ibm.com>,
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On Wed, Mar 04, 2020 at 11:59:48AM +0100, Greg Kurz wrote:
> On Tue, 3 Mar 2020 10:56:45 -0800
> Ram Pai <linuxram@us.ibm.com> wrote:
> 
> > On Tue, Mar 03, 2020 at 06:45:20PM +0100, Greg Kurz wrote:
....snip.
> > > 
> > > This patch would allow at least to answer Cedric's question about
> > > kernel_irqchip=off, since this looks like the only thing needed
> > > to make it work.
> > 
> > hmm.. I am not sure. Are you saying
> > (a) patch the guest kernel to share the event queue page
> > (b) run the qemu with "kernel_irqchip=off"
> > (c) and the guest kernel with "svm=on"
> > 
> > and it should all work?
> > 
> 
> Yes.

Ok. 

(1) applied the patch which shares the EQ-page with the hypervisor.
(2) set "kernel_irqchip=off"
(3) set "ic-mode=xive"
(4) set "svm=on" on the kernel command line.
(5) no changes to the hypervisor and ultravisor.

And Boom it works!.   So you were right.


I am sending out the patch for (1) above ASAP.

Thanks,
RP


From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ram Pai <linuxram@us.ibm.com>
Date: Wed, 04 Mar 2020 15:37:27 +0000
Subject: RE: [RFC PATCH v1] powerpc/prom_init: disable XIVE in Secure VM.
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To: Greg Kurz <groug@kaod.org>
Cc: aik@ozlabs.ru, andmike@linux.ibm.com, kvm-ppc@vger.kernel.org, =?iso-8859-1?Q?C=E9dric?= Le Goater <clg@fr.ibm.com>, sukadev@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, bauerman@linux.ibm.com, David Gibson <david@gibson.dropbear.id.au>

On Wed, Mar 04, 2020 at 11:59:48AM +0100, Greg Kurz wrote:
> On Tue, 3 Mar 2020 10:56:45 -0800
> Ram Pai <linuxram@us.ibm.com> wrote:
> 
> > On Tue, Mar 03, 2020 at 06:45:20PM +0100, Greg Kurz wrote:
....snip.
> > > 
> > > This patch would allow at least to answer Cedric's question about
> > > kernel_irqchip=off, since this looks like the only thing needed
> > > to make it work.
> > 
> > hmm.. I am not sure. Are you saying
> > (a) patch the guest kernel to share the event queue page
> > (b) run the qemu with "kernel_irqchip=off"
> > (c) and the guest kernel with "svm=on"
> > 
> > and it should all work?
> > 
> 
> Yes.

Ok. 

(1) applied the patch which shares the EQ-page with the hypervisor.
(2) set "kernel_irqchip=off"
(3) set "ic-mode=xive"
(4) set "svm=on" on the kernel command line.
(5) no changes to the hypervisor and ultravisor.

And Boom it works!.   So you were right.


I am sending out the patch for (1) above ASAP.

Thanks,
RP