linux-kernel - Re: [PATCH v2 04/17] iommu/hyperv: don't setup IRQ remapping when running as root

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Date:   Fri, 13 Nov 2020 14:53:04 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Wei Liu <wei.liu@...nel.org>,
        Linux on Hyper-V List <linux-hyperv@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        Joerg Roedel <jroedel@...e.de>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Joerg Roedel <joro@...tes.org>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH v2 04/17] iommu/hyperv: don't setup IRQ remapping when
 running as root

On Thu, Nov 12, 2020 at 04:27:14PM +0100, Vitaly Kuznetsov wrote:
> Wei Liu <wei.liu@...nel.org> writes:
> 
> > The IOMMU code needs more work. We're sure for now the IRQ remapping
> > hooks are not applicable when Linux is the root.
> 
> Super-nitpick: I would suggest we always say 'root partition' as 'root'
> has a 'slightly different' meaning in Linux and this commit message may
> sound confusing to an unprepared reader.

Fixed.

> 
> >
> > Signed-off-by: Wei Liu <wei.liu@...nel.org>
> > Acked-by: Joerg Roedel <jroedel@...e.de>
> > ---
> >  drivers/iommu/hyperv-iommu.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c
> > index e09e2d734c57..8d3ce3add57d 100644
> > --- a/drivers/iommu/hyperv-iommu.c
> > +++ b/drivers/iommu/hyperv-iommu.c
> > @@ -20,6 +20,7 @@
> >  #include <asm/io_apic.h>
> >  #include <asm/irq_remapping.h>
> >  #include <asm/hypervisor.h>
> > +#include <asm/mshyperv.h>
> >  
> >  #include "irq_remapping.h"
> >  
> > @@ -143,7 +144,7 @@ static int __init hyperv_prepare_irq_remapping(void)
> >  	int i;
> >  
> >  	if (!hypervisor_is_type(X86_HYPER_MS_HYPERV) ||
> > -	    !x2apic_supported())
> > +	    !x2apic_supported() || hv_root_partition)
> >  		return -ENODEV;
> >  
> >  	fn = irq_domain_alloc_named_id_fwnode("HYPERV-IR", 0);
> 
> Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

Thanks.

Wei.

> 
> -- 
> Vitaly
>