linux-kernel - Re: [PATCH] PCI: Introduce two new MSI infrastructure calls for masking/unmasking.

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Message-ID: <20131108153507.GA24755@phenom.dumpdata.com>
Date:	Fri, 8 Nov 2013 10:35:07 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Zhenzhong Duan <zhenzhong.duan@...cle.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	xen-devel@...ts.xenproject.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Sucheta Chakraborty <sucheta.chakraborty@...gic.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH] PCI: Introduce two new MSI infrastructure calls for
 masking/unmasking.

On Fri, Nov 08, 2013 at 09:44:09AM +0800, Zhenzhong Duan wrote:
> 
> On 2013-11-07 07:51, Bjorn Helgaas wrote:
> >[+cc Thomas, Ingo, Peter, x86 list]
> >
> >On Wed, Nov 6, 2013 at 2:16 PM, Konrad Rzeszutek Wilk
> ><konrad.wilk@...cle.com> wrote:
> >>Certain platforms do not allow writes in the MSI-X bars
> >>to setup or tear down vector values. To combat against
> >>the generic code trying to write to that and either silently
> >>being ignored or crashing due to the pagetables being marked r/o
> >>this patch introduces a platform over-write.
> >>
> >>Note that we keep two separate, non-weak, functions
> >>default_mask_msi_irqs() and default_mask_msix_irqs() for the
> >>behavior of the arch_mask_msi_irqs() and arch_mask_msix_irqs(),
> >>as the default behavior is needed by x86 PCI code.
> >>
> >>For Xen, which does not allow the guest to write to MSI-X
> >>tables - as the hypervisor is solely responsible for setting
> >>the vector values - we implement two nops.
> >>
> >>CC: Bjorn Helgaas <bhelgaas@...gle.com>
> >>CC: Sucheta Chakraborty <sucheta.chakraborty@...gic.com>
> >>CC: Zhenzhong Duan <zhenzhong.duan@...cle.com>
> >>Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> >I think this is safe, and I'd like to squeeze it into the v3.13 merge
> >window next week, since it supersedes three patches Zhenzhong has been
> >trying to get in since July [1], and this patch is much simpler to
> >understand.
> This patch could replace the first two.
> I think the third patch of mine is still needed as it does a
> different thing.
> It optimizes restore path in dom0.

I tried to rebase it on top of this patch but it ended up that
you still need the two arguments (for restore_... operation). 

But perhaps there is a better way. If you can rebase on top
of this patch - and send it out - that would be great!
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