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To: Alexey Kardashevskiy <aik@ozlabs.ru>, linuxppc-dev@lists.ozlabs.org
From: Michael Ellerman <patch-notifications@ellerman.id.au>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>, linux-pci@vger.kernel.org,
 Gavin Shan <gwshan@linux.vnet.ibm.com>, kvm-ppc@vger.kernel.org,
 Yongji Xie <elohimes@gmail.com>, Paul Mackerras <paulus@samba.org>,
 Bjorn Helgaas <bhelgaas@google.com>,
 David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [kernel,
 v2] powerpc/powernv: Reserve a hole which appears after enabling IOV
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Date: Wed,  8 Nov 2017 10:30:13 +1100 (AEDT)
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On Wed, 2017-09-27 at 06:52:31 UTC, Alexey Kardashevskiy wrote:
> In order to make generic IOV code work, the physical function IOV BAR
> should start from offset of the first VF. Since M64 segments share
> PE number space across PHB, and some PEs may be in use at the time
> when IOV is enabled, the existing code shifts the IOV BAR to the index
> of the first PE/VF. This creates a hole in IOMEM space which can be
> potentially taken by some other device.
> 
> This reserves a temporary hole on a parent and releases it when IOV is
> disabled; the temporary resources are stored in pci_dn to avoid
> kmalloc/free.
> 
> Cc: linux-pci@vger.kernel.org
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/d6f934fd48803d9e58040e2cbab2fe

cheers