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Re: [Qemu-devel] [PATCH qemu v2 0/4] spapr_pci, vfio: NVIDIA V100 + POWE

From: Alex Williamson
Subject: Re: [Qemu-devel] [PATCH qemu v2 0/4] spapr_pci, vfio: NVIDIA V100 + POWER9 passthrough
Date: Thu, 14 Feb 2019 16:37:43 -0700

On Thu, 14 Feb 2019 16:21:40 +1100
Alexey Kardashevskiy <address@hidden> wrote:

> This is for passing through NVIDIA V100 GPUs on POWER9 systems.
> This implements a subdriver for NVIDIA V100 GPU with coherent memory and
> NPU/ATS support available in the POWER9 CPU.
> 1/4 is a preparation for bigger DMA windows.
> 2/4 is a small cleanup.
> Here is the kernel driver:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/vfio/pci?h=v5.0-rc6&id=7f92891778dff62303c070ac81de7b7d80de331a
> SLOF changes already went in.
> This depends on "pci: Move NVIDIA vendor id to the rest of ids" (posted 
> separately).

TBH, I'm not sure it was the best idea to let it live or die on it's
own when it now creates a build dependency for this series.

> This is based on sha1
> 1ea6057 Mark Cave-Ayland "mac_newworld: change default NIC to sungem for 
> mac99 machine".

Perhaps this is why it doesn't apply cleanly against qemu.git.  Are
there dependencies we need to wait for in the ppc tree as well?

> Please comment. Thanks.

Besides the build dependency on PCI_VENDOR_ID_NVIDIA, I also get this:

.../qemu.git/hw/vfio/spapr.c: In function ‘vfio_spapr_create_window’:
.../qemu.git/hw/vfio/spapr.c:212:9: error: ‘ret’ may be used uninitialized in 
this function [-Werror=maybe-uninitialized]
         error_report("Failed to create a window, ret = %d (%m)", ret);
cc1: all warnings being treated as errors

Is this series expected to go in through the ppc branch given the bulk
of the changes are there?  Thanks,


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