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Re: [Qemu-devel] [PATCH] pci: fix requester id to be the one on root bus

From: Peter Xu
Subject: Re: [Qemu-devel] [PATCH] pci: fix requester id to be the one on root bus
Date: Thu, 12 May 2016 10:40:57 +0800
User-agent: Mutt/1.5.24 (2015-08-30)

On Wed, May 11, 2016 at 04:53:54PM +0300, Michael S. Tsirkin wrote:
> On Wed, May 11, 2016 at 02:40:31PM +0800, Peter Xu wrote:
> > When there are devices under PCI bridge (or bridges), PCI requester ID
> > should be the one that hooked on the root PCI bus, not the PCI device
> > itself.
> > 
> > Signed-off-by: Peter Xu <address@hidden>
> I think this is only correct for pci bridges, and wrong for pci express 
> bridges.
> How exactly do you test this?

I was using Radim's test case:

$bin -machine q35,iommu=on,intremap=on,kernel-irqchip=split \
     -smp cpus=2 -m 1024 -enable-kvm \
     -device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e \
     -device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x0 \
     -netdev user,id=user.0,hostfwd=tcp::5555-:22 \
     -device e1000,netdev=user.0,bus=pci.2,addr=0x1 \

This does not boot on v6 series, but can boot with the patch

Do you know where I can find any document on related topics?

Thanks in advance.

-- peterx

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