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[Qemu-devel] Re: [PATCH] pci: disable migration of p2p bridge
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH] pci: disable migration of p2p bridge |
Date: |
Wed, 22 Dec 2010 08:27:17 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Dec 22, 2010 at 12:13:43PM +0900, Isaku Yamahata wrote:
> Right now pcibus_get_dev_path() isn't migration save because
> bus number/secondary bus number are set by guest OS.
> So it can't be used reliably for qemu internal id.
>
> For 0.14 release, disable p2p bridge migration at the moment.
> Once pcibus_get_dev_path() is fixed, this patch should be reverted.
> It will be addressed for 0.15 release.
>
> Cc: "Michael S. Tsirkin" <address@hidden>
> Cc: Alex Williamson <address@hidden>
> Cc: Blue Swirl <address@hidden>
> Signed-off-by: Isaku Yamahata <address@hidden>
Hmm, haven't looked into this deeply - can we do this in one place
when the bridge is created?
> ---
> hw/apb_pci.c | 9 +++++++++
> hw/dec_pci.c | 6 ++++++
> hw/ioh3420.c | 4 ++++
> hw/xio3130_downstream.c | 4 ++++
> hw/xio3130_upstream.c | 4 ++++
> 5 files changed, 27 insertions(+), 0 deletions(-)
>
> diff --git a/hw/apb_pci.c b/hw/apb_pci.c
> index 84e9af7..c456d8d 100644
> --- a/hw/apb_pci.c
> +++ b/hw/apb_pci.c
> @@ -368,6 +368,11 @@ PCIBus *pci_apb_init(target_phys_addr_t special_base,
> qdev_init_nofail(&pci_dev->qdev);
> *bus2 = pci_bridge_get_sec_bus(br);
>
> + /* TODO: p2p bridge migration. pcibus_get_dev_path() isn't
> migration-safe.
> + remove this once p2p bridge migration is supported */
> + register_device_unmigratable(&pci_dev->qdev, "pbm-bridge",
> &pci_dev->qdev);
> +
> +
> pci_dev = pci_create_multifunction(d->bus, PCI_DEVFN(1, 1), true,
> "pbm-bridge");
> br = DO_UPCAST(PCIBridge, dev, pci_dev);
> @@ -376,6 +381,10 @@ PCIBus *pci_apb_init(target_phys_addr_t special_base,
> qdev_init_nofail(&pci_dev->qdev);
> *bus3 = pci_bridge_get_sec_bus(br);
>
> + /* TODO: p2p bridge migration. pcibus_get_dev_path() isn't
> migration-safe.
> + remove this once p2p bridge migration is supported */
> + register_device_unmigratable(&pci_dev->qdev, "pbm-bridge",
> &pci_dev->qdev);
> +
> return d->bus;
> }
>
> diff --git a/hw/dec_pci.c b/hw/dec_pci.c
> index bf88f2a..3710984 100644
> --- a/hw/dec_pci.c
> +++ b/hw/dec_pci.c
> @@ -86,6 +86,12 @@ PCIBus *pci_dec_21154_init(PCIBus *parent_bus, int devfn)
> br = DO_UPCAST(PCIBridge, dev, dev);
> pci_bridge_map_irq(br, "DEC 21154 PCI-PCI bridge", dec_map_irq);
> qdev_init_nofail(&dev->qdev);
> +
> + /* TODO: p2p bridge migration. pcibus_get_dev_path() isn't
> migration-safe.
> + remove this once p2p bridge migration is supported */
> + register_device_unmigratable(&dev->qdev, "dec-21154-p2p-bridge",
> + &dev->qdev);
> +
> return pci_bridge_get_sec_bus(br);
> }
>
> diff --git a/hw/ioh3420.c b/hw/ioh3420.c
> index 95adf09..b1a5c96 100644
> --- a/hw/ioh3420.c
> +++ b/hw/ioh3420.c
> @@ -188,6 +188,10 @@ PCIESlot *ioh3420_init(PCIBus *bus, int devfn, bool
> multifunction,
> qdev_prop_set_uint16(qdev, "slot", slot);
> qdev_init_nofail(qdev);
>
> + /* TODO: p2p bridge migration. pcibus_get_dev_path() isn't
> migration-safe.
> + remove this once p2p bridge migration is supported */
> + register_device_unmigratable(qdev, "ioh3420", qdev);
> +
> return DO_UPCAST(PCIESlot, port, DO_UPCAST(PCIEPort, br, br));
> }
>
> diff --git a/hw/xio3130_downstream.c b/hw/xio3130_downstream.c
> index 1a2d258..83394ab 100644
> --- a/hw/xio3130_downstream.c
> +++ b/hw/xio3130_downstream.c
> @@ -153,6 +153,10 @@ PCIESlot *xio3130_downstream_init(PCIBus *bus, int
> devfn, bool multifunction,
> qdev_prop_set_uint16(qdev, "slot", slot);
> qdev_init_nofail(qdev);
>
> + /* TODO: p2p bridge migration. pcibus_get_dev_path() isn't
> migration-safe.
> + remove this once p2p bridge migration is supported */
> + register_device_unmigratable(qdev, "x3130-downstream", qdev);
> +
> return DO_UPCAST(PCIESlot, port, DO_UPCAST(PCIEPort, br, br));
> }
>
> diff --git a/hw/xio3130_upstream.c b/hw/xio3130_upstream.c
> index 387bf6c..cbd126a 100644
> --- a/hw/xio3130_upstream.c
> +++ b/hw/xio3130_upstream.c
> @@ -134,6 +134,10 @@ PCIEPort *xio3130_upstream_init(PCIBus *bus, int devfn,
> bool multifunction,
> qdev_prop_set_uint8(qdev, "port", port);
> qdev_init_nofail(qdev);
>
> + /* TODO: p2p bridge migration. pcibus_get_dev_path() isn't
> migration-safe.
> + remove this once p2p bridge migration is supported */
> + register_device_unmigratable(qdev, "x3130-upstream", qdev);
> +
> return DO_UPCAST(PCIEPort, br, br);
> }
>
> --
> 1.7.1.1