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Date: Tue, 12 Mar 2013 16:59:18 +0000
From: "Jan Beulich" <JBeulich@...e.com>
To: "Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc: "xen-devel" <xen-devel@...ts.xen.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] xen-pciback: notify hypervisor about
devices intended to be assigned to guests
>>> On 12.03.13 at 16:06, "Jan Beulich" <JBeulich@...e.com> wrote:
> For MSI-X capable devices the hypervisor wants to write protect the
> MSI-X table and PBA, yet it can't assume that resources have been
> assigned to their final values at device enumeration time. Thus have
> pciback do that notification, as having the device controlled by it is
> a prerequisite to assigning the device to guests anyway.
>
> This is the kernel part of hypervisor side commit 4245d33 ("x86/MSI:
> add mechanism to fully protect MSI-X table from PV guest accesses") on
> the master branch of git://xenbits.xen.org/xen.git.
>
> Signed-off-by: Jan Beulich <jbeulich@...e.com>
Just noticed that once again I forgot to Cc stable@ - could you
please add this as you commit it to your tree?
I'm sorry about this, Jan
> ---
> arch/x86/include/asm/xen/hypercall.h | 4 +-
> drivers/xen/fallback.c | 3 +
> drivers/xen/xen-pciback/pci_stub.c | 59 ++++++++++++++++++++++++++---------
> include/xen/interface/physdev.h | 6 +++
> 4 files changed, 54 insertions(+), 18 deletions(-)
>
> --- 3.9-rc2/arch/x86/include/asm/xen/hypercall.h
> +++ 3.9-rc2-xen-pciback-MSI-X-prepare/arch/x86/include/asm/xen/hypercall.h
> @@ -382,14 +382,14 @@ HYPERVISOR_console_io(int cmd, int count
> return _hypercall3(int, console_io, cmd, count, str);
> }
>
> -extern int __must_check HYPERVISOR_physdev_op_compat(int, void *);
> +extern int __must_check xen_physdev_op_compat(int, void *);
>
> static inline int
> HYPERVISOR_physdev_op(int cmd, void *arg)
> {
> int rc = _hypercall2(int, physdev_op, cmd, arg);
> if (unlikely(rc == -ENOSYS))
> - rc = HYPERVISOR_physdev_op_compat(cmd, arg);
> + rc = xen_physdev_op_compat(cmd, arg);
> return rc;
> }
>
> --- 3.9-rc2/drivers/xen/fallback.c
> +++ 3.9-rc2-xen-pciback-MSI-X-prepare/drivers/xen/fallback.c
> @@ -44,7 +44,7 @@ int xen_event_channel_op_compat(int cmd,
> }
> EXPORT_SYMBOL_GPL(xen_event_channel_op_compat);
>
> -int HYPERVISOR_physdev_op_compat(int cmd, void *arg)
> +int xen_physdev_op_compat(int cmd, void *arg)
> {
> struct physdev_op op;
> int rc;
> @@ -78,3 +78,4 @@ int HYPERVISOR_physdev_op_compat(int cmd
>
> return rc;
> }
> +EXPORT_SYMBOL_GPL(xen_physdev_op_compat);
> --- 3.9-rc2/drivers/xen/xen-pciback/pci_stub.c
> +++ 3.9-rc2-xen-pciback-MSI-X-prepare/drivers/xen/xen-pciback/pci_stub.c
> @@ -17,6 +17,7 @@
> #include <xen/events.h>
> #include <asm/xen/pci.h>
> #include <asm/xen/hypervisor.h>
> +#include <xen/interface/physdev.h>
> #include "pciback.h"
> #include "conf_space.h"
> #include "conf_space_quirks.h"
> @@ -85,37 +86,52 @@ static struct pcistub_device *pcistub_de
> static void pcistub_device_release(struct kref *kref)
> {
> struct pcistub_device *psdev;
> + struct pci_dev *dev;
> struct xen_pcibk_dev_data *dev_data;
>
> psdev = container_of(kref, struct pcistub_device, kref);
> - dev_data = pci_get_drvdata(psdev->dev);
> + dev = psdev->dev;
> + dev_data = pci_get_drvdata(dev);
>
> - dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
> + dev_dbg(&dev->dev, "pcistub_device_release\n");
>
> - xen_unregister_device_domain_owner(psdev->dev);
> + xen_unregister_device_domain_owner(dev);
>
> /* Call the reset function which does not take lock as this
> * is called from "unbind" which takes a device_lock mutex.
> */
> - __pci_reset_function_locked(psdev->dev);
> - if (pci_load_and_free_saved_state(psdev->dev,
> - &dev_data->pci_saved_state)) {
> - dev_dbg(&psdev->dev->dev, "Could not reload PCI state\n");
> - } else
> - pci_restore_state(psdev->dev);
> + __pci_reset_function_locked(dev);
> + if (pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state))
> + dev_dbg(&dev->dev, "Could not reload PCI state\n");
> + else
> + pci_restore_state(dev);
> +
> + if (pci_find_capability(dev, PCI_CAP_ID_MSIX)) {
> + struct physdev_pci_device ppdev = {
> + .seg = pci_domain_nr(dev->bus),
> + .bus = dev->bus->number,
> + .devfn = dev->devfn
> + };
> + int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix,
> + &ppdev);
> +
> + if (err)
> + dev_warn(&dev->dev, "MSI-X release failed (%d)\n",
> + err);
> + }
>
> /* Disable the device */
> - xen_pcibk_reset_device(psdev->dev);
> + xen_pcibk_reset_device(dev);
>
> kfree(dev_data);
> - pci_set_drvdata(psdev->dev, NULL);
> + pci_set_drvdata(dev, NULL);
>
> /* Clean-up the device */
> - xen_pcibk_config_free_dyn_fields(psdev->dev);
> - xen_pcibk_config_free_dev(psdev->dev);
> + xen_pcibk_config_free_dyn_fields(dev);
> + xen_pcibk_config_free_dev(dev);
>
> - psdev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
> - pci_dev_put(psdev->dev);
> + dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
> + pci_dev_put(dev);
>
> kfree(psdev);
> }
> @@ -355,6 +371,19 @@ static int pcistub_init_device(struct pc
> if (err)
> goto config_release;
>
> + if (pci_find_capability(dev, PCI_CAP_ID_MSIX)) {
> + struct physdev_pci_device ppdev = {
> + .seg = pci_domain_nr(dev->bus),
> + .bus = dev->bus->number,
> + .devfn = dev->devfn
> + };
> +
> + err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev);
> + if (err)
> + dev_err(&dev->dev, "MSI-X preparation failed (%d)\n",
> + err);
> + }
> +
> /* We need the device active to save the state. */
> dev_dbg(&dev->dev, "save state of device\n");
> pci_save_state(dev);
> --- 3.9-rc2/include/xen/interface/physdev.h
> +++ 3.9-rc2-xen-pciback-MSI-X-prepare/include/xen/interface/physdev.h
> @@ -251,6 +251,12 @@ struct physdev_pci_device_add {
>
> #define PHYSDEVOP_pci_device_remove 26
> #define PHYSDEVOP_restore_msi_ext 27
> +/*
> + * Dom0 should use these two to announce MMIO resources assigned to
> + * MSI-X capable devices won't (prepare) or may (release) change.
> + */
> +#define PHYSDEVOP_prepare_msix 30
> +#define PHYSDEVOP_release_msix 31
> struct physdev_pci_device {
> /* IN */
> uint16_t seg;
--
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